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EIitwnits. - American Radio History

1. k i o S a b f j interference causing n voli a ia 3 50 U S 3 95 CAN BA F L Fluke meters have really been through the mill y a p pe Fluke meters can hold up to tons of pressure True story While troubleshooting carpet cutting equipment a technician accidentally leaves a Fluke 77 Meter on the belt The operator flips a switch The meter gets hammered between two bouncing 100 Ib pressure rollers They stop the ma chine remove the meter peel off the rubber holster and guess what The meter still works Now that s a case of rugged reliability that adds years to a meter s life And keeps dollars in your pocket Fact is all Fluke meters are designed built and tested to pass strict environmental mechanical and electrical standards We test every rotary knob keypad and switch to withstand several lifetimes of wear and tear We put them through tough HAST test ing for survival against drops vibration baking heat and freezing cold The result is a meter that s impressive outside And inside Fluke builds in superior calibration stability and guaranteed accuracy so you can meet Send vour amazing Fluke survival story to the address below and we ll send you a free meter case your goals for product quality If you ever need help simply call Fluke technical applica
2. 250 00 COLLINS 6518 1 RECEIVER sse 1250 00 R392 RECEIVER 5 30M Hz seems 165 00 T195 100w COMPANION XMTR TO 392 85 00 RACAL TACTICAL RzTx PRM 4090 20 80 Mhz 850 00 TRANSWORLD TW 100 PORTABLE TRANSCEIVER SYNTHESIZED AUTO TUNE 100WA TTS 2295 00 GRT 22 UHF POWER AMPLIFER ee 200 00 COLLINS 30L 1 POWER AMP TRANSWORLD TWI1590 1 Kw BROADBAND AMP w POWER SUPPLY eere ern reete 0000 eerta t 2500 00 R 1051B FOR PARTS ONLY NOT FUNCT CHECKED 100 00 COLLINS 516 F2 PWR SUPPLY USED 85 00 HARRIS RF280 HF TACTICAL TRANSCEIVER 1500 00 LEXEL MOD 75 HIGH POWER ARGON LASER 1500 00 rete trite or aug 94 MON S21Uu0J129 3 GEE Avenuer 123 Qua D Liaum CRYSTAL DISPLAYS 160 x 128 dot LCD with Built in controller T6963C 79 99 2 for 149 Mfr Toshiba TLX 101 3 EO Unit is EL back lit Dim 5 1 16 Lx 4 17 16 H The built in controller allows you to do text and graphics without adding an additional controller card Alphanumeric parallel interface 20 character x 16 line capability t CO m Bic ob 00 ke ban cmn MES C OU a mm 512 09 i TODA a an n 25 00 BE T A 2500 DE UO a 1 is deleto ix 912 00 320 Al a re S200 AOX oa eme 2 for 25 00 DOTT EE EENDU OO C UNE P P ers 5 5V power r
3. eere ecce etenim 1790 00 TEKTRONIX 520 VECTORSCOPE o 91200 00 TEKTRONIX 7104 GHz OSCILLOSCOPE 3750 00 EIP 351D 18 GHz FREQ COUNTER 950 00 GOULD RS 3800 PROGRAMABLE CHART RECORDER w MOD 5900 SIG CONDITIONER amp DC AMPS NEW 6500 00 ROHDE amp SCHWARZ SIG GENERATOR 4 484MHz 500 00 SOUND TECHNOLOGIES DIS MEAS SYSTEM 1200 00 SCHENCK DYNAMIC BALANCING MACHINE MOD CABS570 WITH BED SENSORS amp MANUAL 5 4500 00 GOULD 220 CHART RECORDER IFI MOD 404 WIDEBAND LABORATORY AMP 01 250M Hz 2 5Kw POWER OUTPUT CALL ENI MOD 310L 250KHz 110MHz 50db GAIN 765 00 ENI MOD 406L 150 KHz 250MHz 40db GA IN 350 00 TEKTRONIX 1502 TDR w CHART REC 2200 00 MARCONI MOD 2018 SYNTHESIZER 1750 00 MARCONI MOD 2019 SYNTHESIZER 1024MHz 2800 00 CIRCLE 335 ON FREE INFORMATION CARD PDR 63 PORTABLE RADIAC METER This portable radiac set is loaded with all kinds of extras featuring six ranges of sensitivity for both Gamma or Beta radation measurements The Ist scale 0 1 rad hr up to 0 5000 rad hr The unit comes supplied with headset amp bat charger Req s only 4 AA Batteries Price 149 95 PRC 25 TRANSCEIVER TACTICAL
4. 699 95 Dual Channel ng Hold Off Function High sensitivity mV div n om Sweep Tngger level lock function Built in Delay Line Z axis input CH output TV Sync 2 orobe x10 20 MHz Oscilloscope 344 95 OS 645B 40 MHz Cursor readout 734 95 OS 625B 20 MHz Cursor readout 546 95 OS 623B 20 MHz w Delayed Sweep 449 95 DC Linear Power Supplies Single Output Constant voltage and constant current mode Voltage regulation lt 0 01 Current regulation 50 296 Low ripple and noise Overload and reverse polarity protection _ Features 2 analog or digital meter PS series 2 analog or 2 digital meters PR series PS 1830 0 18V 0 3A AM 194 95 PS 1830D Digital Display 204 95 PS 1850 0 18V 0 5A Fl Uere M 204 95 PS 1850D Digital Display 229 95 PS 3225 Xv 9 35 1995 PS 3225D Digital display 219 95 PS 6010 0 60V 0 1A essen 199 95 PR 1810H ut 8V 0 10A 8329 95 PR 3060 0 30V RE 299 95 PR 6030 0 60V 0 3A 299 95 PR 6030D Digital Display WEE 10 Triple Output DC Power Supplies ee pe 1 e e J Y P Two variable 0 30VDC 0 3A outputs One fixed 5VDC 3A output Auto tracking l Auto serial and parallel operation Constant voltage and constant current mode Continuous dynamic load can be selected Features 4 analog or 2 digital dis
5. Electronics Now January 1995 Ko LM7805 V V o GND FIG 1 PSG SCHEMATIC The NCO chip is a serial input device that needs either 32 or 3 NE HSP45102 SEL L M IN V ICs MAX436 64 bits of data to generate sinewaves 32 bits are required for single frequency operation and 64 bits are required for dual frequency FSK operation interface would be more com plex hardware intensive and expensive The heart of the PSG is an HSP45102 numerically con trolled oscillator NCO The fre quency to be generated is selected from two frequency control words A single control pin selects the word that deter mines the output frequency Switching from one frequency to another occurs in one clock cycle with a six clock pulse pipeline delay from the time that the new control word is loaded until the new frequency appears at the NCOs output Twelve bit binary words se lected from the chips internal memory are fed to a Harris CA3338A digital to analog con verter DAC that generates the synthesized sinewave output IC3 CA3338A Once the sinewave has been synthesized it is level shifted to be symmetrical around zero volts and then filtered to remove the remaining components of the high frequency NCO clock frequency 32 MHz Finally the sinewave is buffered and fed to the PSG s output How does it work Refer to the upper left hand corner of the schematic Fig 1 The DATA C
6. GND 4 Test 5 GND 5 19 Not used the microcontrollers internal TABLE 3 timer to produce 31 timer inter MANUAL MODE POWER LEVELS rupts per half cycle Together o zi Power Level with the full off value those in n d Desumar terrupts provide the 32 power H levels Table 1 lists power level corresponding voltage and per centage of full on A power value 1 4 of O represents the lowest on a 6 voltage 30 represents the high 5 8 est and anything greater than 6 10 30 represents a voltage of 0 0 7 12 Eight bytes of RAM 8 14 PWRCO PWRC7 function as 9 16 control bytes each correspond 10 18 ing to a Port B output bit Each 11 20 byte stores one item of power 12 22 level data as shown in column 1 13 24 of Table 1 To see how a value in 14 26 a control byte is translated into 15 30 an output voltage follow this example Suppose that an application calls for a power level of 16 at Output 3 and a level of 30 at Output 7 In that case simply store values of 16 and 30 in con trol bytes PWRC3 and PWRC7 respectively The outputs will immediately and simulta neously reflect these levels Note that although the desired volt ages were specified in decimal form you must store the corre sponding hexadecimal value in the output control bvte A hole was left in the micro controller s EPROM addresses S80 S5FF for application pro grams The five demonstration routines discussed earlier oc cupy those addr
7. VISUAL COMI MUNICATIONS INC E 4 PIONEER BOARD 800 Go CABLE TECH SUPP 71 8 229 2358 CIRCLE 183 ON FREE INFORMATION CARD AUDIO UPDATE at e js ick or service with a smile s with many other boys it all started for me when was about 13 years old Not sex electronics Hours of immersion in The Boy Electrician Everybody s Radio Manual and Radiocraft ulti mately led me to apply for an after school apprenticeship at a local ra dio repair shop l m sure that got the job as a result of the World War II home front manpower shortage rather than any precocious elec tronic know how But in any case 50 odd years later still remember an incident from my first day of work was told to check out a five tube table model radio It seemed O K for the first few minutes after warm up but then the output began to distort My boss who was working on something else glanced at the radio and said Change the leaky 0 01 condenser between the plate of the 12SQ7 and grid of the 5OL6 was stunned How did he know what needed changing or even what tubes were in the set vowed that one day too would be the proud possessor of such arcane knowledge And by the time joined the Army in 1946 was so proficient in the electronic mysteries that was sent to White Sands Proving Grounds to be an electronics tech nician during the start up of the U S space program but that s another s
8. You know us for our oscilloscopes Considering we are the widely accepted market leader it s not surprising B Now we ve expa ded T our scopes It s all compatible fully integrated and best of all simple TEKBENCH to use And all made available to you in a compre hensive affordable port folio we call TekBench E Come try one out when you next need something for your bench We believe we ll be well within your scope For more information or the name of the Authorized TekBench Distributor nearest you call 1 800 426 2200 When prompted press 3 and request ext 335 A E 2c opyright 1984 Tektronix Inc A ht sesapred ix and WELCHES aire jemarks af Tektro J ud Eger g reir a lo P x 1 om dd Hind id Ld Electronics Now January 1995 Troubleshooting and Repairing AUDIO EQUIPMENT 4112H 29 95 Hardcover 1 et STAG GEBILISCS 3621H XX 39 95 Hardcover Counts as 2 zi TRODUCTIUN TO PRAGTICAL ELECTRICAL ANTENNA ENGINEERING WATDRPOK SECOND EDITION T LSscond dition T e t P 0110646 XX 37 95 4244P 9 95 011322P XZX 49 16 037603 XX 5950 0111049 XX 49 95 4334H 29 95 Counts as 2 Hardcover Counts as 2 Counts as 2 Hardcsever Counts as 2 Hardcover Hardcover m et A a ssp EENMS P wo jf END no D TROUBLESHOOTING DD f eao eee
9. or X X The only number that affects how many of pulses appear at the MULTIPLIED RATE Output is the number that s preloaded on the data inputs Multiplying two numbers is done by loading one number at the data in puts and letting the rate multiplier do successive addition a number of times equal to the second number The answer is obtained by counting the total number of pulses at the MULTIPLIED RATE Output See Fig 3 Since you re dealing with eight bits of data from the spark counter and the 4089 has only four bits worth of data inputs you ll have to cascade two rate multipliers IC16 and IC17 The only other IC you need is a counter that will stop the rate multipliers after they ve made 20 passes of successive addition This part of the circuit is made up of the 4040 IC18 and the 4081 quad AND gate IC19 The 4040 counts the number cf 4089 BASE RATE Output pulses and when the count reaches 20 AND gate IC19 a detects the count and puts a high on the 40895 inhibit inputs to stop pulses from appear ing at the MULTIPLIED RATE Output One control signal is still missinc however The AND gate stops the rate multipliers from working after multiplying the spark count by 20 but you need some way to restart the multipliers when a new count appears at the outputs of the spark counter This problem is solved by the 40405 RESET pin pin 11 Every time a new spark count is ready to be multiplied the two hertz clock
10. 25VI 0A Video amp Audio Test E ccessories Call for a F LFG 1310 LPS 151 Triple Output LPS 152 Tripie Output Full line of Oscillosco Supplies Probes and A 6V 3A eg TV Sync 525 00 TV Syne Sale Call for latest sale price 100 MHz 2 Ch Dlyd Swp TV Sync FREQUENCY COUNTERS TOR SPET aries 395 00 5595 00 6975 00 1 095 00 555 00 645 00 rent Power Um ne Catalog Eu We buy Seplus Electronic Equipment Fax us your list Pre Owned Oscilloscope Specials Tektronix 465 Tektronix 465B 100 MHz Tektronix 475 200 MHz 100 MHz 499 00 599 00 679 00 Fully refurbished and calibrated to original specifications TOLL FREE 1 800 99 METER For more GREAT VALUES Call Write or FAX P O Box 708 Medford MA 02155 FAX 617 665 0780 CIRCLE 130 ON FREE INFORMATION CARD Serving the public since 19871 GR P CAMI BEER PD ELECTRONICS 201 E Southern 205 Tempe AZ 85282 Smallest FM transmitter anywhere Tunes 88 108 MHz Powerful 2 stage audio amplifier sa Sensitive picks up Sounds at the level of a whisper Up to 1 miie range ve SUPER MINIATURE FM TRANSMITTER Worlds smallest FM transmitter Use with any FM broadcast receiver Easy to assembie all chip SMT parts are ee to the Circuit board and listen to the sounds inside your home Two digit Touch Tone code for secure operation
11. CIRCLE 135 ON FREE INFORMATION CARD on line help full sceen editor Anvone im Easy to use software MODEL 4000 KIT 79 95 The 4000 KIT comes with all the electronic components and our Cad designed PC board We provide schematic parts list wiring diagram tutorial and FREE in house support MODEL 4000A Enc 44 95 The 4000A Enclosure Package will provide the hobbyist who has our 4000 Kit a custom enclosure AC adaptor and finish accessories to professionally enclose their kit EIU Ses a eL oil eek dd a we In Canada 813 751 3262 1 800 pilvine 999 theft of cable service will be denied assistance Device Programmers PB 10 Internal Ca Fast Programming EMP 20 27C010A 23 seconds 28020 34 seconds 270040 95 seconds eee 2 apaelfas 1 1 Year Warranty Technical Support by phone e 30 day Money Back Guarantee e FREE software upgrades available via BBS e Demo SW via BBS EM20DEMO EXE PB10DEMO EXE e E e proms 2716 8 megabit 16 bit 27210 27240 27C400 amp 27C800 e Flash 28F256 28F020 29C256 29C010 EMP 20 only e Micros 8741A 42A 42AH 48 49 48H 49H 55 87051 87C51FX 87C751 752 bia ysi qii GAL PLD from NS Lattice AMD 16V8 20V8 22V10 EMP 20 only EMP 20 FOR MORE INFORMATION CALL NEEDHAM S ELECTRONICS INC 916 924 8037 Ooo BBS 916 972 8042 FAX 916 972 9960 CIRCLE 257 ON FREE INFORMATION CARD MON S2100412913 5661 Menuer
12. Connect the other terminal of S1 to the other side of the fan and to one terminal of S2 Con nect power indicator NE 1 across the fan terminals so it will indi cate when power is applied to the fan and to S2 Standby switch S2 allows power to the transformer to be shut off while still allowing the fan to work Wire indicator NE2 across S2 so that it illuminates when S2 is open or when the unit is in the standby mode Next connect S2 to the other side of the transformer Con nect the neutral white wire from the line cord to one side of the fan and also connect it to one terminal on the input side of the transformer Connect both output leads of the transformer to the AC recep tacle SO1 Next connect the out put power indicator NE3 across the receptacle As a last impor tant step run a ground connec tion from the line cord the green wire to the base of the transformer and to the fan If the transformer has not been grounded to the chassis be sure to do so now with a sepa rate wire Testing Before closing up the case plug an appliance such as a cof fee maker a lamp or another appliance that draws about 500 watts into the isolation trans former outlet and turn on the power Run the transformer with the load turned on for ap proximately 30 minutes while checking it every five minutes or so for excess heat The prototype was tested with an 800 watt coffee maker and the transformer ran warm but not h
13. Mm ana nan ate LL uc Bat v eg i ia A 1 r3 sif E 8 i aa NIDA ELECTRONIC TRAINER For those of you with limited funds this system provides you with the most essential instruments in one system It incorporates the following 10MHz oscilloscope Autoranging DVM Function generator 3 variable dc power supplys variable ac power source Precision decade resistance Speaker and 2 analog meters This unit comes complete with a number of electronic experiments assembled on easy to use plug in cards Price 365 00 8 DAY AIRCRAFT CLOCK 1 7 8 dial Great collectors item for the ham shack fifties vintage funct chkd TEKTRONIX 465B Proof is in the pudding when it comes to this instrument s track record There s no doubt that popularity speaks many languages when speaking of the 465B This excellent instrument continues the tradition of the standard 465 oscilloscope by adding useful features such as CH 1 CH 2 sum or difference trigger view in any combination alternate sweep and trace selection versatility Many technicians dream of owning a quality 100 MHz oscilloscope but funding rairly permits Fortunately we were recently able to aquire a limited supply of 465B s in nearly new condition Our LOW PRICES will likely permit you to own one of the best scopes anywhere in the country If your needs are current and action swift you too will be a member of a gr
14. TELEPHONE SNOOP 3 The tatest in home or office security Call home Irom any where enter a two digit security code and hear the sounds in your home Automatically turns on without ringing the phone verifies code then activates for ane and a hall minutes XPS CASE KIT 1395 XPS1000 C IT Digita voice changing male to female female to male aduit to child chtid to adult Anonymity on any call Button for normal operation 16 levels of voice masking VOICE CHANGING TELEPHONE older and tougher when you want to Not a kit Fuily assembled Single phone operation only 1 Digital voice changing male to fe WE ACCEPT VISA MC MO COD Mame SHIPPING amp HANDLING EXTRA SATISFACTION GUARANTEED 5140 eSmallest Phone transmitter anywhere e Tunes 88 108 MHz No batteries required powered by phone tine eUp to 1 4 mile range Attach to phone line anywhere in house even inside phone SUPER MINIATURE PHONE TRANSMITTER Worlds smallest FM phone transmitter Use with any FM broadcast receiver Easy to assembie all chip com ponents are pre assembled to the circuit board XSP250 E 2 Kit Transmits a continuous beeping tone A Adjustable from 88 to 108 MHz Up to 1 mile range Works with any FMS broadcast receiver i TRACKING TRANSMITTER Only 0 7 by 2 4 inches the XTR100 operates at voltages of 3 to 18 Volts and is ideal for use in locating lost model rockets
15. 12 000 ohms 1 watt R2 10 000 ohms R3 R7 R11 R15 R19 R23 R27 R31 220 ohms R4 R6 R8 R10 R12 R14 R16 R18 R20 R22 R24 R26 R28 R30 R32 R34 1000 ohms R5 R9 R13 R17 R21 R25 R29 R33 180 ohms RN1 4700 ohms x 9 resistor net work common terminal RN2 4700 ohms x 5 resistor net work common terminal Capacitors C1 1000 pF 16V radial electrolytic C2 1 uF 16V tantalum C3 10 pF 16V radial electrolytic C4 C15 0 1 uF monolithic C5 27 pF ceramic C6 1 pF 16V radial electrolytic C7 C14 0 22 uF 400V poly film Semiconductors IC1 MC68705P3 microcontroller 1C2 H11AA1 AC optocoupler IC3 MC7805CT 5 volt regulator IC4 IC11 MCP3011 Triac driver Q1 Q8 2N3906 NPN transistor TR1 TR8 Q2004L3 Triac 200V 4A isolated tab BR1 Bridge rectifier 50V 1A DIP Other components J1 3 terminal AC power connector J2 9 terminal AC power con nector P1 P4 3 pin single row 0 1 inch male header P5 14 pin single row 0 1 inch male header P6 4 pin single row 0 1 inch male header 1 8 position DIP switch S2 4 position DIP switch S3 SPST momentary pushbutton switch T1 Transformer 120V primary dual 6 3V secondaries Digi key T101 ND or equiv XTAL1 3 579545 MHz crystal HC 18 Miscellaneous Shorting jumpers for P1 P4 heat sink for TRiI TR8 PC board solder wire etc Note The following items are available from Richar
16. 20 00 LLISTIK Kit of Both Transmitter and Receiver 199 50 LLIST20 Assemble with Laser Gun Site 299 50 3mw Visible Red Pocket Laser Utilizes our touch power control VRL3KM Kit Plans 7 4 50 Electronic 2 lt Hypnotism Puts subjects under control using highly effective electronic Stimuli Intended for parties and entertainment but must be used with caution Includes valuable text book reference and plans EH2 Plans and Text Book ignem g Easy to Install Fata 4 Tube Kit l for Cars Trucks Vans a Available in Pink Purple Blue or Green lf please specify color when ordering RG4K Specity Color 129 50 License Frame Kit Flash To Music Option for above m Color M RWU aue 2 aes 3 Mi FM Wireless Microphone Subminiature Crystal clear ultra sensitive pickup transmits voices and sounds to FM radio Excellent for security monitoring of children or invalids Become the neighborhood disk jockey FMV1 Plans 7 00 FMV1K Kit and Plans 39 50 Telephone Transmitter 3 Mi Automatically transmits both sides of a teiephone conversation to an FM radio Tunable Frequency Undetectable on Phone Easy to Build and Use Up fo 3 Mile Range Only transmits during phone use VWPM7 Plans 7 00 VWPM7K KitPlans 1 e 39 50 CATALOG Order by Mail With many or by 24 Hour more items Orders Only Phone Free with Order or sen
17. 75 74MC240 69 4069 3 Tum 15 EMBBT gt 49 74995 75 WLSI78 99 74HC241 69 4070 35 TL081 VI NES70 2 99 MESIS L1 38 1405379 99 TANCMZ B9 4071 3 iE cru 65 E571 2 09 74L5107 45 74LS385 209 74HC243 89 4072 45 TLOB 1 09 NE590 2 69 74LS109 A8 14L 5386 5 74HC244 3914073 30 TLORA t 09 NE592 A5 74L8112 LAE T4LS390 B9 74HC24S 79 4075 35 LMT5OK 4 95 NE602 1 95 74 8113 fo TALS393 19 74HC251 e 59 4076 EL Cdi 69 LM207 E S0 M X663 3 69 74L81 14 s 45 LS395 R9 748C253 59 HOTT 35 M208 ER 2 3 A SO MAX666 ae 3 89 74 8122 57 14LS396 59 T4HC257 59 4078 40 XB215 150 M X8580 349 MASISS 89 MLS390 69 74HC25P 69 4081 30 NUN ll 1 30 MAXBO 5 99 74LS124 H 269 BLS424 4 00 74HC259 z 89 4082 Er Ew A MAX232 2 79 MAX691 5 99 74LS125 A5 1435447 1 19 74HC273 B9 4085 wwe A5 MAX233 6 50 MAX692 650 74 81 6 A5 TAL S448 1 09 741 C280 gt 921 4086 79 MAX238 650 MAX694 6 50 1 8126 AS TALSAGS 1 09 74HC299 109 4089 1 19 MAX236 6 50 MAXEOS 6 50 74L5133 59 14L8490 1 09 74H C367 69 4093 e A9 LM301H 89 LM709 _ a ind BO PALEIS AQ LS534 129 74NC3GP 69 4094 1 08 yor 49 T10 BO 74L 137 59 T4LS540 99
18. 8 Function AC DC voltage AC DC current resistance Built in C meter diode test and audible continuity check z Ph voie 1000V and 20A range 0 596 basic accuracy DM 8040 3 Digits True RMS Measures ACV to SO KkHz 339 95 DM 8055 5 Digits ssssssss 649 95 0 006 basic accura n V 1m 1nA resolution dBm measurement l Auto range relative mode Max Min DM 8055G 5 Digits GPIB 889 95 Model DM 392 3 digits 109 95 Auto Manual ranging 38 ranges 42 Segment analog bar iic Data Hol Max m mory elative mode Auto power off Overload protection Audible continuity check diode test Capacitance pF 40uF Frequency 0 lHiz IRAHz 20 Tip Rea ange Double high energy fused els A gh energy 1 0 3 DC V accura AC True RMS DM 394 only DM 351 3 Digits w Continuity Auto Offf 54 95 DM 352 3 Digits Cap Freq 20 Amp 79 95 DM 353 3 Digits Cap Freq Temp hFE 84 95 DM 391 3 Digits Auto Cap Freq Min Max 99 95 Bra 3 Digits Hold Min Max 20Amp 109 95 3 Digits Peak Logic hFE Freg 119 95 DM 394 3 Digits TRMS Same as DM 392 129 95 MON S921UOJI29 3 G66 Asenuer 117 Electronics Now January 1995 A Incredible miniature cylinders Mir i We a P BIG x izre se a v ame
19. BT TEST BIT BT OF BYTE BY SET DATA fo TOGGLE CLOCK LINE DECREMENT BIT DONE SET DATA TOO DECREMENT BY YES FIG 2 PARTIAL SUBROUTINE FLOWCHART The 32 bit NCO frequency code must be read into the board bit by bit specify some output frequency Enter that frequency with an in put statement assuming a pro gram written in QBASIC and then convert the frequency to the format that the NCO wants to see by using the following equation N Integer Portion fourt x 232 fo x where N NCO code number four The output frequency and fc 32 MHz The integer portion of the equation means that only the digits to the left of the decimal point are used for N Using Basic s long integer suffix en sures that the NCO frequency code number N will be stored in a 32 bit format An amp fol lowing a variable declares it a long integer which happens to be 32 bits long The program for the PSG shown in Listing 1 is written in QBASIC version 4 5 The pro gram has a few nice features such as parallel port selection LPT1 LPT2 or LPT3 a multi color display error messages and user prompts The program has been tested on both a 386 based IBM compatible PC and an old monochrome 8088 based PC running at 4 77 mega hertz and it performs equally well on both machines This article will not include a line by line analysis of the pro gram However consider the sub load
20. ETT1 5 75 A slice of history This early l electronics catalog was issued in 1918 It consists of 176 pages that document the early history of electricity radio and electronics It was the bible of the electrical experimenter of the period Take a look at history and see how far we have come And by the way i Transmission Lines Digital Logic ITE E don t try to order any of the T Power Supplies Then there s an WU es merchandise shown it s unlikely i B appendix of Conversion Factors xi Y that it will be available And if it Mathematical Formulae and is the prices will be many times more higher g 2 n boc SHIPPING CHARGES IN z cea ie TECHNOLOGY TODAY INC USA AND CANADA SORRY No orders accepted Number of books ordered S P O Box 240 Massapequa Park NY 11762 0240 outside of USA amp Canada 7 0 01 to 5 00 1 50 Total price of merchandise i Name 5 01 to 10 00 2 50 Shipping see chart yar l i a RS OE pe M M 290 3 90 SUME qoe ec XX 1I ES E Address 20 01 to 30 00 4 50 Sales Tax NYS only 1 City State Zip mu a pie E Total Enclosed C EN195 s5001andabove 8 00 All payments must be in U S funds l 97 EIC a eM NNI n unm un Rm ad an m RN l Electronics Now January 1995 1 b ik LH e e 4 e 2 JEA f i tf i Hitt i 3 HB a saz 166v ot for sale in JSA
21. MON S3100J129 3 66 Menuer 05 CIRCLE 236 ON FREE INFORMATION CARD Leatherman Tool The Leatherman toot is an extremely ver satile and durable compact toolchest you can hold in your hand contains 12 use ful tools in one Needlenose pliers regu lar pliers awl Phillips screwdriver three internat onal Inc slotted screwdrivers can and bottle opener wire cutters file knife and 8 inch ruler Made of only the highest quality 10096 stainless steel Includes sturdy leather sheath 25 year manufacturer warranty Net weight 5 oz EN 360 990 n 4 1 2 Pioneer Full Range Paper cone with treated cloth surround Open back and stamped bas Fiuke Model 73 The Model 73 features a high resolution 3200 count display and 31 segment bar graph Reads DC to 1000V and AC to 750V with 0 4 basic DC accu racy Fused 10A current range DC and AC current with 1 5 basic DC FEL LIKES accuracy Resistance ranges 320 ohm to 32M ohms In cludes 9V battery test leads and manual Net weight 1 Ib ket Perfect for bookshelf type To 8s speakers and car stereo installations PIONEER Power handling 20 watts RMS 30 watts max Voice coil diameter 1 Fish Tape Reel 50 ft fish tape inch impedance 8 ohms Fre Ee Meas dait quency response 70 15000 Hz Perfect for Magnet weight 9 3 ozs Fs 70 Hz SPL 90 dB 1W 1m Vas 31 Qrs 35 Qes 47 Qws 1 4 XuaAx 043
22. Mesum R CIRCLE 343 ON FREE INFORMATION CARD Davis describes in detail many business pos sibilities and the require ments for entry into them He balances his discussion by listing potential road blocks but he explains how to avoid them A sepa rate appendix lists and de scribes 75 more home based business ventures that depend on the person al computer Build Your Own Home The ater by Robert Wolenik Sams Publishing Div of Prentice Hall Computer Pub lishing 201 West 103 Street indianapolis IN 46290 Phone 317 581 3500 16 95 This book explains how to assemble a complete home theater from stan dard off the shelf audio and video components Wolenik describes the many options available for CIRCLE 344 ON FREE INFORMATION CARD building a home theater in cluding stereo broadcast and cable television VCR laserdisc player satellite receiving antenna sur round sound speakers and camcorders The author goes into technical detail in explain ing the differences be tween the many products in each of the entertain ment product categories For example you ll learn what some of the important differences are between rear projection front proj ection and direct view television receivers He also explains the im portance of color clarity and resolution for pleasur able viewing and the dif ference between Dolby Surround and Dolby Pro Logic You ll even learn how to place your sp
23. This is a completed commercial monocular hond held night viewer that emplous an imoge intensifier tube The viewer is of a USSR military standard and will produce useful images in very low ambient light Has adjustable low light objective lens adjustable eyepiece and is supplied with a carry cose ON SPECIAL 220 CCD CAMERA Monochrome CCD Camera which is totally assempled on a small PCB ond includes an Auto Iris lens 9 12V DC operation It can work with illumination of as lite os 0 1 Lux and is IR responsive Can be used in total dorkness with Infra Red illumination A suitable illuminator is our HIGH POWER LED IR ILLUMINATOR kit Overall dimensions of camera are 24 x 46 x 70mm and it weighs less than 40 grams Can be connected to any standard monitor or the video input on a Video cassette recorder EIA US NTSC compatible 145 MINIATURE FM TRANSMITTER Pa Not a kit but a very small ready made self contained FM transmitter enclosed in a small black metal case It is powered by a single small 5V silver oxide battery and has an inbuilt electret microphone SPECIFICATIONS Tuning range 88 108MHz Antenna Wire antenna attached Microphone Electret condenser Battery One 1 5V silver oxide R44 G13 Battery life 60 hours Weight 15g Dimensions 1 3 x 0 9 x 0 4 25 MISCELLANEOUS ITEMS COMPONENTS AND KITS SINGLE CHANNEL UHF REMOTE CONTROL KI
24. graphic logic based de bugging controls to be em bedded in a user program under development The DDT routines generate re mote X11 graphic displays that permit viewing pro gram data results on a SPARC Unix workstation control debugging flow and analyze massive data ar rays into a clear graphic for mat CIRCLE 23 ON FREE INFORMATION CARD The program was de veloped as a quick analysis tool for general data pro cessing signal processing data acquisition and other scientific and engineering data processing DDT al lows the developer to in sert debug routine calls into C and FORTRAN code at key points where the data can be viewed or checked for complete al gorithm verification One program call gener ates one graph The con trols allow the program results to be stepped or viewed after a number of computations without in tervention DDT is available for SPARC Solaris com puters Motorola 167 pro cessors and various CSPI Supercards DDT has a price of 499 per library CST Images 5055 Viewridge Ave B San Diego CA 92123 Phone 619 277 7833 Fax 619 576 9859 RED LIGHT VISIBLE LASER DIODE The TOLD9521 red light emitting visible laser diode VLD from Toshiba America draws 75 milliam peres while emitting at a wavelength of 635 nanometers It produces 3 milliwatts of output power when operated in the rated ambient temperature range ol 10 C 10 50 meaane Daran i P maaa
25. limiting resistor R1 and a bias resistor R2 The power con troller generates variable power levels with phase control tech niques When using a Triac to control a load the power deliv ered can be varied by triggering the Triac after the start of an AC half cycle For example by triggering the Triac shortly after the start of a half cycle the load will receive almost full power Triggering in the middle of a half cycle will supply the load with half power and triggering close to the end of a half cycle will result in the load receiving little power In this project the controller is synchronized to AC power line zero crossings which occur at a rate of 120 times per second The microprocessor internal timer then divides the interval between crossings into 32 steps thus delivering gradually increasing amounts of power to the load The output of the optocoupler is a negative going pulse that drives the microcontroller s in terrupt input directly at a rate of 120 hertz Each time Cl re ceives an interrupt it recalcu lates the time to generate Triac trigger pulses on Port B of IC1 Each bit of Port B is con nected to a Triac control circuit since they re all identical only Port 7 will be described in de tail Port B7 of IC1 drives tran sistor Q1 via resistor R4 Q1 is required because the 68705 can t sink enough current to trigger Triac driver IC4 directly When it s time to turn on Triac TRI the m
26. 14433 5 95 7442 1 39 LSSI w Ao MLS323 159 4HC161 59 2047 70 14451 150 LFA44 189 ES JA 74LS324 2 09 74HC163 59 4048 39114490 495 TLA89 59 TALSSS 34 4LS327 1 09 TAHCIGA 59 4049 90 14495 349 TL494 189 74LS63 r WALSHE 109 74HC165 69 4050 35 14497 95 TL496 159 7ALS73 A5 14LS352 1 09 74HC166 59 4051 75 14499 399 TL497 209 PAST l l Da ML9353 99 MARCITA 59 4052 Linear NES3T 1 99 JALSTS aL 3g 4LS363 229 MHCT 5 59 4053 9 sepopos 249 LM 559 45 74LS78 ee 4LS364 109 74AC191 B9 4055 99 imase 1100 LM555C 69 741578 9 ipm 50 ALS365 A5 74HC192 S 89 4056 b uoce 63 M10 vs 2 39 XRL555 00 74L e 59 ALSJE A5 74HC193 e 79 059 AAA bendi 2 99 TLOS1 j 1 1 SE555 25 TUE lll Eg MLS367 AS T4HCIO4 79 4060 amp nog 1 13 LMSS6 50 PARR 1111 38 4LS368 45 TARCIOS 99 4063 109 toga 1 13 LM5S8 79 74 500 55 4LS373 e J5 74HC221 5914065 35 TLO65 Tu 90 564 1 79 74LS91 69 14 5374 15 748C237 7914067 1 99 75 LM565 1 59 TALS92 g 2LS375 99 74HC238 B9 406B At 1 73 LUSG 129 PAL SOS LL 49 14L9377
27. 4630 Beloit Drive Suite 20 Sacramento CA 95838 Monday Friday 8 am 5 pm PST Electronics Now January 1995 Digital Storage Oscilloscope For 169 95 And much much more O Scope I turns PC ATs into DSO spectrum analyzer frequency counter DVM DC 50KHz Sinewave Sweep Actual O Scope Signal Traces j PE k a 3 v W y Y Wry V un Spectrum For Orders and Inquiries Call 1 800 980 9806 For Technical Assistance 1 713 777 0401 Allison Technology Corporation 8343 Carvel Houston TX 77036 FAX and BBS 1 713 777 4746 Learn MICROCONTROLLERS EMBEDDED SYSTEMS and PROGRAMMING with the AES 10 S The AES 10 a complete leaming system a complete embedded control system Extensive manuals guide you eae your 8051 development project Assembly BASIC and C programming All hardware details complete schematics Learn to program the LCD keypad digital and analog I Os for your applications 80032 Computer Microcontrotler board with e 32K ROM 32K RAM 2 by 16 Liquid Crystal Display 4 by 5 Keypad Digital A D D A and PWM I O Built in Logic Probe Power supply can also be battery operated Extended AES BASIC and AES Monitor in ROM RS 232 cable to connect to PC for programming 8051 52 DOS Cross Assembler Program disks with well documented examples User s Manual Language Manual and Textbook AES 20 a smaller board without Keypad and LCD AES 20 245 Free Bro
28. Eam as mu aana n a pera M Zn Am a Aaa y Pate d iua Feet em CIRCLE 24 ON FREE INFORMATION CARD The TOLD9521 is seven times brighter than Toshiba s 670 nanometer VLD Its brighter beam can be seen more easily by the human eye at safe power levels The TOLD9521 is in tended as a light source in instruments for leveling and aligning ceilings bar code scanners laser printers and communica tions systems Visible red light emitting diodes are smaller have lower power requirements and higher efficiency than helium neon HeNe gas lasers that emit in the same visible region They also have a higher response to input currents Toshiba s visible laser diodes are made from crystals con taining indium gallium alu minum and phosphorous InGaAIP TOLD9521 red light emitting VLDs are priced at 100 each Toshiba America Electronic Components Inc 9775 Toledo Way Irvine CA 92718 Phone 714 455 2000 MINIATURE SURFACE MOUNT TRANSFORMER The miniature TC4 1W RF transformer from Mini Cir cuits has a bandwidth of 3 E es aet P CIRCLE 25 ON FREE INFORMATION CARD to 800 MHz and features DC isolation between its primary to secondary wind ings Recommended for impedance matching and land mobile radio it mea sures only 0 16 x 0 16 X 0 16 inch The surface mountable transformer was designed for circuit board placement with pick and place ma chines The transformers are ava
29. Finally in des peration I exchanged the cable box again and bought a brand new remote control MON S21U0J129I3 GEG Menuer Electronics Now January 1995 LIGHTS OF AMERICA s Model 2022 fits around the shade supporting harp of most See Se table lamps It interfered with the authors s cable box electronics Everything worked well dur ing the day but at night neither my new universal remote con trol nor cable box remote would work I then concluded that the cause might be noise on the ca ble or perhaps some energy source interfering with my re mote s signal Although I felt foolish doing it I turned off all thelights in my houseand with my remote switched a number of channels Had the problem been solved Then I turned the lights back on oneata t me and eventually narrowed down the offending source to new energy saving flu orescent tubes that I had in stalled months earlier These bulbs were interfering with my remote control but the stan dard fluorescent tubes in my kitchen lighting fixture had no effect on it I ruled out power consump tion as a cause the energy sav ing fluorescent tubes were rated for 30 watts but the kitchen fix ture contained four 40 watt tubes It seemed that the fluo rescent bulbs were producing GENERAL ELECTRIC S Model 1302 did not interrupt any of the author s entertainment es an infrared signal that jammed my cable box and on occasion simulated
30. IS A PC and a 30 PRINT BLUE EARTH RESEARCH Terminal Program 40 PRINT WACTUAL RH FREQ 0 50 PRINT SETPOINT RH S Initialize 1 second interrupt Display sign on message Display actual sensor frequency Display desired setpoint value Or Xplor Starter Package 60 CALL 8140 LIBRARY FUNC Get keypad input 70 IF DBY 27 6 THEN SSS 1 Decrement setpoint if down arrow No Other 80 IF DBY 2727 THEN S S 1 Increment setpoint if up arrow Proarammin 100 IF FREQ 0 lt S THEN BIT 180 1 If actual setpoint then relay on g g J10 IF FREQ 0 gt S THEN BIT 180 0 If actual gt setpoint then relay off Equipment 120 GOTO 40 Loop back to repeat program Required 200 PRINT NTIME DBY51 This 1 second interrupt routine 210 PRINT DBY 50 DBY 49 IRET refreshes LCD with current time CIRCLE 220 ON FREE INFORMATION CARD eXplore the Opportunities i Xplor PDCs MORE CHOICES FOR GREATER FLEXIBILITY Xplor 32 355 995 Same features as the 32c less case and terminal block Board Is only 2 15 x 22 Xplor 32a 79 95 with 11 channel 10 bit A D converter Xplor 32d 579 95 with 24 extra digital I O lines Complete Packages from 99 95 All Xplor PDCs are available in starter packages that include the Xplor board screw terminal blocks RS 232 cable 9V power supply users manual application notes and MSDOS format disk The disk includes sample BASIC programs library so
31. Lancaster HH Collecting Oid Audio Klein AUD Colorimeter Low Cost Schnabie Alessandro amp Qrr C Commercial Editor TV Hurst C May 75 Feb 33 Jul 67 Mar 52 Apr 75 Jul 71 Nov 47 Nov 14 Feb 59 May 86 Jun 10 Apr 85 Jan 80 Sep 75 Apr 96 May 45 Aug 31 Electronics Volume 65 Communications Standards Modem Bigelow Sep 35 Completing the Tachometer Spark Counter Section G Grossblatt DB Nov 86 COMPUTER SEE ALSO COMPUTER CONNECTIONS Benchmarks Byers Jun 63 Build This PC I O Breadboard Dage C VO Boards Lancaster HH L Com DXB65 Ethernet Cable Tester ER PC Based RF Signal Generator Jun 51 Jul 55 Aug 59 Sep 75 Jun 19 Doberstein C Mar 35 Apr 61 Power Line Modem for Home Contro Keefe C Mar 57 Solid State Disk Drive Hatten C Apr 49 X Y Plotter Brown C May 57 COMPUTER CONNECTIONS Holtzman D Jan 88 Feb 88 Mar p od T Aug 12 Apr 98 May 90 Jun 27 Jul 86 LET Sep 16 das 16 LET Nov 8 Sep 87 Oct 89 Nov 90 Dec 28 1993 in Review Apr 98 And Then There Were None Jul 86 LET Sep 16 David and Goliath or Bills Bad Awful Day Jun 27 Develop Cool Products Get Rich Quick Sep 87 Falling Prices are not Necessarily a Good Thing Jan 88 General Magic Has Something Up Its Sleeve May 90 National Information Infrastructure The Feb 88 Problem with Sottware Documentation The Dec 28 Suites for the Sweet Mar 91 LET Aug 12 Vision of the Future A Aug 16 LET Nov 8 What
32. NE564 1 75 2N2222A 32 LM733N 65 2N3055 69 LM741 40 2N3553 2 75 UA7805 49 2N3563 40 UA7812 49 2N3866 1 05 UA7912 25 2N3904 10 LM317T 79 2N3906 10 CA3126E 1 60 2N4401 15 MPF102 49 CD22402E 9 95 With Complete Instructions NEW SOFTWARE FOR MAKING PRINTED CIRCUIT BOARDS ON ANY MS DOS IBM COMPATIBLE PC Make single or double sided PC Board artwork up to 30 x 30 Print your artwork on any PostScript Laser Printer e Produces a 1X positive ready to use with precoated board No other artwork required Produce industry standard solder mask and component layout for silkscreen art The NEW PCDATAK software lets you create PC boards ranging trom prototypes 10 hobby projects and on a par with the Pro s You may do the complete printed circun board layout artwork on your own MAKE CIRCUIT BOARDS THE NEW EASY WAY WITH TEC 200 FILM JUST 3 EASY STEPS Copy Circuit pattern on TEC 200 film PC at afractlon of the cost of other programs Print the layout on any using any plain PostScript compatible printer ether on regular paper to be photo paper copier graphed for a positive or negative or on Clear film to be used directly tron film on to as a positive with other Datak products copper clad board Peel off film and etch Convenient 8 1 2 x 11 size widths iet you do any Circuit that you can imagine 5 SHEETS 6 25 10 SHEETS 10 75 20 SHE
33. Net weight 2 Ibs Manufacturer model number A11EC80 02F eDimensions A 4 1 2 B 4 1 8 C most tool boxes 2 3 8 D 3 1 8 E 1 80 EN 290 010 109 995 EN 360 420 Mini Weatherproof Speaker System These mini weatherproof speaker cabinets are made from high impact polypropylene which is completely weather sealed making these perfect for indoor or outdoor use These great sounding mini speakers feature a 5 polypropylene cone woofer and a mylar dome tweeter Ideal for use as extension speakers or for surround sound Small size blends easily into any decor Frequency response 130 20 000 Hz 8 ohm impedance 30 watts RMS 60 watts maximum power handling capability Mounting brackets included Dimensions 8 H x 5 1 2 W x 4 1 2 D Net weight 10 Ibs EN 310 020 Black EN 310 025 White Idler Tire Kit Make VCR tire repairs quickly by having the tire you need in stock when you need it This comprehensive kit con tains 180 of the most commonly used tires in an easy to use case and a cross reference with 80 manufacturer assembly numbers crossing to over 200 VCR model numbers A 400 00 retail value Net weight 1 1 2 Ibs EN 400 900 39 Variable Output Bench Top Power Supplies Heavy duty power supplies suitable for lab work Provides excellent regulation and low ripple characteristics Features variable voltage control variable current control with Hi Lo ranges
34. The open taps from where the informa tion pours out may be from FAXS com puter communications telephone calls and everyday business meetings and lunchtime encounters Businessmen need counselling on how to eliminate this in formation drain Basic telephone use cou pled with the users understanding that someone may be listening or recording vital data and information greatly reduces the opportunity for others to purloin meaningful information CLAGGK INC P O Box 4099 Farmingdale NY 11735 m a E ee cee ae ess Please rush my copy of the Countersurveillance Techniques Video VHS Cassette for a total cost of 53 95 each which includes 4 00 postage and handling No of Cassettes ordered Amount of payment Sales tax N Y S only Bill my O VISA O MasterCard Card No Expire Date Signature Name Address City _ All payments in U S A funds Canadians add 4 00 per VHS cassette No forcign orders State ZIP ountersurveillance The professional discussions seen on the TV screen tn your home reveals how to detect and disable wiretaps midget radio frequency transmitters and other bugs plus when to use disinformation to confuse the unwanted listener and the technique of voice scrambling telephone communications In fact do you know how to look for a bug where to look for a bug and what to do when you find it Bugs of a very small size are easy to build and they can be place
35. The test results indicated that the contact resistance of the Cool Amp plated bus connection was slightly lower than that of the electro plated bus connection and much lower than that of the bare copper bus connection The final temperature at temperature equilibrium of the bus connection employing Coo Amp was slight ly lower than that of the electro plated bus connection and the bare Copper bus connection Cool Amp How it works Applies on the job Application is simple Yet Cool Amp adheres permanently As tests show it is better than electroplating Minimizes overheating and power loss by silver plating high amperage connections e Saves time reduces mainte nance Cool Amp is so simple to apply on the job It assures maxi mum conductivity for copper brass or bronze contacts and pre vents losses due to oxidation A one pound bottle of Coo Amp silver plating powder plates approximately 6 000 square inches Conducto Lube micro 0HMS 3 E NN Current in Amperes From the report compare the conducting properties of Conducto Lube lubricant with factory lubrication and non lubricated connections on an air Switch Identical test setups and procedures were used for each test so that comparative data could be collected and the relative perfor mance of each type of connection could be quantified The test results indicated that the contact resistance of the switch employing Conducto Lube was
36. Toll Free 24 Hours For orders tech support inbound fax and Fax Facts Instant catalog sheet service Computer BBS Modem amp Fax Modem 317 579 2045 International Fax en Espanol en Francais und auf Deutsch or just fax in plain English to 317 849 8794 wi 2 a ojojo SPORTCUT 9 z 9 99 o Get Radio Active Call 1800 4 COMMUNICATIONS 10707 East 106th St Fishers IN 46038 CIRCLE 212 ON FREE INFORMATION CARD 4 NDIG 199 45 7717 Service amp Support hours Mon Fri SAM to 6PM Sat 10 4 EST Mastercard Visa Checks Approved P O s amp COD add 5 50 amp AMEX Discover Prices specifications and availability subjectto change Flat rate ground shipping and handling charge only 6 95 per unit Express Air only 9 95 for most units to most locations J T PV CILE HIT D ze std m 500 MHz 6 x 12 x 16 Hx W x D only 16 LB 1 1300 MHz SPECTRUM DISPLAY MONITOR The SA500A easily attaches to any receiver IF output jack Providing a panoramic signal display of your 1 30 MHz and 30 to 2000 MHz scanner or communication receiver The SASOOA is a Professional Spectrum Surveillance Technology Monitor A Full Function Spectrum Analyzer with 5SKHz Narrow Band Filter Center Freq Display 50 MHz Marker Generator Capable of Tuning Duplexes Amps Filters Receivers Transmitters amp Perform EMI RFI FCC Testing SAS00A First affordable
37. a giveaway price Hurry get your Radlosonde today PERSONAL PROTECTOR ALARM G6152 12 95 Ear piercing volume of pulsating 130 dB jevel is emitted Irom this small device whenever the Strap is pulled out Great for high school or college Students shoppers joggers people on night shifts etc The sound from this is impossible to ignore it sabsolutely incredible in intensity Size of alarm only 2 1 8 x 2 3 4 x 13 16 Has removable belt clip Operates from one 9V battery not included In retail blister pack POPULAR ELECTRONIC KITS We have about 150 different kits Here s a small Sampling insanity Alarm Kit C6240 6 20 Wheel of Fortune Kit C3806 13 75 SMD IR Detector Kit C6489 7 20 Burglar Alarm Kit C6280 oo 8 75 Phasor Soung Kit C5406 7 25 Portable Filtered Black Light Kit C6471 23 95 20W 20W Car Stereo Amp Kit 06442 24 95 G6135 19 95 Electronic high tech game features a large easy to read displayand a convenient pocket size Choose either Poke or Biackjack with the press of a button Features automatic score keeping and operates fram 2 AAA batteries not included Blackjack features split surrender dealer stand on 17 double down on any points insurance when dealer has 11 variable 1 to 20 betting etc Poker features automatic 5 point bet per hand pl
38. and many other applications Ideal amplifier An op amp has many of the characteristics of an ideal am plifier It will be instructive to review the characteristics of an ideal amplifier and then com pare them with the perfor mance characteristics of exist ing monolithic IC op amps The characteristics of the ideal am plifier are Gain An ideal amplifier would have infinite gain However this is not desirable in a practical amplifier because the smallest input signal would cause max imum output Thus high but controllable gain is acceptable Input impedance An ideal am plifier would have infinite input impedance or resistance so its input source would not be in correctly loaded Output impedance An ideal amplifier would have zero out put impedance or resistance so that it could be connected to a load with any resistance value without affecting its output voltage i Bandwidth An ideal amplifier would have infinite bandwidth so that it could amplify any fre quency from zero hertz DC to the upper limits of the radio frequency spectrum Common mode rejection ratio An ideal amplifier would have an infinite common mode rejection ratio or CMMR This means that if the amplifier has two input terminals one positive and the other negative there will be no output if both inputs common mode receive the same signal simultaneously The output of an amplifier that exhibits high CMMR is essen tially a zero ou
39. area of interest CIE gives you 12 courses and a proven degree program to choose from CIE training qualifies you for work in broadcast engineering communications systems digital logic and systems training automo tive electronics computer maintenance microprocessor technology and much Learn electronics from the world leader right in your own home more In fact CIE pioneered the very first Electronic Laboratory course and the first Microprocessor course Even if you re not sure what you d like to specialize in we can get you started on the basics And once you ve successfully completed one CIE course you can apply academic credits and tuition credits to any new CIE courses you take Each and every CIE course counts toward earning your degree A patented method of personalized instruction Through CIE s exclusive AUTO PROGRAMMED teaching method your instructors give you prerecorded easy to follow step by step instructions Some courses are geared toward beginners and some toward professionals already familiar with the electronics field No matter which course you take you ll have everything you need to learn on your own at home lesson guides books even lab equipment All materials you can use at your current job or keep for your new job after you ve earned your degree Take control of your future with electronics training from CIE And if you ever need any help at all just call your instructor t
40. developed by M A COM VideoCipher II scrambles the video portion of the signal by replacing the horizontal and vertical sync signals with dig ital data The digital data Cet Pus 1 TILIIIILIIIIIIIIAIII fi p hd H i L f t sf 5 LEM SERO CIEL 6 nn AMEN ASC T THIS EARLY VIDEOCIPHER Il BOARD was compromised by signal pirates Notice that the potting compound has been removed from around the microprocessor and EPROM socket stream contains the audio portion of the signal as well as the authorization codes or ad dresses of all legitimate de scramblers The digital data are encrypted with the data encryp tion standard or DES Although the DES itself was never beaten by signal pirates VideoCipher scrambling proved to be easy to defeat through sev eral back doors De scramblers for example were cloned so that a single legiti mate subscription could turn on thousands of descramblers After pirates had compro mised the security of Vid eoCipher II General Instru ment Corp which bought the technology from M A COM was forced to develop a new scram bling scheme called Vid eoCipher II Plus The Plus system has yet to be suc cessfully hacked The most re cent version of the scrambling technology is VideoCipher Renewable Security or VCRS The VCRS system has two fea tures that make it resistant to piracy First developing a way to defeat the system would re quire a co
41. mc omm onm epp im i ti ui een jn FIG 1 THIS SIMPLE IC TESTER compares two logic signals and indicates whether the signals are the same or different THE BURNING MUST STOP NOW Rain forests occupv just 296 of the earth s surface Yet these rain for ests are home to half of the planet s tree plant and wildlife species Tragically 96 000 acres of rain forest are burned every day You can help stop this sense less destruction Right now you can join The National Arbor Day Foundation the world s larg est tree planting environmental organization and support Rain Forest Rescue to stop further burning You d a cali now Mon The National y Arbor Day Foundation Call Rain Forest Rescue 1 800 255 5500 causes bi color LED2 to light up green After that any low out put from a 74LS266 will trigger the latch circuit which drives the bi color LED to red That color indicates that at least one pin of the DUT doesn t agree with the good chip The faulty pin is flagged by the LED LEDI in Fig 1 attached to the corre sponding gates output Press the reset pushbutton again to start a new test The 330 ohm resistor that parallels the comparators in puts R2 allows the signals to the DUT to flow to the reference IC as well That resistor also pre vents the output of the DUT from affecting the reference IC The jumper that parallels the re sistor can short circuit the ground and
42. own Surely You re Joking Mr Fein man W W Norton 1985 and What Do You Care What Other People Think 1988 My other heros Well since you asked Perry Ferrell Buckminster Bucky Fuller Ed Abbey P T Barr um and William M Gaines think Gaines was the greatest phi losopher of the twentieth century Science Versus Pseudoscience is an important and easy to read Nathan Aaseng book F Watts Press 1994 It clarifies several top ics have kicked around here quite a bit My own definition of pseudos cience is pretty much one of looks like a duck quacks like a duck f recently reviewed several books HARDWARE ALL I da osc ience vec Si jE nce versi us p pse AOT Ma tScript inte ace a ind nd p rogra ammat I AM eee DON LANCASTER Science requires that claims be examined by peers science requiras objectivity Scienca is logical and rational g 3 4 5 B ri B B 10 Science does not accept anecodatal evidence as proof Science makes well defined claims Scientific hypotheses are falsifiable Sclentific experiments are repeatable Science views Unexplained gaps in theories with suspicion Science requires caution in examining evidence Sclence does not accept coincidence as proof 11 Extraordinary claims demand extraordinary evidence FIG 1 NATHAN AASENG lists these ten key criteria in his Science Versus Pseudos cience book h
43. slope exch store cvi abs incs exch store pop 0 0 1 incs 1 sub posn exch def S print curypos curypos 1 sub store posn 1 add slope mul 0 5 sub 1 index ge 1 add E print curxpos curxpos 1 add store if for pop def oct7 2 copy exch div neg siope exch store pop cvi abs incs exch store O 0 1 incs 1 sub posn exch def E print curxpos curxpos 1 add store posn 1 add slope mul 0 5 sub 1 index ge 1 add S print curyposicurypos 1 sub store if for pop def ffindoctant 2 copy exch 2 copy 0 eq exch 0 eq or pop 0 000001 if atan cvi 45 idiv octO oct1 oct2 oct3 oct4 octS oct6 oct7 oct0 exch get def main control loop iIIi demo remove or alter before reuse 95 should return EENEENEENEENE FIG 4 A STEP TO VECTOR CONVERTER written in PostScript stitute for it pretty well Cruder useful substitutions are 0 5 an gle in degrees 300 Or you could even let 0 44 split the difference Some CAD CAM applications will let you move your x and y step pers simultaneously This is called stepper phase interleaving It means that you can travel east or northeast in octant zero What you have done is combined an east step with a north step into a single north east one eliminating a sharp corner in the process That dramatically im proves the resolution speed and smoothness of the actual cuts Fig ure 3 shows the improved results But why calculate the obvious over a
44. 10M sliders FM amplifiers books kits repairs high performance accessories The best since 1976 Catalog 3 00 CBCI Box 31500EN Phoenix AZ 85046 RESTRICTED information surveillance and schematics locks cable hacking more Details MENTOR Box 1549 Z Asbury NJ 07712 CABLE test chips as low as 4 95 for testing cable boxes in full service mode Jerrold Star com Vl VII amp R2 V amp Jerrold cubes Pionest clears E2 thru E5 Paneer cubes BA 5000 thru BA amp 700 Tocom 5503 5507 Scientific Atlanta amp 500 thru B600 Zenith alt but P21 remoies 10 00 N E ENGINEERING 1 BOO 926 4030 lax 1617 770 2305 MON S231001199 3 666 uenuepm Electronics Now January 1995 99 1 29 023 10 WHOLESALERS INC BEST BOXES BEST PRICES Immediate Shipping COD s Satisfaction Guaranteed FREE Catalog Call Now 800 841 7835 CABLE TV converters Jerrold Zenith Pioneer Oak Scientific Atlanta and many more 12 years experience gives us the advantage Visa MC Amex COD ADVANTAGE ELECTRONICS INC 1 e20 952 3916 1125 Riverwood Dr Burnsville MN 55337 THE Case Against the Patents Thoroughly test ed and proven alternatives that work in the real world 28 50 SYNERGETICS PRESS Box 809 C Thatcher AZ 85552 602 428 4073 Visa MC CABLE descrambling New secret manual Build your own descramblers for cable and sub scription TV Instructions schematics for SSAVI gated sync
45. 40 1 50 1 60 2 10 MAR 1 MAR 2 MAR 3 MAR 4 MAR 6 MAR 7 MAR 8 0 99 1 35 1 45 1 55 1 29 1 75 1 70 Freq MHz DC to 1000 42000 2000 1000 2000 2000 1000 1000 Gain dB at 100MHz 185 12 5 12 5 8 3 20 13 5 32 5 127 Output Pwr dBm 1 5 45 10 0 12 5 2 0 5 5 12 5 17 5 NF dB 5 5 6 5 6 0 6 5 3 0 5 0 3 3 3 6 Notes Frequency range DC 1500MHz Gain 1 2 dB less than shown designer s kit KH 1 available only 59 95 includes 40 AMPLIFIERS 10 MAR 1 10 MAR 3 10 MAR 4 10 MAR 8 150 CAPACITORS 50 100 pf 50 1 000 pf 50 10 000 pf 740 page RF IF DESIGNER S HANDBOOK e MIXERS POWER SPLITTER COMBINERS AMPLIFIERS amp Q2 QPSK MODULATORS ATTENUATORS TERMINATIONS DIRECTIONAL CQUPLERS e RF TRANSFORMERS DIGITAL ATTENUATORS PHASE DETECTORS SWITCHES DRIVERS e FILTERS LIMITERS FREQUENCY DOUBLERS hes d values or models may be substituted without notice Typical Circuit Arrangement ELECTRONIC ATTENUATORS depending on supplies Rbias A CC RFC optional Cplock Ia ic I OUT a m oue i i hd wrACCEPI AMERICAN EXPRESS ANO VISA EUROPE 44 252 835094 Fax 44 252 837010 CIRCLE 193 ON FREE INFORMATION CARD F155 REV A
46. 5 volt pins of the DUT to the reference IC so the reference IC can be powered by the DUT circuit Power for the remainder of the test circuit LED comparators and latch must come from an external power supply Remember that the tester is designed for testing 5 volt TTL and CMOS devices only To pre vent damage do not exceed e en ee ee ae m ee ee NN NE e ee UI 9 IC2 a V3 Ic2 c 8 4 1 4 7400 1 4 7400 J n e i i de i e RP o d LED2 that voltage on any pin The tester can be converted to a logic analyzer by inserting a DIP header into the test socket All of the DIP header pins except the power pin should be con nected together and grounded This will allow you to monitor the signals going to and coming from the DUT with the green LEDs Tester use To use the tester first connect the test input to the suspect pin of the DUT Next connect the reference input to the same pin of an identical reference chip that is known to be good Push the reset button to begin the test the green section of the bi color LED will be illuminated Any signal on the test device that differs from the one on the reference device will then mo mentarily light the LED lamp that corresponds to that pin and also latch on the red section of the bi color LED That indi cates that the device under test is faulty If the reference and DUT signals are the same the DUT is OK and the green vet will remain lit J
47. 74HIC373 69 4098 T9 M308 ses 75 LM711 89 74 9138 49 TALS541 s 99 74808 C374 69 I0Q9 83 LM309H 4 25 M723 qm 59 741 8139 49 74L 573 1 49 74H C390 2 59 40106 gune os ii l M309K 209 1723H 129 7ALS1 69 T LS574 1 49 74HC393 E 69 40107 c xm T L M310 5a 189 MAX732 5 50 A243 7 83 24LS590 4 95 7ANCS4O 109 40161 179 E5519 cco MIS een 69 TALS148 Bo MLS595 5 95 74HC541 B9 40163 100 Maha 89 ETAT gt A0 74 5151 49 TALS612 1 99 748C573 B9 40174 89 LM312H 50 LM741HC 1 09 748153 49 J4L9620 2 99 74MC574 B9 40192 269 M312 80 LTAT 69 74LS154 149 14LS623 1 49 7A CS95 129 4500 LMGITK 209 LU748 2l 69 7418155 z 59 TALS624 2 19 748 C640 1 85 4501 b 65 CM317T 79 LM1014 269 74 5156 59 TALS629 2 19 7480652 179 1502 n 90 M317 B0 SA1027 6 99 74 8157 2 59 TALS640 1 09 7AIIC5BB 1 19 4503 Fd BS 49 o To92 30 M X1232 3 29 i 138 MLS641 1 50 7ANCAOIT 99 TEDA d TO LM1303 1 69 Tal S158 38 RALSG43 128 JAMCAOQO 89 Tepe 7777 25 135 LM1310 1 39 TACOS 11 74 MLSO45 1409 T41CA024 99 155 77777 B DAD 09 MC1330 1 69 TALSI6 4 MLSG46 239 TAIWCAOAO 89 TENE 77 199 LMQ22 98 C1349 209 Pareres 85 PLS668 1 39 TAMCAOA9 59 Pr Ol Phat ae
48. BG EPEPPOP SO oR eR REE OPER ORR ED TOROIDS IRON FERRITE T 26 2 an 35 FT37 43 60 T 25 6 35 FT37 61 60 T 37 8 cc 45 FT37 T s 60 T 37 12 45 FT50 43 75 1 50 2 amras 55 FTS0 61 75 T3850 9 Lee B5 FT50 77 75 150 8 e 55 FT82 43 1 00 T68 0 75 FT82 67 1 00 TOB 2 Laser 75 FT82 68 1 00 T68 6 75 FT114 61 1 90 T80 2 e 90 FT140 43 3 15 T200 2 5 00 FT240 61 8 00 WE STOCK A COMPLETE LINE OF TOROIDS AND BEADS Q DOPE 8 Solution of pure polystyrene in solvents Dries P tasi and leaves a clear protective coating on toriods coils and transformers with no or Sf minimal effect on inductive values May also be used as a cement lor molded or fabricated items made of polystyrene 9 Bone with Brush 2 fl oz 59 ml 3 75 VERNIER DIALS 1 1 2 Diameter 0 10 Marking 8 25 1 1 2 Diameter 0 100 Marking 9 25 2 Diameter 0 100 Marking 10 25 SIGNETICS NE602AN Balanced Mixer OSC Popular IC among experimenters for building OC and super het recovers POMA 2 49 MINI CIRCUITS SBL 1 DIODE RING MIXER Double balance Mixer LO RF 1 500MHz RF OC 500 MHz 7 75 LINEAR IC S TRANSISTORS NE555 45 PN2222A 10
49. Book 1 6 50 A collection of over 150 analog Signal circuits on audio signal and power amplifiers OC amplifiers signal filters high pass low pass band pass and notch tone controls voltage controlled amplifiers and filters triggers and volt age comparators gates and electronic switching bar graphs mixers phase shifters sensors digital circuits etc See BP322 at right BP322 Circuit Source Book 2 6 50 Contains over 170 circuits on sig nal generation power supplies and dig ital electronics A continuation of BP321 Topics are 555 oscillators sinewave and function generators CMOS oscilla tors voltage controlled and RF oscilla tors 555 TTL and CMOS monosta bles precision long timers power supply and regulator circuits and many other useful circuits See BP321 at left O PCP109 Everyday Electronics Data Book 10 00 An invaluable source of electronics in formation the text con tains many sections that deai with the underlying theory of electronic cir cuits and a wide range of practical electronic ap plications O BP301 Antennas for VHF and O BP292 Public Ad dress Loudspeaker Systems 6 95 Cov ers the moving coil loud speaker baffles the basic requirements of a PA system sound pat terns line source horn loudspeakers low im pedance matching and much more LESE vs E BP106 Modern OpAmp Projects 5 75 Various projects that ma
50. Call today for more information 1 800 253 0570 Yes E Send me more infarmation on Heath amp its Mastercourse in Personal Computers Flame addres Addres CI ty State Zip Phone Z Heathkit sBenton Harbor MI 49023 1288 a P E 1 800 253 0570 P 1 Box 288 code when caling 020 030 Please mention this HEN vl Mr ug 4 Electronics Now January 1995 VIDEO COMPUTER DISC CHIP SET Texas Instru ments has introduced the industry s first video CD chipset that is expected to simplify the design of Mov ing Picture Experts Group 1 MPEG 1 video and audio decompression subsystems The chip set decodes synchronizes and decompresses audio video data that has been encoded to the MPEG in ternational compression standard Capable of introducing a full motion video FMV subsystem to home enter tainment products such as CD based movie players video games and karaoke systems the set consists of the TMS320AV220 MPEG 1 video decoder the TMS320AV120 MPEG audio decoder and the TMS320AV 420 National Television Standards Com mittee NTSC encoder Those three devices in stalled with a 4 megabit DRAM and a digital to ana log converter for the con SMT THRU HOLE REPAIR CENTER The SMD 250 surface mount and leaded component repair and re work station from A PE is a set of tools for removing and replacing surface mount and
51. Capacitance Reg 149 89 00 DM5050C 9 Function 42 Range Basic DCV Accu 0 2596 Multimeter Volt AC DC Amp AC DC 2A Ohm Up to 2000MQ Diode So DC to 40 MHz Dual Channel Delayed Sweep 100nS to I O S 7 decade 6 Rectangular CRT with internal Graticule 10x8cm Phillips P31 e Uncalibration LED High Sensitivity 1 mV div to Continuity Beeper 20V div X Y modes Z Axis Capacitance 9 Range intensity modulation 0 1pF 20 000 uF e Rise time 8 5nS or less Zero Adj Knob Trig Lamp Full TV Trigger for TV V amp TV H Acceleration Potential 12kV Variable Hoid Off 16ns 1 0s Time Base 60MHz X1 X10 Probe Kit 2 sets e Power 115 230V AC Double Insulated Jack Alligator Clip Test Leads Deluxe Holster w Strap Wide Range Multimeter w Logic Reg 749 89 00 Data Hold amp Peak Hold Alligator Clip Test Leads Deluxe Holster w Strap o Holster Onder amp Gree Catalog 714 586 2310 Fax 714 586 3399 CIRCLE 291 ON FREE INFORMATION CARD 150 LE Student 990087 LOW BATTERY INDICATOR DIODE TEST BATTERY TEST NilLviN 20042 LIT EP Cr e s Ba C MEN be 5 ET Li E LJ E a er 990126 AC amp D 0 5 ACCURACY VOLTAGES RANGES 20mF RESISTANCE 3 1 2 Digit LC
52. DET eme AC 0225 515 DAX DIC fee 89 79 ADD ON DESCRAMBLERS 10 LOT SPECIAL PIONEER GREEN pat 2235 re ED oo coe rii elt BS gto mp meii 42 Ee voro E Ol Bor SWAMI ees AC buic ene 42 Mex EUR he Gn xxn PIEMDEDIPSDSS S to ra d kerges a 35 JPOP u uox eer EE a ee 49 NOTE MENTION AD FOR THESE PRICES NO MICHIGAN SALES We are now offering a 6 month warranty In order for warranty to be in effect this form must U be signed and returned FOR VCR SECOND THIRD ETC HOOK UPS sum d mm C EE T eee j J YES I agree all units are to be used or resold in compliance with Federal and State laws I amp l 1 m l l i Signature a aus caeteri sts m ages ae RS a a C ee s e e RA 3 b NAM L LLL LL Ls o ee lE eS snes 5 QA MEME i B i i A CITY NENNEN STAM ZIP PHONE ii m L It is not the intent of B amp S Sales to defraud any pay television operator and we will not assist any company or individual in doing the same f CIRCLE 217 ON FREE INFORMATION CARD Electronics Now January 1995 In recent independent tests Cool Amp is proven better than electroplating For 50 years we ve said Cool Amp is equal to electroplating in performance It is better Cool Am micro 0HMS Elapsed Time From the report compare the conducting properties of Cool Amp silver plat ing compound with factory silver elctro plated bus and bare cop per Dus
53. DMMs Fio 85 259 Input warning ak Ho za solar cell Fluke 87 287 lt T Splash proof Auto power off automotive heavy AA Volt amp ohm logic diode continuity Ruggerdized case duty industrial Fluke 97 Ruggerdized case Rubber Holster 8 00 starts from 15 95 Scope Meter 1785 Rubber holster included Temperature probe 7 00 LCR Meter 131D E LCR Meter 814 229 95 189 95 Most Advanced LCR Best Resolution LCR Dual display L Q or C D Inductance 0 1yH 200H Inductance 0 1pH 1000H Capacitance 0 1pF 10 0004F isla oo Impedance 1mQ 10MQ po 196 basic accuracy 0 796 basic accurac asic x D paion nacre sa tactor Dissipation factor indicates leakage Serial amp parallel mode in capacitor and Q factor in inductor Relative mode for comparison Zero adjustment to reduce parasi and to remove parasitics tics from test fixture Statistics tolerance Best for high frequency RF Best for design incoming and surface mount components i SMD and chip component test probe testing amp production SMO and chip component ah ni carrying test probe 25 00 y Frequency Counter FC 1200 129 95 Frequency 0 1Hz 1 25GHz Display d uU Period Oe Records ax Min Average Data hold relative mode Telescoping antenna 8 00 Deluxe case E QO Also Available AC DC clamp meter Light meter Thermometer d meer High voltage probe Digital caliper Anemometer Electronic scale Force gauge Tachometer Stroboscope Hum
54. Head Cleaner Videocassette 19 95 each 3M Black Watch T120 Hi Pro VHS 4410 Videocassette 8 00 each Shipping and handling per order 4 00 Total Amount in U S Funds only New York State residents add local sales tax Canadians add 6 00 per order No for eign orders Do not send cash visA L MasterCard Expire Date sf Bill my Card No Signature Name Please print Address City ee eee continued from page 8 LONG CABLE RUNS My office has a small network installed and we recently took some more space on the floor below us want to put the com puters in the new office on the network but the Novell manuals specify a maximum of 250 feet of cable on either side of the file server Is there some simple way to get beyond this limit have to go almost twice this distance to reach the new office G Nightingale Bamford NY The best around this problem de pends on who gives the advice Network people will start talking about a WAN wide area network hardware people will start talking about transceivers or short haul modems and everybody will talk about spending a lot of money Its true that networks work best when cable length limitations are observed and transceivers are in stalled when you must exceed stan dard distances However the maximum possible cable length without any degradation in network performance is also a function of the cable and connectors Network cable c
55. In the last paragraph of the article the word chokes should have been iron core chokes and larger ferrite core chokes and coils At 60 Hz the reactance of a 100 MHz coil is about 36 ohms and many of the coils in the photo look much smaller than those suitable for 100 MHz operation If the test frequency were higher smaller coils could be tested As a result of reading this article now have some ideas for a simple circuit operating at 2000 to 3000 Hz with an audible as well as a metered output plan to get to work on this project soon BILL STILES CET Hillsboro MO MORE ON TRANSFORMERS have been reading Radio Elec tronics and Electronics Now since the 1970 s and have enjoyed learn ing and gaining ideas from your magazine especially from authors like Don Lancaster The magazine seems to have a good balance be tween simple and complex articles and projects believe that many newcomers to electronics can learn from the simpler articles if the technical information in them is accurate and complete That is not the case with A Sim ple Test for Transformers Elec tronics Now November 1994 The article did not point out some short comings and hazards that are in volved in the test method pre sented The inductive reactance of a coil winding depends on the number of turns and the core material For ex ample an air core winding would not have sufficient reactance at 60 Hz for the test to
56. Muscle Wires Project Book amp Deluxe Kit Create direct linear action with Muscle Wires They actually contract up to 5 when powered For robots planes railroads anything needing small strong all electric motion Our new info packed 128 page Project Book has full plans for Boris the motorless robot and 14 other projects Deluxe Kit includes one meter each 50 100 and 150 um diameter Muscle Wires Get moving today 3 168 59 95 Electric Piston Deluxe 5 Pack lift 1 pound each Just 10 cm long they shorten by 23 mm with just 1 volt 5 amps Cycles A up to 6 times per minute Pack has 5 Electric Pistons one high ME current battery and complete I plans for four unique projects 3 137 39 95 Robot Builder s Sonam 99 Inexpensive Robotics Projects A huge collection of practical ready to use circuits amp devices Sections on parts tools methods remote control vision grippers navigation amp more 336 pages 280 illus A great value for robot builders of all experience levels 3 114 17 95 i i M n ROBOT BUIEO BON LDER s 99 INEXPENSIVE ROBOTICS PROJECT Space Wings Il now variable speed Sleek silver wings flap silently using only 5 cm of Muscle Wire Perches on your PC annoys cats Flaps up to 36 times per minute With circuit board parts detailed instructions Requires soldering and 2 AA batteries Makes an ideal introduction to electronics 8 and Musc
57. NDOO ANDREPARNG B D sasumarmm pU i Me BASIC MATHEMATICS AUDIO amp VIDEO IE FOR ELECTRICITY CASSETTE PLAYERS E Ana ELECTRONICS pee war 4359P 519 95 3279P 26 95 Home R ret f BEGINNER S ca Ys Gee amp Automaticn Projects IDE 3 ui deus iw y AD si ban NOS X Compatibse and ar a Bundle SCHEMATICS B SECORD 2DITION 9 haz N POWERIT at t 1 P Fi SAP on 4 1 j 1 D s a ed es ie LA LS 4061P 9 95 3765P 19 95 4089P 18 55 3887H 526 95 4179H 28 95 Hardcover Hardcover ion f A 3 Incredible P pium a8 of ug 4 lt lt Eis E ond aud disi use Audiv amp iC p j aj S E a Vide MM Ac mv j Es uH Epi IONES Projects for the elect amics E E L em nO f You Can hoofylst is E GANSWERIN Build LUSSEATED T 3 LAGHINES cv 4 GMAF E TLLIAMS b i LAMLSHIDTS TEEI m y din En Ti E fu WI oa 6 Tee uid HI eae Es EN al r 3700H XX 36 95 4325H XX 39 95 3711P 19 95 4122H XX 36 95 4199H 29 95 Counts as 2 Hardcover Hardcovee Counts as 2 a Counts as 2 Hardcaver Hardcover 4416P 9 95 Select any books Plus get book FREE upon prepayment when you join the ELECTRONICS BOOK CLUB BUILD YOUR OWN Low cCosT PC 4198H 28 00 4209P Hardcover 519 95 TV REPAIR FOR BEGINNERS eT te wtc r RECEIVER PROJECTS Ua IR i pajos URGE Zadie 3627P 19 95 BUILD YOUR OWN ELECTRIC VEHICLE Designing B
58. Port C and bring ing PA2 low will set output 2 to power level 8 Because Port C has only four input bits it can only specify 16 power values 2 16 Thus a look up table shown in Table 3 spreads the 16 specifiable values across the entire 32 value range Sequencer This routine demonstrates the controller s ability to power light displays It turns on the first output waits Continued on page 90 that believe are worth reading Who Owns Information by Anne Branscomb Basic Books 1994 seems to cover everything from the Internet to the Dead Sea scrolls It focuses on the new intel lectual properties that are challenc ing traditional copyright laws While the book is thorough it es sentially expresses the viewpoint of a conservative lawyer This book would be far better balanced if it had more input from publications such as the Free Software Foundation cr Wired Magazine For a totally different take on a related topic read Winn Schwar tau s Information Warfare Chaos on the Electronic Superhighway Thunder s Mouth Press 1994 l ve long been a fan of Richard Feynman the physicist and gadfly He was one of my great heros No Ordinary Genius The Illustrated Richard Feynman has been newly released by Richard Phillips W VV Norton 1994 It s a life and times of summary that adds to such titles as James Gleick s Life and Science of Richard Feynman Pantheon 1992 In addition read Feinman s
59. and thought have gone into the de velopment of such unis to overcome problems O BP350 Electronic Board Games 56 00 Board Ga bx Complete plans for 20 manar novel electronic board amp games that you can build EU IA VE us with ease Some pro et AES den jects are Motor racing A searching for buried trea Ca De AES sure or gold at Ft Knox wheel of fortune a mu Sical quiz plus others O BP109 The Art of Programming the 1K ZX81 3 95 O BP114 The Art of Programming the 16K ZX81 4 95 O BP119 The Art of Programming the ZX Spectrum 4 95 O BP129 An Introduction to Programming the ORIC 1 3 2 50 O BP128 20 Programs for the ZX Spectrum and 16K ZX81 4 75 CO BP143 An Introduction to Programming the Atari 600 800 XL 4 95 C BP187 4 Practical Reference Guide to Word Processing on the O BP154 An Introduction to MSX Universal Japanese BASIC 4 95 SYNTHESIZERS O PCP106 Synthesizers tor Musi cians 10 00 Written especially for musicians the book explains all current popular forms of synthesis covering LA additive phase distortion FM and sam pling The theoretical side of synthesis is treated in an easy to understand way the technical information being restrict ed to what you need to know to use your instrument effectively Ideal for begin ners and muscians COMPUTER TOPIC BUY OUTS O BP156 An Introduction to QL Machin
60. are happening Now there s an incredi ble new device that lets you use a stereo receiv The secret of surround sound Surround sound has become the rage of the 90 s because it adds depth and realism to stereo sound giving you the home theater experience It makes you feel like you re ac u tually at a concert or theater To fill a room with surround sound you need more than two channels The HTS 1 provides five channels of sound from any iwo channel stereo source Free center channel By connecting your VCR or laserdisc player to your TV you get sound from your TV speaker this acts as the fifth or center channel Upgradeable The new HTS 1 gives you the ability to upgrade by adding the Dialog powered center channel speaker instead of using your TV speaker The decoder can also feed an extra amp for the rear speakers if you want the ultimate in discreet five channel performar ce Submerge yourself in rich surround aa the new Chase HTS 1 when used to decode the hidden ambience in all musical recordings defi nitely outperforms all the Dolby and THX processors which could cost you up to 3 000 I am impressed Passive circuit Last year audio industry veteran and Chase president Bob Rapoport invented a new five channel passive cir cuit for decoding every surround sound encod ed movie available This new decoder can be used with two three four or five channels of amplification
61. back guarantee 20 00 minimum order We accept Mastercard Visa Discover and company C O D orders 24 hour shipping Shipping charge UPS chart rate 1 50 4 00 minimum charge Hours 8 00 am 8 00 pm ET Monday Friday 9 00 am 5 00 pm Saturday Mail order customers please call for shipping estimate on orders exceeding 5 Ibs Foreign destination customers please send 5 00 U S funds for catalog CIRCLE 262 ON FREE INFORMATION CARD 3M Heat Shrink Tubing Kit This conve nient 90 iece kit includes 25 pieces mmm of both 1 16 and 1 8 dia 5 clear 5 blue 5 red 5 yellow 5 black 20 pieces of 1 4 dia 4 clear 4 blue 4 red 4 yellow 4 black 10 pieces of 1 2 dia 2 clear 2 blue 2 red 2 yellow 2 black and 5 pieces of 3 4 and 1 dia 1 clear 1 blue 1 red 1 yellow 1 black Each piece is 6 in length EN 082 900 T Tripp Lite Audio Video System Power Protection THE POWER PEOPLE Now you can get the proven Tripp Lite power protection right in your audio rack The IBR 12 rackmount Isobar has all the advanced features you expect from an Isobar in a convenient 1 rack space unit 12 outlets provide ample power for all your audio visual gear and two isolated filter banks provide you with extended noise filtering for your most sensitive equipment Features the 10 000 Ultimate Lifetime insurance against surge damage for unit and connected equipment Dimensions 19 W x
62. be valid A good coil would appear as a short circuit and its windings which would only rep resent a low resistance could burn out if high current were applied The test method in the article is suitable only for low frequency iron core transformers measured the short circuit out put current of a 6 3 volt 600 milli ampere transformer obtained a reading in excess of 2 5 amperes If a 10 kilohm 2 watt flameproof resistor is wired in series with the primary winding of the 6 3 vclt transformer the secondary short circuit current is reduced to a safe value of less than 200 milliamperes It is important to point out that when testing a step down trans former s secondary winding an un expected high voltage which would constitute a shock hazard can appear on the primary winding ROBERT J JOHANSEN Staten Island NY QUESTIONING CSICOP The Committee for the Scientific Investigation of Claims of the Para normal or CSICOP recently praised by Don Lancaster and Larry Klein does precious little scientific investigation and a lot of debunking and smearing of claims of the para normal The committee has three main operating principles 1 Condemnation before investi gation The committee will not seek to verify claims of UFO experi ences success with dowsing out of body experiences or sightings of spirits It denounces claims pre sented to them Judging from its written opinions the committee is ad
63. below We look forward to your patronage BANK ACCOUNT Mitsubishi Bank Ak nabara Branch Branch No 011 Account No 0044470 Akizuki Denshi Co Ltd st Floor NomzuBlag 1 8 3 Sotokanda Chiyoda ku Tokyo Japan 101 7 Telephone 03 3251 1779 Facsimile 03 3251 335 Supervisor Mr Tsujimoto MON S214001129 3 G66 Menuer Electronics Now January 1995 amp ee 2 NEW BOOKS LI for the Project Builder Gens C aoano canes S0 Twenty novel electronic board games that you can build from the plans in this book Whether you are interested in motor racing searching for buried treasure on a des MEE ert island or for gold in Fort Knox spinning the NE of fortune or doing a musical quiz there is something for you to build and enjoy R GESRINGTON 2 x ne ag or LAr H E DE n1 if 3 PCP119 ELECTRONIC MUSIC AND MIDI PROJECTS Save cash by building the MIDI gadgets you need Want a MIDI THRU box program change pedal Metronome analog echo unit MIDI patchbay or switcher Over 16 prac tical and very useful music and MIDI projects all in this book The projects are explained in detail with full instructions on assembly Antennas c c PP301 ANTENNAS VHF and UHF FOR VHF AND UHF ROW o mmm 6 00 From installing a TV or FM antenna to setting up a muiti antenna array for shortwave listening or amateur radio this book
64. bicycles automobiles games of hide and seek and contests XTR100 C Kit male female to maie adult to child chiid to aduit Use with any modular phone 16 levels of voice masking io Connects between handset and phone VOICE CHANGING ACCESSORY STOP THOSE ANNOYING TELEPHONE CALLS Sound older and tougher when you want to Not a kit Fully assembled Use with single or multi line phones 6 TOLL FREE ORDER LINE 1 800 336 7389 ASK FOR FREE CATALOG OF OUR PRODUCTS FOTRONIC CORPORATION BUY WITH CONFIDENCE FROM XANDI 30 DAY REFUND POLICY TECH SUPPORT NUMBER 602 894 0992 e Uses sensitive microwave transistor ampie e Covers 1 to 2 000 MHz Compact hand held unit inciudes miniature loud 3 Speaker for audio indication of detected signals SUPER SENSITIVE BUG DETECTOR When the XBD200 intercepts a signal in the 1 to 2 000 MH range it emits a grow that increases to a high pitched squeal as the signal strength increases XBD200 C Kit Te Works with any FM broadcast receiver e Turns off when phone is not In use to extend battecy life EM from 88 to 108 MH Up to 1 mile ange Gn n LONG RANGE PHONE TRANSMITTER Similar to our very popular XSP250 the XTT100 is battery powered for greater range It plugs into any phone jack and transmits both sides of conversations on that line XTT100 C Kit Uninterrupted coverage of 800 to 950 MHz G Works w
65. feeding the 4040 counters Since the largest value you ll have for N is 6 for a 12 cylincer engine you can do the division with a 4017 decade counter and a bunch of jum pers as shown in Fig 1 When the PC board is laid out jumpers can be added to configure the tachometer FIG 1 DIVISION IS DONE by a 4017 de cade counter The jumpers can config ure the tachometer circuit for engines with different numbers of cylinders s ne A dat SA ta i ey e Ar Ie e FIG 24089 RATE MULTIPLIER Sigurd fay ai zi 19 circuit for engines with different numbers of cylinders The most straightforward way to handle the multiplication operation is with a rate multiplier The 4089 is a CMOS binary rate multiplier that is perfectly suited for the required multiplication The pinout of the chip is shown in Fig 2 When a clock signal is fed to pin 9 of the 4089 with most of the control pins grounded and a binary number is placed on the data inputs the chip will have two different outputs The first output is the BASE RATE and the second is the MULTIPLIED RATE The relationship between the two out puts makes the chip perfect for the tachometer application For each pulse that is output at the BASE RATE pin a number of pulses equal to the binary number preloaded at the data inputs are produced at the MULTIPLIED RATE pin To multiply two numbers X and Y with a rate multiplier present one of them to the data inputs be
66. in house repairs The Shack solution Radio Shack for years has had a well established in house repair ser vice to handle its own exceptionally wide range of electronic products oeeing an opportunity to bring a na tionally known and responsible company name to an enterprise that strikes many consumers as a stress inducing caveat emptor sit uation Radio Shack has apparently committed itself wholeheartedly to the consumer electronics repair business The Repair Shop at most Radio Shacks will handle more than 40 brands of equipment with the usual cost of repair ranging from 50 to 975 In truth don t fully understand the economics of the situation from Radio Shack s point of view but the company president estimates that the new repair business could gen erate 500 million a year by 1999 Their prospects seem favorable According to the U S Commerce Department consumers spent a total of 3 8 billion last year getting their electronic goodies fixed And find it embarrassing that contrib uted my pittance to that pot Q t s been a long time coming but we re down to the last leg in the design of the tachometer At this point some arithmetic must be done and here s where the job can get tedious The output of the latest circuit see November 1994 is the number of sparks produced by an engine every three seconds The following formula converts that to revolutions per minute rev min sparks sec x re
67. internal amp external sources ALFA ELE C TRO N ICS 800 526 2532 609 520 2002 da DAY MONEY BACK GUARANTEE 1 YEAR WARRANTY 741 Alexander Rd Princeton NJ 08540 FAX 609 520 2007 CALL OR WRITE FOR FREE CATALOG AND BEST OFFER Visa Master Cardi American Express COD Purchase Order Welcome CIRCLE 213 ON FREE INFORMATION CARD 4 ch 8 traces OS 6101 1 49 4 inde adc channels 8 traces Time Voltage cursor measurement ALT triggenng function for 4 ch Sweeps to drv Delayed Sweep TV yu Ch output Z axis input 2 probes xl x10 100 MHz Scope 4ch 8 traces Best value all purpose scope 1 32 OS 6100B 4 channels 8 traces i High sensitivity 500uV div Sweeps to 2ns div Delayed sweep 20 kV accelerating voltage TV sync Z axis input A and B gate outpu Best price 100 scope 2 probes xl x10 50 MHz Triggering Oscilloscope OS 653 ALT Trigger OS 622B D ce et t oparai gt c Z axis in tput High sensitivity l MVA TPE Trigger level lock 2 probes x1 x10 OS 935 S MHz One channel AL FA E LECTRO NICS 800 526 2532 609 520 2002 15 DAY MONEY BACK GUARANTEE 2 YEAR WARRANTY CALL OR WRITE FOR FREE CATALOG AND BEST OFFER Visa Master Card American Express COD Purchase Order Welcome 741 Alexander Rd Princeton NJ 08540 100 MHz Cursor Readout Scope 9 95 9 95
68. is a must 6 A parental lockout system should be built in or alternatively the disc should be able to accommodate two versions of the same program At our press time two major sys tems appeared to be vying for in dustry standardization Sony and Phillips are collaborating on one system whose disc physically ap pears identical to a standard audio CD and actually has one way com nt 4 Ww i E S gt RO Hunc l WU TELECONFERENCING TAKES ON NEW MEANING with Sharp s Viewcamteleport which allows the transmission of full color still video images over ordinary phone lines patibility with audio CD in that DVD players will be able to play audio CDs The other system is being pro moted by an alliance of Toshiba and Time Warner That system accord ing to some reports is the same Size as an audio CD but has two sections laminated together al though it s a single sided disc Both the hardware and the soft ware industries are anxious to field a single standard system to avoid a duplication of the Beta VHS con fusion The advantages of the DVD system presumably include sub stantial core savings in replication and shipping because of low materi al use and light weight higher pic ture quality presumably including the aoility to display widescreen movies in full width ard resolution and better audio than existing sys tems e Recordable digital discs While the electro
69. is an Operating System Nov 90 Why Microsoft Will Win and IBM Will Lose the OS War Oct 89 Computerized Game Build This Retzinger C Jul 62 Compuvideo Oscilloscope to Vectorscope Converter ER May 16 CONSTRUCTION 68705 PIC Microcontroller Programmer Beard Jan 43 68705 Based Experimenters Clock Beard Feb 59 Adjustabie Continuity Tester Kennedy Aug 8 AM Power Loop Antenna Gault Jun 44 Automatic Rechargeable Flashlight Spiwak Oct 65 Build A An The This Amateur TV Station Sheets amp Graf Jul 31 Aug 39 Audio Wizard Test Generator Wannamaker Apr 41 Computerized Game Retzinger Jul 62 Digilyzer Yacono amp Spiwak Jun 75 Distinctive Ring Decoder Keeley Mar 43 Light Controiled Sound Effect Generator Canivan Sep 65 PC vO Breadboard Dage Jun 51 Jul 55 Aum 59 PLD Programmer Brown May 39 Retro Remote Templin Dec 31 Solid State Tesla Coll Turner Nov 61 Telephone Call Restrictor Weeder Oct 51 TubeHead Simonton Jun 33 Catch an April Fool Spies Apr 75 Creating Chaos Sonntag Nov 47 Frequency Doubier Yacono Nov 44 MON S231004129 3 g661 Menuer Electronics Now January 1995 LED Head The Sonntag Jul 41 Long Range Body Heat Detector lannini Feb 38 Lost Art of Regeneration The Kitchln Mar 66 Low Cost Coiorimeter Schnable Alessandro amp Orr May 45 Micro Lights Retzinger Dec 39 MicroConductor The Tarchinski Sep 49 Minute Marker Palmer Sep 73 Siga vica Scopes Justic amp P
70. is available separately The unit has enough practical uses that many hobbyists and many professionals who need an extra os cilloscope might want to take ad vantage of the deal Operation O Scope is connected to the PC s printer port with the supplied ribbon cable The default port is LPT1 but other port addresses can be specified when the program is started A test program is included for users who are unsure of the ad dress of their computer s printer port An AC adapter that plugs into the scope module and provides the necessary 12 volts DC os cilloscope operation is supplied A standard X1 or X10 os cilloscope probe not included con nects to a BNC connector on the module A probe is not included with either the assembled O Scope or the kit The program runs in DOS only and is started by typing OS MON S21001129 3 GEE Menuer Electronics Now January 1995 Earn Your B S Degree in COMPUTERS LE a 2 P omi E coed j d By Studying at Home Grantham College of Engineering now in our 44th year is highly experi enced in distance education teaching by correspondence through printed materials computer materials fax modem and phone No commuting to class Study at your own pace while continuing on your present job Learn from easy to understand but complete and thorough lesson materials with additional help from our instructors Our Engineering Technology B S Deg
71. isolated output and allows for serial or parallel connection of multiple units Fully adjustable current limiting protects circuit under test and power supply Protected from reverse polarity overvoltage and short circuit Specifications Constant Voltage Mode Voltage control OV to rated voltage coarse and fine continuously variable Load regulation 0 0196 3mvV Line regulation 10 variation 0 01 3mV Noise and ripple 1mV RMS Constant Current Mode Current control 5 to 100 rated current Hi Lo ranges continuously variable Load regulation 0 2 3mA Line regulation 0 2 3mA Noise and ripple 3mA RMS snaking wires under carpet or through walls Use for stereo speaker wires phone lines or cable TV coax 7 diameter fits easily into SUPP CTPF STEEP ETT A TTR SEPT TP SEPP EPEC ee 12V 15 Ah Battery availability Compare to EN 149 100 609 Part Voltage Current Dimensions Weight Price EN 120 620 0 16V 10 amp 8 5 x12 x 6 25 25 lbs 289 00 EN 120 600 0 30V 3 amp 8 5 x 10 25 x 6 25 11lbs 159 00 EN 120 605 0 30V 5 amp 8 5 x 10 25 x 6 25 15lbs 219 95 EN 120 625 0 30V 10 amp 8 5 x 12 x 6 25 26 Ibs 399 95 EN 120 610 0 60V 3 amp 8 5 x 12 x 6 25 18 ibs 289 95 EN 120 615 0 60V 5 amp 8 5 x 12 x 6 25 25 Ibs 399 95 Electronics Now January 1995 Save big on this rechargeable lead acid battery Has many uses computer back up upgrade alarm back up battery garden
72. leaded compo nents by hot air or thermal methods It can perform conventional thru hole des oldering and both reflow and conventional solder ing It also includes vacuum parts handling and solder paste dispensing ca pability d x D RR 7 t iS i ration Card for more de ta inr er E KARAOKE EN GAMES Cl MOUIES F music UIDEDS CIRCLE 20 ON FREE INFORMATION CARD verting the audio output will turn a CD player into a video CD player The set produces a video signal en coded in the NTSC format for broadcast TV and an au dio signal that can be played back either over TV or through a stereo system for CD quality digital Sound The audio encoder is packaged in either a 44 pin plastic leaded chip carrier PLCC or an 80 pin quad flatpack QFP The video CIRCLE 21 ON FREE INFORMATION CARD The repair system has two programmable digital controllers under closed loop temperature control The tool tip can be set at any temperature from 350 to 875 F without changing decoder is packaged in a 160 pin QFP and the NTSC encoder is pack aged in an 80 pin QFP The high volume pricing for the complete set is un der S40 Texas Instruments Incorporated Literature Response Center SC 94035 P O Box 172228 Denver CO 80217 Phone 1 800 477 8924 ext 4500 either the tip or the heater element Temperatures are displayed on a three digit LED readout The SMD 250 includes a fa
73. many input circuits as you need Con nect additional input circuits to the latch circuit via the 1N4148 diodes as shown in the sche matic The 74LS266 is au open collector quad EXCLUSIVE NOR XNOR ate One input to each 74LS266 gate is attached to one pin of the device under test DUT and the other input is attached to the same pin of the good chip A single 74LS266 can accommodate up to four inputs although only a single input is shown in the schematic When the two inputs to a 74LS266 gate are the same e g pin 3 of the DUT and pin 3 of the reference device the out put is high when the inputs differ the output is low Multiple 74LS2566 output sig nals are added together through a series of 1N4148 diodes which are connected to the latch cir cuit Only a single latch circuit is needed for the entire tester After power is applied to the tester push reset button S1 to initialize the circuit The reset MON S21004 29 3 S664 Menuer 41 Electronics Now January 1995 gt ee 2S S z TO IT i ADDITIONAL al TEST INPUT Hier TO DUT PIN 4 1 s R3 Da Rm e 4 peek l 5V t D1 1 7 14 1N4148 i 1 7 3 i i 5 _ 3302 2 l JUMPER 1 1 4 74LS266 LATCH FO OPEN S oem om Ce i i LED1 3 i REFERENCE INPUT l 1 TO O REFERENCE PIN TR i 3300 f t INPUT s CIRCUIT NS aure 5 RN J R4 2 2K 5 ic2 b 1 4 7400 4 a eee eee ee m
74. most torches including MAGUTES ond convert them to a good source of IR The filter material withstands high temp eratures and produces an output which wouid not be visible from a few meters away ond in total darkness Suitable for use with passive and active viewers 511 For the filter and the rubber lens cover All our kits are provided with high quality fibreglass silk screened and solder masked printed circuit boards FM TRANSMITTER KIT MKII This low cost FM transmitter features pre emphosis high audio giclee as it can easily ick up normal conversation in a sn room It also has excellent frequency stability Specifications Tuning range 88 108MHz ai voltage 6 12V current consumption 9V 3 5mA Pre emphasis 7545 Frequency response 40Hz to greater than 15KHz S N ratio Greater than 60dB Sensitivity for full deviation 20mV Frequency stobility with extreme antenna movements 0 03 P C B dimensions 1 x1 7 Construction is easy and no coil winding is necessary The kit includes a PCB and oll the on board components an electret microphone and a 9 battery clip SECOND GENERATION TUBES We should have a regular supply af some new USSR made 18mm 2nd Gen Fiber optically coupled image intensifier tubes approx 500 and also some used US Europeon made tubes approx 330 Some of these may require an export permit PASSIVE NIGHT VIEWER
75. on the display Anyone who wants to do profes sional level testing will probably need more than the O Scope of fers But for hobbyists and others who are still learning electronics and might be saving their money for a high performance scope O Scope offers a lot e WHAT S NEWS Electronics Industry Hall of Fame inductees Three technicians service deal ers were inducted into the Elec tronics Technicians Division of the Electronics Industry Hall of Fame on August 13 1994 George Bluze CET CSM of Largo FL Robert Vil lont CET CSM of Tacoma WA and Don Winchel CET of Smartville CA were inducted at the National Pro fessional Electronics Convention held in Portland OR Bluze served as president of the National Electronics Service Deal ers Association NESDA and presi dent of NESDA Florida He has been a test administrator for the In ternational Society of Certified Electronics Technicians ISCET since 1979 Bluze has also been NESDA Man of the Year Officer of the Year and Outstanding State President and he was ISCET Tech nician of the Year in 1982 Villont was NESDA president dur ing the association s move from Indi anapolis to Fort Worth and was the NESDA Region 10 director for sev eral years He was NESDAs repre sentative to the ISCET Board of Governors for 13 years from 1980 to 1993 and he has also been NESDA s Man of the Year Award Winchel was a board member for both NESDA and ISCET for m
76. orderis Check enclosed do not send cash O Visa O MasterCard Exp Date Signature New York State residents must add applicable local sales tax to total Lb clccc MON S21U01J129 3 GEE Menuer Electronics Now January 1995 UNIVERSAL IR REMOTE CONTROL The Fox 400 wireless infrared remote con trol works with most TVs VCRs cable and audio devices Works with all major brands and lots of not so k major brands Use it to replace lost IR remotes or to combine up to four remotes into one unit User friendly Includes complete instructions and an 800 phone help line if problems should occur Fully guaranteed Requires 3 AAA 1 batteries not included S P D T ON ON Fi Right angle pc mount 15 f 0 25 threaded bushing E Rated 5 amps 125 Vac each A s CAT MTS ART a J eu a 10 for 7 00 100 for 65 00 us D P D T ON ON ALCOSWITCH MTM206NPC Short bat handle 0 25 long PC terminals 2 5 a CAT amp MTS 82PC NT 9 VOLT 60 MA SOLAR PANEL These 6 X 6 glass enclosed photovoltaic panels produce 9 Vdc at 60 ma Ideal for charging batteries and power ing small devices Put two or more together for more cur rent and voltage Includes Foie PEN 3525 ORDER TOLL FREE 1 800 826 5432 CHARGE ORDERS to Visa Mastercard or Discover each CAT it SPL 960 TERMS Minimum order 10 00 Shipping and handling tor the 48 co
77. powerful test the signs of x and y plus the absolute lengths of x com pared to y to pick one of the eight cases The selected case is then the one that is run Assume the math coordinate ori entation rather than the geograph ical one with east at O degrees north at 90 west at 180 and south east at 315 Then call any of the eight cases an octant A vector of 10 2 miles ENE is in octant zero Now in octant zero x absolutely must be positive and absolutely must be larger than y Moreover y also must be positive Otherwise you would be in some other octant 90 in octant zero simply apply the rule always step by x and maybe step by y Assume that the corrected vec tor has been resolved into x 9 4 and y 3 9 components Since you are allowed only whole integer steps you cannot take 9 4 unit steps In this case we will round down to nine steps Thus you want nine x steps and you want four y steps The question is when to add the y steps to get closest to the original vector If rounding down gives an x value of zero exit The little missed piece will be picked up on the next vector Exiting on a zero length also gets rid of the possible divide by zero in the next step Next calculate the s ope by divid ing the little y number by the bigger x one or in this case y x Save this value Then step along your x axis al ways taking one x step After each x step compare the actual y against the desired y
78. produce 100 000 units a month accord ing to the company More than one million receivers could be sold before the service is one year old The encryption and con ditional access system chosen for DSS a completely digital system was developed by the News Datacom division of Rupert Murdoch s News Corpo ration The receiver accepts a smart card through a slot in its front panel which allows the re ceiver to decode the program ming that it is authorized for The rationale for choosing the system is that the smart card is difficult to reverse engineer yet is easy and inexpensive to up grade and replace if a security break makes it necessary In that way it is similar to VCRS However in Europe a very similar system from News Datacom provides conditional access control for the Sky satel lite service The system has been repeatedly subjected to hacks by satellite pirates Of ficials of the companies in volved remain confident that any security breaks in the DSS encryption will be repaired quickly and inexpensively What the law says Signal theft became a Federal crime under the Cable Commu nications Policy Act of 1984 Ti tle 47 USC Section 605 The Act states that No person shall intercept or receive or assist in intercepting or receiving any communications service offered over a cable system unless spe cifically authorized to do so by a cable operator or as may other wise be specifically aut
79. route is shorter and probably a lot easier A CAD CAM machine that cuts only east and then travels NEW FROM DON LANCASTER HARDWARE HACKING Incredible Secret Money Machine 18 50 The Case Against Patents 28 50 Hardware Hacker Reprints Il Ill or IY 24 50 Blatant Opportunist Reprints 24 50 Resource Bin Reprints 24 50 Ask The Guru Reprints Il or Ill 24 50 CMOS Cookbook 24 50 TTL Cookbook 24 50 Active Filter Cookbook 24 50 Micro Cookbook 19 50 Lancaster Classics Library 119 50 POSTSCRIPT STUFF PostScript Secrets lle Mac PC 29 50 Book on demand resource kit 39 50 Intro to PostScript VHS Video 29 50 PostScript Beginner Stuff 29 50 PostScript Show amp Tell 29 50 PostScript Cookbook Adobe 19 50 PostScript Ref Manual Il Adobe 31 50 PostScript Program Design Adobe 24 50 Type Font Format Adobe 15 50 Acrobat Reference Adobe 24 50 LaserWriter Reference Apple 19 50 PostScript by Example McGilton 29 50 Pgm Display PostScript with X 29 50 PostScript Visual Approach Smith 22 50 Thinking in PostScript Reid 22 50 Undst PS Pgrmmg Holtzgang 29 50 The Whole Works all PostScript 379 50 FREE VOICE HELPLINE VISA MC SYNERGETICS Box 809 RE Thatcher AZ 85552 602 428 4073 CIRCLE 205 ON FREE INFORMATION CARD The goal of vector to step conversion is to change a diagonal tool path or a slanty line on a screen or printer bitmap into discrete unit steps that travel only in north south or east west directio
80. subroutine This is where the NCO data word is converted from parallel to serial format and sent to the NCO board The easiest way to under stand whats going on here is to study Fig 2 a partial flowchart of the subroutine First the 32 bit NCO frequen cy code must be read into the board bit by bit The board is set up for most significant bit first entry of the serial data bit 32 goes to the NCO first and bit O is sent last Next long integ ers in QBASIC are stored as groups of four successive bytes in the PC s memory least sig nificant byte first most signifi cant byte last Once the memo ry location of N is known N must be read in reverse order fourth byte to first byte The Set byte count to 3 and Dec rement BY lines keep track of which byte is being processed The byte now must be scan ned from the top down that is the most significant bit to the least significant bit This is where the Set bit counter to 7 Test bit BT Set DATA to 1 or 0 Toggle Clock Decrement BT and TEST BT blocks are used The program looks at each bit of N MSB first and then decides whether the bit is a one or a zero It then sets the DATA line and toggles the cLock line sending the para bit to the NCO After each pass through the inside loop the bit test loop the bit counter content BT is tested to see if all the bits have been scanned if not the loop is completed again When a bit scan has been comple
81. the Recoton transmitter Recoton Wireless Speaker 89 9 S amp H Recoton Wireless Headphones 69 6S amp H Please mention promotional code 165 ET1104 For fastest service call toll free 24 hours a day 800 992 2966 c eo cm BH To order by mail send check or money order for the total amount including S amp H VA residents add 4 5 sales tax Or charge it to your credit card by enclosing your account number and expiration date Send to COMTRAD INDUSTRIES 2820 Waterford Lake Drive Suite 106 Midlothian Virginia 23113 1994 ANNUAL INDEX Abbreviations AUD Audio Update C Construction CC Computer Connections R D Department DB Diawing Board ED Editorial ER Equipment Reports HH Hardware Hacker LET Letters QA Q amp A WN Whats News 1993 Annual Index Jan 77 in Review Holtzman CC Apr 98 39 Laser Pointer Lancaster HH Sep 75 68705 PIC Microcontroller Programmer Beard C Jan 43 Based Experimenter s Clock Beard C Feb 59 Adding Old Fashioned Gauges to Modern Automobiles Grossblatt DB Jan 28 Adjustable Continuity Tester Kennedy C Aug 8 Adobe Acrobat System Lancaster HH Feb 73 Air Turbine Opportunities Lancaster HH Jun 3 All About Relays Marston Jun 69 LET Sep 16 LET Oct 10 Alternate Tachometer Design Takes Shape Our Grossblatt DB Oct 6 AM Interference QA Jul 10 AM Power Loop Antenna Gault C Jun 44 Amateur TV Station Build Thi
82. the country One of the most critical is what we call a tap audit function Security technicians literally walk the system and make a determina tion if anyone is connected im properly or illegally In the first instance accord ing to Astarita the illegal tap is treated as an unauthorized con nection one in which an indi vidual is receiving program ming through no fault of his own That could happen for ex ample if someone moved into an apartment and hooked his equipment up before determin ing that the prior occupant for got to contact the cable compa ny to have the service discon tinued After the programming is cut off and the connection removed a salesman will call and ask if the party would like to sub scribe If a tap audit discloses that the party is hooked up il legally a second time it is treat ed as an illegal theft The illegal connection is photographed and removed as evidence Now you are illegal says Henry Hack director of investi gations for Cablevision You have committed a crime Theft of services is a Class A misde meanor in New York State You will be sent a cease and desist letter and the security depart ment will monitor the situa tion No legal action will be taken unless the party hooks up for a second time After the sec ond offense Cablevision will in itiate either a civil action or a criminal action In a criminal action a police officer will come to the hous
83. the remote controls signal I phoned several fluorescent lamp manufacturers to see if they could shed some light on this interference Yes we have had some complaints said Scott Mack a spokesman for Philips Lighting He advised me to make sure the energy saving bulbs were at least 10 feet away from my TV set and cable box and that they were plugged into different household electrical circuits But that s the cure for radio frequency interference I pro tested what about infrared in terference He agreed with me but said that until Philips came up with a definitive solution this was the suggested response to any complaints In fact he added If those suggestions don t work try moving the ener gy saving lamps to a different room Ghost busting I connected the lamp with the fluorescent bulb to a different electrical circuit with an exten sion cord and I moved it 16 feet away from the cable box but that didn t help To prove to my self that it was infrared energy emitted from the bulb and not RFI on the line I put the lamp in a large cardboard box With the lamp turned on inside the closed box there was no inter ference But as soon as the box lid was opened the remote stopped working Next I tried a magnetically ballasted fluorescent desk lamp with an circular eight inch di ameter tube The energy saving fluorescents lamps are elec tronically ballasted The remote was unaffe
84. thelr many varia tions and countermeasures Protect yourselll 39 HIGH VOLTAGE DEVICES HV devices plans Stun Gun Taser Prod Cane Flasher Blaster Zapper AudloAFRadar Jammer Jacob s Ladder Plasma amp Van de Graaff Gens Fence Charger Gelger Counter Ozone Gen Fish Stunner Plant Stim Kirilan more All plans for only 29 UNDER ATTACK leclromagnetic Interference and Electronic Weapon Attacks cause Cancer birth defects and profound pSy chological neurological cardiovascular and immune system disorders Destructive to people animals plants equipment Includes ACTUAL CAS KS Ol PEOPLE we investigated Includes how to verify and pinpoint EMI and electronic attack sources and Spe cific countermeasures 29 EM BRAINBLAST ER Tutorial and plans for powerful ELECTROMAG NETIC WEAPONS and LAB DEVICES Optimum circulls BY waveforms duty cycles intensities Thorough 29 Bath 49 RADIONICS MANUAL Exciting electrical electronic elecromagnelic therapeu tic diagnostic amp preventive devices mostly experimen tal History descriptions plans dozens availabilities of Radionics Devices from early to modem While drugs cost Hundreds acy costs pennies 29 HEAL THYSELF Pians for 3 major electronic therapeutic devices of types approved by FDA 19 Both 39 HARD DRIVE MANUAL all hard drive and Controlier implementations fem phasts on PCs How to select Interface Initiali
85. to Port A and a four pin header P6 for input selec tion The P1 P4 jumpers allow both the common resistor legs and the common switch poles to be tied to either ground or 5 volts DC or to be disconnected from the circuit entirely If pro grammed as inputs the ports should not be left floating be cause this might cause erratic operation Connector P6 allows IC1 MC68705P3 an external device e g a com puter to drive the controller s inputs The 68705P3 requires a tew support components Crystal XTAL1 runs at a frequency of 3 58 megahertz which should not be altered Capacitor C5 loads the oscillator to keep it at the correct frequency and ca pacitor C6 keeps the reset pin low for an instant thereby giv ing the 68705 time to stabilize after power up Momentary switch S3 provides for resetting the circuit Although unused in the prototype an external con nection is provided to the mi crocontrollers RESET input which could allow an external device to reset the circuit when desired 1 a cs l XTALI c5 2 s 4 s e 7 e o io f 39 Mi IEexrAL 5 IC11 MCP3011 FIG 1 COMPLETE SCHEMATIC OF THE 68705 based power controller The controller reads switch values from Ports A and C and delivers software controlled 120 volt AC power to Port B MON S21004129 3 GEE Menuer Electronics Now January 1995 PARTS LIST All resistors are watt 5 un less otherwise noted Ri
86. to handle higher current and achieve lower ON resistance The TO 264 package is about 5096 larger than the TO 247 package but its pin spacing is identical making retrofit relatively simple The TO 264 family includes 500 600 and 1000 volt MOSFETs The prices for TO 264 MOSFETs range from 5 45 to 11 10 each in high volume purchases Motorola Inc MD Z311 5005 East McDowell Road Phoenix AZ 85018 Phone 602 244 3071 Fax 302 244 3015 FILTER DESIGN PROGRAM The Filtech filter design program from Number One systems is an aid for de signers of active and pas sive filters It can syn thesize both active and passive filters up to sixth order with a frequency range extending from frac tions of a hertz to more than a gigahertz Filtech can indepen dently analyze the syn thesized filter circuits and display a graphic plot of the calculated frequency re sponse superimposed on the specified filter limits This feature quickly con firms the accuracy of the synthesis design process The designer need only key in passband and stop band frequency limits rip ple and attenuation levels and terminating imped ances Filtech will then complete the design Filtech software com plete with a manual con CIRCLE 27 ON FREE INFORMATION CARD taining sample designs and a tutorial on filters is priced at 275 Number One Systems 1795 Granger Avenue Los Altos CA 94924 Phone Fax 415 968 9306 PLASTIC F
87. voice to lady s and vice versa 49 00 For Shipping amp Handling add 5 00 and 2 00 per item Colo residents add sales tax Mail Order VISA M C COD s o k Inquire for dealer prices Free catalog MUCH MUCH MORE OUR 25TH YEARI TOLL FREE 1 800 926 2488 A M C SALES INC 193 Vaquero Dr Boulder CO 80303 Tel 303 499 5405 Fax 303 494 4924 Mon Fri 8 a m 5 p m Mtn Time CIRCLE 108 ON FREE INFORMATION CARD Be anFCC LICENSED ELECTRONIC TECHNICIAN E mE VE t i 3 ij Learn at home in spare time 4 No previous experience needed No costly school No commuting to class The Original Home Study course prepares you for the FCC Commercial Radio telephone License This valuablelicenseis your professional ticket to thousands of exciting jobs in Communications Radio TV Microwave Maritime Radar Avionics and more even start your own business You don t need a college degree to qualify but you do need an FCC License No Need to Quit Your Job or Go To School This proven course is easy fast and low cost GUARANTEED PASS You get your FCC License or money refunded Send for FREE facts now MAIL COUPON TODAY pu ae rag eg td ME 1 COMMAND PRODUCTIONS FCC LICENSE TRAINING Dept 90 P O Box 2824 San Francisco CA 94126 Please rush FREE details immediately NAME ADDRESS CITY STATE ZIP m MON S21U0J129 3 266 Asenuer
88. volts when the O OUTPUT differential input voltage is zero However some op amps can be powered from single ended supplies Figure 4 is the frequency re sponse curve or Bode plot of a 741 op amp The 741 offers low frequency below 10 Hz voltage gain that is greater than 100 dB However that gain rolls off at 6 dB per octave 20 dB per decade at frequencies above 10 Hz It eventually falls to unity gain O dB at its f unity gain transi tion or cutoff frequency of 1 MHz The Bode plot of Fig 4 can also represent the latest op amps but those devices will tip ically have different values of low frequency gain and cutoff frequency Closed loop amplifiers The op amp usually serves as the active device in a feedback circuit Gain is precisely deter mined by the negative feedback applied from output to input though the components in the external feedback loop The val ues of those components set the gain value However the feed back loop effectively cancels the op amps open loop electrical characteristics Figure 5 shows an op amp configured as a fixed gain inver ting amplifier The output is fed back to the input and voltage MON S21U0J129 3 664 Menuer Electronics Now January 1995 60dB CLOSED LOOP RESPONSE Ay VOLTAGE GAIN dB 20dB CLOSED LOOP RESPONSE _ RESPONSE C I RESPONSE EE LI LI DL mu DL f FREQUENCY Hz FIG 4 BODE PLOT for the 741 op amp showing va
89. with a gain of 10 49V N P NONPOLARIZED FIG 9 NONINVERTING AC AMPLIFIER with a gain of 10 and 50 megohm input impedance features of special importance in certain applications such as low noise high slew rate wide bandwidth or various com binations of these Op amp manufacturers spe cialize in either the high vol ume low priced commodity or general purpose op amps jelly beans or more specialized premium priced and often pro prietary devices for instrumen tation signal processing and communications The Harris CA3140 is an ex ample of a high volume BiMOS op amp that offers very high in put impedance 1 0 x10 ohms that can operate from ei ther single or dual power sup plies The CA3140 combines the advantages of high voltage PMOS transistors with high voltage bipolar transistors on a single chip The CA3140 has a bipolar output stage is internally com pensated and has the ver satility of 741 op amps Column 2 of Table 1 lists some of its typ ical electrical characteristics National Semiconductor s LF411 is a low cost high speed JFET input op amp that is also made in volume It offers low in put offset voltage and low volt age drift A large gain band width product and fast slew rate are maintained with low supply urient High voltage input ETS give the LF411 its low in put bias and offset current It is both pin compatible and inter changeable with the 741 Co
90. 0 79 COPPER CLAD ASSORTMENT Tas G2679 5 00 Our best assortment ever Contains 25 pieces of various size copper clad circuit board blanks Each is double sided and you will receive thickness types from ultra thin to standard thickness Minimum size 2 square to a maximum of 6 square A PC board makers delighi MON S21u04129 3 GEE Menuer 1115 Electronics Now January 1995 116 n E FA E y E RO NI i S HIGH QUALITY TEST EQUIPMENT BEST PRICE DMM 89 199 95 DMM 2360 DMM 21 Fluke Multimeter Most Advanced DMM 119 95 74 95 otio All Purpose amp Communication DMM LCR Meter Inductance 1uH 40H Ei e TON 67 5 Capacitance 1pF 200 F Frequency 1Hz 1MHz Vol amp ohm diode 80 7 to 81 4 dBm with 402 12000 20 reference impedances Fluke 731 94 Very Versatile DMM Fluke 75 129 Frequency counter 0 01Hz 10MHz Capacitance 1pF 40uF 3999 count display Holster C 70 16 Capacitance 1pF 50 000uF Frequency 1Hz ite TTL logic HFE Fluke 7711 149 Measure AC volt to 20kHz ede ie mi i eso Fluke 79 169 S000 TTL c z counts 0 1 accuracy tes Rubber holster 8 00 Fluke 291 169 Diode Continuity Auto manual range fast bar graph Min Max Ave DH Relative Zoom Volt Amp Ohm Fluke83 225 M QNM to power ofi ad T Fullline of
91. 0 LINDA GENTEEL 6122 MONMOUTH VENTNOR NJ 08406 GIFT CATALOG SEND 2 00 to 4241 W Dickman Road Apt 3C4RE Battie Creek MI 49015 HIGH SCHOOL DIPLOMA Fast New Program Credit For Ex perience 1 800 470 4723 MILLIONAIRE REVEALS MONEY making secrets Send SA SE PROCUREMENT Box 425 NM Miami FL 33283 CABLE TV TURN ON CHIPS SUPER Cable TV Test Chips Provides fuli service activation Excellent instructions amp illustrations Jerroid Starcom DP V 5 DP V 7 DPBB7 Pioneer BA 5000 thru BA 6700 Scientific Atlanta 8500 thru 8600 Tocom 5503 VIP 5507 Zenith ST 1000 thru ST 5000 Call now t MASTER COMPONENTS 1 800 233 0570 INVENTIONS FREE invention package DAVISON AND AS SOCIATES offers customized development patenting and licensing for new products and ideas Proven results 1 800 677 6382 with the NEW The Fourth Edition is contained ona diskette for IBM PC AT XT compatibles DOS 2 1 or higher The disk software allows technicians to search by manufacturer for model numbers and description of part num bers A parts editing sequence gives an on screen view of all substitutes for parts en tered With the diskette the technician can update files by adding model and parts Professional level home study program Master easy to learn high profit T repairs vithout investing x in costly high tech instru j ments Send or call today Free career kit 800 223 4
92. 1 3 4 D Net weight 4 1 2 Ibs EN 125 035 videos make it Ive tit easy for Lf Oa SOKO L anyone to m CIOT comprehend Ld bus dol the complex operations of VCRs camcorders and more From How to Clean VCRs for the video rental store to Minor Camcorder Repair for the advanced service shop There is something for everyone These tapes also make great new employee orientation videos Part Description EN 505 010 EN 505 020 EN 505 025 EN 505 050 EN 505 035 EN 505 030 EN 505 040 EN 505 085 EN 505 080 EN 505 090 EN 505 095 EN 505 097 Parts Express 340 East First St Dayton Ohio 45402 Local 513 222 0173 FAX 513 222 4644 VCR 1 How To Clean VCRs VCR 2 Minor VCR Repair I VCR 3 Minor VCR Repair II VCR 4 Common VCR Malfunctions VCR 5 Diagnosing Video Heads VCR Test Patterns Alignment Tape Cam 1 Minor Camcorder Repair Microwave Oven Repair Nintendo Repair and Maintenance IBM Compatible Computer Assembly Hi Fi Alignment Test Tape Economy Test Tape The Wet Look The Wet Look is a new generation of high gloss polymers formulated especially for speakers This superior coating provides a protective coat of armor for your paper cone speakers A special U V inhibitor has been added to reduce the decaying effects of the sun s ultraviolet rays The Wet Look makes paper cones resistant to water humidity sun and salt Best of all it s easy to apply and cl
93. 1992 the sale of illegal equipment is rampant Illegal decoders are offered for sale in electronics stores through mail order companies and are even advertised in national magazines The sale and adver tisement of illegal decoders can be found throughout the coun try Will Nix who joined the Mo tion Picture Association of America MPAA in 1976 and was promoted to the title of Chief Operating Officer of the MPAA s anti piracy division participated in organizing a na tionwide effort to combat signal theft Nix left the MPAA in 1991 According to Nix at one time during the 19805 about fifty percent of the satellite decoders sold by General Instrument were being compromised by a illegal computer chips General Instrument wanted to transfer its in house anti piracy effort into a larger national effort Nix said We helped organize the Office of Cable Signal Theft OCST as a joint effort by the Satellite Communications Broadcast Association SCBA and the MPAA OCST was formed in 1986 and today is part of the National Cable Television Association in Washington D C and funded by both the NCTA and the MPAA OCST works closely with the Department of Justice the E B I U S Customs state and local prosecutors as well as law enforcement agencies through out the country OCST provides assistance to these enforce ment agencies in prosecuting criminal violators In the last three years OCST has been in volved
94. 4538 ts 2 ees 85 LF351 a n 65 74LS04 Bp 14LS224 12 95 TAHC27 34 4013 AS 4539 109 LF353 50 TAL 05 3o ALS240 59 TARC3O M 4014 9 4541 89 LE355 99 74 S06 5 T4L 241 0 65 74HC32 30 8015 ro eee B9 L956 89 ALSOT ge 24LS242 9 TAHCA2 SS a016 A3 4552 35 LE357 100 7TALSOB Jo 24L9243 69 TAHCB1 30 d017 52 4553 249 UM358 59 ALSQ3 2 90 MLS244 69 TARC73 55 4018 53 4555 79 LM359 2 09 74LS10 Fo a5 34L8245 75 74HC74 40 4019 A7 4555 39 LM376 1 39 7ALS11 35 14 9247 s F9 74HC75 a a 35 4020 aaa 53 4558 E 5s 1 69 LM380 1 09 74812 Ae H4LS248 99 74HC76 79 4021 59 4560 69 LM380N 8 1 19 FALSI r o S MLS29 129 T4HCBS 5 4022 A3 4561 200 LOB1 95 TALSIM 45 4L5251 9 74HC86 40 4023 0 4586 200 LM382 2 49 7AL 15 o 2419253 59 7AHC93 139 a024 59 4568 2 19 LM383 3 69 7AL19 47 LS256 100 74HCIO7 AS 4025 30 4569 269 LM3B4 09 74 520 p 2419257 AS TAHC109 AS 4026 79 4572 90 M3852 1 2 1 95 MLSA aee 34 LS258 55 74HC112 AS 4027
95. 49 4581 1 69 LM386N 1 69 4922 34 MLS259 69 74HC 5 4028 49 4582 169 LMa86N 3 95 TG s 34 7449260 59 TAHCT2S 55 4029 99 4584 69 LM3B6N 4 1 29 74LS27 34 4LS261 4 95 74HC1 a 59 4030 7 A31 45235 J9 LM387 1 89 54328 o A5 HL 45 74HC132 59 4032 1 39 45151 14 95 389 149 PALER oo 98 MLS273 79 TABCI33 49 4033 1 19 45155 2 95 LM390 179 PALS oc 28 24L9275 219 TAHCISI 79 a034 1 29 4702 9 95 LM391 3 95 TES do MLS279 45 74HC138 A9 4035 109 4724 1 19 L392 129 74 833 40 4L9280 69 TAHCI39 A9 4038 s 79 14174 60 LM393 45 DES wos A 4L5283 65 74HC147 89 4040 gt 63 14175 60 LM395K 9 95 Tar 1 11 38 14 290 65 TAHCI48 B9 4041 79 14409 1295 LF398 199 JALS40 35 14L9293 5 7ABCI5i 59 4042 69 14410 6 95 e 3 99 TALSA2 lt gt A5 FALS295 109 74BHC153 45 2043 A9 14411 7535 LF411 eaman 85 ARAT Lu BQ DILS298 J9 TABCIS4 129 404 79 14412 6 95 LF412 1 35 alga po 3419299 139 TAHCIS 59 4045 gt 129 14419 2 19 ZN4142 249 atsay 269 MES322 159 PABCISB 49 4046 73
96. 542 Name ___ Address Phone 2 City State Zip_ The School of VCR Repair Dept VRAM 6065 Roswell Road Atlanta G 30328 EDUCATION amp INSTRUCTION F C C Commercial General Radiotelephone license Electronics home study Fast inexpen sive Free detaiis COMMAND D 176 Box 2824 San Francisco CA 94126 ELECTRONIC engineering 8 volumes com plete 109 95 No prior knowledge required Free brochure BANNER TECHNICAL BOOKS 1203 Grant Avenue Rockford IL 61103 MAGNETIC Measurements Handbook 20 00 Free decriptive literature MAGNETIC RESEARCH INC PO Box 375 Butler NJ 07405 Learn VCR repair l The nationwide source tor cable TV equipment Why put up with Inconsistent i Color Flashes and Streaking and Interference Youn VCR CAN PLAY AS Crear as Day UNJAM NOW WITH Video Decoder Easy Connections Eliminates Jamming lt Copy any tape 2 Year Warranty RC Plugs Included DO Duy MOhey Daci Suranadi esa uc EGA ELECTRONICS save coo Erin TAREA 1005 215 Main St Winter Garden FL 34787 WANTED INVENTORS We submit ideas to industry Find out what we can do for for you 1 80 1 800 288 IDEA 288 TEST equipment wanted top price m aes ES Please send or fax your offer to HTB ELEKTRONIK Alter Apeler Weg 5 27619 Schiffdorf West Germany Fax 01149 4706 7049 The 320 page Fourth Edition o
97. 79 Electronics Now January 1995 curxpos O def curypos 0 def vectortostep findoctant exec flush def 9 4 3 9 vectortostep quit up more than half a step or 0 5 low add a y step Continue this for each needed x step That s all there is to this To review For any vectorto step conversion first correct the vector so it travels from where you really are to where you want to be Then pick one of eight octants based on the size and sign of the x and y components Then pick an octant specific code that always steps along x but only sometimes steps along y or vice versa Getting fancy There are several refinements that can be added here Testing for a 0 5 unit error becomes less accu rate the steeper the vector gets But 0 5 is more than satisfactory for most applications For the best fit use 0 5 times the cosine of the slant angle If you can t afford a real cosine 1 angle in radians 2 could sub PostScript Vector to step student demo algorithms Copyright c 1994 by Don Lancaster and Synergetics Box 809 Thatcher AZ 85552 602 428 4073 Ail commercial rights and all media rights fully reserved Additional support via GEnie PSRT Consulting services also available 96 Personal use permitted so long as this header remains present and intact Two way host recordable comm is required running output currentpoints octO 2 copy exch dup 0 eq 0 00001 add if div slope exch st
98. 80 40 20 15 and 10 meter bands in either SSB CW RTTY or SSTV modes Input drive power is 70 100 watts for full output Power input is 1200watts 115 230 vac 60 Hz Output power is 650 watts RF 1000w reduced duty cycle These units are in exceptional condition com plete with cables and connectors If your look ing for the amp opportunity of a life time you ve just checked in Price 695 00 round emblem pu CR Vi RACAL RECEIVER RA 6790 GM Superior quality and design are standard in this SO0Khz 30Mhz general coverage receiver Modes of operation are AM FM CW U LSB ISB optional with room for seven bandpass filters Theilluminated LCD display features large read able digits for frequency and mode status as well as AF or RF signal strength Tuning can be directly entered via keypad or with a tuning knob Three different gain modes are Manual Automatic and Automatic with selectable threshold Fully Checked amp Operational Price 995 00 Radio only less filters Bandpass Filters 400Hz 1 2KHz 2Khz 6 8KHz 16Khz USB LSB are 65 00 ea max 4 per unit All Prices in U S Dollars Please include telephone fax number with mail in orders Orders must be prepaid by guaranteed instrument Manuals available at extra cost CIRCLE 335 ON FREE INFORMATION CARD Zip M2H 3B4 SPECIAL FORCES RADIO SET R 1004 GRC 109 T 784 GRC 109 Its a dream come truc Complete GRC 109 radio sets including all the goodies as foll
99. AM or burnt into an EPROM for testing The secret to writing software is having some way to de bug it and 640K of RAM in a desk top PC is a good place to do that If you re locked into the idea of using a microprocessor to control your robot which is the best way to go there s no way to get around the software Contact some micro processor manufacturers such as Intel and Motorola and find out what chips are best suited for your application A microprocessor de signed specifically for control ap plications is going to be easier to use than one that s not Continued on page 12 The Four Year Electronics Degree Program That Really Hits Home Bring The Technology Home With A Bachelor Of Electronics 1 1 N DEAS dS Nows the time to prepare for a profitable career We ve lowered the cost of higher education It s true You can earn a four year Bachelor of Electronics Engineering Technology degree today and prepare yourself for a high paying electronics career without quitting your job or ever leaving your home Because World College an affiliate of tne Cleveland institute of Electronics offers you the total flexibility of indepen cent study programs proven efiective for people like you who truly want to suc ceed World College independent study lessons help you build valuable skills Mail Fax Today or Call 1 800 696 7532 step by step and expert instructors are personally a
100. AS are hacked B r While VOICE MAIL HACKING detalis how VMSs are hacked for phun and profit including VMS methods for hacking PBXs themselves PBX HACKING ad dresses ALL Issues relating to PBX hacking Including countermeasures Can your business or agency afford a 90 000 Moly fraud loss er average loss dug to hacked PBXs As described ir Forbes Magazine 39 HREAKING CALLER ID amp ANI Pians 19 KW HBR eters Experimental results 1o slow and meters ty others 19 Any 2 38 Ail 3 59 AUTOMATIC TELLER MACHINES ATM crimes abuses vulnerabilities and defeats er an 100 methods detailed Include Physical Reg Cipher PIN compromise card counterfeiling mag netic stripe false front TEMPEST Van Eck tapping spoofing inside Job super cool vibration pulse high voltage others Case histories law countermeasures detailed security checklist labeled Intemal pholos fig ures ATMs contain up to 250 000 in cashl Recent 350 000 ATM crime spree still unsolved 39 CREDIT CARD SCAMS Cardholders merchants banks suffer Bl ions in f losses annually because of credit card fraud Describes every known means of credit card fraud and scams Prolect yourself 29 CONS SCAMS amp SWINDLES ons amp scams and related Swindles fleece Amencans Ot 100 Billion per yearl The most comprehensive Sur vival manual on cons amp scams of ail kinds from the classic to hi tech Details on 100s and
101. B 1750 Starcom 6 BB 1750 Starcom 6 Chip 10 RZ V5 CFT Kit 51XX 61XX 25 Pio Kit Pioneer compatible Replaces Never Goas is 4 2999 all models 5000 6310 5503 14 5507 14 Jerrold Gl compatible The Novavision offers video pass through Replaces all models except ST 1000 ST 16XX 11 technology and a host of advanced features baseband C including parental control favorite channel memory 3 last channel recall volume control sleep timer and channel ID all controlled by a simple user friendly Motorola Chips 2999 3 menu driven on screen display system While Scientific Atlanta compatible Quick Boards CALL others talk about the future we deliver it now Only Replaces all models except 8 Wire Spider Board 1750 eO with Novavision baseband m a gt 9 ps 4 f 3 f e 7 i 4 pi _ wu FAX 1 800 854 7118 qm CIRCLE 324 ON FREE INFORMATION CARD Electronics Now January 1995 112 New and Pre Owned lest Equipment SALES RENTALS SERVICE Substantial Savings on new amp pre owned Fluke Hewlett Packard Leader Tektronix and more ELM Tal THE DIFFERENCE OSCILLOSCOPES eOMHz 2 Ch High Sens 60 MHz 3 Ch Dlyd Swp 8020 8060 8100 LDC 822 80 MHz LDC 823S 250 MHz 8 digit 1 ppm FUNCTION amp RF SIGNAL GENERATORS LFG 13008 2MHz SweepFunction Generator 10 MHz Sweep F unction Generator POWER SUPPLIES 25V 0 5A 6A 5A
102. C Greal for opening doors burgiar alarms robotics automatic voice greeting activation etc These are brand new compielely functional board assembly without case Simple barrier block connection for AC power and SPDT relay contacts hookup Size of boatd 4 x 2 1 8 THERMAL FUSE 35907 3 1 00 100 25 00 1 000 220 00 Same type found in copiers hairdryers toasters etc These handle great amounts of Current however when their temperature rating is exceeded Ihey blow out permanently tor fail safe operation This one is made by Microtemp Rated 167 C 333 F Brand new prime TRANSISTORS BY THE SCOOP Less than 1 each 1 scoop 5 00 10 Scoops about 5 000 40 00 We just purchased close to a million prime house numbered transistors made for an OEM Each is house numbered and has full length leads They are absolutely first quality not rejects We think there are Oarlingtons and small signal NPN transistors We do know that there is at least 4 different house numbers Most are regular size T092 cases however there are also a few 1 watt T092 Cases Tremendous value as we are selling them by the scoop Each scoop holds at least 500 transistors Sorry we Can t Separate them but at this price you can and you ll Save a bundle CIRCLE 241 ON FREE INFORMATION CARD SUPER POWER MINIATURE IR RANSMITTER UNIT G5535 1 25 12 12 00 120 100 00 Make all kinds of IR remot
103. D ous k 2000pF 200PF CONTINUITY TEST Zero Adjust Buzzer Eri Safet AuTo e tun L1 z JI a mcm nium eR MAL MIN VG RELATIVE pC AC o 0 a Vw Sil 1000 400 an 400 ui anf 4p Pi Lx 40008 pont fagur duf OMF Cy auto power off LCR Hz c Bm A PLE COM V Q Hz Cx Ay UNFUSEO or A TOA MAX KELVIN TRUE RMS 94 ELER 2000uF 200uF 20uF Test Socket for Plug in Components BATTERY TEST AC amp DC VOLTAGES RESISTANCE CONTINUITY TESTER Buzzer 10M ohm INPUT IMPEDANCE up to 20MH2 trom 1pF to 20uF DC CURRENT DIODE TEST ACCURACY 0 5 RDG Resolution 1uH ith 32 wi 00 counts up to 20MH2 trom 1pF to 200uF BE Stock 990122 Stock 990123 Stock 990125 Stock 990124 200 LE Technician 300 LE Auto Range 400 LE Engineer Protective Cases For Models 100 Basic 150LE 200LE 300LE Case For Model 400LE 34 9 990088 9 95 1990116 Not only does the Kelvin 94 boast alot of features the features go the extra distance If we had to run into a burning building to do some emergency trouble shooting and could carry in only one piece of equipment the Kelvin 94 would be it 0 1 ACCURACY ON DC VOLTAGES TRUE RMS on AC VOLTAGES amp CURRENT FREQUENCY COUNTER TO 20 MHz LARGE EASY TO READ 3 3 4 DIGIT LCD DISPLAY 990111 COMES COMPLETE WITH YELLOW HOLSTER PROBES BATTERY FUSE STAND CI
104. ECURITY SYSTEMS en Vee HE Amb li PA CIRCLE 339 ON FREE INFORMATION CARD McComb explains every thing you ll need to know about selecting and install ing a security system in your home or car with read ily available tools The book describes the basics of home and automotive se curity systems and ex plains how to determine which system is right for your needs System components in cluding controllers sen sors and warning alarms are explained The book also discusses self con tained home and auto motive security systems Looking Good with Cor elDRAW Third Edition by Sheldon Nemoy and C J Aiken Ventana Press P 0 Box 2468 Chapel Hill NC 27515 Phone 919 942 0220 Fax 919 942 1140 27 95 This book explains how to get the most out of ver sion 5 of CorelDRAW This updated third edition con tains hundreds of illustra tions and step by step in structions for creating at tractive graphics with Cor elDRAW 4 or 5 A section of the book covers fundamental ele ments and program calls It gives instructions for and examples of advanced techniques for construct ing those elements Icons on the screen indicate in structions that are specific to versions 4 or 5 Nemoy and Aiken offer a wealth of practical advice for producing graphics in cluding posters book jack CIRCLE 340 ON FREE INFORMATION CARD MON S21001129 3 9661 Menuer 25 Electronics Now January 1995 ets newsl
105. EE INFORMATION CARD greater waveform detail is needed Two min max func tions have been included A min max TrendPlot func tion simultaneously graphs the minimum maximum and average readings of a signal between two min utes and 30 days A min max envelope function gives a record of all changes to the displayed oscilloscope waveform displaying all the minimum and maximum values on the screen simultaneously Four Series Il models are available dual channel 99 96 and 92 and the single channel 91 An RS 232 in terface permits the printout of data from the 96 and 99 shown here Optional FlukeView software for DOS or Windows based PCs is available for the Model 99 Model 99 includes a sig nal generator for producing sinewave squarewave and component test signals lt also performs waveform calculations The Model 99 can store 10 screens 20 waveforms and 40 instru ment setups The Model 96 can store five screens 10 waveforms and 20 front panel setups The price of the Model 99 is 2195 the 96 is 1895 the 92 is 1595 and the 91 is 1295 Fluke Corporation P O Box 9090 Everett WA 98206 Phone 800 44 FLUKE Fax 206 356 5116 DATA DEBUGGING TOOLSET Data Debugging Toolset DDT software from CST Images will assist in debug ging complex data manip ulation software It is said to fill the gap between stan dard source code debug gers and generic graphic toolsets DDT provides non
106. EL READY FOR THE BEST PRICE amp SERVICE HOME TECH COMMUNICATIONS CALL TODAY 1 800 310 1157 NO TENN SALES SATELLITE TV FREE catalog Lowest prices worldwide SKYVISION 1012 Frontier Fergus Falls MN 56537 1 800 334 6455 See full page ad the Shopper section VIDEOCYPHER II descrambling manual Sche matics video and audio Explains DES Eprom CloneMaster Pay per view HBO Cinemax Showtime Adult etc 16 95 2 00 postage Schematics for Videocypher II Plus 20 00 Schematics for Videocypher II 032 15 00 Soft ware to copy and alter Eprom codes 25 00 VCII Plus Eprom binary and source code 30 00 ABE TRONICS Box 30502R Bethesda MD 0824 BUSINESS OPPORTUNITIES EASY work Excellent pay Assemble products at home Call toll free 1 800 467 5566 Ext 5192 START your own technical venture Don Lan caster s newly updated Incredible Secret Money Machine Il tells how We now have autographed Copies of the Guru s underground classic for 18 50 SYNERGETICS PRESS Box 809 C Thatcher AZ 85552 602 428 4073 Visa MC EXCELLENT extra income Assemble easy prod ucts at home Program d alc 1 800 377 6000 ext 6870 Open Sunday PLANS AND KITS 60 SOLDERLESS Breadboard Projects in two easy to read pocket books Complete with circuit descriptions schematics parts jayouts compo nent listings etc Both books BP107 amp BP113 only 11 90 plus 3 50 tor Snipping USA and Can ada only us fund
107. ETS 16 25 50 SHEETS 33 50 you do not have your own PCDATAK is supplied on one 3 5 diskette with a quick start manual by the user dot matrix printer ok approximately 75 pages In length AIRCRAFT RECEIVER KIT puts you in the pilots seat Tuneintothe exciting world of avia tion Listentoairlines big business corporate jets hot shot military pi iots local privare pilots control tow ers approach and departure radar control and other Interesting and fascinating ais band communi cations You ll hear planes up to a hundred miles away as well as all ocal traffic The AR 1 features smooth varactor tuning of the entire air band from 118 to 136 MHz effective AGC superhetrodyne Circuitry squelch convenient 9 volt operation and plenty of speaker volume Don t forget to add our matching case and knob set for a fine looking project you ll love to show Our detailed instruction manual makes the AR 1 an ideal introduction to two life Iong fascinating hobbies at once electronics and aviation AR 1 AIRCRAFT RADIO KIT 29 95 C AR CASE SET FOR AR 1 14 95 TO ORDER Call 1 800 866 6626 ORDERS ONLY Catalog requests can not be taken on toll free number 8 30 a m 5 p m EST Monday through Friday RUM OR WRITE TO LJ Ocean State Electronics P O Box 1458 Westerly R 02891 OR FAX TO CATALOG ORDERS 401 596 3590 401 596 3080 If paying by CRED
108. Electronics Repair MONEYBACK YE Call our toll free number Manual for only 59 95 5 50 shipping and i i pay by credit card and mention GUARANTEE 1 handling understand that if am not satisfied may return the B There s anraki manual within 30 day for a complete refund Supplements are this ad We ll deduct 10 K ae 1 sent quarterly for 25 per page never more than 30 and may be We ll also waive C ELECTRONICS 9 returned or cancelled at any time T oO tu shipping and handling plis Vote a x LJ My payment is enclosed O Bill me later z you If you hs wn ot O Chargemy O Visa O MasterCard S AN lt Order today for your 30 day no risk delighted simply A1 Acct No al Exp Date i returnthe manul Qi a e ITA OMNES UE TCC IAM after the 30 day Si Signature 8 E B wiped Mi Eo 2 eee m receive a i oe for all orders 9 For Faster Service Call TOLL FREE prompt refund LL S Address 2 1 800 222 WEKA Q0 5 Rm M N All payments must be in U S funds Canada add 10 Or Fax To 1 800 256 5915 CIRCLE 312 ON FREE INFORMATION CARD All other countries add 15 OT residents add 6 sales tax il to ichi d ri Ae Shelton CT 06484 Mail to WEKA Publishing 1077 Bridgeport Ave am ae Shelton CT 06484 30371 A EAD NANA S f NAA CA CA C ANANS Y 121 1077 Bridgeport Ae Electronics Now January 1995 PIIIEDEDEPEFER INDUSTRY STANDARD TEKTRO
109. Fig 2 points to one of the welds that must be removed from the microwave oven transformer With a hand held grinder very carefully grind away the welds on both sides of the transformer and separate the top core from the base Figure 3 shows a trans former that has been dis assembled Remove the wind ings from the core being careful not to disturb th insulation on the windings Discard the high voltage windings The 120 volt AC input coils from the two transformers will be used to make the isolation transformer Place both 120 volt coils back on the core of one of the transformers to form a 1 1 isolation transformer Do not disturb the insulation on the windings when reinstalling them on the core Place the windings very close to one an other to ensure satisfactory transformer coupling Some transformers have spacers be tween the coils and the core see Fig 4 that must be replaced in the correct locations Once the windings are cor ua 4 E n W FIG 2 THE TRANSFORMER for this project was made from two discarded mic o wave oven transformers a xx g z FIG 3 DISASSEMBLED TRANSFORMER 3 i EE EU Remove the windings from the trans former core being careful not to disturb the insulation on the windings Discard the high voltage windings rectly positioned back on the core reinstall the base of the transformer To do this weld the base back onto the trans former If you have
110. GEE Menuer Electronics Now January 1995 HOWLER SUBSTITUTE install a lot of office tele phone systems which often re quires that string a lot of cable It takes a long time to make sure that have the right wire going to the right frame positions was using a howler to trace lines but mine stopped working and it turns out to be an expensive item to replace Do you have some simple alternative that will do the same job and if possible provide several tones to allow me to test more than one wire pair at a time That last require ment isn t absolutely neces sary but it would save me hours of running up and down the stairs A Spiwak San Fran sisco CA Telephone line howlers are for my money too big too expensive too noisy and eat batteries at an unacceptably high rate For compa nies that are supposed to be on the cutting edge of technology some of the equipment seems to be only one step away from steam powered equipment Creating something that will help you trace cable is not only easy but is also cheap and the power re quirements are so low that the bat teries should last almost as long as their rated shelf life maybe that s a bit of an exaggeration The circuit shown in Fig 1 is exactly what you need The LM3909 is a cheap versatile IC The circuit will produce a 1 kilo hertz square wave with a peak to peak voltage equal to about 8096 of the battery voltage t will also work o
111. HH Oct 75 Signal Generator RF C Based Doberstein C Mar 35 Apr 61 Simple Test for Transformers Williams Nov 54 Software Documentation The Problem with Holtzman CC Dec 28 Solid State Disk Drive Hatten C Apr 49 Soliton Wave Rectifiers Lancaster HH Jul 71 Solving the Resistor Cube Muntz C Dec 45 Sonoiuminescence Effects Lancaster HH Mar 81 Sound Distortion QA Oct 8 Efect Generator Light Controtled Canivan C Sep 65 of Digital Compression The Klein AUD Dec 86 Pressure Level Damage Sonic Realism Klein AUD Jul 78 Sound Off s CSICOP and Audiophilia Klein AUD Oct 83 Special Effects Resources Lancaster HH Feb 73 Stepper Motors as Shaft Encoders Heckt C Feb 53 Stepper Motor Controller Cybermations SCK 2000 ER Aug 11 Suites for the Sweet Holtzman CC Mar 91 Surtace Mount Trainer Kit Elenco SM 220K Decision Maker ER Apr 16 Sweep Function Generator Carison C Dec 53 Swimming Lights QA Jan 10 Tachometer esign Approach A Different Grossbiatt DB Sep 84 Our Alternate Takes Off Grossblatt DB Oct 86 Counting Circuit Two Possible Designs for our Grossblatt DB Jun 29 Spark Counter Sectlon Completing the Grossbiatt DB Nov 86 The PLL Section of our Grossblatt DB Jul 80 Why Build A Grossblatt DB Apr 24 Take Back Control of Your Telephone Weeder C Feb 33 Jul 67 Technical Literature Lancaster HH Aug 77 Tektronix Tekmeter Portable Os
112. INFORMATION CARD RDS RDBS methods for digital data encoding and decoding Ucando videos are priced at 44 95 each Ucando VCR Educational Products Company P O Box 928 Greenville OH 45331 Phone 800 678 6113 Fax 513 548 6124 PCMCIA DIAGNOSTICS CARD The BGM64 PCMCIA diagnostic card from Boca Technology Group is a universal PCMCIA interface diag nostic tool The card can be plugged into a PCMCIA compatible slot on a com puter or peripheral to per mit the diagnosis of man ufacturing faults It can also serve as a PCMCIA prod uct hardware and software development tool Rm naso qc rt ora jum ws C Mere CIRCLE 30 ON FREE INFORMATION CARD The installed diagnostic software allows the BGM64 to test all 16 bits of data on an emulated 64 megabit address space Reads and writes through out the address space are possible The BMG64 can detect manufacturing de fects such as open and short circuits on the data and address bus Failures in status signals and inade quate power supplies can be screened before the product is shipped The BGM64 PCMCIA diagnostic card is priced at 249 Boca Technology Group 21346 Saint Andrews Blvd Suite 219 Boca Raton FL 33433 Phone 407 750 1528 Fax 407 750 8873 Q Pleated Foil Covered 1 0 Cable Assemblies 3M Elec tronic Products Division 6801 River Place Blvd Aus tin TX 78726 9000 Phone 800 225 5373 free This four page color bro c
113. IT CARD include Card No and Expiration Date Mail in orders include 4 50 shipping handing ALASKA amp HAWAII 11 00 CANADA 8 50 OVERSEAS 14 00 Minimum order 10 00 before shipping R Residents add 7 Sales Tax ORDERS RECEIVED BY 1 00 PM EST SHIP SAME DAY Catalog FREE to US Customers Canada Please send 2 00 American funds or US stamps Overseas Please send 3 00 American funds or US stamps computer technology Uses the 8085 Microprocessor erasable programmable ROM RAM with VO ports and timer Memory expandable option Built in 5V power supply 28 key keyboard lions and experiments 119 95 18 95 uw CIRCLE 260 ON FREE INFORMATION CARD PCDATAK wiit produce soldering pads for all standard components including the latest in surface mount products Custom features components may be designed easily when needed User selectable pads and connecting trace The NEW PCDATAK software from DATAK may be used on any MS DOS IBM compatible personal computer with a system minimum of a hard drive 2 megabyte tree drive space 640K RAM a high density 3 5 diskette drive and a mouse is recommended Printing does require a PostScript printer which can often be found at a local copy center i 12 077 PCDATAK software with quickstart manual 59 95 LEARN COMPUTER THEORY BY BUILDING THIS KIT DIGITAL T
114. JI99 3 GEE Avenuer 75 Electronics Now January 1995 POWER CONTROLLER continued from page 71 components Make sure that you observe polarities of all sem iconductors SIP resistors and electrolytic capacitors For the prototype four Triacs were mounted each to two 90 aluminum heatsinks The AC power input was brought to one heavy duty three terminal con nector and the eight Triac out puts plus AC common were brought to a separate nine ter minal connector The circuit board has 120 volt AC signals on it so check and double check your work before plugging in and testing the proj ect Figure 3 is a photo of the authors prototype Built in applications On power up a selection rou SOUND INPUT The accompanying schematic shows a simple circuit for letting an audio sound source control the power control ler output The circuit accepts input from a standard crystal microphone and am plifies the signal using two op amp stages The signal then passes through an emitter follower circuit that drives a TLC548 A D converter Potentiometer R10 functions as a sensitivity control The software presented below sim ply clocks the A D converter eight times accumulates the result then stores it in all eight output registers from where they are applied to the Triacs inthe usual manner To use the routine you ll have to declare the variable SDDATA add the routine itself to the jump table and add a new S1 s
115. K 2 95 i In addition to these catagories we have millions more components Chips CPUs RAMs EPROMs PALs diodes bridges MOVs resistors chokes torroids LEDs displays cables switches tools instruments and other new and surplus equipment in stock Call or write for a compiete listing Gigantic Surplus Buy Out PRICE BLOW OUT Glass Microwave Trays Vinyl Notebook Bag Large Laptop Ba Ptr aie black with black nylon with 9x9 inchy 299 y f e E ippered isnt ct ndr 1083 99 pockets inside pockets 13x133nob2 4 99 Free Miciowave Gxhe k with each tay 9x12x2 inches 9 99 12x14x6 inches 7 95 Terms and conditions of sale NO MINIMUM ORDER Mall al orders to Debco Electronics inc 4025 Edwards Read Cincinnali Ohic 45209 or call toll free 1 800 423 4499 or 513 531 4499 We accept cash checks money orders 5 S funds only VISA DISCOVER and Mastercard UPS ground shipping 5 00 1st ib 50 each additional Ib 2nd Day Air 8 50 1st ib 1 50 each add Next Day Air 17 00 tsi Ib 2 50 each add COD add 5 00 NOTE COD S SHIPPED CASH ONLY Most orders shipped within 24 hours Open accounts to qualified customers Ohio residents add 5 5 Ohio Sales Tax or subreit certificate of exemption Prices and avallability subject to change without notice Debco Electronics 4025 Edwards Road Cincinnati OH 45209 Orders 1 800 423 4499 Info 1 513 531 4499 FAX 513 531 4455 ad 49433b
116. LOCK FLOAD and ON TABLE 1 PARALLEL PORT DB25 PIN NO loooMMooBooooon C OIIE o o 0 OR Ld Eo or noes PSG COMPONENT SIDE SOLDER SIDE Oo DATA PORT BIT on D5 D4 D3 reir WEIGHT 128 6a 32 16 e BIT FUNCTION lic te ON OFF FLOAD DATA CLOCK o 3 o H9 0 4 INCHES PSG SOLDER SIDE OFF input lines couple the board to a PCS parallel port Each of the four inputs is buffered by ICl and then fed to the HSP45102 NCO chip The NCO chip is a serial input device that needs either 32 or 64 bits of data to start generating sine waves 32 bits are required for single frequency operation and 64 bits are required for dual fre quency shift keying FSK A shift clock pulse is gener ated by the PC with each data bit fed to the pata input and it is fed to the cLock input of the NCO When all 32 or 64 data bits have been fed to the NCO the rLoap line is activated and the new frequency s become available at the output of the generator The ow orrF control line turns the output signal on or off under program control The TTL compatible FSK modulation input selects one of the two programmed frequen cies to be seen at the output of the instrument For example assume the two programmed frequencies are 1 0001 mega hertz and 0 9999 megahertz A high level TTL logic 1 at the FSK input would cause the 1 001 megahertz signal to ap pe
117. Lights of America eight inch circular tube Panasonic Twin Light Capsule Lights of American eight inch circular tube Reduced THD GE Energy Choice OSRAM DULUX EL GE Soft White Reduced THD Philips Earth Light Abco Table Lamp Conversion Set Electric Saver Panasonic Light Capsule Light of America Lifelight U tube FEIT Electronic U tube Dana swing arm magnifier desk lamp with a circular tube Legend 22 100 15 60 9 60 TABLE 1 Watts Rating Model Replacement Replaces Number Tube 2022TP FC8TEX L RS 20 75 DULUXEL Integrated 1699 EB 20 75 11302 Integrated 999 18 75 SL 8 Integrated 1699 EB S tj 16 60 7430 13W 27K 19 99 uE6 ureert uses thee M Dim DN 12 60 6000 1 FUL12T60W MB 9308 MB BPMLPL9 9W 2700K ES IEEE st Scull mi Sl al BFG15LE A C A BV T iT C Viv Type JE JR O 1 2 30 115 C2080TP L FCL30EX L Ea a MT 27 100 EFD27LE Integrated 1999 EB PD LE 999 re m zm dvo Watts shows the actual wattage rating of the fluorescent unit and the manufacturer s approximation of the incandescent bulb it replaces Price is the actual price paid at the Orchard Supply Hardware store in Gilroy CA EB Electronically Ballast MB Maghnetic Ballast S Solid failure Intermittent failures and a blank indicates no failures Personal computer manufac turers have
118. ME ELECTRICAL WAREHOUSING meer n CORPORATION P O Box 8180 aBartlett IL 60103 s 800 577 8775 pg uoc bn 0S ITE S omuia SRT TA IS RUE HOURS Monday Saturday 9 5 C S T HH Y MM CABLE TV DESCRAMBLER KITS Universal Descrambler Tri Mode Descrambler SB 3 Descrambler Includes all the parts and an Includes all the parts andan Includes all the parts amp an etched amp Drilled PC Board Not etched amp drilled PC board amp etched amp drilled PC board included is AC adaptor or AC adaptor Not included is amp AC adaptor Not included eneles ure eoe 69 00 the enclosure 49 00 is the enclosure 39 00 Call Toll Free 1 800 886 8699 Visa MasterCard amp COD M amp G Electronics Inc 2 Aborn Street Providence RI 02903 It is not the intent of M amp G Electronics Inc to assist any individual to defraud any pay TV operator or to violate any state or federal laws regarding the use of the descrambler kits You must understand the kits being purchased for educational and or experimental use only CAPACITOR CLOGE OUT SAVE SO to 75 OFF RETAIL TOP QUALITY PARTS WHILE SUPPLIES LAST CERAMIC DISC ELECTROLYTIC TANTALUMI Leading subsidy book publisher seeks manuscripts of all types fiction non fiction poetry scholarly juve nile and religious works etc New authors welcomed Send for free 32 page illustrated booklet G 33 Send SASA for FREE catalog to 114 Vantage Pres
119. Malan 99 MS 2 88 MLS669 99 TAHCAOSO 59 F341 2270222 179 LM324 95 MC1358 99 TALSIBS go MLSGO BO TANCAOST 129 Gey 7 7 sig be as MC1372 2 69 L165 89 MLS674 14 95 T4HCAQEQ 79 1014 79 LM329 B5 MCt374 200 7A 8166 BS aL S682 219 74HC4O7S 49 dois 149 LMGT 829 MCMOA 1 99 TALS16 99 2LS689 2 19 744CA351 139 14546 T9 LM334 1 09 MG1405 199 UALR So 69 4LS684 169 T4dCASI1 219130077 oe ae 109 uCta06 6 1 99 TALSTIO 09 SaLS685 800 74 4CA515 269 Jeja oe E 159 MC14068 1 89 74 8174 s 49 P4LS688 2 19 741404538 79 y re r LM337K 35 MC1411 1 99 777 4 4L9689 350 744C22106 895 1226 DS7K 3 59 Masia 1 69 7415175 A5 3ALS 83 2500 460 4520 voceren 7 LM337T 99 MC1456 150 74 8181 169 5514600 Es s 106 LM308K 495 Mel438 27 74 8189 395 74HCXx 400 30 4522 99 LM33BT 2 95 Liisaa 50 TALS190 59 34H00 30 401 40 4526 89 Lu339 55 Tisai 2 00 50 74 8191 59 Z4HCO2 30 402 20 4527 90 LOK aos MM 5 74LS192 79 24HO04 30 406 59 4528 89 LMMOT 59 EMEOO 138 7ALS193 69 MHOOB 30 4007 30 4529 99 LM345
120. NIX 491 SPECTRUM ANALYZER Covers 10 Mhz 40 Ghz Solid state portable unit features intemal phase lock minimum sensitivity is 100 dBm A 12 4 Ghz mixer is included with each unit Extemal mixer kit 40 Ghz and attenu ators are available with purchase of each 491 for 400 00 extra per set Price 1 200 00 ea R390A RECEIVER The CLASSIC RADIO RECEIVER that is still a great investment These units are com plete with orig meters and cover the frequency range of 0 5 32 Mhz in AM CW MCW with direct frequency readout via mechanical digital display physically complete less covers Price 195 00 Used Repairable Just arrived R 390 s They look to be in pretty good shape no meters But still a great investment MS 00 Used Repairable A SEE www COLLINS KWM 2A TRANSCEIVER A classic HAM 100w tranceiver These units are true to the classic collins style and quality built to last more than a lifetime Limited quantity Price 595 00 with piggyback pwr supply 445 00 complete as is w pwr supply y 608 Gordon Baker Rd Willowdale Ontario Canada TEL 416 490 8865 rax 785 7955 Scientific M M a E ME TREE UI ERR eeseqeeeseesesessescesesecepgeeesescossceseseceosceqeeegeeesseeqeoou f 2 f 4 oe 4 j COLLINS 30L 1 POWER AMPLIFIER One of the finest mid size linear amplifiers ever produced specifically for the Premier Ham Radio Operator It covers the
121. OOLS New prices make PIC development more affordable ClearView In Circuit Emulators 20 MHz in circuit debugging for PIC16C5x 64 71 84 Set breakpoints step through code and modify registers Friendly DOS and Windows software 499 each separate units for 5x and xx PICs Tims CBORIAYS HL l ABERS n 1 RClearView J In Circull Emuiater for PIC 160xx PAA AX du ay PIC Programmer Hobbiest Pack Programmer for PIC1605x 64 71 74 84 ang AZ Z Documentation on disk YN N User supplied cables and power supply 3805 Atherton Road 102 Rocklin CA 95755 USA Just 99 916 624 8333 Fax 624 8003 BBS 624 7101 ClearView is a trademark and BASIC Stump amp the Parallax logo are registered trademarks of Parallax Inc PIC is a registered trademark of Microchip Technology Inc 1094A Features and prices subject to change without notice Prices are U S prices only prices in other countries may vary CIRCLE 195 ON FREE INFORMATION CARD Em n EM i E al wl rJ LI Lu swf ry ttTrvtTTUUT vrrrecerre PICiGCxx PGM PRAILAX 2 DC 2000 MHz F AMPLIFIERS In plastic and ceramic packages for low cost solu tions to dozens of application requirements select Mini Circuits flatpack or surface mount wideband monolithic amplifiers For example cascade three MAR 2 monolithic amplifiers and end up with a 25dB gain 0 3 to 2000MHz
122. OT e LU y Test Bench DMM also has frequency logic duty cycle and data hold It s even fi AS water resistant r Oe a wm Pra 179 159 139 I There s a TEST BENCH DMM to fit every application and budget Choose from three 3 digit TEST BENCH DMMS starting with the Model 388A All measure AC DC voltage or current ohms frequency logic levels and test components and continuity The Models 389 and 390 add 41 segment bar graphs for smooth peak null orlevel adjustments Min Max memory and relative modes The 390 also has a temperature probe MAXTEC INTERNATIONAL CORP 30 why yea CE ordinary DMM when Domestic and Internationel Sales you can grab a TEST BENCH See your 8470 W Cortland St Chicago IL 60635 local distributor for immediate delivery 4 312 889 1448 FAX 312 794 9740 CIRCLE 77 ON FREE INFORMAT ON CARD Electronics Now January 1995 4226 How to Build Advanced Short Wave Receivers 5 75 Practi cal construction details of a number of shortwave receivers which should have levels of performance at least equal to that of commercially built sets of similar complexity Also included are a number of add on circuits such as Q multiplier S meter noise limiter etc which can be used to aid and improve the listen er s Shortwave reception O PCP108 Comput ers and Music 9 95 The text leads you through the topics on computers and music software Learn
123. Professional Spectrum Monitor Analyzer for all serious Ham Radio and Radio Monitoring Operators just 1 3GHz E o8 JJ si Cre t RE edd de b OU a iet 19 75 Laboratory Performance FC1300 truly Accurate m The is accurate to within 50 Ohm amp 1 Meg Ohm inputs LP filter ix 10x input Att Frequency Measurement Period Averaging Time Interval External Counter Freq Ratio Hold amp Reset Functions 4 Gate times 01 to 10 Sec Tired of guess so matic Counters Ready to step up to Laboratory INSTRUMENTS CORP 3817 S CARSON ST 818 CARSON CITY NV 89701 Frequency Counter Accuracy is the 41 Frequency Counter Requirement The 200 800 counters being advertised the past few years are but toys when it comes to accuracy These guess so matic units are off 5 to 10 PPM over temperature amp time That s 6 000 13 000 Hz at 1 3 GHz SA1800C SHOWN 2295 00 1895 FULL FUNCTION SPECTRUM ANALYZER Quality amp Performance that s what ITC Spectrum Analyzers are known for 80 dB on Screen 110 dBm Sensitivity Center Frequency Display SKHz Narrow Band Filter for 5KHz resolution band width 50 MHz Marker DISPERSION ZOOM Baseline Clipper Sweep Speed Adjustable Video Filter 40dB of Input Attenuation Standard on all ADVANTAGE Spectrum Analyzer specials The SA1300B and SA1800C provide Laboratory Performance at fraction of the normal cost The SA1300B SA1800C 2 1 3GHz amp 8 1 8GHz A
124. RAINER MODEL MM 8000 Starting from scratch you build a complete Computer system Our Micto Master trainer teaches you to write into RAMs ROMs and run a 8085 microprocessor You wil write the initial instructions to tell the 8085 processor to get started and store these instructions in permanent memory in a 2816 E PROM Teaches you all about input and output ports computer timers Build your own keyboard and learn how to scan keyboard and display No previous Computer knowledge required Simple easy to understand instruction teaches you to write in machine language Upon completion of this course you will be proficient in Uses the 2816 E PROM electrically Uses the 8156C 2048 Bit static MOS Complete with lesson manual instruc 7x5 SINGLE SIDED aun ne 1 50 3 1 4 x 6 1 2 DOUBLE SIDED 1 25 SIGNAL INJECTOR TRACER KIT This handy tester s both a Signal generator and re ceiver As a generator use it to check out an amplifier stage by stage Also tests AM radio IF and RF stages As a receiver you can pin point where a defective part exists Will transmit and receive simultaneously 814 4 00 20 4 00 28 4 85 36 6 85 16 4 00 422 4 25 30 4 85 38 6 95 18 4 00 824 4 25 32 4 85 840 7 35 26 4 85 434 6 25 BIOS QR N ei esit Laser Je IV will produce p
125. RAME SPEAKER A miniature square pan cake Model S150SLA speaker from the Intervox div of ICC has an ABS plastic frame a polyester cone and a rare earth magnet It was designed as an audible signal source for modems and laptop or other small portable com puters that have internal space restrictions The S150SLA speaker has a nominal voice coil im pedance of 8 ohms a nor mal power rating of 200 milliwatts and an output sound pressure level SPL of 81 dB measured at one meter Its resonant fre quency is 550 Hz The speaker s front face mea amp 5 i B pent CIRCLE 28 ON FREE INFORMATION CARD sures 40 millimeters on a side it is 4 3 millimeters deep and it weighs 5 8 grams The S150SLA speaker is priced at 1 59 in high vol ume purchases International Components Corporation 105 Maxess Road Melville NY 11747 Phone 516 293 1500 EDUCATIONAL VIDEOS Three new educational vid eos from Ucando VCR Ed ucational Products depend on computer animation to show viewers how elec tronic devices and circuits works Each video has a playing time of one hour Understanding Fiber Op tics is a step by step intro duction to the basics of fiberoptic technology It illustrates and explains fi beroptic cables con nectors couplers splicing techniques transmitters and receivers FM Radio Parts 1 and 2 teaches the fundamentals of frequency modulation The video covers the new CIRCLE 29 ON FREE
126. RCLE 249 ON FREE INFORMATION CARD AUTO SLEEP amp AUTO POWER OFF BUILT IN TO SAVE BATTERY LIFE with Bypass SHOCK RESISTANT HEAVY DUTY CASE WITH YELLOW RUBBER HOLSTER amp TILT STAND WATER RESISTANT SEALED CASE 30 DAY MONEY BACK SATISFACTION GUARANTEE DEIDEISSTITYePE Water on DC Voltages Resistant Freq Counter to 20 MHz Meter is designed in accordance with safety requirements specified in IEC 348 UL 1244 VDE 041 1 MON S21uOJI29 4 666 Menuer 109 Electronics Now January 1995 mrs e eo WE HAVE WHAT YOU Converter only 550 MHZ Converter Wireless Remote STD HRC Switchable Last Channel Recall With built in Stealth descramblers for all Jerrold Systems except Baseband Merlin I replaces all 550 MHZ and Volume Control Systems Parental Lock out Wireless Remote Il Merlin Il replaces all Last Channel Recall models IIl Merlin Ill replaces all and PM models HIGHLANDER 6325 9 Falls of the Neuse Rodd Raleigh NC 27615 WAN J AND M ORE TVT GOLD 42 TVT MINI 42 GREEN 65 FTB 39 SA 3 43 SIP PURPLE 49 M 80 65 STEALTH 50 SA 3DF 69 Please call for 20 and 50 piece prices Zenith ST 1600 239 Tocom 5503 239 Pioneer 6300 319 Pioneer 6150 299 All prices are for 10 pieces subject to change without notice Some quantities may be limited 30 Day Money Back Guarantee One year parts and labor warranty Starcom 7 B
127. Research Toois and Refilling Canon EX Toner Cartridges Aug 77 Powertul New PIC Software and More Dec Hackers Data Exchange and More Feb 73 Multimedia Resources 2nd More Jan 80 Second Law Violations and Hacker Opportunlties Jul 71 Tough Audio Amplifiers and More Jun 83 Jukebox Resources and More Mar 81 RBDS Services and More May 75 More on Dowsing Nov 71 Major SETI Developments and More Oct 75 Cold Fusion Update and More Sep 75 Helical Resonators Lancaster HH Nov 71 Hewiett Packard HP 970 Series Multimeters ER Dec 18 Home Control Power Line Modem for Keefe C Mar 57 Human Powered Vehlcles Lancaster HH May 75 Identifying Capacitors QA May 10 Impedance Matching QA Apr 10 LET Jul 16 Mystery QA Sep 8 Invention Marketing Scams Lancaster HH Jun 83 ITT Pomona Logic Scope Probe ER Feb 20 Jameco Electronics JE725 Digital Ciock Kit ER Nov 14 Joys of Audio Clipping The Klein AUD Sep 82 Jukebox Resources Lancaster HH Mar 81 Keeping Up Your Technical Skills Steckler ED Mar 6 KITS Jameco Electronics JE725 Digital Clock Kit ER Nov 14 Elenco Electronics SM 220K Decision Maker ER Apr 16 L Com DXB65 Ethernet Cable Tester ER Jun 19 Laser Service Manual Lancaster HH Nov 71 LED Head The Sonntag C Jul 41 LETTERS D Jan 16 Feb 16 Mar 18 Apr 12 May 12 Jun 14 Jul 16 Aug 12 Sep 16 0ct 10 Nov 8 Dec 12 LCR Bridge B K Precision ER Sep 22 Light Controlled Sound Effect Generat
128. SWEEP FUNCTION GENERATOR FG 140 MULTI METER 2MHz Function Generator 2MHz Sweep Function Gen w Freq Counter 1 06Hz Frequency Counter High Resolution Reg 249 1 49 00 02 Hz 20MHz FG 150 Esau FC 200 e 1 0Hz 1 0 GHz es 8 Di i e Sine Square Reg 399 00 e Sine Square Reg 399 209 00 Mem i list Pulse me nasi EE DES w e Auto amp Manual Ramp Skewed o 9 ee a Range Sine BEEN ww ewe irs i O ew IR 4 Selectable Gate VCF Symmetry Pp s SSS eT ero zu Sweep U fa Dd B m UE g ars Times Y Variable DC aT ee a nl e 10 MHz Freq waa 1MQ amp 500 Input Offset Control Counter Impedance AG 350 Audio Generator fes 199 119 00 PS 500 DC Power Supply Reg 249 1 59 00 PS 540 DC Power Supply fes 399 289 00 OS 3304 Re 499 339 00 e DC to 25 MHz Dual Channel e 6 Rectangular CRT with Internal Graticule 10x8cm Phillips P31 Uncalibration LED e High Sensitivity 1 mV div to 20V div X Y modes Z Axis intensity modulation e Rise time 14n Sec or less Full TV Trigger for TV V amp TV H Acceleration Potential 2kV OS 3324 Reg 599 399 00 Power 115 230V AC Triple DC Power Supply SVDC 12 VDC 12VDC 0S 3344 5 Function 1 2 8 os3324 4 Frequency Counter 100MHz 7 Digit LED Display 5 Functi
129. T One transmitter and one receiver 32 odditional transmitter 19 4 CHANNEL UHF REMOTE CONTROL KIT Two transmitters ond one receiver 68 ELECTRIC FENCE KIT PCB and components 28 GARAGE DOOR GATE REMOTE CONTROL KIT Tx 13 Rx 56 LASER BEAM COMMUNICATOR KIT Tx Rx plus IR Loser 39 PLASMA BALL KIT PCB and com ponents kit needs ony bulbs 18 HIGH POWER IR LED S 880nM 30mW 12deg 100mA 10 for 6 OATLEY ELECTRONICS 9 LANSDOWNE PDE OATLEY SYDNEY NSW AUSTRALIA 2223 PHONE ORDERS East Coast between 7 pm and 2 am West Coast between 4 pm and 11 pm 011 61 2 579 4985 JA FAX ORDERS 011 61 2 570 7910 Mastercard Visacard American Express Card with Telephane or Fax Orders International Bank Drafts and Money Orders with Mail Orders If possible include contact phone and fax numbers MON S2100J129 3 664 Menuer 113 ATTENTION CABLE VIEWERS CABLE VIEWERS get back to your BASIC Cable Needs Call 800 577 8775 For information regarding all of your BASIC cabie needs 5 GOOD REASONS TO BUY OUR FAR SUPERIOR PRODUCT PRICE EFFICIENT SALES AND SERVICE WE SPECIALIZE IN 5 10 LOT PRICING ALL FUNCTIONS COMPATIBLE WITH ALL MAJOR BRANDS ANY SIZE orper FILLED WITH SAME DAY SHIPPING 4 JA S a rem We handle NEW equipment ONLY Don t trust last years OBSOLETE and UNSOLD stock L ovn Rete mars ai COMPETITIVE PRICING DEALERS WELCO
130. T SPECTRUM Visible tight occupies only a small part of the electromagnetic spectrum It is generally considered to span the range of wavelengths from 380 nanometers violet light to over 700 nanometers red light These limits are also be 2x pressed as 0 38 to 0 70 micrometers Infrared remote controls based on readily available infrared emitting LEDs IREDs emit at wavelengths of about 1000 nanometers 1 micrometer in the near infrared region The light emission specectrum from a fluorescent tubes depends on the phos phor coating inside the tube About 90 of its energy is converted to light with the remaining 10 96 dissipated as heat in frared radiation The light spectrum il lustrated is for one of the most common white fluorescent lamps that emit a more natura light than earlier tubas The fluorescent spectral distribution curve closely brackets the visible light spectrum An incandescent bulb by contrast is only about 10 efficient Most of the remaining 90 96 of the energy is dissi pated as heat in the near infrared region Its spectral distribution extends beyond 2800 nanometers It s not the intensity of infrared racia tion that interferes with remote controls Its the frequency of the modulating sig nal applied to the neon tube Elec tronically ballasted fluorescent lamps can overwhelm a remote control by pro ducing a stronger signal tuned to the infrared receiver circuit s frequency This assum
131. The new technology provides static free interference free sound in virtual ly any environment These speakers are also self amplified they can t be blown out no mat ter what your stereo s wattage Stereo or hi fi you decide These speak ers have the option of either stereo or hi fi sound You can use two speakers one set on right channel and the other on left for full stereo separation Or if you just want an ex tra speaker in another room set it on mono and listen to both channels on one speaker Mono combines both left and right channels for hi fi sound This option lets you put a pair of speak ers in the den and get full stereo separation or put one speaker in the kitchen and get com plete hi fi sound These wireless stereo headphones have built in receiver Factory direct savings Our commitment to quality and factory direct pricing allows us to sell more wireless speakers than anyone For this reason you can get these speakers far below retail with our 30 day Dare to Compare money back guarantee and full one year man ufacturer s warranty For a limited time the Recoton transmitter is only 69 It will operate an unlimited number of wireless speakers priced at 89 and wireless headphones at 59 each Your order will be processed in 72 hours and shipped UPS Recoton Transmitter you must have a transmitter to operate speakers and headphones 69 7 S amp H Wireless products compatible with
132. Two operating voltages are re quired for this circuit to work 5 volts and 5 volts Both voltages are derived from a 9 volt AC to DC adapter The 5 volts is supplied by an LM7805 voltage regulator A National Semiconductor LM2574 switching regulator generates the 5 volts Diode D4 in series with the regulators protects the board against accidental power supply reversals The 5 volt supply must provide about 200 milliamperes so the LM7805 should be fitted with a heat sink The 32 megahertz oscillator could have been built with dis crete components for a few dol lars less than the clock module IC4 that is specified However 32 megahertz oscillators can be cranky at times and they tend to be noisy By contrast the module specified is small and quite reliable Programming The PC must manipulate four control lines for the PSG to work The cLock line is a PC simulated shift clock for moving data on the para line into the NCO buffer The rLoap line transfers data from the NCOS input buffer to its active regis ters and the ovorr line turns the PSG output on and off The four control lines correspond to the first four lines of the parallel port data register as shown in Table 1 To program the PSG first MON S2100JI29 3 GEG Menuer Electronics Now January 1995 1 NCO FREQUENCY CODE SET BYTE COUNTER TO 3 BYTE COUNTER VALUE BY RECALL BYTE BY SET BIT COUNTER TO 7 BIT COUNTER VALUE
133. U S based on the covenants we have with the Hollywood stu dios Because cable program mers lack distribution rights in the Caribbean area their anti piracy efforts are hindered According to Powers the Ca ribbean Cable Association is lobbying the MPAA in Hol lywood to allow the program mers to distribute outside the U S The MPAA has thus far not granted distribution rights be cause of its release schedule for new movies The release sched ule is a marketing umbrella whereby new movies are re leased first to the U S theaters then to the foreign theater mar ket before being released for videocassette distribution ca ble television and network tele vision This prevents a movie from appearing in the theaters and on videocassette or cable television at the same time Direct broadcast satellites In October of last year a new satellite service was rolled out nationally the RCA Digital Sat ellite System which broadcasts digital video and audio signals from high power direct broad cast satellites DBS The three major players responsible for the launch are RCA Thomson Consumer Electronics DirecTV a unit of General Motors Hughes Electronics and MON S21J04129 3 664 Avenues Electronics Now January 1995 38 United States Satellite Broad casting U S S B a division of Hubbard broadcasting The DSS rollout has been enormously successful so far with RCA selling virtually all the hardware it can
134. Your only obliga tion is to purchase 3 more books during the next 2 years after which you may cancel your membership at any time Putlisher s price shown 1995 EEBC tJ Popular Electronics Enc sie Ch fia of ELEC Book No 5489C Hardcover If coupon is missing write to Eiectronics Engineers Book Club Blue Ridge Summit PA 17294 0860 ELECTRONICS ENGINEERS BOOK CLUB WEN Blue Ridge Summit PA 17294 0860 Y ES Please send me The Encyclopedia of Electronic Circuits Vols 1 2 amp 3 5489C billing me 9 95 plus shipping handling amp tax Enrcil me as a member of the Electronics Engineers Book Club according to the terms outlined in this ad If not satisfied may return the books within 10 days and have my membership cancelled Name m M ig Address mo cem o rr E E City State Zip Phone Valid for new members only subject to acceptance by EEBC Canada must remit in U S funds drawn on U S banks Applicants outside the U S and Canada will receive special ordering Instructions A shipping handing charge amp sales tax will be added to ali orders RPIF195 MON S21u0J129I3 GEE Avenue Electronics Now January 1995 an LLOLPLQLILIIZRLAELIIB DLL LL OKLLLOO QUELZGL LUL TGLULI ONGLILILLE ULJMDBEBIR LKL G GEALALGILOOCCEEIIX UIISLLLaLAA bLAZECO SLLDLLOIQRL beul AP AAPAFcAULLLLAa SS See p CIRCLE 22 ON FR
135. a neously with measurement values It is not necessary to switch to oscilloscope mode to see a signal wave form view of a signal unless Take this GIANT CIRCUIT LIBRARY for only 9 95 when you join the Electronics Engineers Book Club THE ENCYCLOPEDIA OF ELECTRONIC CIRCUITS Vols 1 2 amp 3 by Rudolf F Graf Hundreds of circuit ideas alphabetically arranged from Alarm circuits to Zero crossing detector circuits _includes schematics for the latest electronics circuits from industry leaders Turn to this comprehensive circuit ibrary for hundreds of oroject ideas aluable troubleshooting and repair tips and concise pinout diagrams and schematics In each volume you ll find more than 700 electronic and integrated circuits and 100 circuit categories right at your fingertips to give you ideas you can use on the job or at your workbench 2 344 total pages 3 490 total illustrations As a member of the Electronics Engineers Book Club you ll enjoy receiving Club bulle ins every 3 4 weeks containing exciting offers on the latest books in the field at savings of up lo 50 off of regular publishers prices If you want the Main Selection do nothing and it will be shipped automatically If you want another book or no book at all simply return the reply form to us by the date specified You ll have at least 10 days to decide And you ll be eligible for FREE BOOKS through the Bonus Book Plan
136. access to an electric welder and know how to use it do this yourself Other wise take the transformer to a welding shop and let a skilled welder do the job for you Re gardless of who does the weld ing make sure that the trans former core does not get too hot and that sparks from the welder don t burn the insulation on the coils Check the completed trans former with an ohmmeter to make sure that there are no short circuits to the core and from coil to coil Test the trans former by connecting a volt meter to the leads of one coil designated as the output coil Connect the leads from the other coil to an AC line cord through a 5 ampere fuse Insu late all exposed connections Power up the transformer just long enough to get a read ing on the voltmeter Record the output reading disconnect the AC power and reverse the input and output coil connections Repeat the procedure and check the output voltage again Deter mine which output coil voltage measures closest to 120 volts AC it will be the output side The prototype transformer had a lower voltage reading in one direction than in the other Construction This project requires a sturdy metal case that measures ap proximately 14 x 7 x 9 inches to hold both the fan and the transformer and still have room for all connections This project consists of only a few parts so point to point wir ing can be used throughout Figure 5 shows the inside of the
137. action design than is obvious As always comments are welcome email kn acm org 0 RBRBRBRBRBRBRBRBRBRBRBRBRBRBR BH BRBRBRBRBRBRBRBRBRBRBBRRRRRREEER VIDEO NEWS nounced that it will develop a rec ordable version next year The TDK system will be a write once type and is claimed to be much cheaper than proposed multi recordable systems which can erase and rec ord many times TDK says that its write once system also will be much cheaper than rewritable types that use phase change technology e Multimedia camcorder Building on the success of its View cam which combines an LCD monitor screen with a camcorder Sharp has introduced a new version that doubles as a communications device Sharp is calling it the first multimedia camcorder The new top of the line Viewcam contains a four inch LCD color monitor with ex cellent resolution It has connectors built into its base so that it can be placed on a stand included with the camcorder that connects it to a TV for playback But that s not the only use for the connectors in the bot tom of the machine The camcorder also docks easily onto an extra cost Viewcamteleport that has a built in telephone jack Also in the tele port is a solid state memory device capable of storing 10 sti
138. ally you want to go from where you thought you were to where you want to be But you probably are not where you thought you were Why Because roundoff errors will change your actual posi tion from your desired position If you do nothing about these errors they will accumulate on you That s one reason why you should take to pographical maps with you on a hike Instead you ll correct the input vector so that it routes from where you know you now are to where you want to be This calls for a measurement or else a transform from existing device space back into user space The net result is that the input vector will change slightly in size and direction thus swallowing previous position er rors and correcting on the fly There are eight possible vector to step cases each can end up alike but different somehow Let s call east west the x and north south the y components Now x could be positive or negative and y could be positive or negative Moreover the length of x can be greater or less than that of y The next step is to decide which of the eight cases you have Then pick the correct case and use it for the actual conversion If your com puter or microcontroller and the available processing time allows you the luxury of real trigonometry you could find the arctan or angle whose tangent is and then divide by 45 to get a O to 7 case When speed is essential Cor if your microcontroller isn t very
139. amantly opposed to anything that cannot be explained by existing physical science 2 The committee picks on the weak absurd and vulnerable re ports of the paranormal and ex poses and ridicules them as they should But it implies that there are no reports worth investigating which is untrue 3 Evidence must be physical Thousands of people have testified to the reality of myriad paranormal phenomena it has generally been non conflicting testimony that would be accepted in a court of law Yet the CSICOP calls such testi mony anecdotal not repeatable hallucination or worse yet fraud It is just such narrow minded peo ple that now make up CSIOP pro fessors intellectuals and scien tists who have cried impossible and tried to prevent the introduction of any fundamentally new ideas in the fields of politics religion medi cine and science BENSON BOSS Deming NM 0 5119 The DMM LCR Meter Frequency Counter All in One component Verify poorly marked parts test for toler new DM27XT is not only a full Ag function DMM but also capacitance and frequency measurement capabilities 10 Q to 2000 MQ 10 pF to 2000 pF e Autoranging frequency meter 10 Hz to 20 MHz Measure It All roubleshoot down to the component level any laeso ances and damage Wavetek s 7 includes complete inductance i e Wide LCR range 100 pH to 20 H e Ac and dc current to 20 A e Logic test diode test max read
140. amplifier for less than 4 50 Design values and circuit board layout available on request It s just as easy to create an amplifier that meets other specific needs whether it be low noise high gain or medium power Select from Mini Circuits wide assortment of models see Chart sketch a Simple inter connect layout and the design is done Each model is characterized with S parameter data included in our 740 page RF IF Designers Handbook All Mini Circuits amplifiers feature tight unit to unit repeatability high reliability a one year guarantee tape and reel packaging off the shelf availability with prices starting at 99 cents gi 99 Sed Mini Circuits monolithic MAR MAV Mav MAR VAM RAM amplifiers for innovative M SM do it yourself problem Solvers Models above shown actual size a L A Sa P O Box 350166 Brooklyn New York 11235 0003 718 934 4500 Fax 718 332 4661 Distribution Centers NORTH AMERICA 800 654 7949 e 417 335 5935 Fax 417 335 5945 fron 9c Unit price 25 qty C PLASTI VAM 3 VAM 6 VAM 7 SURFACE MOUNT 1 45 1 29 1 75 add suffix SM MAR 1 MAR MAR MAR 4 MAR 6 MAR 7 MAR 8 to model no 1 04 1 40 1 50 1 60 1 34 1 80 1 75 ex MAR ISM MAV 1 MAV 2 MAV 3 MAV 4 MAV 11 200345 1 45 155 165 2 15 CERAMIC RAM 1 RAM 2 RAM 3 RAM 4 RAM 6 RAM 7 RAM 8 SURFACE MOUNT 4 95 4 95 4 95 495 495 495 495 PLASTIC MAV 1 MAV 2 MAV 3 MAV 4 MAV 11 FLAT PACK 1 10 1
141. ansistor Q2 2N4403 PNP transistor Other components Ji male DB 25 jack J2 J3 BNC jack L1 390 uH choke Renco No RL3901 or equivalent Miscellaneous Four foot length of five conductor cable four hex spacers and screws for PC board feet clip on heat sink for TO 220 case PC board 9 volt DC adapter solder Note The following items are available from R J Portugal 52 Susan Lane North Haven CT 06473 e PC board 20 00 e Parts kit including the PC board board mounted compo nents does not include any of the Miscellaneous parts listed above or jacks J1 J3 64 95 e 5 25 Inch 1 2 Meg floppy dis kette containing QBASIC source program 12 00 Please add 3 50 for S amp H on continental USA orders AII others add 5 00 Make checks or postal money orders pay able to R J Portugal emitter follower Q1 and Q2 and C8 The final RC section consists of R10 R11 and C4 With the values shown in Fig 1 the NCO generates a relatively constant 5 volt peak to peak signal into an open circuit from O 1 hertz to 5 megahertz At 10 megahertz the output ampli tude is down to 3 volts peak to peak The impedance seen looking into the joined emitters of the two transistors Q1 and Q2 that make up the simple complimen tary emitter follower output driver is about 11 ohms The 39 ohm resistor R17 in series with the output terminal sets the output impedance seen by the load to 50 ohms
142. ar at the output while a low level TTL logic O would cause the 0 999 megahertz signal to show up at the output The switching delay between sig nals is six clock pulses in this case 187 5 nanoseconds The FSK input is held high by 100K resistor R6 to ensure that the first 32 bits of input data activate the NCO The FSK in put is protected from negative voltages by D1 and voltages in excess of 5 volts by D2 When the NCO has received valid data it computes the loca tion of the sinewave amplitudes stored in ROM needed to gen erate the output signal For ex ample if a 1 megahertz sine wave has been requested the NCO computes the location of the 32 amplitude values neces sary to make up the 1 mega hertz sinewave Fe Fo number of amplitude values and then sends the binary val ues in a 12 bit format to 12 out put lines at a 32 megahertz rate every 31 25 nanoseconds A digital to analog converter DAC connected to the NCOs output lines converts the ampli tude values to analog voltages A 12 bit 31 25 nanosecond set tling time DAC is needlessly ex pensive so an 8 bit DAC is substituted The DAC s vertical MON S21u01 29 3 664 Menuer Electronics Now January 1995 resolution better than 0 4 is adequate for this application The amplitude of the DAC output signal is controlled by R7 while the sinewave DC zero level is set by R9 The DAC out put O to 5 volts unloaded must be level shifted
143. arlight illumination We supply a three stage fiber optically coupled image intensifier tube EHT power supply kit and sufficient plastics to make a monocular scope The three tubes are supplied already wired and banded together 1 90 for the 25mm version 3 20 for the 40mm version We con also supply the lens 100mm f2 50 ond the eyepiece 12 which would be everything thot is necessory to make an incredible viewer ST FOR SHIP EXPRESS IS 15 25 PING MOST MIXED ADVERTISEMENT BY IR TANK SET B Na A set of components thot can be used to make o very responsive Infra Red night viewer The matching IR tube lens and eyepiece sets were removed from working military quality tank viewers We also supply a very moll EHT power supply kit thot enobles the tube to be operated from a small 9V battery The tube emloyed is probably the most sensitive IR responsive tube we ever supplied The resultant viewer requires low level IR illumination Basic instructions provided For the tube lens eyepiece and the power supply kit When ordering speci preference for a wide angle or a telescopic objective lens IMAGE INTENSIFIER TUBE AND SUPPLY These are the key components needed for making a PASSIVE NIGHT VIEWER The small prefocussed Russian image intensifier tube cnly requires o low current EHT power supply to make
144. ary 1995 B Bank O Data in ispGDS22 Data Al AQ SDE AS M a5V AS AG OAT SEL AQ AS ATO out Mode in A Bank I O AO m oem no roca ll A3 0 Cell E a 08 vocet amas Mp E N A7 i O Cell ne oes Lnd s ocal AT I O Cell qe a S 8 2 ana d CLEERELL LI T L EISE bd de ee PROGRAMMAB LE SWITCH MATRIX eee EET Lp 8 8 z 3 GI IO POY 0 eo oj j 9 ge O 0 N ec d co a e Bank B FIG 5 A GENERIC DIGITAL SWITCH from Lattice Semiconductor offers medium density programmable interconnects lightens it up any Do this in a room where a kilowatt of heat can be safe ly dissipated And of course keep fingerprints away Other solutions are to design a new lamp technology specifically for the new green energy cycles or go to some type of PTC self regulation Programmable interconnects The next logical progression beyond programmable integrated circuits is fully programmable sys tems in which all of the conductors between ICs can be conveniently and quickly rearranged Obvious uses that come to mind are for breadboarding development and field upgrades An ideal interconnect would be dense and cheap allowing arbitrary connection of any function any where Connections would permit analog or digital signals to move out in either direction without delays Both the on resistance and any crosstalk would be very low and these devic
145. as microsizing and compensating for tool paths and diameters How can you use PostScript s graceful curves and fancy lettering Curves are simply broken down into a lot of individual straight line vec tors which are short enough to meet your accuracy goals PostScript s charpath and flattenpath operators are used for curve to vector con versions More examples of vector to step conversions are given in my POSTVECT PS FLUTWUMP PS and FLUTOOLS PS on GEnie PSHT l ve also got some exciting new products in the works that are based on these concepts Give me a call if you need advanced details or help with your own project The halogen cycle l ve received several helpline calls about early fusion lamp failures on PROGRAMMABLE INTERCONNECT RESOURCES Aptix 2890 North 1st St San Jose CA 95134 408 428 6200 Atesla 2890 North First Street San Jose CA 95134 408 428 6250 EDN Magazine 275 Washington St Newton MA 02158 617 964 3030 EE Times 600 Community Drive Manhassat NY 11030 516 365 4600 Electronic Component News 1 Chilton Way Radnor PA 19089 215 964 4345 Electronic Design 611 Rt 46 West Hasbrouck Heights NJ 07604 201 393 6060 Electronic Products 645 Stewart Ave Garden City NY 11530 516 227 1300 I Cube 2328 C Walsh Avenue Santa Clara CA 95051 408 986 1077 Lattice Semiconductor 5555 NE Moore Court Hillsboro OR 97124 Despite the fancy name a quartz halogen lamp is still f
146. assified advertising you wish your ad to appear For special headings there is a surcharge of 25 00 Plans Kits Business Opportunities For Sale Education Instruction Wanted Satellite Television Special Category 25 00 PLEASE PRINT EACH WORD SEPARATELY IN BLOCK LETTERS No refunds or credits for typesetting errors can be made unless you clearly print or type your copy Rates indicated are for standard style classified ads only See below for additional charges for special ads Minimum 15 words 1 2 3 4 5 6 7 8 9 00 ELE io ido 14 15 4650 16 49 60 17 52 70 18 55 80 19 58 90 20 62 00 21 65 10 22 68 20 23 71 30 24 74 40 25 7750 26 80 60 27 83 70 28 86 80 29 89 90 30 93 00 31 96 10 32 99 20 33 102 30 34 105 40 35 108 50 We accept MasterCard and Visa for payment of orders If you wish to use your credit card to pay for your ad fill in the following additional information Sorry no telephone orders can be accepted Card Number Expiration Date Signature Please Print Name IF YOU USE A BOX NUMBER YOU MUST INCLUDE YOUR PERMANENT ADDRESS AND PHONE NUMBER FOR OUR FILES ADS SUBMITTED WITHOUT THIS INFORMATION WILL NOT BE ACCEPTED CLASSIFIED COMMERCIAL RATE for firms or individuals anng commercial products or services 1 55 per word prepaid no charge for ZIP code MINIMUM 15 WORDS 5 discount for same ad in 6 issues w
147. ave added a popular eleventh test here When you ve been at the re search game for a long while the pseudoscience stuff becomes pain fully and laughingly obvious corre spondence like those dreary chain letters that spend five pages telling you they are not chain letters Aaseng is much more specific be cause he lists ten crucial tests to tell the differences between pseudos cience and real science l ve re produced the list here as Fig 1 The only thing l d personally add to his list is Science requires that ex traordinary claims demand ex traordinary proof A second book with the theme of pseudoscience trashing is The Hun dredth Monkey edited by Ken Frazier Prometheus Books 1991 It discusses psychic phenomona and related wonderments Magnetic Measurements Hand book is a 95 page self published book by J M Janicke and offered by Magnetic Hesearch Included in the book is hard to find information on magnetic fundamentals along with a lot of construction projects for fluxmeters Helmholtz coils and other similar stuff In addition to publishing Magnet ic Research also sells fluxgates and Hall effect probes However the Hall effect probes are totally un suitable for most compass bearing and navigation applications The same goes for its abysmal batch of magnetoresistors Today a fluxgate compass is the only way to go A competing low cost source for flux gate coils useful for homebrew compass projec
148. ay 10 Toner Cartridge Reloading Lancaster HH Aug 77 LET Nov 8 Transformers Simple Test for Williams Nov 54 Transistor Circuits Practical Marston May 57 Transmission Line Use Lancaster HH Sep 75 TubeHead Build the Simonton C Jun 33 Tunable FM Antenna Booster n C May 49 LETI 16 Shortwave Antenna Wecke C ul 60 Aug 31 TV Commercial Editor Hurst C Two Possible Designs for our Tachometer s Counting Circuit Grossblatt DB Jun 29 U Upgrade Your Car Stereo Splwak V VCR Hard Drive Backup QA Sep 8 VIDEO SEE ALSO VIDEO NEWS Amateur TV Station Sheets amp Graf C Jul 31 Aug 39 Driver Circuits Lancaster HH Sep 75 New Age of Satellite TV The Fenton Apr 33 VIDEO NEWS Lachenbruch D Jan 8 Feb 8 Mar 12 Apr 8 May 8 Jun 8 Jul 8 Aug 6 Sep 6 Oct 6 Nov 6 Dec 6 Mar 52 Vintage Radio Knight Jan 63 LET Apr 12 LET Jun 14 Vision of the Future A Holtzman CC Aug 16 Voice Messaging Circuits Lancaster HH Feb 73 Wave Shaping Marston Jan 70 Wavetek BDM40 Benchtop Digital Muitimeter ER Jul 20 Weather Satellite Images Receiving Brandli Aug 53 What is an Operating System Holtzman CC Nov 90 WHAT S NEWS D Jan 6 Feb 6 Mar 8 LET Aug 12 Apr 7 May 6 Jun 6 Jul 6 Aug 4 Sep 4 Oct 4 Nov 4 Dec 4 Why Build a Tachometer Grossblatt DB Apr 24 Why Microsoft W ll Win and IBM Will Lose the OS War Holtzman CC Oct 89 X Y Plotter Brown C May 57 MA We MON S21UO
149. aybe electronic basics Synergetics somebody who doesn t know bet For Free Information Package Send Coupon to Box 809 ter is handling the lamps during as Foley 3elsaw Institute 6301 Equitable Road Thatcher AZ 85552 sembly or service But have the aM s uo 602 428 4073 Canon EX laser engines such as the 4M or Pro630 The symptom of the failure is a darkening of the bulb before it burns out Well have some theories here A quartz halogen lamp located in side the bottom roller intermittently turns on and off It heats the roller to a regulated 375 F temperature following hunch That green lower energy operation of new laser printers is dead wrong for the halogen cycle The worst thing you can do to a quartz halogen lamp is to cycle it repeatedly Here are some possible solu tions Run the lamp continuously for an hour every now and then outside of the printer perhaps even at 120 of rated voltage See if that VCR Check One Box Only pepuhi ch VCR Repair Dept 62243 HighPaying L Computer Repair Dept 64143 Camer _ TV Satellite Dish Dept 31039 Field advance VCR Repair Dept 65029 FOLEY Camcorder Repair Dept 66039 C Fax Repair Dept 67039 Since 1326 Printer Repair Dept 68038 Address City CIRCLE 182 ON FREE INFORMATION CARD Name 0 0 MON S21u04129 3 GEE Menuer Electronics Now Janu
150. ayer canhoid or draw 0 5 cards etc Each game features music for winning hands Compact fun game for hours of fun In retail blister pack For Phone Orders Call 602 451 7454 Or Fax Your Orders To 602 451 9495 Atm M C GOLDMIN ae RES Minimum Order 10 00 plus 4 00 Shipping and Handling We accept MasterCard Visa and Money orders Canadians and Orders that need US MAIL send minimum 5 00 S amp H PO Box 5408 Scottsdale AZ 85261 IF YOU CAN T FIND WHAT YOU ARE LOOKING FOR CALL FOR A FREE COPY OF OUR LATEST CATALOG THIS CATALOG CONTAINS OUR ENTIRE PRODUCT LINE OF OVER 3 000 ITEMS AND IT IS STILL GROWING ULTRASONIC PEOPLE DETECTOR G5809 14 95 These are very interesting ultrasonic people detectors They wese designed to open doors at stores when a human approached They have an adjustable range from 4 ft to 10 ft with a relay contact closure Made by a company called Microwave Sensors but these use ultrasonic sensor technology They are the complete Circuit board assembly from their model 014 and feature 12VAC or 24VAC operation use a transtormer or our G950 adapter shown on pg 71 of our catalog a conical detection paltern response lime of 2 sec hold time continuous as long as you are in its field of view reSel Ilme adjustabie 1 to 15 seconds current draw 60 ma idle 135 ma activated fequency 47KH2 contacts N O or N C 2 amps They operate on AC only not D
151. b 21 Mar 24 Apr 20 May 20 Jun 20 Jul 22 Aug 18 Sep 24 0ct 22 Nov 16 Dec 20 Ni Cd Resistance QA Feb 12 LET May 12 LET Jul 16 Night Vision Scopes Justic amp Phillips C Oct 57 Null Modem QA Oct 8 O Obsoiete Semiconductor Sources Lancaster HH Jun 83 OS 2 or DOS QA Jun 10 Oscilloscope Book Lancaster HH Apr 85 Portable Tektronix Tekmeter ER Oct 16 to Vectorscope Converter Compuvideo ER May 16 Our Automotive Power Supply Comes to Life Grossblatt DB Feb 82 Parallel Processing QA Feb 12 PC VO Breadboard Build This Dage C PC Based RF Signal Generator Doberstein C Mar 35 Apr 61 Phase Locked Loops Marston Aug 47 Oct 69 Nov 63 Piano Trainer MicroConductor The Tarchinski C Sep 49 PIC Microcontroller Programmer Eady Jan 35 Feb 48 Jun 51 Jul 55 Aug 59 Oct 35 May 75 Picture Stick The Edwards C Pinball Machine Resources Lancaster HH PLD Programmer Build Thls Brown C May 39 LET Aug 12 PLL Section of our Tachometer The Grossblatt DB Jul 80 Plotter X Y Brown C May 57 PostScript Review Lancaster HH Aug 77 Power Amplifiers Marston Apr 65 Power Line Modem for Home Control Keefe C Mar 57 Power Supply Regulation Luchi Dec 69 Practical Transistor Circuits Marston May 57 Problem with Software Documentation The Holtzman CC Dec 28 Programmabie Interconnects Lancaster HH May 75 Programmable Logic Devices Brown May 31 Build This PLD Prog
152. be 120 230 Debco Electronics 105 127 Deco Industries 34 Electronics Book Club 30 241 Electronic Goldmine 115 Electronic Tech Today 78 121 Fluke Corporation CV2 182 Foley Belsaw Company 81 130 POLFODIC oe eerta mos 112 Grantham College 16 135 Halcyon Group 101 86 Heath Company 23 324 Highlander Gault 110 Information Unlimited 104 126 Interactive Image Technologies 132 ITC Instruments 99 176 Jensen Tools Inc 34 249 Kelvin Electronics 109 193 Mini Circuits CV4 Mondo tronics Inc 118 257 Needham Electronics 101 NREPSCHOOIMS ccce etes 13 51 Oatley Electronics 113 260 Ocean State Electronics 00 195 Parallax suene eie reis CV3 262 Parts Express Inga aonobioscoa ror ens 106 100 The School of VCR Repair 83 Tab BOOKS ore docete etes 21 92 Tektronix Inc 5 194 Tektronix Inc 29 HSS Time
153. be taught to have eight different functions and each pin can be non buffered for analog signal pass through Digital inputs can be buff ered or latched Outputs can be buffered registered or held either high or low Information on newer devices likely to overcome all of the obvious defects of this current crop of prod ucts should show up in the usua electronics publications such as E E Times EDN Electronic Design Electronic Component News and in Electronic Products Lets have your thoughts on new MultiFAX Route 1 Box 27 Peachland NC 28133 704 272 9028 W W Norton 500 Fifth Avenue 6th FI New York NY 10110 212 354 5500 OrthoLogic Corp 2850 S 36th St 16 Phoenix AZ 85034 602 437 5520 Prometheus Books 700 E Amherst Street Buffalo NY 14215 716 837 2475 Seismo Watch Newsletter PO Box 18012 Reno NV 89511 800 852 2960 Stratagene 11011 N Torrey Pines Rd La Jolla CA 92037 800 424 5444 Tektronix PO Box 500 Beaverton OR 97077 800 426 2200 Thunder s Mouth Press 632 Broadway 7th FI New York NY 10012 212 780 0380 F Watts Books 95 Madison Avenue New York NY 10016 212 951 2650 ZFX 40 Washington Street Westborough MA 01581 800 876 1232 hacker applications for these excit ing parts The usual ncredible Se cret Money Machine ll book rewards for your contributions New tech lit Motorola has a new Master Se lection Guide One unique new IC is the MC144143 TV closed
154. brands of infrared receiver circuits in the host en tertainment products you quickly realize that there is no way to predict which combina tion will cause interference problems Bulky magnetic fluorescent tube ballasts might weigh more than ten ounces so they can make a table lamp top heavy Moreover these lights flicker for afew moments when turned on and some might hum But they don t interfere with your in frared remote control and they also save on your electric bill I made my tests on popular consumer electronics products a Scientific Atlanta 8500321 ca ble converter Mitsubishi CS 2655R and Toshiba CE2058 TV receivers and an RCA VR680HF VCR I tested all three products with their original equipment remote controls as well as the universal URC 2085 from Universal Electronics I went on to test three Tech nics products an SA R277 ster eo receiver a CL PC10 CD player and a SR TRI155 dual cassette tape deck One original equipment remote control oper ates all of those components encountered six instances of infrared interference as shown in the last five columns of Table l As expected only the elec tronically ballasted fluorescent tubes caused interference I be lieve continuous interference is caused only when the ballast frequency is half that of the in frared remote controls modula tion frequency FLUORESCENT TUBES COMPARED with a 60 watt incandescent lamp are LOA s 22 100 watt circ
155. caption decoder Tektronix has a number of videos and application notes that you might be interested in One video is on The VectorScope a crucial instru ment for color TV broadcasting and video production There s also a pair of videos on cable measurement plus others on such specialized top d l i Bea computer repair expert i CAREER LEVEL HOME STUDY Learn PC repairs troubleshooting servicing upgrad ing installation In crease your value l as an employee or open your own M ad business I No expensive n instruments i no high tech _ electronics 9 Over 90 of i 4 PC repairs 39 and service involve easy mechanical pro cedures or parts replacements Send or call for free literature 800 223 4542 Name Agr l Address Phone City State Zip The School of PC Repair 5065 Roswell Road L E Atlanta Georgia 30328 j mW We NENNEN CIRCLE 160 ON FREE INFORMATION CARD WE BUY WE SELL Infrared iul kit azin High Luminance ed LED 1 Projector kit TY it 5mm GLSHD47 Sharp CM i Price 10 00 lat 300mcd x 48 14 400mcd eSuper AKI 80 Kit AKI 80 Gold Silver Kit Opre alouiput 60 W Vc jJ This expansion kit upgrades the PIO of the Ultra compact Z80 microcomputer board AKI 80 64 parts featunng high speed operation at 12 MHz Max 232 mounting capacity enablesuse o Uses the newest Z80 compound CPU y boar rd 232C rterlace Z8ACO15BF T
156. ce CA 90505 Order desk only USA 800 872 8878 CA 800 223 9977 LA amp Technical Info 310 784 5488 Fax 310 784 7590 EM INQUIRIES WELCOME CIRCLE 275 ON FREE INFORMATION CARD 124 TIMELINE INC Over 8 years and 23 000 customers and still growing KOUA J MONITORS NETWORK IRMA BOARD 8 bit 99 Unks 3270 mainframe systems to IBM PC Proteon ProNet 4 Model p1347 Token Ring Board 79 16 bit e 4 Mbps IEEE 802 2 and 802 5 compatible twisted pair interoperable with IBM Token Ring network e 73 WATT SWITCHING 15 00 or 2 25 00 2 4 pin power connectors attached 115 230 Volt Dim 8 5 L x 4 5 W x 2 H Output 45V 2 9 75 A 12V 0 1 5 A 5V 0 0 4 A 12V 0 0 5 A 68 WATT SWITCHING 12 00 or 2 for 20 00 115 230 Volt SCSI Controller your choice 40 Non Enclosed TTL Comes with pinout 12V at 1 4 Amp input Horizontal frequency 15 Khz Ability to do 40 and 80 column 5 inch Black amp White 35 00 7 inch Amber 5539 00 9 inch Amber 29 95 12 Green or B amp W 19 95 Enclosed 9 Green BNC composite 115V 230V 69 00 12 White BNC composite 24V e 79 00 Mfr Electrohome For Very High Quality Medical and Industrial Applications lt m 5 COLOR MONITOR 69 Flat Faceplate 320 x 200 Dot Resolution 2 for 1 09 99 CGA amp Hercules Compat
157. ch scientific ac tivities as providing the windows for America s space shuttle mirrors for giant telescopes and ceramic fil ters for pollution control Joel Engel and Richard Frenkiel were jointly honored for their funda mental contributions to the theory design and distribution of cellular mobile communications systems Their work led to important ad vances in local area networks as well as worldwide communications based on satellites Joseph Gerbers medal was for past and on going invention de velopment and commercialization of efficient cost effective auto mated manufacturing systems He holds 600 patents and his inven tions have had a significant impact on electronics cartography ship building and the apparel aircraft automotive and optical industries Irwin Jacobs was honored for his contributions to the field of digital wireless communications and for his development of code division multiple access CDMA a U S standard for cellular digital commu nications He and his colleagues de veloped a television signal scram bling system as well as innovations that will improve the next generation of cellular telephones and personal computers Mr Jacobs also de veloped a data transmission and ve hicle location system based on satellites for the trucking and ship ping industries Commerce Secretary Brown de clared Their achievements have contributed to U S economic pros perity and job creation whi
158. ches S1 and S2 The prototype unit has two large holes punched in each end to allow the fan to draw in cool air and exhaust hot air Place a screen over those holes to prevent debris from being drawn inside the unit Prepare an opening for the duplex recep tacle on the front panel with a nibbling tool Once all the metal working on the enclosure is complete it can be painted Next label the en closure the labels can be pro tected with a coat of clear spray enamel When the enclosure is com pletely dry the transformer and fan can be mounted Start with the transformer mounting it to the base of the enclosure with rubber washers to reduce vibra tion Mount the fan in the direc tion so that the cooling air flow will be blowing over the trans former Next install the fuse holder the line cord the three neon indicators switches S1 and S2 and the duplex recepta cle SOI The isolation transformer can produce several amperes of cur rent so use 14 to 16 gauge wire for all connections to and from the transformer However smaller gauge wire can be used for connecting the fan and neon indicators Refer to the schematic di MON S21u04129 3 664 Menuer Electronics Now January 1995 agram Fig 1 and begin the wir ing by connecting the hot side of the line cord black wire to one side of the fuse holder Next solder a wire from the other side of the fuse holder to one termi nal of the main power switch S1
159. chure M C Visa 714 744 0981 Fax 714 744 2693 800 730 3232 AES 10 365 Money Back Guarantee PROGRAM EXTENSION PHONES ESN S amp NAMS ENJOY THE SAME ADVANTAGES AS SOME CUSTOMERS THAT SUBSCRIBE TO GTE MOBILNET OR BELL SOUTH MOBILTY FOR CELLULAR SERVICE CELLULAR PROGRAMMING SERVICE IS ALSO AVAILABLE FOR FREE INFO CALL MOTOROLA ABOVE 9122 OUR SOFTWARE PROGRAMS MANY NEW CELLULAR PHONES DIRECTLY FROM THE DATA PORT WITHOUT OPENING THE PHONE NO SOLDERING DON T BE FOOLED BY CHEAP IMITATIONS GUARANTEED amp TESTED SOFTWARE AVAILABLE FOR MOTOROLA GE ERICSSON SONY MITSUBISHI NOKIA PANASONIC DIAMONDTEL TECHNOPHONE OTHER PRODUCTS COMING SOON SOLD FOR EDUCATIONAL PURPOSES ONLY CELLSOFT 609 751 2242 EXT 2 FAX 609 751 5549 JEM MARKETING LLC 100 SPRINGDALE ROAD A3 SUITE 113 CHERRY HILL NJ 08003 CIRCLE 317 ON FREE INFORMATION CARD E Create Your Own Automated Systems Using Xplor PDCs and Simple BASIC Programs Xplor Personal Digital Controllers can propel you into the wide open frontier of computerized control and monitoring with minimal effort and cost No mere novelty these mini sports pack surprising power and are loaded with extras that make the journey from idea to working reality fun and rewarding Professionals will find Xplor PDCs an efficient economical way to add simple yet reliable control capabilities to prototypes or full scale production runs Beginners and hobbyists can
160. cian I have service technicians by the year 2005 With the right training and skills you control over my future and total can cash in on this wide open opportunity Only NRI prepares you so thoroughly for a confidence in my business full or part time job as a computer service technician even a business of your own vesci en FREE Catalog Gives You the Whole Story Call or Write NRI Today Let us hear from you next Send today for NRI s free full color catalog If the coupon is missing write to NRI Schools McGraw Hill Continuing Education Ceriter 4401 Connecticut Avenue NW Washington DC 20008 I recommend NRI to anyone real challenge The Action Learning eg send today for FREE catalog or call 1 800 321 4634 Ext 1050 Kits allow you to build on what you ee ee ee ee ee GEM GEM GEM GEM GEM GEM GEM REM GEM studied in the lessons rey For career Courses approved no better way exists to learn how Schools ww under GI Bill C check here to troubleshoot and service McGraw Hill Continuing Education Center c a for details l computers R Buda Tenley Park IL 4401 Connecticut Avenue NW Washington DC 20008 Hi E xc vf Check one free catalog only O MICROCOMPUTER SERVICING U Basic Electronics O Desktop Publishing amp Design Q TV Video Audio Servicing C Computer Aided Drafting O PC Applications Specialist No doubt the excellent back up of Q Industrial Electronics and R
161. ciation NCTA al most one quarter of all cable viewers in this country do not pay for the service In 1992 the NCTA estimated that signal theft amounted to a loss to the cable industry of 4 75 billion Satellite scrambling history Signal theft grew in popu larity with the growth of the home satellite TV market in the early 1980s Home TVRO sys tems first became available in 1979 and were particularly at tractive to TV starved rural resi dents At that time a home satellite system cost 10 000 In just a few years the cost for M LI oF po t b o satellite dishes dropped to 2 500 and demand for the dishes surged even in urban areas Home TVRO systems be came a growing concern to pro grammers They worried that the availability of consumer sat ellite TV systems would cause cable TV subscriptions to plummet thus reducing their revenues The industry sought a way to prevent unauthorized viewers from watching their sig nals the result was that pro rammers scrambled their sat ellite delivered signals Signal scrambling upset con sumers and dealt a major blow to the satellite TV industry Sales of satellite systems which had reached 70 000 a month fell to fewer than 15 000 a month The early signal scram bling however Spawned a new industry illegal descrambling The scrambling method chosen by HBO that became the de facto standard for satellite delivered television was Vid eoCipher II
162. cilloscope ER Oct 16 TELEPHONE Call Restrictor Weeder C Oct 51 Distinctive d Decoder Keefe C Mar 43 Line Grabber lannini C Sep 43 Take Back Control of Your Telephone Weeder C Feb 33 Jul 67 TELEVISION SEE ALSO VIDEO NEWS Amateur TV Station Sheets amp Graf C Jul 31 Aug 39 New Age of Satellite TV The Fenton Apr 33 TextGrabber The McArthur C Nov 31 TV Commerciai Editor Hurst C Aug 31 Tesla Coli Solid State Turner C Nov 61 TEST EQUIPMENT Audio Wizard Test Generator Wannamaker C Apr 41 Adjustable Continuity Tester Kennedy C Aug 8 Analog Signal Troubleshooting Campbell May 69 B K Precision LCR Bridge ER Sep 22 Build The Digilyzer Yacono amp Spiwak C Jun 75 Compuvideo Oscilloscope to Vectorscope Converter ER May 16 Fun With Function Generators Kral Oct 42 Hewlett Packard HP 970 Series Multimeters ER Dec 18 ITT Pomona Logic Scope Probe ER Feb 20 K IM NOT CURSING NOM MIS A NEW COMPUTER LANGUAGE Xp ROO SN L Com DXB65 Ethernet Cable Tester ER New Life for Old Scopes Covington PC Based RF Signal Generator Doberstein C Jun 19 Sep 57 Mar 35 Apr 61 Sweep Function Generator Carison C Dec 53 Tektronix Tekmeter Portabie Oscllloscope ER Oct 16 Wavetek BDM40 Benchtop Digital Multimeter ER Jul 20 Test Generator Audio Wizard Wannamaker C Apr 41 TextGrabber The McArthur C Nov 31 Toner Decoder Marston Dec 62 Toner Refill QA M
163. cted Even when I held the desk lamp six inches from the cable box the remote worked First I assumed that the desk lamps tube produced a more natural daylight spec trum and perhaps that was why it differed from the fluores cent bulbs HOW DOES YOUR REMOTE CONTROL WORK Modern remote controls apply many different techniques to communicate with TVs VCRs and other consumer electronic products Their coded signals might vary but all remote control circuits are basically the same Most transmit pulses of infrared energy at a specific frequency e g 56 kilohertz Each time a key is pressed a group of coded pulses is generated PLL A typical code contains 24 bits of bin ary information The first four bits deter mine which one of 16 possible products is to be controlled For example 0 is for the TV receiver 1 is for the first VCR 2 is forthe second VCH and 3 for a compact disk player The next eight bits in the sequence identify the key that has been pressed Those eight bits permit a total of 256 possible key codes The last 12 bits are check bits which are compared with the first 12 bits to detect errors When the receiver within the host product detects an infrared signal it compares it with a clock pulse operating at the same frequency If the signal is high a binary one is generated other wise a zero is generated After the mes sage is decoded the host equipment is commanded to respond Q VISIBLE LIGH
164. ctor WENDY ALANKO circulation analyst THERESA LoMBARDO circulation assistant MICHELE ToRRILLO reprint bookstore Typography by Mates Graphics Cover design by David Loewy Photography by Earl Ripling Electronics Now is indexed in Applied Science amp Technology Index and Readers Guide to Periodical Literature Academic Abstracts and Magazine Article Sum maries Microfilm amp Microfiche editions are avail able Contact circulation department for de tails Advertising Sales Offices listed on page 94 Electronics Now Executive and Administrative Offices 1 516 293 3000 Subscriber Customer Service 1 800 288 0652 Order Entry for New Subscribers 1 800 999 7139 Audit Bureau of Circulations Member MON S21u0JI29 3 664 Kuenuerm Electronics Now January 1995 A review of the latest happenings in electronics AMD to offer Pentium Processors Advanced Micro Devices Inc AMD intends to go head to head with Intel Corporation again over a new generation of micro processors It recently announced that it expects to begin volume pro duction of Pentium like MPU chips by the middle of the year AMD which already makes functional equivalents of Intel s 486 MPU said its new K5 device was twice as fast as Intel s Pentium and would be compatible with Windows software from Microsoft Corporation 1994 National Medal of Technology winners Four persons and two companies received the 1994 Na
165. cture installation of propellants motors Igniters etc Includes list of commonly avallable materials and the design of launch pads and tes beds and thelr electronics 29 08 FIREWORKS How firecrackers M BOs blockbust alarms etc to survive today s dangerous world We all ers Cherry bonibs smali rockets volcanos fountains Hace Increasingly financlally and physically brutal times spark ers and safety fuses are made and colored Fleid expedient use of lechnology in various threat and Simpie cheap common Ingredients 9 Both 36 conflict environments and Scenarios 49 ald Yar educetione B z CIRCLE 226 ON FREE INFORMATION CARD e e D E R S ar EE S S PP PP P EPPEPEEEPEIBERE SS SER EE Dehco Electronics 4025 Edwards Road Cincinnati OH 45209 Toll Free Order Hot Line 1 800 423 4499 Information 513 531 4499 Millions of Chips Transistors and Components in Stock 74LSxx TALS194 9 74HC10 30 008 739143830 Bolla 2 BO FALSOO eene 30 T4L 195 69 74HC11 34 009 139 4531 99 LM34B 8 65 T LSO1 45 24L9196 59 74HC14 35 4010 AIEO enr 89 LMASOK 449 74 S02 3p MLSI97 59 T4HC20 30 401 30 4536 2 19 LM350T 2 99 74LS03 yee ba a0 FALS221 9 74HC21 new 55 4012 ees 30
166. d 1 P amp H 800 221 1705 STOPPING POWER METERS reported on Ube 60 MI How Certain da vices can slow down even stop watihour meters whlie loads draw full powert Device simply plugs into TOPS nB P m Rr one outlet and normal loads Into other outlets Also de f Nas 4 J E scribes meter creep overload droop elc Plans 23 L Q MANUAL External magnetic ways applied to the meter itself to slow down and Stop watthour meters while yt full loads METERS How watthour meters work Calibration error modes many ANS Standards etc Demand and Polyphase stop CONSUMERTRONICS 2011 Crescent Dr P O Drawer 537 Alamogordo NM 88310 Volce goa 434 0234 434 1778 1439 1776 orders only BAM 6PM MST Mon Sat Fax 505 434 0234 orders only H you get Ivoice enter 11 11 any time 24 hour 7 days wk Fraa Tech Support relates directly to your order or prospective order Tues and Thurs only Add 5 total SH US Canada All Items in stock VISA MCard OK No CODs or bill ma s New Calalog 150 ol fers 2 w order 4 w check or MO no free cataing Since 1971 As seen on TV etc John Willlams former Lock heed Senior Engineer NMSU Computer Sclenca Prolessor NIH Health PhysicisL WANTED 9 MAC lici PC386 or better All software supports all IBM PC com patibie x86 systems 8086 Pentium Off The Shelf HARDWARE an Eck sysiem Cala Lard Reaoee Writer ATM2 Radar Emi
167. d L Roane Route 601 Cologne VA 23037 e Source code listing and pro grammed MC68705P3 24 95 postpaid VA residents must add appropri ate sales tax B LN NUN E M e POWER CONTROLLER FOIL PATTERN Software design The complete listing of the software is available from the author as detailed in the Parts List It is also available on the E UCNCNCNCNCN UN J2 120VAC occ OUTPUTS INPUT T init ye Jui FIG 2 MOUNT ALL COMPONENTS AS SHOWN HERE Note that four jumpers mount on the component side of the board WX x SEX e dou s ub 1 4 INCHES 4 Gernsback BBS 516 293 2283 v 32 v 42bis look for file POWCON ASM An overview of the major routines follows The interrupt routine sets up TABLE 1 POWER LEVELS Power Level Voltage VAC Percent On 96 0 1 2 1 0 1 1 9 1 6 2 2 6 2 2 3 6 6 5i 4 9 2 y 5 12 2 10 2 6 15 6 13 0 Z 19 5 16 3 8 23 6 19 7 9 27 9 23 3 10 32 8 27 3 11 rw d 31 4 12 42 9 35 8 13 48 2 40 2 14 53 6 44 7 15 59 0 49 2 16 64 4 53 7 TY 70 8 59 0 18 75 2 62 7 19 80 2 66 8 20 85 2 71 0 21 90 0 75 0 22 94 5 78 8 23 97 8 81 5 24 101 6 84 7 25 105 3 87 8 26 107 3 89 4 27 110 2 91 8 28 112 7 93 9 29 114 8 95 7 30 116 4 97 31 0 0 0 0 TABLE 2 APPLICATION AND JUMPER SELECTION Value Application JU1 JU2 JU3 JU4 0 Manual GND 5 5 GND 1 External 5 GND 2 Sequencer GND 3 Run and Flash
168. d lasts 750 hours By con trast a 22 watt compact fluo rescent tube will last 10 000 hours while giving an equiv alent amount of light For star ters you can buy a compact flu orescent tube for less then 12 the cost of 13 replacement incandescent bulbs If your average lighting usage is three hours a day and you pay a typical rate of 8 5 cents per kilowatt hour you will save 7 26 per year on each light tube At the very high New York City utility rate of 20 cents per kilowatt hour you ll save 17 08 At that rate each fluo rescent light will save you 154 over its nine year life Testing the lamps To see how pervasive inter ference is I tested a number of consumer electronics products in the presence of 12 fluorescent lights made by eight different manufacturers With the excep tion of a swing arm desk lamp magnifier all the compact fluo rescent lamps had threaded bases that screw into standard incandescent lamp sockets Electronic ballasts are light in TABLE LAMPS WITH ABCO FLUORESCENT tubes are lighter and more stable be cause the heavy magnetic ballast is located at the wall outlet It is as bright as the 60 watt incandescent bulb weight and start the associated fluorescent lamp instantly but as has been pointed out they can interfere with infrared re mote controls However if you consider the many different flu orescent lamp operating fre quencies and the differences between the
169. d quickly ina matter of seconds in any object or room Today you may have used a telephone handset that was bugged It probably contained three bugs One was a phony bug to fool you into belteving you found a bug and secured the telephone The sec ond bug placates the investigator when he finds the real thing And the third bug is found only by the professional who continued to search just in case there were more bugs The professional is not witbout his tools Special equipment has been de signed so that the professional can sweep a room so that he can detect voice acti vated VOX and remote activated bugs Some of this equipment can be operated by novices others require a trained coun tersurveillance professional The professionals viewed on your tele vision screen reveal information on the latest cechnological advances like laser beam snoopers that are installed hun dreds of feet away from the room they snoop on The professionals disclose that computers yield information too easily This advertisement was not written by a countersurveillance professional but by a beginner whose only experience came from viewing the video tape in the pri vacy of his home After you review the video carefully and understand its con tents you have taken the first important step in either acquiring professional help with your surveillance problems or you may very well consider a career as a coun tersurveillance professional The Dol
170. d to the room your stereo is in With the wireless headphones you can listen to your TV stereo or CD player while you move freely between rooms exercise or do other activities And unlike infrared headphones you don t have to be in a line of sight with the transmit ter giving you a full 150 foot range The headphones and speakers have their own built in receiver so no wires are needed between you and your stereo One transmitter operates an unlimited number of speakers and headphones Recoton s transmitter sends music through walls to wireless speakers over a 75 000 square foot area Crisp sound throughout your home Just imagine being able to listen to your stereo TV VCR or CD player in any room of your home with out having to run miles of speaker wire Plus you ll never have to worry about range because the new 900 MHz technology allows stereo signals to travel over distances of 150 feet or more through walls ceilings and floors with out losing sound quality One transmitter un limited receivers The powerful transmitter plugs into a headphone audio out or tape out jack on your stereo or TV com ponent transmitting mu sic wirelessly to your speakers or headphones The speakers plug into an outlet The one transmit ter can broadcast to an un limited number of stereo speakers and headphones And since each speaker contains its own built in receiver amplifier there are no wires running from the stereo t
171. dd a 1 3GHz Tracking Generator to any unit 001 ppm ISO9002 CERTIFIED REG PRICE 599 00 SAVE 120 00 Call 800 566 1818 To Order or Info Free 1995 Catalog Sensitivity is 5mV 1Hz to 13 GHz Carries a full line of Scopes Analyzers Frequency Counters Generators LCR Bridges amp DMM S Call Today amp MON S21UOJI29 3 GEE Menuer 702 885 0234 FAX 702 885 7600 Call Toll Free 800 566 1818 BBS 310 549 0321 PRICES amp SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE OR OBLIGATION F O B CARSON CITY NV NV RESIDENTS ADD SALES TAX CIRCLE 132 ON FREE INFORMATION CARD Electronics Now January 1995 100 OCEAN STATE ELECTRONICS HOBBYIST AMATEUR OR COMMERCIAL WE RE YOUR ONE STOP ELECTRONIC SOU RCE CALL OR WRITE FOR OUR FREE 120 PAGE CATALOG 1 401 596 3080 DELUX CODE KEY Adjustable heavy duty brass base with ball bearing prvots Designed for hard usage 3 16 plated contacts 12 75 CODE PRACTICE OSCILLATOR amp MONITOR IN KIT FORM OR WIRED A solid state code practice oscillator and montor that uses the latest IC circurtry It contains a 3 buift in speaker headphone terminals a volume Contro and a tone Control It is a attractively packaged with a two color panel With the addition of a few parts the unit can easily be converted Into CW montor It can there fore be used as an operating aid after the code has been learned Ki mms 9 19 95
172. developed a stan dard for interconnecting com puters and peripherals in net works with infrared signals It would for example permit a printer to be located anywhere in the room It would also per mit a personal digital assistant PDA to download data to a per sonal computer without a cable connection The Consumer Electronics Bus CEBus is a multimedia standard for home control It covers signaling over power lines radio frequency and in frared transmission and coax ial and twisted pair cabling The infrared emission frequen cy is about 100 kilohertz in the near infrared region Mr Mock said that so far no problems have been encountered with the energy saving fluorescent tubes but we still have to make sure the tubes don t emit in that frequency range What s the payback If you consider all of the inter fering signals that these energy saving fluorescent lights trans mit why should you consider buying them The answer is to save money on electric bills All fluorescent lighting saves money over equivalent incan descent lighting because it pro duces light more efficiently A fluorescent tube costs 60 to 75 less to operate than an equivalent incandescent bulb andit hasalife that is about ten times longer Also with higher efficiency lighting less heat is dissipated in the room es pecially important in air con ditioned rooms A typical 100 watt incandes cent bulb costs about 90 cents an
173. digital circuitry also re quires an oscilloscope to determine if digital data is present where it should be and if it is correct Although oscilloscope prices have declined dramatically over the last decade cost still restricts many oscilloscope purchases A new basic oscilloscope will cost about 300 although at that price it will lack many desirable features The most inexpensive full featured os cilloscope will cost upwards of 500 and high performance instru ments with digital storage are priced over 1000 Every electronics enthusiast should really have an oscilloscope on his test bench but the price of a versatile high perfomance instru ment is often too high for the aver age hobbyist even many profes HEU dnb pe settee T uS s e f n LE Scc tts pe LPC Sif e a ens HIER Li er E ded b P ane d sional service centers need ultra low cost instrumentation for some of their repair stations An alternative Its a safe bet that more Electronics Now readers own per sonal computers than personal os cilloscopes A PC contains a CRT in its monitor and its sophisticated cir cuitry can be programmed to do countless tasks under software control What happens if a test sig nal is presented to an input port on a PC With the right software the computer can display the signal just like an oscilloscope That s just what the Allison Tech nology O Scope I does it s a low cost single channel digita
174. distributor Mouser Electronics sells one for 63 50 it will supply only 2 17 amperes or about 250 watts Even this modest price is al most three times what our com plete project will cost DOYLE WHISENANT Operation Figure 1 is the schematic for the isolation transformer Fuse protected AC line power is first applied to power switch Sl When S1 is closed neon power indicator NE lights up and power is applied to a cooling fan and to standby switch S2 This arrangement allows trans former power to be turned off while permitting the fan to con tinue cooling the transformer Neon standby indicator NE2 is wired across switch S2 so that it lights when S2 is open When S2 is closed power is ap plied to the primary side of 1 1 isolation transformer T1 The secondary side of T1 supplies isolated AC power to receptacle SOI Neon indicator NE3 lights when power is applied to the re ceptacle SOI The isolation transformer will supply 1000 watts for short pe riods of time and 500 watts or less continuously However it will run too hot if 500 watts is exceeded for more than about half an hour The transformer for this proj ect was made from the windings of two microwave oven transfor mers Microwave ovens have heavy duty transformers see Fig 2 that consist of three windings a 120 volt AC input coil a 2000 to 3000 volt AC output coil and a 3 to 5 volt AC coil that serves as the filament winding for the
175. e determine that the party is hooked up illegally and issue a desk appearance ticket In New York State theft of services is punishable by up to a 1000 fine or a year in jail In most instances if the homeowner has no criminal record he will be able to plea bargain to a lesser offense Most legal ac tions involve a civil suit Damage awards start at about 1 500 in a civil suit When I think of a pirate I think of a seller or a distributor of illegal electronic products not a homeowner says Hack This is a business entity that advertises openly and is aware of the law According to Hack most illegal distributors do not sell in the states in which they are located to avoid prosecution under state law A typical brochure from a mail order operation will dis play seemingly top of the line equipment with brand names such as General Instrument Panasonic Toshiba and Scien tific Atlanta Usually the chan nel converter which can be legally acquired will be offered for sale along with the add on or stand alone descrambler also called a starbase a black box a pancake or a hotplate in the pirate trade In some instances the equip ment offered for sale is acquired from a cable operator who is about to upgrade the equip ment in his franchise In such cases a distributor who buys the inventory that is to be up graded diverts the equipment to a pirate operation Piracy goes well beyond elec tronic hobb
176. e Call your home or office phone push a secret tone on your telephone keypad to access either A On premises sounds and voices or B Existing telephone conversation with break in capability for emergency messages CAUTION Before assembly or use check legalities with your state Attorney General s office as you may require beepers or other 3rd party alerts TELEGRAB1 Plans Only 10 00 99 50 Visible Beam Laser Easy to build RED Beam visible for miles Use for E shows window bounce holography cloud illumination and much moe LASIKM Kit wimw Laser Tube Class Il 69 50 LAS3KM Kit w 2 5mw Laser Tube Class IIA 99 50 100 000V Intimidator Shock Wand Module Build an electrical device that is affective up to 20 feet May be enclosed for handheld portable field or laboratory applications ITM2KM Easy to Assemble Electronics Kit 49 50 ITM2 Plans only credit able to kit 10 00 E lon Ray Gun Projects charged ions that induce shocks in people and objects without any connection Great science project as well as a high Shirt pocket size electronic device produces time variant complex shock waves of intense directional acoustic energy capable of warding off aggressive animals etc IPG Plans 98 00 IPG7K KitPians 49 50 IPG70 Assembled m 74 50 1000 Ft tato Cannon NOT A TOY Uses electronic or
177. e Code 3 95 O BP157 How to Write ZX amp Spectrum Games Programs 3 95 O BP158 An Introduction to Programming the Commodore 16 amp PLUS4 4 95 SHIPPING CHARGES IN USA AND CANADA 0 01 to 5 00 5 01 to 10 00 10 01 to 20 00 20 01 to 30 00 30 01 to 40 00 40 01 to 50 00 50 01 and above outside of USA amp Amstrad PCW 8256 amp PCW 8512 9 95 SORRY No orders accepted ARENA EAA O BP108 International Diode Equiv Bhioda alents Guide 5 95 Discover direct or Lose possible substitutes for a popular user oriented selection of diodes including rectifier and signal types including Zener diodes LEDs diacs triacs thyristors OCIs photo diodes display diodes and others Wherever possible material type function or type of diode and country of origin data are shown and foreign equiv alents O BP161 Tinto the QL Archive database program 2 95 Number of books ordered iE Canada Total price of merchandise Shipping see chart Sales Tax NYS only Total Enclosed All payments must be in U S funds MI 8 ont Heathkit is Better We Teach You Take Care Of You And We Put Our Money VW nere Our Mouth Is Using real world exercises and easy tc anderstand lessons vou will learn all the theery the skills and the trade secrets to confront and con qier the p actical and techrical aspects of the PC revolution And unkke othe
178. e activated projects with this transmitter and an IR receiver module These were originally designed lo activate a burglar alarm system which we don t have by remote control The transmitter features a red activation button a dip switch inside to change output code operation from 9V battery nol included red LED transmit indicator to show when IR energy Is being transmitted and a compact 4 1 4 x 1 3 16 x 3 4 black stylish case Brand new in blister pack with 2 peel and stick premise protected Stickers We also supply an inlo sheet that shows how to Convert this transmitter unit into a programmable IR receiver so a pair of these transmitter units could cover both transmit and receive functions SONAR LIGHT Sound activated bright light tor dark areas in your house These react to tapping knocking cries of distress clapping of hands Snapping of fingers breaking glass or if the sensitivity control is turned up just walking 5 on a floor will turn it on Light remains on for 2 to 5 minutes seleclable alter sound occurs It is very sophisticated and has an IC circuit Will not go on except in darkness Plugs into a standard 120VAC wall outlet and features a bright light in a compact Contemparary case Needs no batteries Ccomplete and ready to Q0 no more stumbling around in the dark In retail blister pack G6134 7 95 TLO84 QUAD OP AMP SMD nm Prime popular TLO84 JFET input tiny SMD case quad op amp G625
179. e say return them for a complete No Questions Asked refund The ELF 1 rear channel speakers Integrate perfectly with the HTS 1 The Dialog powered center channel speaker is video shielded HTS 1 Home Theater Decoder 99 10 S amp H Speakers designed by Chase for the HTS 1 ELF 1 Rear Channel Speakers pr 99 10 S amp H DIALOG Center Channel Speaker 75 8 S amp H ur magic of home theater at a traction of the cost of all other systems Audiophile Audition a nationally syndi cated radio program for audio enthusiasts savs T i Please mention promotional code 117 ET1105 For fastest service call toll free 24 hours a day ES Ic To order by mail send check or money order for the total amount including S amp H VA residents add 4 5 sales tax Or charge it to your credit card enclosing your account number and expiration date AWARD WINNING DESIGN t the 1994 Summer Consumer Electronics show in Chicago the HTS 1 won the Design and Engineering Award for being one of the best and most innovative new products of 1994 This award winning design from Chase Technologies is a breakthrough for it s ease of use affordability and outstanding performance ERE INDUSTRIES 2820 Waterford Lake Drive Suite 106 Midlothian Virginia 23113 The new award winning HTS 1 Decoder A M M S M M MON S21u0J129 3
180. eakers for the optimum surround sound effect with encoded programming In addition to discussing the manufactured prod ucts Wolenik includes guidance on the selection of the optimum room in your house or apartment for the installation of a home theater system He tells you how to in stall acoustic insulation in that room to minimize or eliminate unwanted noise to improve viewing and lis tening pleasure A 16 page full color in sert in the book illustrates actual home theater in stallations and pricing in formation is included for many of the components shown Q COMPUTER CONNECTIONS i ast month started a discus L of computer industry unmentionables beginning with the D word documentation Second on my list is the userinter face design What is userinterface design oome think of it as sizing shap ing and coloring screen widgets to achieve a visually pleasing result That viewpoint is so outrageously incorrect as to be unworthy of com ment It comes from a prejudice based on an underlying how view of the world versus a philosophic theosophic or even aesthetic why point of view Look at your computer Cor at Fig 1 It s got a serial interface a paral lel interface a video interface a hard disk interface a network inter face and a user interface From one point of view POV the user inter face is just another thing that links the computer to some peripheral device be it a p
181. eans up with soap and water 1 pint can EN 340 510 Clear EN 340 512 Black CET Study Guide 322 pages with 179 illustrations Written by Sam Wilson the director of CET testing for ISCET Contains sample tests with answers for both the associate level and journeyman level certified electronics technician CET Copyright 1987 3 edition Net weight 1 Ib EN 500 100 Game Bit Drivers ameboy battery packs 6 1 2 Two Way System The basis of all architectural audio systems This is our most popular in wall The perfect system for main and or surround speakers asily installed in any 2 x 4 or larger wall Retrofit design allows installation in new or existing walls in minutes All of our in walls feature high quality crossovers and premium drivers that can outperform the name brands Specifications 6 1 2 poly woofer with a 10 oz magnet 1 field re placeable soft dome tweeter Integral 2 way crossover with pushbutton wire terminal 8 ohm impedance Frequency response 40 20 000 Hz 40 watts RMS 80 watts max power handling capability Sensitivity 90 dB 1W 1m Dimensions 8 1 2 W x 12 L x 3 1 2 D Net weight 9 Ibs per pair EN 300 036 249 suc usn ve 1 24 s PRS 1 2 PRS UP Electronic Video Library Save over 30 00 by purchasing this complete gt library of six Video School instructional videos You ll receive VCR 1 How To Clean VCRs VCR 2 Mino
182. een looking t N wu ba Contact your local authorized Tektronix distributor CHECK OUT THE ENTIRE TEKTOOLS LINE FOR ALL YOUR MEASUREMENT NEEDS today or call 800 426 2200 ext 299 CIRCLE 92 ON FREE INFORMATION CARD mm Suggested retail price model THM 550 Copyright 1994 Tektronix inc All rights reserved TekMeter TekTools and Tektronix are trademarks of Tektranix Inc DPW 234597 1 Jj ektronix Electronics Now January 1995 e Network indexer ABC will make it easier to index your video tapes according to current plans The network has agreed to broad cast Index Plus information during the vertical blanking interval VBD of its broadcasts The data that its affil iated stations will send out will trig ger specially equipped VCRs to record its programs and make a rec ord of the programs recorded which can be displayed on screen For subsequent viewing the VCR owner can select any program from an on screen directory and push a remote control button Presto the VCR advances to the proper point and begins playback The system also makes it possible to display a list of programs with a guide show ing the volume number of the cas sette on which each is recorded The information transmitted by ABC will be on the extended data service EDS portion of the VBI which actually is filed number 2 of the closed caption line number 21 The system also will provide contin uous program information the name of t
183. emiconductor three from Philips and nine from SGS Thomson Because op amps from all of these suppliers have essentially the same characteristics the A741 will be referred to by the generic designation 741 for the remainder of this article Far from being a leading edge device the 741 is nevertheless well suited for experiments and prototyping because of its low price and ready availability A commodity 741 can be purchased from electronic dis tributors for less than 50 cents and that unit price falls signi cantly in large purchases of hundreds Some of the typical electrical characteristics of the 741 are given in the first column of Table 1 Many op amps now in production have characteristics that surpass those of the 741 but they generally cost more The performance of the two other op amps included in the table will be discussed later in this article Figure 1 is the schematic for the 741 illustrating its complex ity This contains 19 tran sistors but in other versions diodes have replaced two tran sistors Figure 2 is the pinout diagram for the commodity 741 in an eight pin plastic DIP case Figure 3 is the standard sche matic symbol for all op amps but power supply connections are not always shown Many op amps are powered from split power supplies as shown in Fig 3 The V V and ground zero volt rails per mit the op amp s output to swing on either side of zero volts and be set at zero
184. en sities up to 11 x 11 are offered Any lead can be taught to be an input or a three state digital output that can be its input the complement of its input a one or a zero The de vices are reprogrammable But an A side input output can only be routed to B side pins These de vices are ideal as DIP packaged Switch replacements Meanwhile Cube is offering FPID devices short for Field Pro grammable Interconnect Devices While essentially PLD style de vices those also provide for high impedance analog applications Crossbar architecture is available with densities as high as 320 x 320 Since this is static RAM NAMES AND NUMBERS Access to Energy Box 1250 Cave Junction OR 97523 503 592 4142 Accu Weather 619 W College Avenue State College PA 16801 814 234 9601 Basic Books 10 East 53rd Street New York NY 10022 212 207 7057 Bergquist 5300 Edina Industrial Blvd Edina MN 55439 612 835 2322 Design Toscano 17 East Campbell Street Arlington Heights IL 60005 800 525 0733 EITD 2057 2 Aurora Road Twinsburg OH 44087 216 425 9000 Extraordinary Science PO Box 5636 Colorado Springs CO 80931 719 475 0918 Lindsay Publications PO Box 538 Bradley IL 60915 815 935 5353 Magnetic Research 122 Bellevue Avenue Butler NJ 07405 201 838 6348 Motorola 5005 E McDowell Rd Phoenix AZ 85008 800 521 6274 based it must be retaught every time power is turned off Each pin can
185. en each input pin and the output pin The circuit s output is equal to the sum of the four input signal voltages This simple circuit can be come a practical audio mixer by feeding each input signal to its input network channel with a 10 kilohm volume control po tentiometer If desired the cir cuit can provide voltage gain greater than unity by increasing the value of feedback resistor R6 The number of input chan nels can also be increased by adding additional RC networks for each new channel desired 0 Plug a Friend into Electronics and Save Ly 03 This Christmas give an electrifying gift plug a friend into Electronics Now and brighten the whole new year Whether electronics is your friend s livelihood or hobby your gift will illuminate the whole spectrum of electronics throughout the coming year and provide a monthly reminder of your friendship Electronics Now will keep your friend informed and up to date with new ideas and innovations in al areas of electronics technology computers video radio stereo solid stat devices satellite TV industrial and medical electronics communications robotics and much much more We ll provide great plans and printed circuit patterns for grea electronic projects In just the last year Electronics Now has presented amate ir TV equipment computer peripherals microcontroller programmers test equipment audio amplifiers telephone projects relay circ
186. equired Built in C MOS LCD driver amp controller Easy Microprocessor interface 98 ASCII character generator Certain models are backlit call for more info Graphic and alphanumeric serial interface Size Mfr Price L ea HERB T PERELE ri TRU ng 50 00 640 x 400 backlit Pand ON Cga sse rm dp tmntiti 35 00 640 Ce aed primm n Tek D ome mme e 19 00 AEON 128 eroe Hitachi 15 00 756 X 128 1 2 ae ae BOE ON na doce cape 1 Lana 25 00 240 x 128 backlit i milio not 20 00 Dx T28 us Dosniccereeccl mess OBEX AM Lonen S15 90 LASER PRODUCTS HeNe Laser Head 10Mw max output TEMOO 15 5 long MFG NEC 9 9 22 Laser Power Supply forHeNetube 100 LASER SCANNER ASSEMBLY 29 Assembly intended for a laser printer Includes laser diode polygon motor 6 sided and misc optics and lenses LASER DIODE 5mW with collimator 20 2 LASER DIODE Sharp part ee SMW at 780 nm sngle transverse mode MAGNETIC CARD READER 2 Includes e 20 character dot matrix display with full alpha numeric capability e keypanel with full alpha numeric entry e separate 7 5 VDC 0 5 Amp ge supply e standard telephone interface extension cord e lithium battery and flat cone speaker HP bar code wand HBCS 2300 635 00 POWER SUPPLYS Electronics Now January 1995 IBM 370 option XT and AT emulation boards 50 00 23605 TELO Ave Torran
187. er Build the Yacono amp Spiwak C Jun 75 Digital ogey Contest Lancaster HH Jan 80 Clock Kit Jameco Electronics JE725 ER Nov 14 Compression The Sound of Klein AUD Dec 86 Multimeter Benchtop Wavetek BDM40 ER Jul 20 Directional Hearing Kiein AUD Nov 80 Disk Diiemma QA Jan 10 LET Oct 10 Disk Drive Solid State Hattan C Apr 49 Distinctive Ring Decoder Build This Keele C Mar 43 Dowsing Resources Lancaster HH More on Lancaster HH Nov 71 DRAWING BOARD Grossblatt D Jan 28 Feb 82 Apr 24 May 86 Jun 29 Jul 80 Sep 84 Oct 86 Nov 86 Adding Old Fashioned Gauges to Aug 77 LET Oct 10 Modern Automobiles Jan 28 Aiternate Tachometer Design Takes Shape Our Oct 86 Closer Look at our Automotive Power Supply A May 86 Completing the Tachometers Spark Counter Section Nov 86 Different Tachometer Design ag Sean A Sep 84 Our Automotive Power Supply Comes to Life Feb 82 PLL Section of our Tachometer The Jui 80 Two Possible Designs for our Tachometer s Counting Circuit Jun 29 Why Build Tachometer Apr 24 Dynamics of Music and the Evolution of Audio Instrumentation Klein AUD Mar 16 EDITORIAL D Mar 6 Keeping Up Your Technical Skilis Steckler Mar 6 Electric Vehicle Information Lancaster HH Mar 81 Electronic Face The Sonntag C Jul 41 Elenco Electronics SM 220K Decision Maker ER Apr 16 Elusive Readings QA Apr 10 EMI and RFI Differences QA Oct 8 Environmental Semiconductor Testing By
188. ers Nov 55 EQUIPMENT REPORTS D Jan 18 Feb 20 Mar 22 Apr 16 May 16 Jun 19 Jul 20 Aug 11 Sep 22 0ct 16 Nov 14 Dec 18 B K Precision LCR Bridge Sep 22 Compuvideo Oscilloscope to Vectorscope Converter May 16 Cybermations SCK 2000 Stepper Motor Controller Aug 11 Dailas Semiconductor DS1620 Demonstration Kit Mar 22 DIC SC 7000 Desoldering Tool Jan 18 Elenco Electronics SM 220K Decision Maker Apr 16 Hewlett Packard HP 970 Series Multimeters Dec 18 ITT Pomona Logic Scope Probe Feb 20 Jameco Electronics JE725 Digital Clock Kit Nov 14 L Com DXB65 Ethernet Cable Tester Jun 19 Tektronix Tekmeter Portable Oscilloscope Oct 16 Wavetek BDM40 Benchtop Digital Multimeter Jul 20 Ethernet Cabie Tester L Com DXB65 ER Jun 19 Evolution of Audio Instrumentation and the Dynamics of Music Klein AUD Mar 16 Falling Prices are not Necessarily a Good Thing Holtzman CC Jan 88 Fan Shut Off QA Feb 12 Flashlight Automatic Rechargeable Spiwak C Oct 65 FM DX Reception Lancaster HH Jun 83 Follow that Noise QA Jun 10 Frequency Doubler Yacono C Nov 44 Fun With Function Generators Kral Oct 42 G General Magic Has Somethin Up Its Sieeve Holtzman Ce May 90 H Hacker Opportunities Lancaster HH Jul 71 Hacker s Data Exchange Lancaster HH Feb 73 HARDWARE HACKER Lancaster D Jan 80 Feb 73 Mar 81 Apr 85 May 75 Jun 83 Jul 71 Aug 77 Sep 75 Oct 75 Nov 71 Dec 77 The Fundamentais of SCSI Communications Apr 85 Basic
189. es The Unix shell has an almost astounding collection of tools which is great What is bad is the total lack of consistency among them Even among people who aren t afraid of command line inter faces Unix commands provide a se vere test Its not hard to stump even experienced Unix users on some arcane feature or another The MS DOS shell can be viewed as a very limited subset of the Unix shell but it is nonetheless full of inconsistencies For example mod ern versions of the DIR command allow you to select and sort directo ry listings in various ways In a bet ter system the same select and sort options would apply to com poa es mands across the board For exam ple the command DIR 4D S B lists all directories beneath the current di rectory If the copy command had the same options could duplicate the disk structure without copying all the associated files by typing COPY FROMDISK TODISK AD S B In the graphical user interface GUN world it is instructive to com pare OS 2 to Windows 3 1 and to the upcoming version of Windows code named Chicago but now of ficially known as Windows 95 There is nothing to be said that hasn t al ready been said about the problems with the Program Manager File Manager dichotomy in Win31 On the other hand not enough has been said about the elegant consistent design exhibited by OS 2 2 x and later versions The reason is probably the large dif ference in usage be
190. es in this case the eight bit word supplied by the VARPTR and the eight bit equivalent of 2 Since 2 take son binary values only 0 1 2 4 8 16 32 64 and 128 only one bit of binary word equiv alent to 2 is a high for each value of X When two bits are ANDed the result is a one when both bits are ones If the N amp byte being scanned has a one as its MSB and it is ANbed with 27 the result of the anp function will be a binary word equivalent to decimal 128 If the MSB is zero the resulting word will be zero This process is called masking and it should be fa miliar to anyone experienced with C or machine language programming As the value of X changes from 7 to O each bit of the current byte is tested by the AND function The final part of the program line THEN sets variable dt to either a 2 or a O Refer to Table 1 Data to be fed to the NCO ap pears as the second bit of the parallel port data word and it has a binary weight of 2 The two OUT instructions send bytes to the parallel port data register dp The first OUT instruction sends the results of the bit analysis O or 2 plus 4 to the NCO The 4 refer to Table 1 controls the NCO s FLOAD input that should be set high when data is being transferred to the chip The second OUT in struction is identical to the first OUT instruction except for an additional 1 That 1 turns on the NCO CLOCK input produc ing a positive edge that shifts t
191. es should consume little io or no power They would have to remember all their connections between powerdowns and be fully reprogrammable at any time As you might imagine the semi conductor houses are scrambling to offer new programmable intercon nect devices have listed the key players in this month s resource sidebar Unfortunately nearly all devices offered today miss on one or more objectives Aptix seems to be at the top of the heap Its devices are quite dense extremely flexible bi direc tional analog digital and have low on resistance and crosstalk But they are expensive and have to be reprogrammed each time power is applied to the system Pioneer and Quality offer very low cost and easy to use bi directional bus Switches but their density is very low Programming is external Atesla has arrays of direct intercon nects with blowable fuses They are medium low cost items that offer bi directional analog digital operation But once blown the results are per manent and programming cannot be changed Apparently those programmable logic device manufacturers are re labeling their existing PLA and PLD variations so that they can claim they are interconnects While dense reprogrammable and low priced the functions are often dig ital only and one way only There are also propagation delays to consider One brand new source is Lattice Semiconductor with its Generic Digital Switch shown in Fig 5 D
192. esses You are free to create your own applica tions but leave the addresses ASSEMBLER VARIATIONS In developing the software for this arti cle the intention was to provide a single source file that would assemble correct ly under three assemblers the TECI 6805 Assembler Motorolas 6805 As sembier and Motorola s Freeware As sembier In the course of testing a bug was discovered in the Freeware as sembler After encountering an instruc tion that uses direct addressing on page zero of memory the assembler starts generating garbage Both of the other assemblers force extended addressing thus avoiding the problem The only point in the code where this is a problem is in the jump table where there is the instruction JMAN JMP MAN By changing that instruction as foi lows the problem can be avoided JMAN BRA MAN Branching rather than jumping works because the target routine is with in 128 bytes of the jump table outside that range alone Ad dresses below 80 are reserved for constant and variable stor age addresses above S5FF con tain the reset and interrupt routines All 68705 registers except for the timer are avail able for use by application rou tines Construction Assembly is straightforward Figure 2 shows the parts layout on the single sided circuit board Load the board by insert ing lowest to highest profile Continued on page 76 MON S21UOJI29 3 GEE Menuer Electronics Now Janua
193. etimes fell out of their sockets during shipment Yes small signal semiconductors were plugged into sockets because 1 they didn t stand up well to solder ing heat 2 the manufacturer was unsure about their reliability and C3 they sometimes needed to be changed during component assem bly and final test recently spoke to an old friend who ran a warranty station during this transition period He asserted ELECTRONICS MANUFACTURING u work is done by machines a ae Py ee i sed to be very labor intensive Toda that transistor problems not only caused the demise of many warran ty stations including his own but also drove several hi fi companies into deep financial trouble Aside from the arguments pro and con about transistor sound quality in the hi fi magazines the main consumer concern was equip ment reliability Knowing this at least one manufacturer Dave Hafler of Dynaco held off joining the rush to solid state for at least a year until his products were in his view vir tually bulletproof Guess what His amplifiers ran into trouble anyway including the two that blew up in my living room Several years went by before a combination of better circuit design and improved semiconductors fi nally resolved the reliability ques tion Although today s equipment still breaks down for one reason or another anyone who grew up with vacuum tubes is very much aware of the enormously improved reliabi
194. etters and bro chures Examples show how to include graphic effects like clouds chrome and glass in your drawings The authors also explain how to save time with the program s tabbed dialogs accent art work and per form color shading or tex ture fills You ll also learn how to make 3D extrusions with up to three light sources Op Amps Selection Guide Analog Devices Inc 181 Ballardvale Street Wilmington MA 01887 Phone 617 937 14228 Fax 617 821 4273 free This six page selection guide to Analog Devices single supply operational amplifiers includes key specifications and tech nical information on more than 30 products The bro chure simplifies the selec tion of single dual and triple op amps such as the low power precision in strumentation and low noise models that operate from single 1 to 36 volt supplies ies n Dora Tn D i EN ae CIRCLE 341 ON FREE INFORMATION CARD The guide also explains the available choice of in dustry standard JEDEC op amp packages that Analog Devices offers for various applications Some products are available on tape in reels for surface mount placement Literature Review Eaton Corporation Commercial Controls Division 4201 North 27th Street Mil waukee WI 53216 Phone 414 449 7483 free Sicha CIRCLE 342 ON FREE INFORMATION CARD Eaton s Literature Re view identifies more than 55 catalogs that are avail able from Eaton s many di vi
195. explains the basics of VHF and UHF antenna opera tion and installation The text GESETIDES in easy to understand terms the essential information about how antennas works the advantages of different antenna types and how to get the best performance from an an tenna a Mail to Electronic Technology Today Inc P O Box 240 Massapequa Park NY 11762 0240 Shipping Charges in USA amp Canada 0 01 to 5 00 1 50 30 01 to 40 00 5 50 5 01 to 10 00 62 50 40 01 to 50 00 6 50 10 01 to 20 00 3 50 50 01 and above 8 00 20 01 to 30 00 4 50 Sorry No orders accepted outside of USA and Canada All payments must be in U S funds only E Number of books ordered Total price Of books Shipping see chart Snc EN Sales Tax NYS only Total enclosed Name Address l City State ZIP Please allow 6 8 weeks for delivery L STARCOM VII DPBB QUICK BOARD ics as cable TV sweep systems Of their many offerings you might also find their application note on spec trum analyzers to be handy Real live human neurons are now offered by Stratagene according to its inside cover ad in the September 2 1994 issue of Science If under stand this ad correctly these neu rons can be hot wired for direct electrical to biological neuron com putin
196. f the VCR Cross Reference contains both model and part number cross references Over 1300 new parts and 360 new models have been added VCR s are made in a few factories from which hundreds of different brand names and model numbers identify cosmetically changed identical and near identical man ufactured units Interchangeable parts are very common An exact replacement part may be available only a few minutes away from you even though the original brand name supplier is out of stock Also you may be able to cannibalize scrap units at no cost ISCET VCR CROSS REFERENCE crosses of future models The Fourth Edi tion can be printed on pages completely from the diskette The ISCET VCR Cross Reference Fourth Edition is on 8 x 11 in pre punched pages and sells for 36 00 The 3 inch diskette sells for 69 95 and you can view listings from a monitor or printed page A A d Only 36 tor pages 69 95 diskette Claggk Inc q VCR CROSS REFERENCE OFFER P O Box 4099 Farmingdale New York 11735 Name Business Address City State Phone Enclosed 36 00 for the ISCET VCR Cross Reference Fourth Edition Enclosed 69 95 for the diskette containing the ISCET VCR Cross Reference Fourth Edition Please specify 5 Diskettes 2 3 Diskette 1 Include 3 00 for shipping each Cross Reference Pages or Diskette The total amount of my
197. ff a single 1 5 volt battery Just about the only restriction here is that the circuit output should always see at least a 10K load If that s a problem you can do it with a single resistor The trimmer in the circuit adjusts the duty cycle of the square wave output Shifting the duty cycle will change the sound of the tone This will let two additional circuits pro LM3I0F FIG 1 THIS CABLE TRACER is inexpen sive and the batteries last a long time duce uniquely different sounds and that will let you trace more than one pair of wires at a time This circuit is right from National Semiconductor s data book It is so simple that you can put several of them in a single enclosure and have each produce a different frequency While you could power all of them from a single battery you might want to have a separate battery for each circuit There s always a chance of having some signal leak age and crosstalk through the power supply and even though crit ical audio isn t a concern with your job it s so easy to avoid that you might as well do it anyway Having separate batteries also means that they will last longer It isn t often that a cheap alternative will work just as well as an expensive gadget But when one does it pays to take ad vantage ROBOT CONTROLLER recently bought an 8085 mi croprocessor trainer to build a controller for a robot don t un derstand the instruction set and haven t been able to p
198. fore the clock is started Then keep track of both the base rate and the multiplied rate to get your answer The rate MON S21UOJI29 3 666 Menuer 87 Electronics Now January 1995 amp y Zc 4 Ci 1 4 40 24Hz 01 CLOCKO R O oK o7 0 Qe60Q0 Q50 PFO SPARK COUNTER 3 0 Q2 O Q O QOC GROUND O 7O DISPLAY C ICc 4 4 Ta 97 95 05 04 03 OZ 0l Qo ZC 8 4040 CERRO 28 CERRO Git FIG 3 MULTIPLYING TWO NUMBERS is done by loading the one number at the data inputs and letting the rate multiplier do successive addition a number of times equal to the second number The answer is the total number of pulses at the multiplied rate output multiplier does that by counting up to X repeatedly at the multiplied out put rate and it indicates how often it s doing it at the BASE RATE Output The rate multiplier is really doing successive addition When it is asked to multiply two numbers to gether it repeatedly counts up to one of them and outputs the number of times it does it The rate multiplier needs a clock signal to operate it but surprisingly it doesn t matter what the clock fre quency is Simple algebra shows why this is true Assume that you want to multiply X times Y The base rate input clock 16 The multiplied rate Cinput clock 16 X The multiplied rate X base rate thus X multiplied rate base rate thus X input clock 16 X Cinput clock 16
199. formation to remove head clogging debris No for eign substances such as cloth plastics or messy liquids and no harsh abra Sive materials are present The cleaner s usable life is 400 cleanings or more It s easy to use Place the 3M Black Watch Head Cleaner Videocassette in the VCR and press the Play button A pre recorded message appears clear ly on your screen and an audible tone is heard telling you that the cleaning process is now completed No guess work you never over clean 3M Black Watch Head Cleaner Videocassette SVHS VHS 19 95 Once your VCR s head cold is cured and the unit plays like new consider using the finest videocassette you can buy the 3M Black Watch T120 Hi Pro VHS 4410 Videocassette The 4410 is the highest performing video cassette available today for use with all standard format VHS recording hard ware Here s what you hear and see A sharp clear picture brightest colors freedom from streaks flashes and snow outstanding high fidelity audio re production optimum camcorder performance maintains recording integri ty 3M Black Watch video tape is 100 laser inspected to guarantee surface smoothness and drop out free performance 3M Black Watch T120 Hi Pro VHS 4410 Videocassette VHS 8 00 CLAGGK INC 3M VHS Special Offer P O Box 4099 Farmingdale New York 11735 Yes like your offer and here is my order for 3M Black Watch products 3M Black Watch
200. from General Electric Q MON S9100129 3 66 Menuer Electronics Now January 1995 OPER VTIONAR AMPLIFII RS E Learn how to design with operational amplifiers and put them to work in various analog and audio circuits RAY MARSTON THE OPERATIONAL AMPLIFIER OP amp is a high gain DC cou pled amplifier with a differential input two input leads and a single ended output one out put lead It is one of the most versatile circuits ever invented because it closely approximates the ideal amplifier The versatility of the op amp has made it a key functional building block in linear or ana log circuitry because it elimi nates the need for bulky transformers in many low fre quency and audio circuits This article will focus on the role of the op amp in performing audio signal processing The op amp was developed more than 40 years ago to per form mathematical operations such as addition subtraction integration and differentiation in analog computers Originally a vacuum tube DC amplifier circuit it evolved into a discrete transistor circuit before being made as a monolithic inte grated circuit The availability of mass pro duced low cost monolithic op amps has had a significant im pact on all linear circuitry Op amps are included in both dis crete and monolithic circuits for signal conditioning power regulation active filtering function generation digital to analog conversion
201. function as a differential input amplifier by combining the in verting and noninverting con nections If that differential am plifier is modified so that two or more input signals can be add ed algebraically the op amp be comes a summing amplifier The op amp can also be con figured to act as an integrator differentiator and logarithmic amplifier useful functions for performing analog computer calculations Op amp selection There are many possible vari ations in op amp design and manufacture because of the range of desired options These include temperature range commercial industrial and military manufacturing pro cess e g bipolar BiMOS Bi FET and JFET and package styles e g plastic and ceramic DIP and metal cases There fore it is easy to see why the list of op amps available from so many manufacturers is long and bewildering even for ex perienced professional circuit designers Where required in the ap plication the designer can choose from a wide selection of op amps today Some are pro prietary designs and others are alternate sourced versions of standard products Many op amps are optimized to obtain GAIN A HT sat X mo FIG 5 CLOSED LOOP INVERTING am plifier circuit FIG 6 CLOSED LOOP NONINVERTING amplifier circuit FIG 7 INVERTING AC AMPLIFIER with a gain of 10 49V N P NON POLARIZED FIG 8 NONINVERTING AC AMPLIFIER
202. g experiments Three good weather satellite re sources are MultiFAX Accu Weather and ZFX Harris Publishing has a new 1995 Electronic Industry Telephone Di rectory f it is not already in my Synergetics Master List the EITD is the reference l Il always check first Access to Energy is a labor of love publishing venture that bills it self as a high tech free enterprize monthly newsletter NEED HELP Phone or write your Hardware Hacker questions to Don Lancaster Synergetics Box 809 EN Thatcher AZ 85552 602 428 4073 For fast PSRT access modem 800 638 8369 then an HHH Then JOINGENIE On keyword prompt enter DMD524 Internet email access link SYNERGETICS GENIE GEIS COM I DIAGNOSTIC MODULES LPC 10 PC PIONEER BOARD 3 WIRE___ BA 51XX BA 6G1XX i BA 63XX BA 67XX STARCOM 6 DPV 5XXX STARCOM VII DPV 7 QUICK BOARD JERROLD DIAGNOSTIC CABLE CONVERTER gt 44 95 44 95 A freebie Sil Pad Sample Kit from Bergquist includes several ther mally conductive insulators These insulators are intended for use in the heatsinking of power semicon ductors A free issue of the Seismo Watch Newsletter is available The publica tion is a source of weekly earth quake information The Extraordinary Science 1995 Resource Guide is a new catalog of both real science and pseudos cience books videos and reprints Among other strengths the guide lists a defi
203. generally lower than that of the facto ry lubricated switch and the switch that used no lubricant HH Bm Bn M M Conducto Lube How it works e This is the conductive lubricant highly conductive because it con tains pure silver Originally developed to lubricate Switches to the point tension can be adjusted to factory specs allowing 723 full rated capacity of the switch to be maintained at all times Uses have continued to expland from switches and break ers to any application where a con ductive lubricant is needed Various tests were performed on both products In the Electro Test inc facilities in Portland Oregon during January March 1994 Evaluation of plating thickness ol Cool Amp was performed by Surface Science Laboratories of Mountain View California Conductivity is demonstrated by inserting test prongs into a container of Conducto Lube and establishing a circuit Photo shows low voltage 115 VAC continuity through container CUGL AMP ez Cool Amp Conducto Lube Company 15834 Upper Boones Ferry Road Lake Oswego Oregon 97035 Order factory direct 503 624 6426 Fax 503 624 6436 CIRCLE 228 ON FREE INFORMATION CARD Don t Despair REPAIR Here s how to troubleshoot and repair your electronics successfully You Can Be Your Own Repair Expert For VCRs camcorders audio equipment TV equipment computer hardware office equipment h
204. he program a brief de scription and time remaining as an aid to channel surfers Whether or not to transmit that information is up to ABC s affiliated stations In dex Plus was invented by Gemstar Development Corporation the company responsible for the highly successful VCR Plus recording system The only known previous use of the EDS line is its employ ment by PBS affiliates to set the clocks on three current model Sony VCRs Electronics Now August 1994 Hollywood likes DVD Seven major movie studios have formed an ad hoc advisory group on the dig ital video disc DVD the upcoming medium designed to record 135 minutes of high resolution video on a single five inch disc Columbia Pictures Disney MCA Universal MGM Viacom Paramount and Whats new in the fast changing video industry DAVID LACHENBRUCI aa De I Warner Brothers said that their goal in forming the group was to encour age public and industry discussion of the new medium The group listed six major goals for DVD 1 it must accommodate a full length movie on a single disc 2 Picture quality should be ideally su perior to that of current high end consumer video playback sys tems presumably a reference to laserdisc 3 Audio should be com patible with surround sound and other high quality systems 4 It should be able to accommodate three to five different languages on the same disc 5 Some form of copy protection
205. he value into the NCO You might have to read the preceding paragraphs several times so that you understand how the load subroutine works Once you understood the pro cedure you can program the NCO board to do anything it s capable of doing The rest of the program provides visual enhan cements to the screen display and generally forms a clean con trol panel for the PSG Continued on page 66 al tfia a rint Ae jl mnm mium gh tony tee ene a 4 ple 1 P P Ae P d PAPAE AI i fs ve AL ym RUNI M f gianna Ann j was Eo T 2 t VE a ey lor ur l pe M y mm The new energy saving fluorescent bulbs save money on electric bills but they can interfere with infrared remote controls TOM HEALD I WAS WATCHING A MOVIE ON A CA ble channel one night when sudden y my TV set jumped channels I grabbed my univer sal infrared remote control and tried to switch back to the chan nel I was watching but nothing happened The remote was dead So I went to my cable box and changed the channel back tc the program I was watching However a few minutes later the channel switched again What was going on Nobody else had been near either my remote con trol or cable box Ithen pointed my remote con trol at my TV set reset the chan nel adjusted the volume and tested the mute All three func tions worked Five minutes later the TV
206. hillips Oct 57 PC Based RF Signal Generator Doberstein Mar 35 Apr 61 PIC Microcontroller Programmer Eady Feb 48 Picture Stick The Edwards Oct 35 Power Line Modem for Home Control Keete Mar 57 Hadon Monitor Neher Jan 56 Feb 66 Solid State Disk Drive Hatten Apr 49 Solving the Resistor Cube Muntz Dec 45 Stepper Motors as Shaft Encoders Heckt Feb 53 Sweep Function Generator Carlson Dec 53 Take Back Control of Your Telephone Weeder Feb 33 Jul 67 Teiephone Line Grabber lannini Sep 43 TextGrabber The McArthur Nov 31 Tunable FM Antenna Booster Smith May 49 Tunable Shortwave Antenna Wecke Jul 60 TV Commercial Editor Hurst Aug 31 X Y Plotter Brown May 57 Continuity Tester Adjustable Kennedy C Aug 8 Creating Chaos Sonntag C Nov 47 Crystal Balling the Future Klein AUD May 82 CTCSS Tone Squeiching Lancaster HH Jan 80 Cybermations SCK 2000 Stepper Motor Controller ER Aug 11 Dallas Semiconductor DS1620 Demonstration Kit ER Mar 22 Dangerous Cleaner QA Feb 12 LET May 12 LET Jul 16 David and Goliath or Bill s Bad Awful Day Holtzman CC Jun 27 Decision Maker Elenco Electronics SM 220K ER Apr 16 Demonstration Kit Dallas Semiconductor DS1620 ER Mar 22 Desoldering Tool DIC SC 7000 ER Jan 18 Develop Cool Products Get Rich Quick Holtzman CC Sep 87 DIC SC 7000 Desoldering Tool ER Jan 18 Different Tachometer Design Approach A Grossbiatt DB Sep 84 Digilyz
207. horized by law Satellite delivered pro gramming because it is dis tributed primarily to cable companies is also covered un der the Cable Act The Act clearly mentions equipment used for signal theft It states For the purpose of this section the term assist ing in intercepting or receiving shall include the manufacture or distribution of equipment in tended by the manufacturer or distributor as the case may be for unauthorized reception of any communications service of fered over a cable system For a first offense under the Cable Television Consumer Pro tection and Competition Act of pirates The smart card slot is located on the right side of the integrated receiver descrambler or IRD 1992 Title 47 USC Section 553 a fine of 50 000 and im prisonment of up to two years or both may be handed down A repeat offender can be fined up to 100 000 and imprisoned for more than five years Only a manufacturer or dis tributor of illegal decoders or other descrambling devices is likely to receive imprisonment under the Cable Acts A home owner with no criminal record is not likely to go to jail for il legally connecting to the cable system In many instances the homeowner will be offered am nesty by the cable company and asked to subscribe Our department performs many functions says Bob As tarita vice president of security for Cablevision the fifth largest Multiple Systems Operator MSO in
208. how to Choose the right compo nents for a system to suit your personal needs and fully equip yourself to ex ploit that system O BP245 Digiteal Audio Pro jects 5 95 Practical details of how to construct a number of practical projects All should be of interest to most audio and electronic music enthusiasts Some of the projects are oscilloscope storage circuit A D converter negative supply input amplifier low noise microphone preamp compressor and expander cir Cuits input mixer echo effect circuit and others DIGITAL O PCP107 Digital T aH ise Logic Gates and Flip ITUEESEIBLA flops 10 00 Estab i i lishes a firm foundation in digital electronics by covering gates and flip flops thoroughly Topics such as Boolean aigebra and Karnaugh mapping are explained demon Strated and used k f knr O BP310 Acoustic Feedback How to Avoid it 6 25 Feedback is the bane of all PA systems Much of the trouble is often the hall itself not the equipment but there is a simple and practical way of greatly improving the acoustics Determine which microphone to use Select the correct loudspeaker system Inciudes info on equalizers fre quency shifters and notch and twin notch filters ELECTRONIC TECHNOLOGY TODAY INC P O BOX 240 Massapequa NY 11762 0240 Name Address City EN1 BP321 Circuit Source
209. hure describes 3M s new pleated foil covered input output cable for computer data transmission commu nications and instrumenta tion data transfer The cable assembly includes the 3M miniature delta rib bon MDR connector and pleated foil cable PFC Its durable construction is said to offer high signal density excellent electrical performance and EMI shielding E Pleated Bord arene LTI Calia Asoo ins i halt s o A d CIRCLE 337 ON FREE INFORMATION CARD The brochure includes a cross section illustration of the MDR PFC assembly a chart outlining the cable as sembly s electrical proper ties color illustrations and complete cable ordering in formation Need a Cellular Phone But Where Do Start Motorola Cellular Informa tion Center Phone 800 331 6456 extension 2904 tree A cellular phone is a valu able time saving con venience for anyone who must travel extensively and yet stay in touch with a I know I need a cellular phone Where do I start at thei ae so many to chao from It has to be depeadabie And easy Allordabie of course Marys has cali holding t have a lot of questions CIRCLE 338 ON FREE INFORMATION CARD home office or operations base customers clients or prospects But buying a phone subscribing to a cellular telephone compa ny and selecting a service plan can be daunting even for sophisticated people Motorola s brochure lists tips to keep i
210. ible 12 VDC Operation 15 75 KHz Horiz Freq 60 Hz Vert Sync Freq Open Frame Construction Standard Interface Connector Degaussing Coil Included Mfg Samtron CHARGE COUPLED DEVICES j tust MATRIX TYPE gt The Spy In The Sky 49 Sony CCD Imager designed for black and white composite video cameras Picture elements 384 H x 491 V Chip size 10 7 H x 9 3 V mm Unit cell size 23 0 H x 13 4 V um Ceramic 24 pin DIP package Mfr Sony Part 016A 4096 element CCD 29 00 2048 element CCD 15 00 1728 element CCD 15 00 ao erar HACKER CORNER Proxim Spread Spectrum RF Modem goo The Proxlink is a small communication device that replaces the ust cable hook up with wireless Radio Frequency technology Each mo the functions of an RS 232 compatible modem or any other RS 232 vansmitter receiver operating in the 902 928 MI z band Indoor rang 4 Lem feet possible using standard 1 4 wave antenna Units support data r oO zo KBaud full duplex and uses multiple channels to diee form ONA overlapping systems Message format is 8 data bits no parity and YDIN unit requires VDC supply at a maximum of 230 mA A wi P ui 91 configurations can be accommodated with parameters stored ii s 0 memory EEPROM Configuration changes are supported by m pw e board software Installation schematics and application details C o zi Original cost on the
211. ibuted throughout the circuit The first section consists of the out put impedance of DAC IC3 R7 R8 and C3 The second is com prised of R13 the output im pedance of the transconduc tance amplifier the input im pedance of the complementary PARTS LIST All resistors are watt 5 un less noted R1 R5 10 000 ohms R6 100 000 ohms R7 500 ohms inch round sin gle turn cermet trimmer potenti ometer R8 120 ohms R9 2000 ohms inch round sin gle turn cermet trimmer potenti ometer R10 390 ohms R11 R14 R16 1000 ohms R12 4700 ohms R13 470 ohms R17 39 ohms C1 C2 C5 C7 C11 C12 0O 1p F ceramic C3 C8 47 pF 5 ceramic NPO C4 22 pF 5 ceramic NPO C9 150 pF 596 ceramic NPO C10 47 uf 25 volts electrolytic C13 22 uF 25 volts electrolytic C14 560 uF 16 volts electrolytic Semiconductors IC1 74HC245 octal non inverting bus transceiver IC2 HSP45102 12 bit numerically controlled oscillator Harris IC3 CA3338A 8 bit DAC Harris IC4 NEL HS501 32 MHz clock os cillator module Mouser No 332 3320 or equivalent IC5 MAXA36 wide band trans conductance amplifier Maxim IC6 7805 5 volt regulator TO 220 package Motorola or equivalent IC7 LM2574 5 inverting switching regulator National Semiconduc toror equivalent D1 D4 1N4148 diode D5 1N4001 diode D6 1N4933 fast rectifier diode Motorola or equivalent Q1 2N4401 NPN tr
212. icrocontroller deliv ers a 10 microsecond negative going pulse to port PB7 That pulse briefly enables the tran sistor which causes current flow through the LED inside C4 Although a Motorola MCP3011 Triac driver was used in this design any similar de vice could be used as long as it doesn t have an internal zero crossing detector That type of driver allows only two modes of operation full on and full off The Triac drivers LED then triggers the photon coupled Tri ac within the IC which in turn triggers TR1 and delivers power to the externalload Resistor R5 provides current limiting for IC4 and R6 and C7 form a snubber network to filter line transients that could cause tae Triac to trigger falsely The hot side of the power line connects to the MTI terminal of all the power Triacs TRI TR8 The specified Triacs are rated for 4 amperes at 200 volts They are isolated tab versions and were selected because heatsinking is mandatory With the specified Triacs the maximum load is 100 watts per output Larger loads can be handled by sub stituting Triacs with higher cur rent ratings Be sure to use proper heatsink and isolation techniques Input circuit The input circuit consists of Ports A and C of the micro controller along with two banks each of DIP switches S1 and 52 SIP resistors RN1 and RN2 four sets of O 1 inch head er jumpers P1 P4 for mode se lection a 14 pin header P5 connected
213. idity amp EMF adapter Sound level meter Frequency counter SWRifield strength power meter Dip meter lt x x 4 Shi E 4 amp 20 MHz Oscilloscope with Delay 20 MHz Digital Storage Sweep PS 205 429 95 Oscilloscope DS 203 729 95 Dual Trace Component test 6 CRT X Y Operation TV Switchable between digital and analog modes Sync Z Modulation CH2 Output Graticule Illum 2 probes 2 K word per channel storage each has x1 x10 switch Best price with delay sweep Sampling rate 10 M sample sec PS 200 20 MHz DUAL TRACE 339 95 8 bit vertical resolution 25 Lerel div PS 400 40 MHz DUAL TRACE 494 95 Expanded Timebase 1O0ms div 0 5 s div PS 405 40 MHz DELAY SWEEP 569 95 Refresh Roll Save all Save CH2 Pre Trig PS 805 60 MHz DELAY SWEEP 769 95 Plotter Control Scope Probe 60MHz x1 x10 13 100MHz x1 x10 22 250MHz x1 x10 29 250MHz x100 39 DC Power Supply nen ma ee DC Power Supply Triple Output aS ie PS 303 159 00 PS 8202 499 95 0 30 VDC 0 3A output Moe WL LUNA On m Two 0 30 VDC 0 3A outputs Constant voltage amp constant curentmode MEITN E PRS E gt One fixed 5VDC 3A output 0 02 2mV line regutatton M Capable of independent or tracking operation 0 02 3mV ioad reguiation v7 d 7I aa _ Constant voltage and constant current mode 1 m
214. ield is made possi ble by a video VHS presentation that you cannot view on broadcast television sat ellite or cable It presents an informative program prepared by professionals in the field who know their industry its tech niques kinks and loopholes Men who can tell you more in 45 minutes in a straightforward exclusive talk chan was ever attempted before Foiling Information Thieves Discover che targets professional snoopers seek out The prey are stock brokers arbitrage firms manufacturers high tech companies any competitive industry or even small businnesses in the same community The valuable informa tion they filch may be marketing strat egies customer lists product formulas manufacturing techniques even adver using plans Information thieves eaves drop on court decisions bidding information financial data The list is unlimited in che mind of man es pectally if he is a thief You know that the Russians secretly installed countless microphones in the concrete work of the American Embassy building in Moscow They converted r i i i i i i l i i i Total enclosed I I i I i i L 1 516 293 3751 HAVE YOUR VISA or MC CARD AVAILABLE what was to be an embassy and private residence into the most sophisticated re cording studio the world had ever known The building had to be torn down in order to remove all the bugs Stolen Information
215. ience and can greatly re duce the time required to complete Program and reach graduation No residence schooling re quired for qualified Electronic Technicians Through this Special Program you can pull all of the loose ends of your electronics background together and earn your B S E E Degree Up grade your status and pay to the Engineering Level Advance Rapidly Many finish in 12 months or less Students and graduates in al 50 States and throughout the World Established Over 40 Years Write for free Descriptive Lit erature COOK S INSTITUTE OF ELECTRONICS ENGINEERING cI E 4251 CYPRESS DRIVE JACKSON MISSISSIPPI 39212 CIACLE 58 ON FREE INFORMATION CARD Earn 1000 A Week While You Learn High Paying VCR Repair Earn While You Learn Sam Revealed 503 681 0118 Pioneer Semiconductor 2343 Bering Drive San Jose CA 95131 408 435 0800 Quality Semiconductor Train at Home If you are able to work with small hand tools and pos sess average me chanical ability you could earn top dol completely Fingerprints can cause a high temperature spot on the glass leading to mechanical stress and a possible darkening More over a cooling off period is man datory for the halogen cycle to 851 Martin Ave lar part time or full Santa Clara CA 95050 i cod fhereemignt be a time eie um le read lepida 408 450 8063 y te work on VCR s without boring unnecessary quality control problem Or m
216. ific Atlanta Jerrold Zenith Pioneer Quality Price and Service COD Visa M C AmEx EAGLE ELECTRONICS INC 1 800 259 1187 1 1301 Railhead Blvd Naples FL 33963 CABLE TV converters amp accessories Whole salers welcome 30 day moneyback RE Free catalog PERFORMANCE ELECTRONICS INC 1 800 815 1512 RESTRICTED top secret hacker information Cel lular cable surveillance satellite more Cata log 3 00 TELECODE PO Box 6426 EN Yuma AZ 85366 6426 DESCRAMBLE cable with simple circuit added to Radio Shack RF modulator and using VCR as tuner Instructions 10 00 TELCOM Box 832 E12 Brusly LA 70719 CABLE test chips Jerrold Tacom S A Zenith Puts cable boxes into full service made are to 88 85 1 800 452 7090 310 302 084 SECRET cable descramblers Busd your own descrambler for less than 12 00 in seven easy stepa Radio Shack paris list and free descram bling methods that cost noting bo tng Toveluded Send 510 08 to INFORMATIO TORY PO Box 669 Seabrook TX 77586 For CODs 713 922 3512 any time 300 Experimenters Circuits Complete in 6 practical books using diodes relays FET LED s IC 555 s and IC CA31305 for buildin blocks Only 33 00 plus 5 50 for shipping US and Canada only US funds ETT INC PO Box 240 Massapequa Park NY 11762 0240 CONVERTERS DESCRAMBLERS 30 DAY MONEY BACK GUARANTEE ORDERS SHIPPED WITHIN 24 HOURS HAVE MAKE amp MOD
217. igit LED dispiay with Hz KHz and gate for internal frequency only TTL and CMOS outputs Gate time 0 1 sec 1 sec and 10 sec Accuracy 30 ppm one count Output 5mV p p to 20V p p open circuit DC offset 10V to 10V with CAL SW Duty cycle 2096 to 8096 with CAL SW Voltage controlled frequency VCF input of 0 10V Includes test lead AC power cord and manual Dimensions 4 1 4 H x 8 1 2 W x 11 D Net weight 5 Ibs EN 390 640 Technician s Turntable Turntable to speed repair of VCRs TVs and more Allows technician to easily turn unit for convenient re pair Dimensions 20 W x 15 D x 1 1 8 H Black pebbled surface In cludes 4 anti skid adhesive feet Net weight 9 Ibs EN 360 427 M E C P Study Guide This book is the most comprehensive study guide available for the Mobile Electronics Certification Program Endorsed by the Mobile Electronics Association the M E C P Study Guide covers electronic theory and principles car audio security and cellular installation This program is designed to test installers at various levels of ability allowing them to SS earn Installer First Class Specialist and Master Installer certificates It also serves as the perfect reference manual for anyone interested in mo bile electronics Copyright 1993 Net weight 1 1 2 Ibs EN 500 230 EACH Parts Express 340 East First St Dayton Ohio 45402 Local 513 222 0173 106 FAX 513 222 4644 30 day money
218. ilable taped on reels for placement with those machines The TC4 1W trans former is priced at 4 95 each Mini Circuits P O Box 350166 Brooklyn NY 11235 0003 Phone 718 934 4500 Fax 718 332 4661 N CHANNEL POWER MOSFETs The TO 264 family of N channel TMOS Learnin your own home at your own pace With training from CIE you could be working at the job you want earning the money you deserve CIE lets you learn electronics right in your own home at your own speed You can complete your CIE coursework while you re still at your current job You can complete it as fast or as slowly as you choose And the faster you finish the more CIE can help you save money Take your place on the Information Superhighway CIE training or a CIE degree will qualify you to be part of one of the hottest fastest growing fields around electronics And you ll play a major role in keeping the nation s much discussed Information Superhighway up to speed and running smoothly Learn from the world leader in home study electronics At CIE we teach electronics and nothing but electronics We re not only the biggest home study electronics school but also the best And why not We ve been teaching it for 60 years We ve graduated more than 150 000 people from over 70 countries And we re fuily accredited That s why employers and CIE graduates alike know the value of electronics training from CIE Concentrate on your own
219. ime whether busy or answered your cholce and log the times commands and results Ip monitor printer and or disk Quick dial directory of up to 600 numbers BUSY redial options Direct modem Command and con trot AJ Result Codes including VOICE and RINGING Optional shell to terminal program upon CONNECT Exit to menu or DOS for batchin 1 Manual Disk 29 COMPUTER PHREAKING Describes in detail how computers penetrate each over and how VIRUSES TROJAN HORSES WORMS etc are implemented Dozens of computer crime and abuse methods and countermeasures Includes disk filled with hacker text files and utilities and the legendary FLU ISHOT protection sysiem Ed Choice PC Magazine QBS advice password defeats glossary much morel Manual Disks 39 BEYOND V4N ECK PHREAKING avesdropping On iV and computer video Signals using ian ordinary TV includes security industry reports Range up to 1 KM Plans Include both the Consumertronics and Ihe original Top Secret Van Eck deslonsi 29 CRYPTANALYSIS TECHNIQUES Five powertul menu dnven crypto programs n their BAS sources to analyze decrypt secure ci iphertexts Worked out examples hecommended by pres Y lous Computers amp Security Manual Disk 29 By an ORDER of the MAGNITUDE The most comprehensive hard hliting hi tech Sur Fvivai book ever wrliteni Topics include electronics computers energy weapons conceaiment reven Uni
220. in the seizure of 400 000 illegal decoders Another organization that I assisted in forming is the Coali tion Opposing Signal Theft COST Nix said COST was set up as a joint venture be tween the NCTA and the MPAA and was designed to address is sues in the area of signal theft Many of the more than 10 000 cable operators are members in the OCST and COST which is part of the OCST advisory com mittee Mr Astarita is the cur rent vice chairman of COST The inside problem When first moved into Man hattan the cable technician who hooked me up asked if I wanted to do this the legal way or the illegal way said HBOS Matthew Sappern For some cash the cable tech nician was offering to hook up the premium channels for Sap pern who would thereafter re ceive them for free Sapperns experience is by no means an isolated one Moreover the largest source of illegal decod ing devices on the black market today is cable operators them selves It is estimated that as much as 90 of the market in illegal decoders can be traced back to the cable operators It should be noted that in many instances a cable operator who is upgrading his equipment will unknowingly sell his existing inventory to a distributor who in turn will divert the inventory to an illegal use We at Cablevision are aware that a great deal of the illegal product comes from within Astarita explained Cablevi sion monitors what happen
221. ing hold continuity beeper input warning beeper fused input protection battery saver Consolidate your test bench with one meter that does it all Wavetek s high performing full function XT Series DMM It s all in one compact rugged field ready package with a big 0 7 inch 3 2 digit display Insulated probes and alligator clip leads are included and there is a huge selection of ou accessories including current Mar re 20H rf and HV probes temperature pes Me Mom c m converters holsters and cases Ask for Wavetek DMMs They re DM27XT the meters to pick when you e il anm Vno tdmen Lom taa have things to fix aeee 9e di LN LN f et ae lt m Other XT Series DMMs from 89 95 U S A 619 279 2200 Europe 44 243 531323 Asia Pacific 852 865 1903 1993 Wavetek Corparanon AVANT RE CIRCLE 98 ON FREE INFORMATION CARD MON S21U0J129 3 GEE fenuerm Electronics Now January 1995 MN From the Lab foyour Living Room Ss Does your VCR have a Head Cold Probably not However through constant playing and using of degrading dry or wet cleaners the output of your video tapes has slowly diminished to an unacceptable level and the VCR plays as if it has a head cold The culprit is most likely clogged and dirty video and or audio heads The 3M Black Watch Head Cleaner Videocassette uses a patented mag netic tape based cleaning
222. ious time and money Guaranteed The standard for simplicity and power for over six years Electronics Workbench is the most popular tool of its kind It has gained worldwide acclaim as the ideal complement to any test bench Fact Over 90 of our customers recommend it to their friends and colleagues MORZZONTAL i29 out Analog Module Turing an RF front Electronics Workbenclr Thee cdnigronice 15b o g Con Just 299 For DOS Windows or Mac Version zy VISA amp my 3 us Electronics Workbench The electronics lab in a computer Call 800 263 5552 INTERACTIVE IMAGE TECHNOLOGIES LTD 908 Niagara Falls Blvd 068 North Tonawanda NY 14120 2060 ac Telephone 416 361 0333 FAX 416 368 5799 1 NN WIV 30 day money back guarantee dH SWIZZ Prices In U S dollars skipomg 15 Offer valid in U S and Canada only MiROSOF T mises ae ome que eom Ke qu Qua INTERACTIVE CIRCLE 126 ON FREE INFORMATION CARD Electronics Now January 1995 N Vol 66 No 1 ONTENTS JANUARY Y SE EINEGEENCEELLI UO THIS i dD BuiLp THE RETRO REMOTE dM Crip Tester This inexpen sive IC tester is Signal theft has been around ever since signal scram easy to build bling was introduced Today the cable industry estimates and yet quite that it loses more than 4 billion to signal pirates each versatile year More serious than an individual p
223. iper measures in either inches or millimeters from 0 to 6 inches or 0 to 150 millimeters Five digit LCD display Serial outpu for computer interface and printing Made of stainless steel with precision ground lapped measuring surface and epoxy embedded linear scale to ensure precise measurement Includes deluxe hard case battery and manual Weight 1 Ib Skew Driver Pro This unique ess m tool oe Pp pp features a gear driven offset bit driver to be used in tight spots or where conventional screwdrivers just won t fit Includes 1 4 and 3 16 slotted bits T15 Torx bit and 2 phillips bits that are contained in the handle compartment Can also be used with a 1 4 electric drill Made in the U S A Net weight 1 2 Ib EN 360 178 39 34 6 UP 1 5 901V1V5 e J MON S21001 129 3 G66 Menuer Electronics Now January 1995 108 1 YEAR WARRANTY 15 DAY MONEY BACK GUARANTEE ew the Test Instrument POWER SUPPLY irin we a COMETE Four Instruments in One Instrument MT 100 1 Function Generator Power Supply Sine Square Triangle Pulse e 3 1 2 Digit LCD Skewed Sine Ramp TTL e Triple output 1 0 50V 0 5A MAX Reg 599 e 0 2 Hz 2MHz 82 15V 1A 43 5V 2A 4 Digital Multimeter e 3 1 2 Digit LCD DCV ACV Q DCA ACA 0 5 2 dgts F C t 399 00 2 reguency ounter e 1 Hz 100MHz e 1 Hz 1 dgt Time Base Error
224. irating a cable MEUM RIED signal are the Vm d PnocRAMMABLE SINEWAVE commercial es GENERATOR tablishments who a Generate redistribute pro rte e gramming to oth ers for a fee and cable company employees who do their part to nva Od ISOLATION TRANSFORMER Isolate yourself from the AC make a quick line when you buck As the cable es electronic and SALSE Tv iem im industries prepare Doyle for new interactive technologies they have become in Whisenant creasingly aggressive in trying to thwart the pirates a 68 Power ConTROLLER Use a 68705 microcontroller to control eight T channels of tet 120 volt AC power Richard L Roane a M _ As a service to readers ELECTRONICS NOW publishes available plans or information relating to newsworthy products techniques and scientific and technological developments Because of possible variances in the quaiity and condition of materials and workmanship used by readers ELECTRONICS NOW disclaims any responsibility for the safe and proper functioning of reader built projects based upon or from plans or information published in this magazine Since some of the equipment and circuitry in ELECTRONICS NOW may relate to or be covered by U S patents ELECTRONICS NOW disclaims any liability for the infringement of such patents by the making using or selling of any such equipment or circuitry a
225. it or the couplings between the con duit and the objects From this mechanistic point of view increas ing bandwidth is seen as the primary means of increasing efficiency In reality this results in an ever esca lating desire for faster computers and higher resolution video screens as well as smarter users But suppose we had computers of infinite speed and output devices of infinite resolution Would comput ers be any easier to operate In the absence of other changes the an swer is a resounding No POV3 or user interaction design does not discount the need for greater computing power and reso lution But rather than putting the objects first it views their interac tion their environment and their Gestalt as primary Gestalt is a German word im MON S9310040129 3 66 Menuer 2 Electronics Now January 1995 ported into English by turn of the century psychologists who sought to surpass the mechanistic New tonian notions prevalent in the dominant theory of the time associ ationism Associationism holds that perception is the summation of nu merous acts of sensation The prob lem was that the associationists failed to show how electrical im pulses in nerves translated into con cepts such as life love or God Borrowing from then emerging concepts of field theory Gestalt theory posited in contrast that ap prehension of the whole cannot be reduced to the mere sum of the parts Quite the opp
226. it for that Pro essional look XLA CASE KIT XANDI ELECTRONICS BOX 25647 TEMPE AZ 85285 5647 TAL CO ORDERS FROM THIS FEDERAL TUBES r FIBRE OPTIC These US mode tubes are pulls from equipment in excellent condition Have 25 40mm diameter fiber optically coupled input and output windows The 25mm tube has on overall diameter of 57mm and is 60mm long the 40mm tube hos an overall diameter of 80mm ond is 92mm long The goin of these is such that they would produce o good image in approximately 2 moon illuminotion when us with suitable fast lens but they con also be IR assisted to see in total darkness Our HIGH POWER LED IR ILLUMINATOR kit and the IR filter are bath suitable for use with these tubes The superior resolution of these tubes would moke them suitable for low light video preamplifiers wild life observation and ostro nomical use Each of the tubes is supplied with an 9V EHT power supply kit INCREDIBLE PRICES 8 5 For the 25mm intensifier tube and supply kit 3 30 For the 40mm intensifier tube ond supply kit We also hove a good supply of the same tubes that may have a small blemish which is not in the central viewing area 50 For a blemished 25mm intensifier tube and supply kit 70 For a blemished 40mm intensifier tube and supply kit INTENSIFIED NIGHT VIEWER KIT See in the dork Make your own night scope that will produce v vision in sub st
227. it operational which we provide in kit form Draws 20mA from a small 9V battery With a suitable low light objective lens Not provided the resultant viewer will produce useful pictures in sub moonlight illumination and it can also IR assisted ON SPECIAL 90 For the Russian image intensifier tube and an EHT power supply Kit Ail that is needed to make a complete possive night viewer is a lens an eyepiece a 9V battery a case and a switch ALL PRICES ARE IN U S DOLLARS HIGH POWER LED IR ILLUMINATOR This kit includes two PCB s oll on boord components plus cosing Switched mode power supply plus 60 high intensity 880nM Invisible LED s Variable output power 6 20VDC input suitable for illuminating IR responsive CCD comeras IR night viewers etc Professional performance at a fraction of the price of the commercial product COMPLETE 44 VIDEO TRANSMITTERS KIT PRICE Low power NTSC standard UHF TV transmitters Have audio and video inputs with adjustable levels a power switch and o power input socket 10 14V DC 10mA operation Enclosed in a small metal box with an attached telescopic antenno Range is up to 304 with the telescopic antenna supplied but can be increased to approximately 100ft by the use of a smoll directional UHF antenna INCREDIBLE PRICING 18 INFRA RED FILTER A very high quolity IR filter ond a RUBBER lens cover that would fit over
228. ith any scanner that amp we can receive 400 to 550 MHz T 800 950 MHz SCANNER CON VER TER KIT If your scanner can receive 400 550 MHz just add the XLC900 for uninterrupted 800 950 MHz cover 550 MHz So your scanner can receive them Add Our custom case kit for that Professional look XLC CASE KIT CIRCLE 281 ON FREE INFORMATION CARD SEND MAIL ORDERS T0 Transmit high quality stereo to any FM stereo receiver Buill in output level monitor Bu for quick and easy tuning Ideal for use with personal CD player FM STEREO TRANSMITTER Transmit tull bodied Hi Fi stereo to any FM stereo receiver Separate left and right inputs and gain controls Inciudes an output booster stage for greater range XFS CASE KIT 13 95 XFS108 C KIT RETE e Use with any FM broadcast receiver Hear every sound in an entire house e Up to 1 mie ange ie t Powerful 2 stage d audio amplitier wu MINIATURE FM TRANSMITTER The XFM100 has a Super sensitive microphone and is capable of picking up sounds at the leve of a whisper and transmitting them to any FM broadcast KI XFM100 C Kit Works with mos any scanner 1 10 TO 1000 MHz h e 10 dB typical gain 3 dB typical noise figure a 10 1000 MHz AMPLIRER Designed to help scanners with poor sensitivity pull in those weak Signals Inctudes OFF BYPASS switch for returning to normal operation and front panel pain control Add our custom case k
229. ithin one year 1096 discount for 12 issues within one year if prepaid NON COMMERCIAL RATE for individuals who want to buy or sell a personal item 1 25 per word prepaid no minimum ONLY FIRST D AND NAME set in bold caps at no extra charge Additional bold face not available as all caps 30 per word additional Entire ad in boldface 1 85 per word TINT SCREEN BEHIND ENTIRE AD 1 90 per word TINT SCREEN BEHIND ENTIRE AD PLUS ALL BOLD FACE AD 2 25 per word EXPANDED TYPE AD 2 05 per word prepaid Entire ad in boldface 2 45 per word TINT SCREEN BEHIND ENTIRE EXPANDED TYPE AD 2 55 per word TINT SCREEN BEHIND ENTIRE EXPANDED TYPE AD PLUS ALL BOLD FACE AD 2 95 per word DISPLAY ADS 1 x 2V amp 225 00 2 x 2ve 450 00 3 x 2W 675 00 General Information Frequency rates and prepa ment discounts are available ALL COPY SUBJECT TO PUBLISHERS APPROVAL ADVERTISEMENTS USING P O BOX ADDRESS WILL NOT BE ACCEPTED UNTIL ADVERTISER SUPPLIES PUBLISHER WITH PERMANENT ADDRESS AND PHONE NUMBER Copy to be In our hands on the 13th of the fourth month preceding the date of Issue I e Sept issue copy must be recelved by May 13th When normal closing date falis on Saturday Sunday or Holiday issue cioses on preceding work day Send for the classified brochure Circle Number 49 on the Free Information Card ROLL your own pentium and save Complete how to where to clone building bibles Free cata log DIGATEK Suite 25 2723 We
230. ke use of opera tional amplifiers available to hobbyists Text in cludes low noise low distortion ultra high input impedance tow slew rate and high current types PCP105 Make Money from Home UHF 6 00 From installing a TV or FM antenna to setting up a multi antenna array for shortwave listening or amateur radio this book explains the essential basics of antenna operation and instal lation The text describes in easy to un derstand terms the necessary informa tion about how antennas work the advantages of different types and how to get the best performance EIRE RE PODE Recording 10 00 Start earning Hini brut money after you spent a fortune on all that professional recording gear MIDI 22 Sand all Here s the book that teils you Pa z how Whether you have a fully fledged recording studio at home or just a cou ple of stereo cassette recorders and a microphone you ll be able to put the ideas presented in this book into imme diate practice and make money BP277 High Power Audio Amplifier Con struction 6 25 Prac tical construction details of how to build a number of useful audio power amplifiers ranging from about 50 to 400 watts rms Text includes MOS FET and bipoiar transis tor designs O BP176 TV DXers Handbook 7 95 The text includes many units and devices that have been designed and used by active enthusiasts and often considerable ingenuity
231. l umn 3 of Table 1 lists some of its typical characteristics Linear amplifiers There are many ways to con figure op amps as linear ampli fier circuits Although the 741 series op amps is specified in the schematics discussed in the remainder of this article all of the op amps discussed here will work in these circuits Figure 7 shows an op amp or ganized as an inverting AC am plifier with an overall voltage gain of 10 Noninverting input pin 3 is grounded through re 49V 2 C1 IC1 0 470 741 T i 100K R1 xf 4 0 470 sistor R3 It has the same value as R2 to preserve the op amps DC balance Input impedence Zin equals the value of resistor RI Figure 8 also shows the 741 configured as a noninverting AC amplifier with an overall voltage gain of 10 However in this circuit modification re sistors R1 and R2 are isolated from ground by nonpolarized capacitor C2 At normal operating frequen cies C2 has a low AC imped ance so voltage gain is still set by the ratios of R1 and R2 How ever inverting input pin 2 re ceives all of the DC negative feedback through R1 giving the circuit excellent DC stability Again for optimum biasing resistor R3 should have the same value as R1 The op amp s input impedance Zy at nonin verting pin 3 is several hundred megohms but it is shunted by resistor R3 which reduces the circuits overall input imped ance to approximately a 100 kilohms value Figure 9
232. l storage oscilloscope module for an IBM PC AT Cor better compatible computer XT compatibles are too slow to be used successfully with the scope module The module connects to a PC s printer port and converts the computer into a single channel dig ital storage oscilloscope Allison Technology Corp 8343 Carvel Houston TX 1703 6 713 777 0401 The O Scope can display input signals from DC to 22 kilohertz and freeze the display at any time The plot can then be printed or saved to disk for later use or for inclusion in other programs Vertical resolution ranges from 10 volts per division down to 50 millivolts per division Sweep rates from 100 seconds per division to 500 microseconds per division can be selected Digital sig nal processing allows the sweep to be expanded from X2 to x16 The O Scope also numerically displays voltage frequency and period measurements in an on screen table The voltages include peak to peak average peak mini mum and RMS In addition a 128 point Fourier spectrum analyzer mode permits the display of fre quency spectrum information from DC to one half of the set sampling rate A single channel 22 kilohertz os cilloscope is not the most versatile of instruments but for the amateur electronics enthusiast O Scope l s bang for the buck can t be beat The unit sells for 169 95 fully as sembled in a shielded plastic case and for 119 95 as a kit without the case which
233. lars You Save To obtain the information contained in che video VHS cassette you would attend a professiunal seminar costing 350 750 and possibly pay hundreds of dollars more if you had to travel to a distant city to attend Now for only 49 95 plus 4 00 P amp H you can view Countersur veillance Techniques at home and take refresher views often To obtain your copy complete the coupon or call MON S2Iu0J 298I3 S661 Menuer Electronics Now January 1995 S VIDEO NEWS leave a message at the tone Transmitted messages or pictures are automatically recorded on the Viewcam s Hi8 cassette which per mits up to two hours of audio or video information The system uses JPEG Joint Photographic Experts Group stan dards has compression ratios of 20 15 and 8 to 1 depending on the transmission speed has a screen resolution of 384 x 240 pix els and transmits images at 9600 7200 4800 and 2400 baud Sharp thinks it will find many uses in busi ness where it s necessary to trans mit detailed color images as well as for personal use sending baby pic tures to Grandma etc The system isn t exactly cheap the camcorder lists at 2500 the teleport at 900 And of course it takes two to tango Q TRY THE NEW BBS 516 293 2283 COMMUNICATE WITH OTHER READERS OF ELECTRONICS NOW DOWNLOAD ARTICLE RELATED FILES AND SOFTWARE V 32 V 4ebis 916 293 2283 POWER CONTROLLER then tur
234. le Wires 3 001 919 95 Inan emergency help isnt on the way unless someone calls So before you press on their chest breathe in their mouthoreven check their pulse call 9 1 1 oryourlocal emergency number Build a real walking robot zu 800 374 5 64 Request our FREE Muscle Wires Technical Brochure To Order Tem Send dee Mo OF Credit card info 524 San Anselmo Ave 3107 73 All order Sadd San Anselmo CA 94960 5 00 P amp H Questions 415 455 9330 fe or Fax 415 455 9333 ders also Internet info mondo com Sales fax To learn more about life saving techniques call your Red Cross Red Cross 24 T Voice Order Line VISA MasterCard International Orders Welcome First Closs P amp H 11 00 B amp S SALES CALL 810 566 7248 FAX 810 566 7258 24 hrs Hours Monday through Friday 8am to 7 30pm EST Saturday 10am to 3pm 51756 Van Dyke St 330 Shelby Township MI 48316 Gree Caleulator with order CONVERTER 5 10 5 10 PANASONIC TZ PC 145362 68 64 DRX 3PJ E dis 37 253 1 WAVEMASTER 65 BOO DEZ PU a Te am mS 38 34 DRZ 3 A amp B DUAL INPUT 39 35 8528 PJ 45 42 CONVERTER DESCRAMBLERS 5 10 5 10 8600 De ex po mde 5098 265 DPVsS3s LENA ale EUN 145 130 v NN Mies FOIE nar n 260 250 DRS RM 125 110 88804 eun tus Sitat 195 185 DRZ 9 DIO ote neem 95 85
235. le benefit ing millions of people at home and around the globe The dedication energy and unique creativity of each honoree should serve to in spire and motivate all Americans Each medalist deserves special rec ognition as models for the new American economy More advanced semiconductor IC plants The Fujitsu Advanced Micro De vice CAMD joint venture FASL has opened a factory for the production of flash memories in Japan The memory devices will be fabricated with 0 5 micron design rules FASL expects that the 750 mil lion plant at full production will pro duce more than 5000 eight inch silicon wafers weekly The 280 000 square foot plant is expected to em ploy somewhere around 400 people when it is fully operational In a related announcement Mi cron Technology said that it would spend 1 3 billion to build a new 200 acre manufacturing plant prob ably at Boise Idaho where the company is now based The largest expansion ever the plant would double the company s manufactur ing capacity Construction of the new plant is expected to begin in the first quarter of 1995 and it is ex pected to employ 3500 people when it is complete Wavetek to Acquire a Schlumberger Division Wavetek Corp has agreed to ac quire the worldwide assets of the Schlumberger Communications Test Division CTD These include both the Radio Communications Test Equipment Business located in Germany and the Telecommunica
236. le boxes TV sets VCRs and stereos also switch in the 50 to 100 kilo hertz range to transmit binary data to receiving circuits built into those products We woke up one morning and our sets didn t work re ports Don Lowry Matsushita Electronics director of engi neering Each case is a little bit different but our counter measures have been effective in managing all of them The latest infrared receiver circuits in consumer electronic 10 10 10 10 10 to INFRARED ULTRAVIOLET GAMMA RAYS p e VISIBLE LIGHT X RAYS eH products include automatic gain control AGC and a clock ing circuit that isolates the re mote control signal from spu rious infrared radiation Some circuits look at the signals cen ter frequency and pulse width and reject all infrared tran sients that are shorter than val id code signals In addition the latest prod ucts have better infrared shield ing that limits the view from the infrared receiver to a narrow cone of energy incident at the front of the host equipment We re trying to find an in frared interference prevention scheme that will be acceptable to all manufacturers reported Tom Mock speaking for the Electronics Industries Associa tion EIA in Washington DC Its Consumer Electronics Group includes representatives of lighting and consumer elec tronics manufacturers MON S21U04129 3 566 Menuer Electronics Now January 1995 Lights Tested
237. lephone Inter active television will allow the subscriber to interact with the television In the envisioned systems the interactive cable subscriber will be able to talk face to face with his neighbor or his employer shop and bank from his television and view conventional television pro gramming as well Virtually all of the signals for interactive TV will be digital In June 1994 British televi sion viewers got their first intro duction to interactive televi sion Two commercial broad casters Carlton Television and London Weekend Television joined forces with a cable oper ator to offer an experimental in teractive London news channel The cable operators 65 000 subscribers can choose from four channels of programming to concentrate on weather traf fic community and social ac tion reports or the regular news program In 1995 the cable op erator hopes to introduce inter active programming that will allow the viewer to communi cate with the studio Viewers will be able to vote on programs or the performance of a politi Continued on page 90 This simple passive integrated circuit tester can be a valuable addition my on of 4 9 c 4 VAGQLYANS to your test equipment MARK HANSLIP A TESTER FOR INTEGRATED CIE cuits can be passive or active An active tester determines how a device reacts to a set of input signals It can determine if an IC is faulty but onlv if the device is remo
238. line ET a sete 124 335 Toronto Surplus amp Scientific 122 183 Visual Communications 84 95 Wavetek LOD coop mU 312 Weka Publishing 12 281 Xandi Electronics 112 Gernsback Publications Inc 500 B Bi County Blvd Farmingdale NY 11735 1 516 293 3000 Larry Steckler EHF CET President Christina Estrada assistant to the President For Advertising ONLY 516 293 3000 Fax 1 516 293 3115 Larry Steckler publisher Arline Fishman advertising director Denise Mullen advertising assistant Kelly Twist credit manager Subscriber Customer Service 1 800 288 0652 Order Entry for New Subscribers 1 800 999 7139 7 00 AM 6 00 PM M F MST ADVERTISING SALES OFFICES EAST SOUTHEAST Stanley Levitan Eastern Advertising 1 Overlook Ave Great Neck NY 11021 1 516 487 9357 Fax 1 516 487 8402 MIDWEST Texas Arkansas Okla Ralph Bergen Midwest Advertising One Northfield Plaza Suite 300 Northfield IL 60093 1214 1 708 446 1444 Fax 1 708 559 0562 PACIFIC COAST Blake Murphy Pacific Advertising Hutch Looney amp Associates Inc 6310 San Vicente Blvd Suite 360 Los Angeles C 90048 1 213 931 3444 Fax 1 213 931 7309 Electronic Shopper Joe Shere National Representative P O Box 169 Idyllwild CA 92549 1 909 659 9743 Fax 1 909 659 2469 L COMPUTER HOBBYISTS HANDBOOK BP251 8 95 Subjects covered i
239. lity of solid state components Today s complaints During the very early days of hi fi when was doing my after hours service work no one ever com plained to me about the high cost of repairs After all was the hi fi doc tor bringing my curative know how to their sick but cherished compo nents However once audio equip ment became a mass production commodity the audio repairman na y most of the suddenly had no more status than the TV repairman and might even have been the same person l ve written several times that the high cost of a repair compared to the original product price is an inev itable result of modern manufactur ing technology To put it simply Products are built by efficient com puterized automated assembly lines but they are repaired by the equivalent of 19th century hand la bor For that reason a skilled techni cian could easily put in 25 or more worth of labor to repair a 50 radic I ve always held that the manufac turer was the best source for mak ing repairs whether in warranty or not But l ve noticed that some ma jor hi fi manufacturers now refer you to outside service organizations for repairs on their products l m not sure whether this results from downsizing a desire to avoid the onus of repair problems or in some other way reflects the currently problem beset audio market but the existing fact of life is that many manufacturers don t seem to want to do
240. ll color pic tures which can be selected from the tape in the camcorder pho tographed live or adapted form any other video source The teleport equipped cam corder can send pictures via a stan dard phone connection to any other similarly equipped Viewcam At the receiving end the teleport can store up to 10 pictures in its solid state memory for later viewing either on the Viewcam s LCD screen or on a TV set The digital transmissions provide three grades of picture de pending on transmission time 8 11 or 20 seconds per picture At a recent demonstration the 20 sec ond version was undistinguishable from the original The teleport also includes an au dio visual telephone answering sys tem If the called party doesn t answer a recorded voice says Please transmit a video picture or Continued on page 90 The theft of vic 20 signals has cable TV and satellite TV programmers a egressively pursuing signal pirates gl PAUL PARADISE VIDEO SIGNAL THEFT IS NOT NEW its hardly sensational and it s rarely prosecuted However the cable TV industry by its own es timates loses billions of dollars each year because of it As the cable and satellite TV indus tries prepare for new interactive technologies they have become increasingly aggressive in try ing to thwart signal pirates Perhaps the most dramatic action by a signal pirate was the transmission of the following message that
241. lues of gain under open and closed loop conditions TABLE 1 TYPICAL ELECTRICAL CHARACTERISTICS OF THREE OP AMPS PARAMETER Input offset voltage Input offset current Input bias current Input resistance Large signal voltage gain Output voltage swing Common mode rejection ratio Supply current Siew rate Galn bandwidth product Supply voltage Power dissipation SYMBOL 1 nangamperes gain A is determined by the ratio of R1 to R2 and equals RY R2 This ratio also equals the output voltage divided by the input voltage This circuit s input impedance equals the val ue of R1 The circuit can easily be modified to give any desired gain and input impedance val ues by changing component values Current induced at the junc tion of R2 and RI is A times greater than that caused by the input signal alone Therefore the input acts as if it has an impedance of R2 A connected between the terminal and 2 5 08 mv 20 1 0 1 25 pA 80 1 2 50 pA 2x10 10x10 1x10 OQ 200 VimV 13 5 V 200 100K 2 14 DE a 100 dB 1 7 1 8 mA 0 5 15 4 16 2 volts per volt ground so it acts like a low im pedance virtual ground Figure 6 shows an op amp configured as a fixed gain non inverting AC amplifier Here the closed loop voltage gain equals R1 R2 R2 or the output volt age divided by the input voltage The input impedance ap proaches infinity An op amp can be made to
242. making it the most cost effective method for upgrading an existing stereo sys tem to full home theater performance on the market today Breakthrough The HTS 1 is able to decode the Dolby Surround signals in a Stereo videotape or laserdisc because the spatial and depth cues have been matrixed into the out of phase L minus R portion of the program By decoding passively the HTS 1 avoids costly and noisy signal pro cessing l lus you don t need any extra amps Just connect the HTS 1 to your existing stereo add two speakers for the rear and you ll experience the Easy installation Hooking up the HTS I is easy just connect the speaker outputs of your receiver or amp to the HTS 1 then connect speaker wire to the front and rear speakers The rear channel speakers don t have to be big We suggest the Chase ELF 1 in either black or white finish to match your decor Center Channel The Dialog pow ered center chan nel speaker is the perfect add on for home theater It keeps voices and sound effects cen tered on screen for stunning localiza tion and clarity Risk free home trial The best way to evaluate surround sound is in your home not in a showroom That s why we re offering this risk free home trial We re so sure that you ll be delighted with the quality of these products and the sur round sound experience that we are giving you 30 days to try them for yourself If they re not everything w
243. ment of 4 95 plus 4 95 shipping handling and applicable sales tax is enclosed Code of my Ec FREE book 3 Check or money order enclosed made payable to McGraw Hill Inc Please charge my VISA D MasterCard American Express D Discover Acct No Exp Date Signature required on all credit card orders Name Address Apt City State Zip A Phone Otfer valid for new members only subject to acceptance by EBC U S orders are Shipped 4th Claes Book Post Canada must remit in U S funds drawn on U S banks Cawadian orders are shipped International Book Post add 9 25 shipping handling Applicants outside the U S and Canada will receive special ordering instructions A shipping handling charge amp sales tax will be added to all orders RE195C MON S91u04I29 3 g66 Kuenuep 33 Electronics Now January 1995 ENERGIZER v CRYSTAL CONTROLLED 5 MINUTE AS SEMBLY MONEYBACK GUARANTEE At tach 3 wires and hear every whisper up to 2 miles away on any programmable scanner or VHF surveillance receiver Pre tested surface mount module uses standard 9V battery for 100mW output Includes battery box and crystal for 140MHZ Custom frequencies available for Law Enforcement Model VX 100 only 79 95 2 00 S amp H VISA MC MO COD add 5 00 DECO INDUSTRIES BOX 607 BEDFORD HILLS NY 10507 914 232 3878 CIRCLE 127 ON FREE INFORMATION CARD ENSEN Master Catalog 1994 1995 NEW La
244. n mind when buying a cellular phone It explains the different cate gories of cellular phones Mobile phones which are permanently installed in a vehicle consume three watts of power and are ideal for those people who must spend a lot of time in their cars Transportable phones have self contained bat teries so they can be moved from one vehicle to another They are a better choice for those who are likely to drive several dif ferent cars each day or must spend a lot of time away from their cars Portable lightweight handheld phones can be carried in a purse or brief case They are recom mended for those who are continually on the move who switch from private to public transportation or who must walk around a lot during the day The brochure outlines the six key points to investi gate when buying a cellular telephone talk time sound quality range comfort special features and price A glossary of cellular phone terms is also in cluded Security Systems for Your Home and Automobile by Gordon McComb Prompt Publications 2647 Water front Parkway East Drive Indianapolis IN 46214 2012 Phone 800 428 7267 or 317 298 5710 Fax 317 298 5604 16 95 This book explains how to save money by installing your own security system Modern security systems can deter property theft vandalism property bound ary violations and un wanted home intrusion They even warn of fire and smoke danger S
245. nclude microprocessors and their register sets interfacing serial paralley monitor games and MIDI ports numbering systems operating systems and computer graphics While the book is aimed at the computer hobbyist it should also prove useful to anyone who intends to use a computer to follow their interests Further Practical Electronics Calculations and Formulae FA W SON r i l l I I I I I I I I l Electronic L FURTHER PRACTICAL ELECTRONICS CALCULATIONS BP144 9 00 450 pages crammed full of all the formulae you are likely to need Covers Electricity Electrostatics Electromagnetism Complex Numbers Amplifiers Signal Generation and Processing Communications Statistics Reliability Audio Radio Systems Includes coverage on Listening to Short Wave Radio ITU Country Codes Worldwide Radio Stations European Long Wave and Medium Wave Stations Broadcasts in English and more LS im zot SUPPLEMENT TO ELECTRONICS NOW JANUARY 1995 Paperback Books GREAT PAPERBACKS AT SPECIAL PRICES INTERNATIONAL RADIO STATIONS GUIDE BP255 9 95 Provides the casual listener amateur radio DXer and the professional radio monitor with an essential reference work designed as a guide for the complex radio bands Internatinal Radio Stations Guide C WIRELESS amp ELECTRICAL CYCLOPEDIA
246. nctional Now you can generate any sinewave you need up to 10 megahertz on the fly 0 ymior Go ahead it s an old schematic OP AMPS continued from page 62 of about 50 megohms As stated earlier this limit is set by the leakage impedance caused by the mounting socket and or cir cuit board A conductive trace guard ring on the circuit board surrounding noninvert ing input pin 3 and tied to out put pin 6 will improve input impedance However if signifi cantly higher impedance is re quired substitute an FET input op amp such as the LF411 Audio mixer circuit It was stated earlier that the voltage gain of the basic invert ing amplifier circuit equals R1 R2 Consequently signal currents flowing in R1 and R2 are always equal but opposite in phase regardless of their indi vidual values The inverting amplifier cir cuit shown in Fig 5 canbe mod ified as shown in Fig 12 to be come a summing amplifier It has four identical resistor ca pacitor input networks in paral lel all connected to inverting input pin 2 The signal current flowing in feedback resistor R6 will equal the sum of the input signal cur rents flowing in resistors R1 through R4 The circuits out put signal voltage then becomes proportional to the sum of the signal voltages If the input and feedback re sistors have equal values 100 kilohms in this circuit the summing amplifier will provide unity voltage gain betwe
247. nd over again The most im portant rule in all high speed com puting is to avoid calculating what you can look up Any of several table lookup techniques can dramatically speed things up But these are hard to understand and are very device specific A PostScript example There are all kinds of variations on these vectorto step schemes It all depends on how fast you want to be and whether your microprocessor is capable of performing trigonometry rapidly In some cases such as computer animation the rendering speed is everything and you must use every machine language trick possible to make things happen quickly Elsewhere such as computer aided design a more leisurely pace is ac ceptable and a powerful and friend ly higher level language works just fine have found the general purpose PostScript computing language to be ideal for medium speed con versions especially for real time CAD CAM Figure 4 shows PostScript code that can do these conversions for you This is a very simple tutorial example that can be and has been significantly im proved With table lookup code speeds in the 13 000 steps per second range are easily reached Results can be recorded and then sent out later at arbitrarily high speeds The key point here is that you can now easily apply PostScript to ultra low cost homebrew hacker applica tions it is much better than any other way know of It is particularly good for such tricks
248. nd phone number as well as other personal information The starting point for the scrambling that will be used for interactive television is the en cryption already in use for dig itally transmitted signals Those transmitted signals are already in limited use by several programmers such as HBO Interactive television prom ises to be a revolution in televi sion viewing By any account it will be aboon to the cable indus try and generally to the elec tronics industry Reaping the full benefits of this technology will be no small feat Signal theft will be one of the major obsta cles Not only will a foolproof en cryption standard have to be developed but intra industry security must be carried out along with a uniform policy for marketing and distribution Q FOR SALE CABLE descramblers Bargain headquarters All major brands Absolutely the lowest prices Money back guarantee Nobody beats us RP ELECTRONICS 1 800 304 3604 BUYER S MART TUBES oldest latest Parts and schematics SASE for lists STEINMETZ 7519 Maplewood Ave RE Hammond IN 46324 TUBES new up to 90 off SASE KIRBY 298 West Carmel Drive Carmel IN 46032 CLASSIFIED AD ORDER FORM To run your own classified ad put one word on each of the lines below and send this form along with your check to Electronics Now Classified Ads 500 B Bi County Boulevard Farmingdale NY 11735 PLEASE INDICATE in which category of cl
249. nd suggests that anyone interested in such projects consult a patent attorney ELECTRONICS NOW ISSN 1067 9294 January 1995 Published monthly by Gernsback Publications Inc 500 B Bi County Boulevard Farmingdale NY 11735 Second Class Postage paid at Farmingdale NY and additional mailing offices Canada Post IPM Agreement No 334103 authorized at Mississauga Canada One year subscription rate U S A and possessions 19 97 Canada 27 79 includes G S T Canadian Goods and Services Tax Registration No R125166280 all other countries 28 97 All subscription orders payable in U S A funds only via international postal money order or check drawn on a U S A bank Single copies 3 50 1995 by Gernsback Publications Inc All rights reserved Printed in U S A POSTMASTER Please send address changes to ELECTRONICS NOW Subscription Dept Box 55115 Boulder CO 80321 5115 A stamped self address envelope must accompany all submitted manuscripts and or artwork or photographs if their return is desired should they be rejected We disclaim any responsibility for the loss or damage of manuscripts and or artwork or photographs while in our possession or otherwise circuit and a PC P or single board computer Ronald J Portugal Ud U0 lo 0 I 0 0 10 20 20 JANUARY 1995 PHANTOM OF THE ETHER The new energy saving fluorescent bulbs save money on electric bills but they can cause problems with
250. nerators CIRCUITS SECOND EDITION Other Low Cost 1 Projects 0404348 XX 49 50 Counts as 2 Hardcover eet gt e 4503P XX 36 95 Counts as 2 ELECTRONICS BOOK CLUB Blue Ridge Summit PA 17294 0810 for 495 only 4 values up to 181 70 PPR FEY amp Repairing i VCRS qs SECOND EDITION 3777H 32 95 Hardcover THE GIANT BOOK OF ELECTRONICS Gordon McComb dddlll 24 29 95 LT E m L o TUAR TENN frat 0487375P 24 95 YES Rush me the following titles billing me just 4 95 plus shipping handling amp sales tax Enroll me as a member of the Electronics Book Club according to the terms outlined in thls ad If not satisfied may return the books within 10 days for a full retund and my membership will be cancelled agree to purchase just 3 more selections at regular Club prices during the next 12 months and may resign anytime thereafter Code s of my books for 4 95 If you select a book that counts as 2 choices write the book number in one box and XX In the next if you select a Counts as 3 choice write the book number In one box and XXX in the next 2 boxes 3 Bill me FREE book not available with this payment option SPECIAL OFFER Prepay your order by check money order or credit card and receive a 6th book of your choice FREE O YES want the FREE BOOK indicated below My introductory pay
251. nger pages ype amp pictures more user triradly than ver before f A te k a ini Order Piione 800 326 1194 or 602 968 6231 24 Hour FAX 800 366 9662 or 602 138 1690 FREE CATALOG FEATURING THE BEST NEW PRODUCTS FROM MANY MAJOR MANUFACTURERS e Hand Tools Too Kits amp Cases Test Equipment Soldering Sup plies Wire Cable Connectors Bench Ac cessories Call 800 426 1194 FAX 800 366 9662 JENSEN TOOLS INC 7815 South 46th Street Phoenix AZ 85044 5399 CIRCLE 176 ON FREE INFORMATION CARD CALL NOW AND RESERVE YOUR SPACE e 6xrate 1 000 00 each insertion e Fast reader service cycle e Short lead time for the placement of ads e We typeset and layout the ad at no additional charge Call 516 293 3000 to reserve space Ask for Arline Fishman Limited number of pages available Mail materials to mini ADS ELECTRONICS NOW 500 B Bi County Blvd Farmingdale NY 11735 FAX 516 293 3115 Pea sN person or a computer process 2 A given environment might in clude one or more persons or pro cesses Processes might operate on one or more computers 1 A tool is what referred to easl ier as a function or a collection of functions A tool is designed and integrated within a conceptually uni fied architecture it is not just a ran dom collection of capabilities the WordPerfect model More generally the environment consists of everything perceiva ble presen
252. nics world awaits definitive word on the specifications for digital video discs TDK an Continued on page 34 TECHNOLOGY UPDATE How to get surround sound without buying the theater Chase Technologies brings you an amazing new patent pending surround sound decoder that turns 99 HOME THEATER SURROUND SOUND BREAKTHROJGH your stereo into a froe channel home theater By Charles Anton er to get that same surround sound in your home It takes more than five speakers to get surround sound there needs to be a way of separating the signals The new Chase Tech nologies HTS 1 de coder does just that and in a revolutionary way that rivals the best Dolby Pro Logic and THX systems Wins over critics In the September 94 issue of High Pert ormance Review noted audio critic Daniel Kumin said the HTS 1 can do quite a job of recreat ing a 3D theatrical ex perience surround effects emanated with satisfying fullness sound was clean at any level with quite involving and natur al sound ambience Plus John Sunier the leading authority on xL surround sound and producer of s much as love renting videos it s just A not the same as seeing a movie in a theater remember the first time I saw Jurassic Park I nearly jumped out of my seat when the dinosaurs roared One of the reasons movies seem so real is because surround sound makes it seem like you re actually there when events
253. nitive Tesla collection The publisher is now stocking a lot of the Lindsay Publications texts A well done catalog of architec tural Griffins and Gargoyles is newly available from Design Toscano For the fundamentals of digital in tegrated circuits check into my classic TTL Cookbook and my CMOS Cookbook texts More de tails appear in my nearby Synergetics ad also want to remind readers that reprints and preprints of all my col umns my free insider secrets cata logs and instant technical help is available on Genie PSRT A ten hour free trial is available per the Need Help box Free catalog requests and tech nical questions you want answered here or on PSRT can also be sent to me at my SYN ERGETICS GENIE GEIS COM In ternet address Q g doe raa d 29 95 pioneci diagtustie cube amp custom cube 154 95 39 95 CFT DPBB R 2 V 5 CFT DPBB R 2 V 5 CUBE MULTI FREQUENCY t0e s 108 5 97 5 154 95 NOTE ALL QUICK BOARDS ARE WIRELESS S A 8536 AUTO BOARD No swirCH S A 8535 AUTO BOARD No swiTCH S A 8570 8550 QUICK BOARD S A 8600 8590 8580 QUICK BOARD S A 8580 40 PIN PLUS MICRO S A 8570 90 8600 40 PIN MICRO NEW NEVER RESET Beet xt 29 95 TO COM 5507 MAPPER m TOCOM 5503 MAPPER 19 95 34 95 WAY MAL OR FORM Do US XN YOUR SELF A FAVOR DON T BOTHER CALLING US AND YES WE DO MEAN YOU 34 95 THESE PRODUCTS ARE FOR DIAGNOSTIC PURPOSES ONLY PERIOD 111 a i F zal ES
254. nnels or cable networks Some sporting events that are distributed by satellite are not available in certain blacked out areas For example Major League Baseball has ruled that out of town games should not be made available anyplace where the home team is in ac tion That means that an avid fan of the San Francisco Giants who lives in New York would not be able to view his favorite team if either the Yankees or Mets were in action The rules for NFL football prohibit a home game from being televised in the team s region if the stadium isn t sold out 72 hours prior to kickoff Such rules can be enforced by VideoCipher which has the ability to black out program ming according to ZIP codes However some TVRO system owners have been known to give incorrect address information when ordering program sub scriptions so that they could watch programming that would otherwise have been blacked out to them Commercial establishments such as sports bars that mas querade as residences have been another problem In this case an establishment at tempts to reduce its subscrip tion fees by registering for a residential instead of commer cial subscription Such satellite theft is difficult to trace Leads for enforcement come in through many avenues including rival sports bars that have legitimate program sub scriptions Agents who work for F uU A VCRS MODULE ready for insertion in a satellite TV receiver The smart card sl
255. now elec tronic technology is in such a state of rapid change that like the situa tion with Alice s Red Queen It takes al the running you can do to keep in the same place If you want to get somewhere else you must run at least twice as fast as that Although I ve hung up my Nike Airs can usually follow complex de scriptions of new technologies but please don t ask me to trou bleshoot the products Manufacturers warranties When first became involved in MON S21UOJI29 3 G66 Menuer Electronics Now January 1995 audio in the Fifties there were some strange ground rules embedded in manufacturers warranties It seems that the stores that sold hi fi prod ucts were not allowed to do in war ranty repairs on them For that there were factory authorized warranty stations which usually had contracts with several major companies and of course the fac tory itself wondered at the time how the warranty stations could stay in business given the very meager fixed labor rate paid for each repair It was explained to me that out of warranty repairs includ ing referrals from the manufac turers made the difference particularly since warranties usually were in force no longer than 90 days When transistor equipment ap peared many if not most elec tronic manufacturers optimistically extended their warranties to a year A bad mistake as it turned out The transistors blew up broke down and som
256. ns raster gray or vector step black input outputs closure error north south axis east west axis First you correct your input vector so it starts at your actual initial position This prevents closure errors from piling up If not already done you then resolve your input vector into its x and y components For a vector of length Z and an angle of 0 x 2Zcos 0 and y dZsin Next calculate the slope y x and save it for later use Then round x and y off to the nearest integer values to get the actual steps needed Compare the signs of x and y and the abolute sizes of x and y to find an octant X y X y octant 0 000 to 045 degrees x y x lt y octant 1 045 to 090 degrees X y X y octant 2 090 to 135 degrees x y xX gt y octant 3 135 to 180 degrees X y X y octant 4 180 to 215 degrees x y X y octant 5 215 to 270 degrees x y X y octant 6 270 to 315 degrees x y x y octant 7 315 to 360 degrees Ir you are in octant 0 you always step by x and sometimes step by y To determine whether a y step is needed multiply the total number of x steps so far by the slope If the current y total is more than 0 5 steps under this value also add a new y step Here are the rules for the other octants In octant 0 always step by x and sometimes step by y In octant 1 always step by y and sometimes step by x In octant 2 always step by y and sometimes
257. ns it off It then repeats that action for output 2 and so on After output 7 toggles the software then repeats the cycle Run and flash This is a vari ation of the sequencer applica tion It sequences the outputs for five cycles then flashes all eight three times and repeats the cycle Test The test application tests the controller The routine steps the outputs through all 32 power levels pausing one sec ond between each External Here s where things get interesting This rou tine allows an external source such as an intelligent I O mod ule or a computer to control power levels To get into this mode set switch S2 to a value of 2 install the correct jumpers then reset the circuit From then on input Port CO func tions as a strobe that causes the microcontroller to read the val ue on Port A and perform the proper function When rco goes low the micro controller reads Port A It then splits the value into a 5 bit power specification PAO PA4 and a 3 bit output port PAs5 PA7 The 5 bit power specification al lows 1 of 32 values the 3 bit output port allows 1 of 8 ports For example assume you place the value 57 on Port A and strobe pco low In binary 57 0101 0111 Taking the up per three bits yields 010 or 2 Taking the lower 5 bits yields 10111 or 23 Thus the controller will set output 2 to level 23 Summing up As you can see both hard ware and software are simple and sui
258. nsiderable invest ment in advanced technology Second the VCRS module has a provision to accept smart cards to update the encryption tech nology to counteract any hacks or security breaks The smart cards can be produced quickly and cheaply allowing any security breaks to be patched promptly Other Satellite piracy Despite the development of the VCRS that has virtually eliminated signal theft by home satellite TV viewers satellite theft remains a serious prob lem according to Dennis Powers Chief of Signal Securi ty Legal Department of HBO The main focus of our signal theft efforts is the commercial misapplication of our satellite signal said Powers We re not necessarily talking about boxes or modules that have been com promised or pirated but multi ple dwelling areas like trailer parks apartment complexes and recreational vehicle parks that have set up their own cable systems under the guise of being TVRO installations The pirate is paying a user fee but is bringing down our signal and then redistributing it through out the complex and charging a fee to each subscriber According to Powers the il legal user is acting as an illegal distributor or illegal franchisee by selling the programming to other users who may or may not realize that he is doing so without authorization Other forms of satellite theft include sports bars that pick up sporting events not usually available on broadcast cha
259. nt Ig The current flow ing into or out of either input terminal while the output voltage is near zero volts Input resistance Rw The ratio of a small change in the differential input voltage to a resulting change in the input current with the output remaining in its linear region Large signal voltage gain Ayo The ratio of the change in output voltage to the change in differential input voltage causing it Also known as open loop voltage gain Output voltage swing Vo The max imum output voltage available under specified loading conditions Common mode rejection ratio CMRR The ratio of the change in the input com mon mode voltage to the resulting change in input offset voltage created by it usually expressed in decibels Supply current ls The quiescent sup ply current required by the amplifier measured when the output is zero volts so that no current is delivered to the load Slew rate SR The ratio of the output voltage swing measured from the 10 to 9096 point of the leading or trailing edge to the time required for the output to traverse this level measured under large signal conditions Unity gain bandwidth BW The fre quency at which the open loop gain is zero dB Gain bandwidth product GBW The product of the available open loop gain at a specified frequency times that fre quency the op amps AC impedance A very high input impedance can be obtained from an AC volt age f
260. ntinental U S A 4 00 per order All others including AK HI PR or Canada must pay full shipping All orders delivered in CALIFORNIA must include local state sales lax Quantities Limited NO COD Prices subject to change without notice FAX for a FREE EL NI CORPORATION ade Aap P O Box 567 Outside the U S A send 2 00 postage Van Nuys CA 91408 FAX 818 781 2653 CIRCLE 107 ON FREE INFORMATION CARD ADVERTISING INDEX Electronics Now does not assume any responsibility for errors that may ap pear in the index below Free Information Number Page 212 Ace Communications 98 213 Alfa Electronics 116 Akizuki Denshi Tsusho Ltd 83 107 All Electronics ssess 94 Allen Engineering 102 Allison Technology 102 108 AME Salesi ece oe ais 79 I OAK Precision c uctor 17 217 BSS Sales ce coe oe 119 284 Basic Electrical Supply 114 291 Bel Vierit aac otii oom 108 220 Blue Earth Research 103 n AME II RET 102 CLAGGK Inc 12 89 Cleveland Institute of Elec 23 Command Productions 79 Comtrad Industries Pye 226 Consumertronics 105 58 Cook s Institute 8l 228 Cool Amp Conducto Lu
261. o the speakers Full dynamic range The speaker mounted in a bookshelf sized acoustically constructed cab inet provides a two way bass reflex design for individual bass boost control Full dynamic range is achieved by the use of a 2 tweeter and 4 woofer Plus automatic digital lock in AWARD WINNING WIRELESS SPEAKER Built in recetver Volume Power and amplifier Tuning The wireless speaker and headphones both contain a built in receiver and amplifier Signals are picked up and _ Sizer PH RCW x SSL speakers simply retum transmitted E penes 2 m is them within 30 days tor as far as 150 nne raiton in jonas ires i design a full No Questions through walls 10 watts channel RMS amps Asked refund E irn the u ei Recoton s Design and use OF ibDtres Tuned ports 2 tweeter 4 woofer Indmidual left right amp mono switch and Individual bass boost control on back Don t take our word for it Try it yourself We re so Sure you ll love the new award winning Recoton wireless speaker system that we offer you the Dare to Compare Speaker Challenge Compare Recoton s rich sound quality to that of any 200 wired speaker If you re not completely convinced that these wireless speakers offer the same outstanding sound quality as wired Engineering Award Breakthrough wireless speaker design blankets your home with music tuning guarantees optimum reception and eliminates drift
262. obotics OQ Computer Programming Q Programming in C i your staff was a significant factor in my swift completion of my micro Name EN Age computer repair training Their RP l helpfulness either by phone or by Address EN letter was nothing short of amazing J Preusker Angston SA Australia City 7 State Zip ooo o Js 7 Accredited Member National Home Study Council 10 0195 dJ M E E E M M NES ONES ONES ONES EE ONES EE NES ESO NES NES ONES mo G M O X MON S21001129 3 G66 Ki amp nuep Electronics Now January 1995 ON OFF E FSK INPUT FIG 3 PARTS PLACEMENT DIAGRAM You can make your own board or buy one from the source given in the Parts List The input output connectors are not mounted on the board I LELEEIDLI E RLEL ELA 2 copreigat svat wy LE M Tyee fa HAVEN CT ssl M Comp F NI FIG 4 AN EARLY PSG PROTOTYPE This board differs slightly in its parts layout from the final design that is the address of the first byte of N amp remember that N amp consists of four memory bytes PEEK returns the value of the data byte stored at the specified memory location So VARPTR N amp provides the ad dress of the first byte of N amp and PEEK reads the value of the byte at the address The J inside the PEEK function selects one of the four N amp bytes The AND logical operator cre ates the logical results of ANDing two quantiti
263. oll free What are you waiting for Isn t it time you joined one of the fastest growing professions around Isn t it time you earned a salary well above the national average Then now s the time to find out more about CIE Contact CIE today for more information Call us toll free at 1 800 243 6446 or call 216 781 9400 You may also fill out the attached postage paid card or the coupon below and drop it in the mail or fax it to CIE at 216 781 0331 We ll send you our FREE 40 page CIE home study course catalog with details on CIE courses and the CIE associate s degree Take Control Of Your Future Send me a FREE CIE course catalog and details on a CIE associate s degree zi Please Print Neatly Name City _ State Zip Phone Age I f I j 1 Address i i Ks 1776 East 17th Street Cleveland Ohio 44114 A School of Thousands A Class of One Since 1934 za Mmmm HH Ee D MON S21UO4J29 3 G66 Menuer Electronics Now January 1995 CIRCLE 26 ON FREE INFORMATION CARD power MOSFETs from Motorola is intended for high power applications The MOSFETs can safely dissipate 300 watts inter nally and control loads up to 5 kilowatts The TO 264 package formerly known as the TO 3PBL includes a large silicon die that measures 315 x 470 mils A single TO 264 MOSFET can elim inate the need for parallel ing multiple TO 247 power MOSFETs
264. ollower by configuring the circuit as shown in Fig 11 Re sistor R1 is bootstrapped from the op amp output through ca pacitor C2 Thus the imped ance of R1 is increased to the multimegohm range A 741 op amp circuit will typ ically have an input impedance Continued on page 66 A Isolation Transformer Build an isolation transformer to protect yourself and your equipment while you service electronics EVERYONE WHO REGULARLY SER vices television sets really should have an isolation trans former One side of the chassis of most line powered TV re ceivers and tube type radios is connected directly to the AC line Therefore servicing this electronic equipment can be very dangerous because the chassis can be hot An iscla tion transformer isolates the chassis of the equipment being serviced from the AC line This article explains how to build an isolation transformer for a frac tion of the price of a commercial product It will even supply more current than most com mercial units The heart of this project is the transformer The author ob tained the two transformers re quired from two discarded microwave ovens Buying a new transformer for this project will not save you much money over buying a commercial isolation transformer because the trans former required can cost more than 150 For example B amp K Precision sells an isolation transformer for 189 00 AI though electronics
265. ome appliances automobile electronics and outdoor equipment n ann Pinpoint and analyze problems quickly One Source For All Your Repair Needs e Successfully complete repairs with hands on troubleshooting instructions e Become skilled understanding flowcharts and schematic diagrams Better organized than a magazine more current than a book 900 page manual easy to follow detailed instructions trouble analysis flowcharts e Confidently use test equipment such as safety precaution checklists oscilloscopes frequency counters and d comprehensive replacement parts list video analyzers directory of manufacturer e Keep your equipment in top condition with effective preventive maintenance techniques Bs Repa ir xU nics Hep Continue to Broaden Your Electro Repair Expertise Manua You ll receive quarterly supplements up to ids pt iur 160 pages with new step by step repair and maintenance instructions valuable schematics and new repair techniques Learn how to repair a growing variety of appliances with hands on repair projects that will keep you up to date with later models and technology You ll be thrilled with your ability to repair a growing list of electronic equipment Supple ments may be returned or cancelled at any time iia Fi SAVE 10 Oe I LN SA d of x ME eS NA ON Ox e N oe e ey d Ae L z Ro e A ONE SPO Ne n Please rush me a copy of the new
266. omes in different grades and the cable quality will drastically affect the maximum safe lengths you can have Better quality cable costs a bit more per foot but it s less expensive and much less of a hassle than adding additional hardware to the network Use double shielded cable to get beyond the standard Novell length limitation This type of cable has a standard braided shield under the outer insulation and it also has the center conductor s insulation wrapped in foil This extra shielding really cuts down on noise and signal loss on the network l ve run this cable over 700 feet from a file serv er without any loss in performance Double shielded cable is a pain in the neck to use because it s difficult to remove the foil when installing connectors but it s an easy solution to your problem Be sure to use good quality connectors or you ll defeat the purpose of buying expen sive cable Q n1 GIA o bri Bal na iud r baa Fh Ep rr dbi ae REPORTS n oscilloscope is probably the most useful test instru ment that an electronics technician can have When the ce pabilities of a digital multimeter DMM are exhausted an os cilloscope takes over A DMM can indicate the presence of an AC or DC voltage but it doesn t allow the user to visualize the signal An os cilloscope is necessary for deter mining such things as the presence of an audio signal or whether the signal is being amplified Trou bleshooting
267. on Generator 0 02 Hz to 2 0 MHz OS 3344 Reg 899 649 00 Oscilloscope Probe Kit Pen Type DMM w Logic DMM w Holster Multifunction DMM DM5100 Switch Selectable X1 X10 i j a fes 79 59 00 keg 59 39 00 kes s89 59 00 a E M e 3 1 2 Digit Manual DM150 amp DM2500 DM3050 Auto Power Off 3 1 2 Digit Dual Display Auto amp Manual DCV ACV HP 9060 60MHz Reg 29 17 00 E Q HP 9150 Nes CMOS TTL Data Hold Rag 49 s DES HP 9250 ue Continuity Reg 59 3 20 Highpoint Dove Canyon CA 92679 10Hz 1 MHz 5 Ranges 0 30V0C a 0 16 VDC Sine Output 10Hz 1MHz 0 1 3A 0 1 10A Square Output 10Hz 100KHz Short amp Overload Protection Short amp Overload Protection 60MHz X1 X10 Probe Kit 2 sets 2 Dual Component Tester Comparator e 3 1 2 Digit 3 1 2 Digit 15 Big LCD 15 Big LCD OLD Us DK co B Heavy Duty e Freq Up to 20MHz AC DC V Q 20A AC DC A ph F Signal Capacitance Spa E pr 200p Injector Frequency Logic TTL a Diode TR hFE e TR hFE Diode Continuity Diode Continuity Beeper Continuity Double Insulated Jack B Holster BMC 800 532 3221 Digital Clamp On 40MHz Dual Trace DA400 Sweep Delayed 31209U Auto Data Hold 549 00 Reg 799 Ti 0 5 basic CUM Accu Zero Adjust Knob Multimeter Extended Range
268. ond to a voltage com mon to the two inputs com mon mode voltage Figure 10 illustrates some of the design options for a voltage follower with all of its negative feedback applied from output to inverting input pin 2 through resistor R2 Ideally resistor R1 which de termines the circuits input im pedance and R2 should have equal values Again in practical circuits the value of R2 can be any value up to 100 kilohms without significantly affecting circuit accuracy If the circuits op amp has a low frequency cutoff value like that of the 741 R2 can usually have a value of zero However op amps with high cutoff fre quency values tend to be unsta ble when operated in the unity gain mode Stability can be assured by in Stalling an R2 of 100 kilohms or by adding 1 kilohm plug in re sistor R3 in series The 0 470uF capacitor C2 across R2 reduces 9V GUARD RING SEE TEXT 2 C1 6 en 0 470 a n U E o OUT a N P R1 R3 100K 22K JJ e N P NONPOLARIZED FIG 11 AC VOLTAGE FOLLOWER with a 50 megohm input impedance R6 100K 10 v Ci R1 0 220 100K 2 C2 R2 3 30 r wd Ene oe 9V OUTPUT 40 CA R4 R5 0 221 100K 100K LJ LJ FIG 12 SUMMING AMPLIFIER as a four input audio mixer GLOSSARY OF TERMS Input offset voltage Vio The differen tial input voltage required to produce zero output voltage Input offset current lo The difference between the two input currents Input bias curre
269. or uild This Canivan C Sep 65 Light to Frequency Converters Lancaster HH Oct 75 Line Grabber Telephone lannini C Sep 43 Linear to Log Converter QA Jun 10 LET Sep 16 Logic Scope Probe ITT Pomona ER Feb 20 Long Range Body Heat Detector lannini C Feb 38 Lost Art of Regeneration The Kitchin C Mar 66 LET Jun 14 Lotus Smart Suite Holtzman CC Mar 91 Low Cost Colorlmeter Schnable Alessandro amp Orr C May 45 Low Distortion Sinewaves Lancaster HH Jan 80 Magic Cap General Magic s Holtzman CC May 90 MCA to ISA Adapter QA Jul 10 Memory Confusion QA Apr 10 Micro Lights Retzinger C Dec 39 MicroConductor The Tarchinski C Sep 49 Microcontroller Programmer 68705 Beard C Jan 43 PIC Eady Jan 35 Feb 48 Microsoft Office Holtzman CC Mar 91 Office Pro Holtzman CC Mar 91 Minute Marker Palmer C Sep 73 Modem Communications Standards Bigelow Sep 35 Monitor Radon Neher C Jan 56 Feb 66 Morse Code Tutor Tarchinski Sep 69 Motor Speed Controller QA May 10 Multimedia Resources Lancaster HH Jan 80 Multimeters Hewlett Packard HP 970 Series ER Dec 18 National Electronics Technicians Day Apr 77 National Information Infrastructure The Holtzman CC Feb 38 New Age of Sateliite TV The Fenton Apr 33 New Life for Oid Scopes Covington Sep 57 NEW LITERATURE D Jan 24 Feb 26 Mar 32 Apr 26 May 26 Jun 24 Jul 26 Aug 22 Sep 30 Oct 26 Nov 22 Dec 24 NEW PRODUCTS D Jan 20 Fe
270. ore than 11 years He served two terms each as chairman of ISCET and was president of the California State Electronics Association An ISCET test administrator for many years he made the ISCET Serviceability program prominent nationally Official nomination forms for the Hall of Fame are available from the Electronics Industry Hall of Fame Inc 500 B Bi County Blvd Farm ingdale NY 11735 0 Li i nmn q hu 4 M bal hla MODEL 391 390 389 388A a sans o5 et oi hoe acc Wear WOLD j 7 is END re me cv aeset MEM 73 Es 3 Ar E Meetthe new TEST BENCH a DMMs with more of what habec i ay un car ox d ji MES E theoriginal abest seller tei 16 7 m B K PRECISION s original TEST BENCH T a E testers became overnight best sellers y C CAPACITANCE ael EE because they fused the power of many Ze i ixi In ay Poen te These ie d new models also out feature ordinary 7 DMMs and outperform them as well toil 1 Allure ruggedized offer longbattery TA life and carry a three year warranty dE s age ua n Y van T Tes ATI A HOGICLEVEL With True RMS 42 digit 20 000 counts and 0 05 DCV accuracy i the Model 391 is a BEST BUY La 2 aaa oF TEMPERATURE d Now youcan have very high acturacy f extra resolution and True RMS readingat FUGGE DIZED ff A Cm Fii c verya ordab e price The Model 391 L DM RUBBER BO
271. ore pop cvi incs exch store 0 O 1 incs 1 sub posn exch def E print curxpos curxpos 1 add store posn 1 add slope mul 0 5 sub 1 index ge 1 add N print curypos curypos 1 add store if for pop def oct1 exch 2 copy exch div slope exch store pop cvi incs exch store 0 0 1 incs 1 sub posn exch def N print curypos curypos 1 add store posn 1 add slope mu 0 5 sub 1 index ge 1 add E print curxpos curxpos 1 add store if for pop def foct2 exch 2 copy exch div neg slope exch store pop cvi incs exch store 0 0 1 incs 1 sub posn exch def N print curypos curypos 1 add store posn 1 add slope mu 0 5 sub 1 index ge 1 add W print curxpos curxpos 1 sub store if for pop def loct3 2 copy exch div neg slope exch store pop cvi abs incs exch store 0 0 1 incs 1 sub Uposn exch def W print curxpos curxpos 1 sub store posn 1 add slope mut 0 5 sub 1 index ge 1 add N print curypos curypos 1 add store if for pop def loct4 2 copy exch div slope exch store pop cvi abs incs exch store 0 0 1 incs 1 Sub Uposn exch def W print curxpos curxpos 1 sub store posn 1 add slope mul 0 5 sub 1 index ge 1 add S print curypos curypos 1 sub store if for pop def loct5 2 copy div slope exch store cvi abs incs exch store pop 0 O 1 incs 1 sub posn exch def S print curypos curypos 1 sub store posn 1 add slope mul 0 5 sub 1 index ge 1 add W print curxpos curxpos 1 sub store if for pop def oct6 2 copy div neg
272. oshiba son 27C 7256 with 256 KB ot GOLD 4 700 per kt with 256 KB SRAM SRAM 61 800 per k cluding technical lt SILVER gt Y4 000 per kit wth 64 KB SRAM Documentation dedicated board ana utility ncludes technical documentation aedicated software 3 5 2HOI board and utilty software 3 5 2HD Ultra Bright Welcon 28P ZIF Alps Mechanical Jumbo LED 3 Sockets ae Encoder a r e when BU986 AR lanes i oan amp Son 20m ia en IEND de amp Io Ail ot tne above come with instr cuon manual Japanese Add 10926 of the total purchase for shipping and handling charges Akizuk Denshi Co Ltd is proud of its high level of reliabilty and outstanding track record in the production and sales of electronic componen s ana electronic measur ing instruments in Japan for more than 50 years Although we are currently engaged in the selling of products to your Country on an individual basis our objective 1s to eventually supply products in large volume wholesale Conversely we would also like to purchase and import electronic components and various measunng instru menis from the U S for sale in Japan We are particularly interested in merchandise in stock as well as Products no longer required below for further details We would be happy to consult wih your firm conceming tuture business transactions Please stop by for a vist om your next tno t0 A nabara nQunes and orders may C2 sent to the facsimile number indicated
273. osite in fact The parts are only comprehensible within the context of the whole Context is what poor interface de signers usually fail to grasp Context is what good interaction designers grasp implicitly In real estate it s location location location Where the user interface is concerned it s context context context Context is dynamic Explanations of Gestalt theory frequently depend on static meta phors An oft cited example is that of identifying a structure presented in a skyline The associationists would have us believe that the sky line is the sum of the perceptions of the individual structures By con trast Gestalt holds that the individ ual structures are identifiable only insofar as they are elements of that Skyline Likewise technologists tend to view the world as a collection of function boxes input process out put The user clicks a mouse but ton the computer does some processing then presents some new output Input process output User computer screen By con trast a Gestalt view would see one thing the interaction process as a dynamic context in which inputs processing and outputs occur There are thus two primary yet diametrically opposed points of view concerning human computer interaction functional and process oriented The functional view has prevailed throughout the entire his tory of computing it is only in the last few years with the rise of the field called usabili
274. ot to the touch Do not use the isolation transformer to power anything with that high a power rating for extended peri ods of time Most modern TVs even those with large screens consume 350 watts or less 0 SINEWAVE GENERATOR continued from page 52 Construction A circuit board with a ground plane is required for building this project because of the high frequencies involved You can make your own board or buy one from the source given in the Parts List Figure 3 is the parts placement diagram The NCO and DAC ICs are expensive and can be damaged if they must be removed so it is recommended that you install them in low pro file machined contact sockets Do not mount the input out put connectors on the PC board BNC connectors are rec ommended for the FSK input and sinewave output Attach a grounding lug to the BNC con nectors and then solder it to the ground plane of the board to provide mechanical support for the connectors Wire the power source directly to the board or wire a suitable power jack to the board Cut a four foot length of five conductor cable for the PC ca ble Solder one end of the cable leads to a male DB 25 con nector as shown in Fig 3 and the other end directly to the PC board Figure 4 shows the com plete board After carefully inspecting the board for incorrectly installed components and poorly sol dered joints and making any necessary repairs the gener ator is fu
275. ot provides for upgradable security the major leagues or private in vestigators visit sports bars throughout the country to monitor what is being shown Late last year NFL Enterprises Inc filed civil suits against doz ens of bars across the country for buying residential subscrip tions to its NFL Sunday Ticket package Residential subscrip tions cost 139 for the football season while commercial es tablishments pay from 600 to 2000 depending on their size To catch suspected signal pi rates NFL enterprises sent out teams of investigators to sports bars During stops in play the league caused all VideoCipher modules to display their identi fication numbers on the TV screen So that its investigators could note them and compare them against its subscription database Yet another form of satellite signal theft occurs overseas The Motion Picture Association of America MPAA has repeat edly cited the Caribbean area as a hotbed of piracy both for pi rated videocassettes and signal theft However the MPAA does not authorize cable program mers to distribute their services outside the U S If people in the Caribbean countries want cable services they have no choice but to engage in signal theft Technically the footprint of the satellite signal is there said Matthew Sappern man ager of corporate affairs for HBO HBO doesn t have the right to legally distribute and market its services outside the
276. out puts a pulse that controls the 4040 s RESET pin As you can see in Fig 3 the two hertz clock signal is delayed by a half monostable circuit made up of a 4081 AND gate IC19 b and this delayed signal triggers the 40405 RESET pin The RC values in the half monostable circuit ensure that the 4040 won t be reset unt the correct count is available at the output of the spark counter Q Never before has so much professional information on the art of detecting and eliminating electronic snooping devices and how to defend against experienced information thieves been placed in one VHS video If you area Fortune 500 CEO an executive n any hi tech industry or a novice seeking entry into an honorable rewarding field of work in countersurveillance you must view this video presentation again and again Wake up You may be the victim of stolen words precious ideas that would have made you very wealthy Yes profes sionals even rank amateurs may be lis tening to your most private con versations Wake up If you are not the victim chen you are surrounded by countless vic cims who need your help if you know how to discover telephone taps locate bugs or sweep a room clean There is a thriving professional service steeped in high tech techniques chat you can become a part of But first you must know and understand Countersurveilance Technology Your very first insight into this highly rewarding f
277. oven s magne tron The magnetron is the vac uum tube that produces the microwave energy for the oven The filament winding is easily identified it consists of three to five single turns of 12 or 13 gauge enamel covered wire This winding is usually wound directly over the 120 volt AC winding which is wound from FIG 1 ISOLATION TRANSFORMER SCHEMATIC Switch S2 allows power to the transformer to be turned off while the fan continues to cool the transformer MON S21U04129 3 g661 Menuer Electronics Now January 1995 approximately the same size wire as the filament but it has more turns The high voltage winding which will be dis carded for this project consists of many turns of much smaller gauge wire The microwave ovens fan or blower that cools the magne tron is also needed for this proj ect The transformer will run warm under load and the oven fan is an economical way to keep it cool None of the other parts see the Parts List while commonly available will be found in a microwave oven Modifying the transformer Locate two surplus or dis carded microwave ovens that are identical or as similar as possible As stated earlier the transformers from two ovens are needed to build the isolation transformer These transfor mers usually remain in good working condition As an alter native two surplus transfor mers might be easier for you to obtain than two scrap micro wave ovens The pencil in
278. owing club SELECTED EXCELLENT COND 849 00 VERY GOOD CONDITION 695 00 These instruments are fully checked out and calibrated They are supplied with an original front panel cover and complete service manual Original TEK Probes are 75 00 each with each purchase MARCONI SYNTHESIZED SIGNAL GENERATOR Model 2018 Freq range 80Khz 520Mhz with calibrated out put levels from 127 dBm to 13dBm Resolu tion 10Hz It can be freq phase or amplitude modulated from ext or int modulation sources RF output resolution is 0 1dB reversepower protection of up to 50W is possible without damage to the instrument This instrument is microprocessor controlled and very easy touse a must for any serious repair or development lab Price 1750 00 Checked HP 8565A SPECTRUM ANALYZER 01 40GHz 6250 00 HP 8558A SPECTRUM ANALYZER 01 1 5GHz 2750 00 HP 8559A SPEC ANALYZER 01 22GHnz 4995 00 HP 8160A OPT 20 PROG PULSE GEN 3995 00 HP 4260A LCR BRIDGE cete ect nnne ettet 385 00 HP 3551A TRANSMISSION TEST SET 950 00 EXACT 566 SWEEP FUNCTION GEN 345 00 BOONTON 82AD AM FM MOD METER 1275 00 TEKTRONIX 7L13SPEC ANALYZER 1KHz 1 8GHz 3250 60 TEKTRONIX 7L12 SPEC ANALYZER 100KHz 1 5GHz 2700 00 TEKTRONIX DA 4084 PROG DIST ANALYZER w TM5003 MAINFRA ME
279. ows R 1004 GRC 109 Receiver T 784 GRC 109 Transmitter PP 2684 GRC 109 Power supply AC DC PP 2685 GRC 109 Power supply AC only CN 590 GRC 109 Voltage regulator For hand crank generator Plus Headset Accessory kit with new spare tubes and parts original manual and cables These are new in the box A FABULOUS collector item Price iae 00 Completes sets eus MILITARY STANDARD D C GENERATOR Superior QUALITY plus rugged design are fea tures of this deluxe 2 cylinder 4 stroke gasoline generator The control panel contains meters for voltage amp current indication main circuit breaker and voltage adjustment Shielded wires and plugs comprise the RFI suppression ignition system eliminating most radio noise These units are new in the original carton complete with opera tors manual and only require fuel and oil for Operation output voltage is adjustable approx 10 32v 28v nom 53 3A 1 5Kw continuous duty load Price 295 00 New in Orig Carton You will be impres Weight 121 Ibs Dim L 27 xH 18 xW 20 N STATIC FREQUENCY CONVERTER Finally a simple way to powerupall that 400 cycle stuff This is a completely self contained solid state converter that just plugs in to any 115vac 60 Hz power source and provides easy instant 400Hz single phase 115vac output 9500 watts Price 395 00 ea New in Original Carton DimzL21 xW I2 xH15 Wcight 99lhs PAED e 008 wh m a e Q c c d
280. parts assemblies available LAGUNI Plans oun ess sssssssssssscsenssarssensevenscee 20 00 LAGUNIK Kit Plans Price on Request Extended Play QO Telephone RecordingSystem READY TO USE Automaticalfy controls and records on our X 4 extended play recorder taping both sides of a telephone conversation Intended for order entry verification Check your local laws as some states may require an alerting beeper TAP20X Ready to Use System 129 50 pA e Shocker Force Field A Vehicle Electrifier Neat little device allows you to make hand and shock balls shock wands and electrity objects charge capacitors Great payback for those wise guys who have wronged you SHK1KM Easy to Assemble Electronic Kit n 124 50 Blaster Pulser Pocket sized wand produces 100 000 watts of power for personal defense field and lab use etc BLS3 Plans 10 00 BLS3K Kit Plans ABO Homing Tracking Transmitter Beeper device 3 mile range HOD1 Plans 10 00 Listen Through Walls Floors Highly sensitive stethoscope mike STETH1 Plans 8 00 STETHIK KitPlans 44 50 s209000090000 44 00 HODIK Kit Plans 49 50 TELBGRABIK Kit FRING 1 tn Electronic and Scientific Products NEW INFINITY TRANSMITTER Room Monitor Phone Line Gabber ALL NEW The Ultimate in Home or Office Security amp Safety Simple to Us
281. piezo ignition CAUTION REQUIRED POTI Plans tech party prank 10G3 Plans ccscsscesssseeccsssseesenseeeees 8 00 IOG3K KiPlans s 69 50 Invisible Pain Field Generator 9 1 FireBall Gun Shoots flaming ball two shot capacity Great for special effects and remote fire Starting CAUTION REQUIRED FIREBALL Plans Dangerous Product 10 00 Q amp V Dept ENS17 Box 716 Amherst NH 03031 Phone 603 673 4730 FAX 603 672 5406 MC VISA COD Checks accepted Piease add 5 00 Shipping amp Handling Dangerous Product ed 10 00 3 eo TV amp FM Joker Jammer Shirt pocket device allows you to totally control and remotely disrupt TV or radio reception Great gag to play on family or frends Discretion required EJKIKM Easy to Assemble Electronic Kit ATTENTION High Voltage Fans 4 000 volts in the palm of your hand Experiment with anit gravity hovercraft ion guns force fields plasma guns shock devices wireless energy and electrical pyrotechnics Input 9 14VDC MINIMAX4 Ready to Use s 24 50 Laser Bounce Listener System Allows you to hear sounds from an area via a lite beam reflected from a window or other similar objects System uses our ready to use LATR1 Laser Terminator gun site as the transmitter The receiver section is supplied as an easy to build kit ey our cushioned HS10 headsets LLIST2 Plans
282. plays PC 3030 0 30V 0 3Ax2 PC 3030D Digital display 5 509 95 Programmable DC Power Supplies High stability low drift 4 digit displa Front rear output sense switch selectable Auto ste w timer settings 100 point programmability PPS series 50 p programmability PPT senes a o serial and parallel operation PPT series Au n Auto tracking PPT series IEEE 488 2 and SCPI compatible command set optional PPS 1860G 0 18V 0 6A 999 95 PPS 3635G 0 36V 0 3 5A sss 999 95 PPS 6020G 0 60V 0 2A seg 999 95 PPT 1830G 0 18V 0 3AX2 0 6V 0 5A 299 95 PPT 3615G 0 36V 0 1 5Ax2 0 6V 0 3 1299 95 FAX 609 520 2007 CIRCLE 213 ON FREE INFORMATION CARD DM 8034 3 digits Digital Display Function Generator FG 8016G 239 95 Frequency Range 0 02Hz to 2MHz Three Instruments in one Function generator Pulse enerator amp Frequency counter Sine Triangle Square TTL Pulse and CMOS output Built in 6 digit counter with INT EXT function 1000 1 tuning range Vanable DC offset control FG 8015 Function Generator 0 02Hz 2MHz No Counter 189 95 FC 8131 Intelligent Counter 1 3GHz 5469 95 FC 8270 Intelligent Counter 2 7GHz 599 95 UC 201 0G Universal Counter n ores cc oed P8 99 OF Digital Multimeter amp C Meter 179 95
283. position The desired y position is obtained by multiplying x times the slope Whenever you end urs TROP eran ei dad Bor Tr eae one ips i i B D an ou Zur WE oe E aa ign Fr A CAL in pia IUD E j 5 ZI ELS LEM Ph 1 2 CTO CAT RE RIE Sear rE T A33 T Y FIG 3 SOME CAD CAM SYSTEMS can apply xand y stepper phase by interleav ing techniques to improve their appar ent resolution dramatically SURVEILLANCE amp SECURITY FM TRANSMITTERS MINI KITS a VOLT FM XMTR up to 300 ft indoors 1500 ft outdoors PHONE XMTR range to 500 ft uses phone line power Sound Activated XMTR range to 500 ft 2 STAGE XMTR 9 Vott very powerful All above require simple soldering at 2 to 4 places TELE CALL FORWARDER Transfers incoming calls 99 00 CALLER ID Registers incoming number 99 00 TEL REGISTER WITH PRINTER Records dialed number duration and prints record 169 00 TEL REGISTER W O PRINTER Records dialed number amp time 16 digit display 99 00 12 HOUR LONG PLAY RECORDER Modified Panasonic Records 6 hrs on each side of 120 tape supplied Compatible with VOX and Tel Rec Adapter 119 00 VOX VOICE ACTIVATED SWITCH Makes re corder self activating with voices or other sounds 28 50 TELE RECORDING ADAPTER Records incoming and outgoing calls 28 50 TELEPHONE SCRAMBLERS Over 4 000 separate codes 199 00 VOICE CHANGER Changes man s
284. prototype unit Test fit the fan and the transformer before dril ling any holes in the case The fan should be mounted so that its air stream is directed at the transformer Once the correct positions are determined for the BASE fan and transformer mark the locations and drill the mount ing holes but don t mount any thing yet If you purchase the case spec ified in the Parts List you will find that many of the necessary holes are already punched out Otherwise prepare the en closure by drilling a hole and mounting the line cord to the 120VAC COILS LPS S i uo T Vado J n nh x FIG 4 SOME TRANSFORMERS have spacers between their coils and the core TERMINAL FIG 5 POINT TO POINT WIRING is used throughout this project BLOCK US ue PARTS LIST T1 Modified microwave oven transformer see text Fi 5 ampere fuse and panel mount fuse holder S1 S2 SPST 15 ampere toggle Switch NE1 NE3 120 volt AC neon in dicator lamp SO1 Standard duplex AC recep tacle Metal case Mendieson Elec tronics 1 800 344 4465 Part No 160 1782F or other suitable en closure grounded AC line cord cooling fan from old microwave oven see text 14 to 16 gauge wire terminal blocks solderless connectors wire ties hardware back of the enclosure Prepare the front of the enclosure by drilling holes to mount the neon indicators NE1 NE2 and NE3 Then drill holes for swit
285. ption turned out to be faulty I then guessed that the interference had something to do with the way the elec ronically ballasted lamp worked Compact fluorescent tubes operate at high frequencies explained Arnold Buddenbery a researcher at the Lighting Re search Center of Rensselaer Polytechnic Institute in Troy NY He said those high frequen cies modulate the tubes in frared output and cause inter ference for remote controls based on infrared emission The heavy magnetic ballast associated with standard fluo rescent tubes limits the flow of 60 hertz current through the tube That ballast produces a flicker that can be annoying in rooms lit by the older fluores cent lights Their flicker rate is 120 hertz twice that of line power LIGHT SPECTRUM IN NANOMETERS INFRARED INFRARED REMOTE fu m md ee AMPLITUDE SHOWS RELATIVE POWER ELECTROMAGNETIC SPECTRUM IN KILOHERTZ 200 400 600 ULTRAVIOLET TYPICAL FLUORESCENT LAMP TYPICAL INCANDESCENT LIGHT 1 0 1o 10 10 10 10 AM TV p I FM LONG WAVES SHORT WAVES MICROWAVES The operating frequency of electronically ballasted fluores cent lights is between 25 and 50 kilohertz They produce a 50 to 100 kilohertz flicker which is too fast for human eyes to sense However it is this non visible flicker in the form of a switched infrared signal that interferes with infrared remote controls The remote controls for switching cab
286. que system that highly y piracy while permitting legit archival Coples No known way to defeat No speciai equipment required Simple and automatic to Install on your distributed software Compatible with all other Copy prevention systems Manual DIsk 59 STEALTH TEGHNOLOGY Police raoar is fascinating it aiso has error rates of 10 20 I Every known error mode Stealth method and ma terial used to minimize radar reflections tactic and strategy to fight unjust radar tickets H cost you 1005 in Insurance and risk cancellation methods to detect and lam Signals fully described 29 SECRET amp SURVIVAL RADIO Optimum Survival and security radio equipment meth ods freq allocations and voice data scrambling ncod ing Includes small recelverstransmitters telemetry an tenna optimizations remole monitoring and Control Se curity surveillance and ultrasonic fiber optic and infra red Commo 70 circuit plans tables 29 LTIMATE SUCCESS MANUAL Underpald Harassed or abuse Manipulated Taken for granted Stuck in a dead end job Can t find a e ob Expect to be lald off fired or transferred Soon he ultimate no holds barred looking after 1 Machia vellian techniques to find obtain optimize and keep top lobs py and benefits THE RULES OF THE GAME FO A GAME WITHOUT RULES From resum to CEO 29 ROCKET S RED GLARE d build solid propenant amateur and Survival rockets Emphasis on formulation manufa
287. r VCR Repair VCR 3 Minor VCR Repair Il VCR 4 Common VCR Malfunctions VCR 5 Diagnosing Video Heads and Cam 1 Minor Camcorder Repair Net weight 5 Ibs EN 505 550 BUY THE SET AND 195 EACH CALL TOLL FREE 800 338 0531 CIRCLE 262 ON FREE INFORMATION CARD These special bits are used to remove the star shaped security screws found on many Japanese made video games and other consumer products The 3 8mm bit works on Nintendo NES Super NES and Gameboy cartridges The 4 5mm bit works on NEC Turbo Grafx Sega eere or Nintendo erfect for cleaning g contacts replacing batteries and installing rental security tabs EN 360 215 3 8mm EN 360 216 4 5mm EN 390 590 72 Pin Game Cartridge Connector Quality replace ment for the game cartridge connector used in Nintendo Entertainment Systems NES Repeated loading and removal of game car tridges damages the connector con tacts and produces symptoms such as a flashing blank screen or dis torted picture Revitalize your unit by replacing the game connector It s simple there is no soldering required and only a phillips head screwdriver is needed to complete installation in minutes Our replacement connector has gold plated game contacts for long life superior conductivity and resistance to oxidation One year warranty 95 EN 091 900 895 7 oup 50 9 o Digital Caliper High precision cal
288. rammer Brown C May 39 Pseudoscience Journal Lancaster HH Feb 73 Pulse Counter QA Jan 10 Q amp A D Jan 10 Feb 10 Apr 1C May 10 Jun 10 Jul 1 Sep 8 Oct Question of Power A Klein AUD Jan 87 R RADIO Lost Art of Regeneration The Kitchin C Restore it Right McClellan Vintage Radio Mar 66 LET Jun 14 Aug 69 LET Nov Knight Jan 63 LET Apr 12 LET Jun 14 Radon Monitor Neher C Jan 56 Feb 66 LET Jul 1 RBDS FM Data Decoders Lancaster HH Mar 81 Services Lancaster HH May 75 RCA DSS Digital Satellite System Fenton Apr 33 Receiving Weather Satellite Images Brandli Aug 53 Regeneration the Lost Art of Kitchin C Mar 66 LET Jun 14 Regulator Switch QA Jui 10 Relay Output Circuits Marston Jul 4 Relays All About Marston Jun 69 Reprints and Standards Lancaster HH Nov 71 Resistor Cube Solving the Muntz C Dec 45 Restore it Right McClellan Aug 69 LET Nov amp Retro Remote Build the Templin C Dec 31 S Santa Claus Machine Update Lancaster HH Jul 71 Satellite TV The New Age of Fenton Apr 33 Scientific Method Review Lancaster HH Nov 71 Screamer Circuit The Spies C Apr 75 SCSI Communication Fundamentals Lancaster HH Apr 85 Second Law Violations Lancaster HH Jul 71 Semiconductor Testing Environmental Byers Nov 55 SETI Developments Lancaster HH Oct 75 Shaft Encoders Stepper Motors as Heckt C Feb 53 Shaft Encoder Designs Lancaster
289. rates has led to some inter esting arti piracy devices in cluding the electronic bullet In April 1991 for example American Cablevision of Queens New York filed suit against 317 cable customers who were pirating signals Jerrold Communications a division of General Instrument Corp learned that its convert ers were being compromised by an override chip The black mar ket chips were installed in a basic converter to obtain free premium programming After obtaining several pirate de vices Jerrold engineers devised a strategy for outwitting the chip The engineers invented a bullet that used the chipsown programs to neutralize it The bullet is designed to blow out a box that has been tampered with Hack ex plained Our computers talk directly to the decoders that we purchase from the manufac turer and tell it what to author ize To use the bullet we senda signal down the line that says ignore the next message and the legitimate boxes will ignore the next message the next MON S21u04129 3 GEE Menuer Electronics Now January 1995 message being blow yourself up There is no frying or elec trical charge or bullet just a deauthorization Incredibly the bullet succeeded because irate homeowners with pirated boxes unaware that a bullet had been fired called the cable company to complain about the lack of reception Despite the penalties afforded under the Cable Acts of 1984 and
290. recise positive a The full user s manuals larger and must be printed COPPER CLAD PC BOARDS One oz copper phenolic base DIGITAL CAPACITANCE INDUCTANCE METER DIGITAL LCR METER measures inductance ca pacitance and resistance At Last An LCR meter that everyone can afford Now you can measure coils transformers chokes from 1H to 200H Ca pacitors from t ptd to 200 mtd and resistors from 1 ohms to 20 meg ohms All in one handheld instru ment MODEL LCR 1801 119 95 MAGNET WIRE Enarnel coated solid capper For winding coils transformers and toroids Prices for 1 4 b spools 2 Ry CABLETV UNIVERSAL PRODUCT New Technology MODEL 5000 Fully Assembled 199 95 Our fully assembled product is factory tested and GUARANTEED to work on your system We will also include an AC power adaptor and complete hookup instructions This unique product will be available for a limited time only 4000And 5000 Features Thelatest in Video Amplification Technology New clocking circuits to stabilize color and the picture performance The most advanced picture locking circuitry Inverted Video Option is available Connects easily to your VCR e NO CONVERTER BOX is necessary Call The Halcyon Group NO Florida Sales 44g Connects to standard git PC parallel printer port
291. ree Program is available in either of two options 1 The B S E T with Major Em phasis in Electronics OR 2 The B S E T with Major Em phasis in Computers Our Computer Science B S Degree Program leads to the B S C S the Bachelor of Science in Computer Science An important part of being pre pared to move up is holding the right college degree and the absolutely neces sary part is knowing your field Grantham can help you both ways to learn more and to earn your degree in the process Write or phone for our free catalog Toll free 1 800 955 2527 or see mailing address below Accredited by the Accrediting Commission of the Distance Education and Training Council e GRANTHAM College of Engineering Grantham College Road Slidell LA 70460 COPE at the DOS prompt fol lowed by a port address if other than LPT1 is used The cursor keys control most of the oscilloscope functions The up and down cursors move a function indicator to different menu selec tions and a selection is changed with the left and right cursors Other commands are activated by key strokes The A key selects AC cou pling C toggles connecting lines between samples D selects DC coupling F toggles between sweep and spectrum X toggles between X1 X 2 and X 5 sweep expansion the Space bar freezes the display until the next keystroke P cycles through special DSP processing to expand the sweep by X 2 X4 x8 and X16 L toggle
292. remote controls Tom Heald OPERATIONAL AMPLIFIERS Learn how to design op amp circuits Ray Marston VibEo News What s new in this fast cnanging field David Lachenbruch EQUIPMENT REPORT Allison Technology O Scope PC Oscilloscope Module COMPUTER CONNECTIONS What is user interface design Jeff Holtzman HARDWARE HACKER Halogen cycle mysteries programmable interconnects and more Don Lancaster Aupio UPDATE Service with a smile Larry Klein DRAWING BOARD Converting sparks per second to engine RPM Robert Grossblatt Wuat s News 73 1994 ANNUAL INDEX Q amp A 0 Buven s Mart LETTERS 94 ApveRTISING SALES OFFICES New PRODUCTS 4 ADVERTISING INDEX New LITERATURE Hugo Gernsback 1884 1967 founder Larry STECKLER EHF CET Editor in chief and publisher EDITORIAL DEPARTMENT Brian C FENTON editor Marc Spiwak associate editor Net ScLATER associate editor TERI ScapuTo assistant editor JEFFREY K HOLTZMAN computer editor RoBERT GROSSBLATT Circuits editor LARRY KLEIN audio editor DaAviD LACHENBRUCH contributing editor DoN LANCASTER contributing editor EvELYvN Rose editorial assistant ART DEPARTMENT ANDRE Duzant art director RussELL C TRuELSON illustrator PRODUCTION DEPARTMENT Rusy M YEE production director Karen S BROWN advertising production KATHRYN R CAMPBELL production assistant CIRCULATION DEPARTMENT JACQUELINE P CHEESEBORO citculation dire
293. rinter a modem a network or in this case a user That view might sound ridiculous but that s how many computer and soft ware designers view the situation It would be easy to adopt a con trary point of view POV2 that says the user is primary and the comput er secondary The computer is just another member of the class of things that we human beings use to extend our capabilities much like the car the telephone the micro scope and the telescope This is a tack frequently taken by social sci entists anthropologists and cultural analysts A third point of view POV3 avoids the reductionist simplifica tions offered by the first two It doesn t seek understanding by re ducing a complex situation to a set of interactions among simple ele ments Rather it views the situation as a whole along with the interac tions among the elements as pri mary User interface design thus becomes user interaction design Don t interface interact USER INTERFACE MODEM INTERFACE PRINTER INTERFACE USER INTERFACE DESIGN Is the user just another peripheral with her own special interface Is the computer an extension of human capabilities Or is there something more to it Context If you view the user interface as a conduit between the user and the computer as do both POV1 and POV2 then vou tend to focus on the characteristics of the conduit the objects attached to either end of
294. rogram the microprocessor could build the controller with discreet logic but it wouldn t be as ver satile Do you have any ideas as to what should do D Vitez Clinton PA The old saying If you can t do the time don t do the crime pretty much sums up the problem you have at the moment There s no point in playing with microprocessor hardware unless you also make a commitment to the Great Software God as well one is pretty much useless without the other The 8085 instruction set isn t all that complex and it s fairly repre sentative of microprocessor in struction sets in general If you re having a hard time with this one chances are you ll have a hard time with any of them You might be hav ing a hard time because the trainer programming environment isn t user friendly It s a lot easier to de velop software on a real computer than on a trainer Some microprocessors such as the old 8052 have a BASIC inter preter built in so software can be written in a dialect of BASIC This makes it easier to write software because computer languages don t come much simpler than BASIC 8052 BASIC and newer versions contains the usual BASIC com mands plus special features for con trol applications Single board computers are also available that provide a program ming environment similar to the one on a desktop Software can be de veloped on a desktop computer and either downloaded into the single board R
295. rs we back it up witha guarantee cf satisfaction or vour money back Heathkit is Better Our Exciusrve Computer Aided instruction Makes Learning Easy Fast amp Fun The truly qualified PC Technicians possess knowledge of the inner workings of a computer right down ta the electronics level This is the only type of technician we are inter ested in producing the kind that ends up truly qualified So Heathkit Ra Km amp a Ll 1 B7 In 1 Education WT NISL a Value no J You ve Grown to Expect from Heathkit provides an electronics curricu um in our exclusive computer aided instruction format which is zoda the fastest most effective learning media aro rl and is the most ex en sive elect enics curriculum of it s kind ir the vorld Heathkit is Better We Send You The Gocd Stuff On Day 1 With Heathkit from day 1 you hare the entire training package includir g a fully loaded Zenith Data Systems 486 compter including a SVGA color monitor 2MB of memorv Windows and diagnostic software Other home study schools string vou along for dozens of weeks before they send vou what is by then obso lete pieces of a no name clone that might work if assembled correctly into a computer CIRCLE 86 ON FREE INFORMATION CARD Available EASY GPAYMENT E 4 Our com outer is fully assembled and tested and covered bya 1 year an site warrantee Heathkit is Better You 3e The Judge
296. ry 1995 TECHNOLOGY UPDATE 900 MHz breakthrough New technology launches wireless speaker revolution Recoton develops breakthrough technology which transmits stereo sound through walls ceilings and floors up to 150 feet By Charles Anton f you had to name just one new product the most innovative of the year what would you choose Well at the recent International Consumer Electronics Show critics gave Recoton s new wireless stereo speaker system the Design and Engineering Award for being the most in novative and outstand ing new product Recoton was able to introduce this whole new generation of powerful wireless speakers due to the ad vent of 900 MHz tech nology This newly approved breakthrough enables Recoton s wire less speakers to rival the sound of expensive wired speakers Recently approved technology In june of 1989 the Federal Communications Com mission allocated a band of radio frequen cies stretching from 902 to 928 MHz for wireless in home product ap plications Recoton one of the world s leading wireless speaker man ufacturers took advantage of the FCC ruling by creating and introducing a new speaker system that utilizes the recently approved fre quency band to transmit clearer stronger stereo signals throughout your home 150 foot range through walis Recoton gives you the freedom to lis ten to music wherever you want Your music is no longer limite
297. s Sheets amp Graf C Jul 31 Aug 39 LET Sep 16 Amplifiers Audio Marston Mar 5 Analog Signal Troubleshooting Campbell May 69 And Then There Were None Holtzman CC Jul 6 ANTENNA AM Power Loop Gault C Jun 44 Booster Tunable FM Smith C May 49 Tunable Shortwave Wecke C Jul 0 Antique Radio Vintage Radio Knight Jan 63 LET Apr 12 LET Jun i4 Appie PowerPC Holtzman CC Jul 6 Auction Magazines Lancaster HH Apr 5 AUDIO SEE ALSO AUDIO UPDATE AM Power Loop Antenna Gault C 2 e4 Amplifiers Lancaster HH n 3 Amplifiers Marston Mar 75 4LETJul 16 Bulld the TubeHead Simonton C Jun 33 Power Amplifiers Marston Apr 5 Tunabie FM Antenna Booster Smith C May 49 Upgrade Your Car Stereo Spiwak Mar 52 Wizard Test Generator Wannamaker C Apr 41 AUDIO UPDATE JSIoROtES Jan 87 Feb amp 0 pr 96 May 82 Jul 78 Sep 2 Oct 83 Nov 80 Dec 6 Audiophile Silliness Feb 0 Collecting Old Audio Apr 96 Crystal Balling the Future May amp 2 Directional Hearing Nov amp 0 Dynamics of Music and the Evolution of Audio Instrumentation Mar 76 Joys of Audio Clipping The Sep amp 2 Question of Power A Jan amp 7 Sound of Digital Compression The Dec amp 6 Sound Pressure ier Damage Sonic Realism Jul 78 Sound Offs CSICOP and Audiophilia Oct 3 Automatic Rechargeable Flashlight Spiwak C Oct 5 AUTOMOTIVE Adding Old Fashioned Gauges to Modern Automobiles Grossblatt DB Alterna
298. s 516 W 34 St New York NY 10001 2 igh N This low circuit loading scope probe B produces a 60 dB Spectrum analyzer MC RFI display on your Inexpensive scope Ask for application notes specifications sales amp warranty info A LE s 255 Spectrum Probe 30 KHz to 2 5 MHz 279 Also TO 22 Clip on Hett Binks 153 each That s 60 cheaper 107 Probe 1 100 MHz 249 279 extra shieiding Accessory Current Adapters IA5 19 IA7 29 SMITH DESIGN 215 661 9107 207 E Prospect Ave N Wales PA 19454 Electronics Now January 1995 THE AMAZING RADIOSONDE G5058 6 95 2 12 00 Very lale model Radiosonde made for tracking all types of weather data These were to be sent aloft attached to a weather balloon not included Each is about 10 1 2 long x 33 8 thIckx 8 wide Inside of the removabie cardboard sleeve is a styrofoam chamber housing a sophisticated 8 IC circuit board which has sensors attached to measure atmospheric pressure temperature and humidity As it gathers the information it transmits the data at about 1 677 gigahertz GHZ These are prime brand new units that were waiting shipment from the manufacturer Space Oata Corporation to the government when the contract ended These are complete except for the 24V battery we connected two 9V batteries in series and the unit worked perfectly from them Sorry No schematic available These cost the government a bundle to have made but we are selling them at
299. s ETT INC PO Box 240 Mas sapequa Park NY 11762 0240 CRYSTAL set Handbook Visit antiquity by building the radios your grandfather built Assem ble a Quaker Oats rig wind coils that work and make it look like the 1920 s Only 10 95 plus 3 50 for shipping and handling ELECTRONIC TECHNOLOGY TODAY INC Box 240 Mas sapequa Park NY 11762 0240 US funds only USA and Canada no foreign orders SURVEILLANCE Countersurveillance bugging phone tapping detector telephone fax encryption vehicle tracking covert video transmitters kit and more A B ELECTRONICS 718 253 3637 SURVEILLANCE Transmitter kits 65 to 305 MHz Quick amp Easy Partially assembled units Five minutes completion 110 volt duplex recepta Cle room battery types and telephone Counter surveillance Catalog 2 00 SHEFFIELD ELEC TRONICS PO Box 377940 C Chicago IL 60637 7940 HIGH Voltage Devices Spectacular fork lignt ning displays Amazing construction plans in clude air core Tesla coils resonant induction coils Cockcroft Walton voltage multipliers elec trostatic generators Kirlian electrophotography ion electroscopes negative ion generators Cat alog 1 00 SCIENTIFIC Box 1054ENC Duvall WA 98019 FM BAND Xtal locked 30MW broadcast transmit ter kit mono US 49 00 stereo US 99 00 postage US 20 00 shipment CD FM Australia phone fax 61 8 3640902 Amex amp Visa TOP quality imported domestic kit
300. s computers components surplus discount electronics parts auto home electronics lasers Catalog 2 00 TEKTRASONIX 740 E Bay Avenue Manahawkin NJ 08050 MASTERCARD AND VISA are now accepted for payment of your advertising Simply complete the form on the first page of this section and we will bill THIS 1S AN EXPANDED TYPE AD WITH A TINT SCREEN See how it jumps out on the page To order your ad in this format calcu late the cost at 5 90 per word for the ex Was TGS Converters amp Descramblers Jerrold SA Tocom 0ak Zenith More Why tolerate unbearable monthly cable fees when you can buy for less at Muiti Vision MAY THE SOURCE gt BE WITH YOU Tap into THE SOURCE of useful government publications the free CONSUMER INFORMATION CATALOG Send your name and address to Consumer Information Center Department Source Pueblo Colorado 81009 mH ee B E BEST BY MAIL T B Y M A L p OR PART TIME JOB BUSINESS Rates Write National Box 5 BEST BY MAIL FL 34230 OF eee INTEREST TO All TO ALL FOR THE LOWEST Priced Computers Printers And FOR THE LOWEST Priced Computers Printers And Hard ware Call 800 540 2855 PINBALL MACHINES BOOKS Parts Supplies Catalog d MARCO 2401 RE Sunset West Columbia SC 29169 4717 RELIEVE STRESS NATURE To Classical Audio Cassettes CD s Catalog 9 95 Video Vault 3081 Hillcrest Avenue Ne koosa WI 54457 PLAY PIANO LIKE LIBERACE 1 0
301. s the log to disk option and Escape terminates the program and returns to DOS To use O Scope both it and the PC must be powered up before the two are connected together O Scope should also be powered and connected to a PC before the probe is connected to an external circuit O Scope has an input imped ance of one megohm and a max imum input voltage of 60 volts DC or 40 volts AC It is accurate to within 3 to 4 Although the scopes input is fuse protected ex cessive voltages can damage both the module and the computer so it might be better to use an older com puter with the scope module and reserve your new 486 or Pentium based machine for more conven tional applications The perfor mance of O Scope will not be enhanced by a powerful computer All in all the O Scope should be especially easy for anyone familiar with both PCs and oscilloscopes and easy to learn for anyone un familiar with either or both Even though the 169 95 fully as sembled O Scope is a practical investment for an electronics hob byist avid kit builders might want to take advantage of the extra savings 50 offered by purchasing the kit version Building the kit is not com plex there is enough work to keep a builder busy for about an evening A DMM is the only instrument needed for checking voltages and con tinuity Calibration calls for adjusting only a single potentiometer that roughly centers the O volt DC level
302. s to its old cable boxes and in some instances we destroy the boxes if we cannot sell them to a repu table source Cablevision prides itself on being a leader in the field of ad dressing theft It conducts due diligence inquiries on con tractors and vendors with whom it does business It will sell old cable products only to a dis tributor who can document the inventorys destination or to a li censed franchise cable operator Future problems Interactive television will dra matically change the content of cable programming and the problem of signal theft In late 1994 Time Warner Cable Sys tems was scheduled to intro ducing interactive television to some 4000 homes in Orlando Florida The Orlando project will cost about 5000 per household Digital Equipment Corp and General Instrument Corp are joining forces to pro duce the interactive equipment which will combine DECS mi croprocessor distribution and storage technologies with GI s encryption system that allows financial and other information to be sent confidentially The Orlando endeavor is the largest of many interactive tele vision projects that will get un derway this year Interactive television will ultimately change the concept of the cable oper ator who will be offering much more than simple television programming EMInteractive television is the result of a mer ger of the technologies of many industries computer cable television and te
303. screen bloomed into a field of snow and the hiss of static overcame the audio The cable box had turned itself off The next day the remote con trol worked fine with the TV and VCR but not with the cable box I called my local cable company and asked if it was experiencing technical difficulties A spokesman for the cable compa ny declared No its those uni versal remotes They re always causing problems with our boxes If you rent one of our re motes it ll work just fine Rather than follow this sug gestion I returned my cable box and swapped it for a new one thinking that the problem would be solved The replace ment box worked just fine but a few days later the remote control started acting up again Mystified I called Universal Electronics makers of my One For All remote control and ex plained my problem The cus tomer service representative said he had nct heard about my spontaneous switching prob lem before but he suggested that the cause could be in the code for my cable bcx I was given a speciai code to reset my remote control and then I tried all the codes for my Scientific Atlanta cable box Everything worked well for a couple of hours before the glitch finally returned I thought about probable causes and over the next few day I carried out a concerted attack on the mystery First I bought new batteries for my remote control then I rented a dedi cated remote contro from the cable company
304. se units is around 600 1 om p NOM Portable MOGO Wormnimal 45 Flip up LCD display 9 16 VDC Can communicate with Pa i Sd computer having RS 232 port Can communicate with X another Microterminal Use by itself as electronic T T notebook Onboard microprocessor data RAM 32K S x o Ed and Video RAM 64K Complex built in diagnostics and set up capabilities e Original intention for POS applications m eo e display size 40x16 256 x 128 pixels Dimensions 6 3 W x o mi H E La fpi LCD up height is 7 1 or 2 A Po All in one 286 board t A includes 286 12Mhz CPU 1 wait state Built in IDE amp floppy con coprocessor socket FAST on board SVGA with 256K RAM 2 serial ports 1 printer port mouse port EMS LIM ver 4 0 memory amp shadow RAM support Up to 8 mb memory 256K or 1 Mb SIMMS Comes with OK on board On board speaker REAL TIME CLOCK Phoenix BIOS Note There is ong long non standard bus connector on board Minimum Order 20 00 Minimum shipping and handling charge 5 00 We accept cashiers checks MC or VISA No personal checks or COD s CA residents add 8 25 sales tax We are not responsible for typographical errors Ali merchandise subject to prior sale Phone orders welcome Foreign orders require special handling Prices subject to change without notice 20 restocking fee for returned orders NEW BASIC STAMPS Stamp Sized Modules Run BASIC BASIC S
305. shows how the cir cuit in Fig 8 has been modified to give the op amp a 50 megohm input impedance Zin The location of capacitor C2 has been changed and the lower end of resistor R3 is con nected to the junction of R2 and C2 rather than directly to ground The AC feedback signal that appears on the R2 C2 junction is nearly identical to the input signal at pin 3 As a result near ly identical signal voltages ap pear on both ends of resistor 6 FIG 10 AC VOLTAGE FOLLOWER with 100 kilohm input impedance MON S21U04 29 3 GEE i Aenuer Electronics N w January 1995 R3 Thus it passes negligible signal current Theoretically the apparent impedance of R3 is raised to thousands of megohms by this bootstrap feedback action but in practical circuits the in put impedance is limiited to about 50 megohms by external leakage paths in the op amps mounting socket and or the cir cuit board For optimum biasing of the circuit in Fig 9 the sum of the values of resistors R2 and R3 should equal R1 However in practical circuits the value of R3 can differ from this ideal by as much as 30 Thus a 100 kilo hm resistor will work for R3 Voltage followers An op amp can function as a voltage follower if the inverting and noninverting connections are combined for unity voltage gain Ideally the differential am plifiers output responds only to the difference in voltage be tween the two inputs and does not resp
306. sinewave HBO Cinemax Show time UHF Adult 12 95 2 00 postage CABLETRONICS Box 30502R Bethesda MD 20824 ANTIQUE RADIO CLASSIFIED Free Sample i ne Antique Radio s Ou Largest Circulation Monthly BEQ Articles Ads amp Classifieds ea Se 1 6 Month Trial 16 95 1 Yr 31 95 47 95 1st Class A R C P O Box 802 L13 Carlisle MA 01741 PRINTED circuit boards etched drilled tin ipud Single sided 1 25 sq inch CHELCO LECTRONICS 61 Water Street Mayville NY 14757 1 800 388 8521 Fax 716 753 3220 TEST equipment pre owned now at affordable prices Signal EE from 50 00 os cilloscopes from 50 00 Other equipment includ ing manuals available Send 2 00 U S for ZR refunded on first order J B ELEC TRONICS 3446 Dempster Skokie IL 60076 708 982 1973 PAY TV AND SATELLITE DESCRAMBLING B new inta VOLUME 6 EN Volume 6 our best yet details all known fixes for ali cable wireless and satellite systems Many do it yourself Schematics included Only 15 95 Pay TV Volumes 1 5 all different Hacker Video VHS Build Satellite Systems includes DBS all these titles 15 95 each 3 34 95 5 52 95 new catalog 1 All our info 129 95 Scrambling Mews 1552 Hertel Aye 123 Bunalo NY 14216 Voicarar BB 716 874 2058 DOO ARE DX ADD 5b Wireless Cable Hacking Compleat Wizzard VC2 Monthly Newsletter 29 95 yr CABLE TV converters descramblers Scient
307. sions that manufacture products ranging from re lays sensors switches and transducers to other parts like actuators and cir cuit breakers The four color brochure details catalogs from divi sions that include Arrow Hart Consolidated Con trols Control Displays Cutler Hammer Heinemann and MSC Products to simplify select ing the right one for the specific products you need The Entrepreneurial PC The Complete Guide to Starting a PC Based Business Sec ond Edition by Bernard J Davis Windcrest McGraw Hill Blue Ridge Summit PA 17294 0850 Phone 1 800 233 1128 Fax 717 794 2103 17 95 This book explains how to turn your personal com puter into your principal production tool for a per sonal computer based business venture It could be writing accounting consulting desktop gra pics preparation or any of a number of other interest ing possibilities The author discusses the requirements for suc cess in any new venture and explains how to evalu ate your skills goals and readiness to start your own business You ll learn how to select the right business to match your expectations and skills how to make a business plan sell your ser vices and run your home based business It also explains how to choose the necessary computer software hard ware and peripherals for your new business The book discusses finances including the need for start up money and where to get the money
308. st Butler Drive Phoenix AZ 85051 EXPLORE Experiment Discover Science with PowerGraph PC Mac interactive software Multicolored MathArt educational games orbits chaos Easily plot equations perform simulations and real experiments 34 00 MICROPHYSICS 1 800 286 3527 eas T gt GR SIGNAL ELITATOR Shing ih Trhimmsl CABLE TV 50dB NOTCH FILTERS for inter ference removal or channel censoring Filters are user adjustable to desired channel or frequency Eight Models available each for certain channels 2 amp 3 4 to 6 7 to 13 14 to 17 18 to 22 23 to 29 30 to 36 95 to 99 plus O amp 1 Just 30 each or 3 for 75 includes shipping ONE MONTH MONEY BACK fast delivery Visa MC check or M O C O D is 5 extra Huge discounts for higher quan tities STAR CIRCUITS P O Box 94917 Las Vegas NV 89193 Call 24 hours 1 800 535 7827 a CRYSTALS Radio and microprocessor low price fast delivery all brands prototype produc tion runs VELCO ELECTRONICS 716 924 2073 fax 716 924 2136 Visa MC CABLE TV converters Jerrold Zenith Oak Sci entific Atlanta all brands available Link yourself to the future Visa Mastercard COD accepted CABLE LINX INC 1 800 501 0095 1995 CATALOG OF THE WORLD S MOST FAMOUS CB ANTENNAS amp ACCESSORIES FIRESTIK FREE CATALOG OFFER 2614 E Adams Phoenix AZ 85034 Write or Call 602 273 7151 CB Radio Modlfications Frequencies
309. st response rotary vane vacuum pump that pro vides a vacuum at 23 inches of mercury in 150 milliseconds which can withdraw molten solder in 30 milliseconds A variable pressure output control ad justs hot air flow for sur face mount component solder reflow Zero voltage thyristor switching pro tects voltage and current sensitive devices against transient voltage spikes Both the 120 and 240 volt SMD 250 models are priced at 1995 Automated Production Equipment Corp A P E 142 Peconic Avenue Medford NY 11763 3201 Phone 516 654 1197 Fax 516 289 4735 PORTABLE SCOPE PLUS METER Fluke Corporation has introduced the latest of its ScopeMeter test instru ments the Series Il It com bines a dual channel 50 MHz digital storage os cilloscope and a 3 true RMS multimeter in one battery powered handheld unit The new models have additional measurement functions including a mea sure menu that automat ically configures the instru ment for any of 30 measurement tasks and a continuous autoset function that eliminates the need for manual front pan el adjustments when the probe is moved from one test point to another The instrument can be switch ed back to conventional operation at any time series Il ScopeMeters offer a windowing menu structure that gives quick access to any function with a few keystrokes More over a Series ll in meter mode continuously dis plays waveforms simult
310. step by x In octant 3 always step by x and sometimes step by y In octant 4 always step by x and sometimes step by y In octant 5 always step by y and sometimes step by x In octant 6 always step by y and sometimes step by x In octant 7 always step by x and sometimes step by y For the maximum possible speed replace on the fly calculations by table lookups compiling special hardware or similar techniques FIG 2 VECTOR TO STEP CONVERSION is a fundamental tool in computer graphics Here is how to do it The details will vary with your end use only north would miss the middle of A position in space is said to be the path The trick is to find a set of absolute if itis measured from some rules that permit just enough north 0 0 axis reference point A positior and east steps to be taken in just is relative if it is measured from the the right order to approximate the last determined or referred position path as closely as possible in space A 10 2 mile straight line hike is considered absolute if you start from home and end up 10 2 miles from home Now suppose that to day s hike part of a week long trek lands you 10 2 miles from this morn ing s start That s considered to be a relative position Typically absolute positioning is used for the first point in any path while relative position is used for all points that follow The first step in a vector to step Conversion is to correct the vector Typic
311. t worked By contrast 12 6 volt cen ter tapped transformers are avail able widely connect one wire to the center tap and the second wire to the end terminal Third a shorted transformer con nected as shown will overload the transformer in the tester think a resistor should be connected be tween the top terminal of the 6 3 volt secondary and the top terminal of the AC voltmeter That would also give a larger voltage drop if there were a shorted turn on the trans former under test However there would be a very small drop across the resistor if the transformer is good would choose the resistor that would limit the current to the trans former s current rating For a 6 3 volt 1 ampere transformer it would be a 6 2 or 6 8 ohm 10 watt re sistor for a 6 3 volt 0 2 ampere transformer it would be a 33 ohm 2 watt resistor Fourth there is a possible safety hazard in the project If another 6 3 volt transformer is being tested and the secondary winding is connected to the test circuit nearly 120 volts would appear on the unconnected primary leads of the transformer un der tested if it is a good unit To avoid this hazard first measure the resistance of the windings of the suspect transformer with an ohm meter and then connect only the winding with the highest resistance to the test circuit Fifth many of the items pictured in the photograph accompanying the article cannot be tested with this circuit
312. table for being customized For example you could connect the output of an A D converter to Port A then vary power levels based on some analog quantity When creating your own rou tines be sure to include it in both the power on Select rou tine and the Jump Table That way the controller will know where to find it 0 SIGNAL THEFT cian and enter competitions By 1996 it is estimated that the U S market for digital cable converters will reach 4 5 million units annually as cable compa nies upgrade the 65 million converter boxes now in use The new converters in conjunc tion with digital compression and fiberoptic cable will ex pand the television receiving capacity to perhaps as many as 500 channels Numerous joint ventures are underway to develop a new con verter and the result is that sev eral types of converters will be on the market Among the proj ects in progress Hewlett Pack ard is building a radio based system Intel Microsoft and General Instrument are creat ing a cable box based on Intel s microprocessors and GIs digital compression technology Scien tific Atlanta is building digital terminals for Time Warner s Full Service Network and U S West s video dialtone trial There is an industry wide re quirement for adequate signal security A pirate who develops the technology to intercept a digitally compressed signal might be able to access a per son s bank account ATM num ber a
313. tamp Module BS1 IC 8 general purpose 0 lines 256 byte program space 100 instructions 4 MHz clock 2400 baud serial etc 29 39 with carrier board BASIC Stamp Il Module BS2 IC 16 general purpose 1 0 lines 2048 byte program space 600 instructions 20 MHz clock 9600 baud serial etc 49 59 with carrier board They re here These new BASIC Stamp modules are the latest in BASIC Stamp computers These modules are perfect for numerous applications from controlling model trains to monitoring factory sensors They have 8 or 16 I O lines which can be used for a variety of digital and analog purposes And like the original BASIC Stamp these modules are programmed in BASIC Our special PBASIC language includes familiar instructions such as GOTO FOR NEXT and IE THEN as well as SBC instructions for serial 1 O pulse measurement and button debounce In the new BS2 IC there are even instructions for interfacing to popular devices from other companies such as the Dallas Semiconductor Time In a Can real time clock Carrier board provides battery clips prototype area and PC connector The BASIC Stamp Programming Package contains everything you need to program Stamps using your PC The package includes our editor software programming cables manuals application notes and free technical support The package is available for 99 Stamps must be purchased separately PIC16 17Cxx DEVELOPMENT T
314. te Tachometer Design Takes Shape Our Grossblatt DB Completing the Tachometers Spark Counter Section G Grossbiatt DB Different Tachometer Design Approach A Grossbiatt DB Our Automotive Power Supply Comes to Lite Grossbiatt DB PLL Section of our Tachometer The Grossblatt DB Power Supply A Closer Look at Grosbiatt DB Two Possible NOE for our Tachometer s Countin EU rossblatt DB Upgrade Your Car Stereo Spiwak Why Build a Tachometer Coosatatt DB B B K Precision LCR Bridge ER Battery Backup QA Battery Chargin ae Lancaster H Benchtop Digital Po Wavetek BDM40 ER Binary Chain Codes Lancaster HH Bipolar Transistor Circuits Marston Body Heat Detector Long Range lannini C Bonker The Sonntag C Borland WordPertect Holtzman CC Jan 28 Oct 86 Nov 86 Sep 84 Feb 82 Jul 80 May 86 Jun 29 Mar 52 Apr 24 Sep 22 Sep 8 Oct 75 Jul 20 Oct 75 Jan 70 Feb 38 Nov 47 Mar 91 BUILD A AN THE THIS SEE CONSTRUCTION Bus Switches Lancaster HH Caller ID Weeder C Car Stereo Upgrade Your Spiwak Catch an April Fool Spies C CD ROM Directory Lancaster HH Chaos Creating Sonntag C Clock Kit Digital Jameco JE725 ER Clock 68705 Based Experimenter s Beard C Cioser Look at our Automotive Power Supply A Grosblatt DB CMOS Paranoia QA Cogeneration Resources Lancaster HH Coin Mechanism Sources Lancaster HH Coid Fusion Update
315. ted the BY counter is adjusted and test ed to see if the last byte has been processed Again the program loops until all bytes have been processed With the powerful instruc tions available in QBASIC the whole procedure can be com pleted with just a few lines of code FOR J 3 TOO STEP 1 FOR X 7 TOO STEP 1 IF PEEK VARPTR N amp J AND 2X gt 0 THEN dt 2 ELSE dt 0 OUT dp 0 dt 4 OUT dp 1 dt 4 NEXT J NEXT X The IF PEEK line is fairly complex The FOR NEXT J loop accounts for the bytes and the FOR NEXT X loop handles the bit tracking Starting from the inside and working out the VARPTR N amp function returns the address of the variable N amp Thousands of Successful NRI Graduates Are Proof af the Quality and Effectiveness of NRI Training NRI s been successfully training people for new electronics careers for more than 80 years Regardless of your previous experience you can succeed with NRI too Experience First Hand the Intricate Electronics Inside Todays Computers gt ut NRI s highly acclaimed Discovery Learning Method the learn by doing approach that gives you first hand experience with the intricate electronics behind microcomputers is the most effective way to learn a new Skill You start with NRI s Discovery Lab a complete breadboarding system that lets you design circuits modify them and then diagnose and repair faults You then go on to build a state of
316. the art 486sx 25 MHz Intel based computer from the keyboard up You install the power supply 3 5 floppy drive hee 200 meg hard drive and Super VGA color monitor This powerful system which also features a Pentium overdrive ready motherboard and today s most sought after peripherals CD ROM drive sound card and speakers is all yours to train with and keep What s more you perform diagnostic tests using the At NRL We Let Our professional level Ultra X R A C E R plug in card and Quick Tech ve software all included in your course om Plus NRI training includes fully integrated software packages MS DOS 6 21 QBasic and Microsoft Works and skill building interactive projects to give D Th you complete confidence in a wide range of applications UM e Train in the Privacy of Your Own Home amp No prior experience necessary with your personal instructor and wes NRI s team of technical specialists behind you every step of the way you learn at your own pace no classroom pressures no night school no need to quit your present job until you re ready to make your move oN Just two years after finishing the NRI M Take Advantage of Todays Money Making SA training in microcomputer servicing Opportunities i in Computer Repair a I set up my own company I contract at The Department of Labor forecasts over 220 000 jobs for computer myself out to several computer retailers as their service techni
317. tion from World College Take charge of your future in electronics Engineering Degree No Hassles No High Cost Four Powerful Reasons To Connect With World College Today T Earn yourfour year s degree 2 Self paced m training 3 Independent study in sg yourhome Expert m instruction Give MeThe Power send me a FREE World College course catalog today Please Print Neatly B Name Address City State Zip Phone Age For faster service call 1 800 696 7532 or call 1 804 464 4600 Or fax this coupon to 1 804 464 3687 5 WORLD COLLEGE Lake Shores Plaza 5193 Drive Suite 113 Virginia Beach VA 23455 2500 JI Affiliated with Cleveland institute of Electronics m H Bem ua a CI Electronics Now January 1995 CERTIFICATION PROGRAM The Mobile Electronic Certifica tion Program MECP is the only industry wide nationally recognized testing program available for in stallers of 12 volt battery powered electronics equipment The pro gram is intended to improve the quality of installations of those prod ucts which leads to a decrease in product returns and an increase in customer confidence The MECP will be administering tests at various locations across the country in the first three months of 1995 In January they will be given in Indianapolis January 5 Las Vegas d
318. tion support For more product information see your Fluke distributor today Or call 1 800 59 FLUKE for a direct connection to a distributor near you EY Paccessive Gross Testing Serious Tools for Serious Work For technical or application support call 1 800 44 FLUKE 1994 Fluke Corporation P O Box 9090 M S 250E Everett WA USA 98206 9090 Canada 905 890 7600 Europe 31 40 644200 Other Countries 206 356 5500 l 1 j K E All rights reserved Ad No 00621 CIRCLE 121 ON FREE INFORMATION CARD ptt Sy DET MODE i VERTICAL LOG ALIN Fa 9 1 cuz ps 71 1 ti MMIH 10 0 MHz M 1 Le me a M M See Design work is faster and cheaper with Electronics Workbench Mark Weaver Production Engineer Technician Colorado Memory Systemis HP Hectronics Workbench is a highly productive bench where you design and verify circuits in a fraction of the time Connections are always perfect Wires route themselves And the simulated components and test instruments work just like the real thing poenas ai E oem Sot Digital Module Analyzing a logic circuit It s faster than building with actual components because you change connections and component values instantly And since the simulated components are free you don t need to replace burnt out parts or keep an extensive inventory The result You save prec
319. tional Medal of Technology in recognition of their contributions to America s technical innovation and economic competi tiveness The Presidential Awards were granted by Commerce Secre tary Ronald H Brown to Amgen Thousand Oaks CA Corning Inc Corning NY Joel S Engel Amer itech Corp Richard H Frenkiel AT amp T Consumer Products H Joseph Gerber Gerber Scientific and Irwin M Jacobs Qualcomm Amgen the world s largest bio tech firm was granted a medal for its development of innovative medi cations for critically ill patients based on cellular and molecular bi ology Amgen scientists discovered and introduced genetically engi neered human erythropoietin or Ep ogen a protein essential to the maturation of oxygen carrying red blood cells Epogen for treating anemia in kidney dialysis patients has virtually eliminated the patient s need for blood transfusions Another Amgen developed product is Neu pogen a recombinant protein that stimulates the production of infec tion fighting white blood cells Neu pogen decreases possible infection associated with chemotherapy Corning well known for its glass products was honored for its tech nical innovations over the past 125 years A Corning glass envelope en closed Edisons first incandescent light bulb and fiber optic cables from the company are now replacing cop per wires in telephony and com munication Corning has also participated in su
320. tions Test Equipment business lo cated in France CTD developed the first modular test set capable of testing all kinds of radio communications systems It now builds test equipment for vid eo transmission data communica tion and fiberoptic networks Schlumberger will retain a minority interest in the business Continued on page 16 5100 Cash back on any TekMeter See your distributor today Offer expires December 31 1994 TekMeter can show you the answer before you even know the question TekMeter is the new handheld instrument from remain free to probe more accurately and safely Tektronix that combines the functions of a DMM and Especially in small places an oscilloscope It s practically auto everything Weighing barely 2 pounds TekMeter includes a host Which in the service business means you ll get the of features like cursors and spike detect that improve answers you need faster than ever before your ability to maintain and troubleshoot a wide range It s easy Just connect the probes TekMeter finds of equipment TekMeter can even capture aS the signal then makes the correct scope or DMM set incoming line voltage spikes and sags 4s tings to display voltage current or waveforms in the measure voltage and current simulta most meaningful way What s more your hands neously compute true power and more ge All automatically For as little as 875 m i j TekMeter is the answer you ve b
321. tly sight touch and sound but eventually including taste and smell It won t be long before so called virtual reality tech nology gives rise to the VUI GUI building tools such as Visual Basic and App Studio must evolve from being only drawing tools for creation of static screen objects to become interface simulators that allow self modifying actors to inter act In this scenario userinterface design becomes less like a drawing activity and more like specifying the rules of an expert system Objects Object oriented technology holds some promise for improving user interface design The reason has nothing to do with encapsula tion inheritance or polymorphism It is rather the real world modeling that frequently accompanies o o technology projects The problem here is model proliferation The human body is a good analogy In it multiple subsystems circulatory respiratory nervous skeletal mus cular coexist and interact simulta neously As software continues to increase in complexity a similar concept is necessary so that user interface design and implementa tion can proceed essentially inde pendently of functional design and implementation The question then becomes how computer system design generally can evolve to support multiple si multaneously functioning and inter acting subsystems explicitly But that s a topic for another time Meanwhile don t let anyone fool you There is much more to user inter
322. to produce a sinewave symmetrical around zero volts It also must be fil tered to produce clean sine waves Because the number of sam ples per sinewave cycle is equal to the ratio of the clock frequen cy and the desired output fre quency it can be seen that at 5 megahertz the number of sam ples forming the sinewave will be 6 4 32 MHz 5 MHz which is a pretty steppy sinewave The two problems filtering and level shifting are solved by the Maxim MAX436 wideband transconductance amplifier IC5 A transconductance ampli fier is a true differential ampli fier with high impedance in puts t provides accurate gain without negative feedback eliminating closed loop phase shift This is the main cause of oscillation in voltage output high speed amplifiers The out put of the transconductance amplifier is a current that is proportional to the differential input voltage and the amplifier is virtually short circuit proof The gain of the circuit is set by the ratio of two external imped ances and an internal current gain factor K Gain K Z oap Zr The device also has a band width in the 275 megahertz range with an 800 volt per mi crosecond slew rate For level shifting R9 is con nected between 5 volts and ground with its center tap fed to the negative input terminal of the MAX436 Simply adjust R9 so that the output signal is sym metrical about ground Three resistive capacitive RC sections are distr
323. tory Post service servicing My career as a service technician continued after the Army After sev eral jobs with local car and home radio repair shops found myself repairing test and hi fi equipment for the Electronic Instrument Company EICO during the day attending col lege in the evenings and freelancing hi fi repairs over the weekends This went for five years or so until traded in my soldering iron for the proverbial blue pencil and became lu Ix f i v EOM pos Young Larry Klein on a service call Note the tubes anc tools in the attache case service kit the technical editor of Popular Elec tronics One might say that went from repairing electronic equipment to fixing electronics prose but per haps not During the time I ve been in pub lishing I ve witnessed the advent of the transistor the IC and the slow demise of tube electronics From a very personal point of view the vir tual takeover by solid state elec tronics has somewhat saddened me It s not that found something romantic in the soft glow and warmth of tube equipment it s just that when something went wrong could fix the damned thing sus pect that now enjoy repairing old tube radios from yard sales and thrift shops mainly to offset lurking feelings of electronic impotence My slow transition from Mr Fixit to a narmally incompetent elec tronics consumer was painful but inevitable As we all k
324. tput if the same signal is applied simulta neously to both of its inputs Supply voltage An ideal am plifier would be unaffected by reasonable variations in power supply voltage Practical monolithic op amps The 741 is a mature popular general purpose monolithic IC operational amplifier A bipolar device it was developed more than 25 years ago by Fairchild Semiconductor Corp acquired by National Semiconductor Corp as the A741 an im proved version of its A709 It has retained its popularity and become an industry standard The A741 had internal fre quency compensation and full overload protection on both its inputs and output Many different manufac turers make their own brands of the A741 and some have im proved the performance of the original Nevertheless all have similar electrical charac teristics Among the alternate sourced 741s are four versions from Analog Devices four from NON INVERTING O INPUT INVERTING C INPUT OFFSET NULL amp FIG 1 SCHEMATIC AND CONNECTION DIAGRAM for the industry standard 741 operational amplifier OFFSET NULL 41 INVERTING INPUT F NONINVERTING OUTPUT FIG 2 PINOUT DIAGRAM for a 741 op eration amplifier in an eight 8 pin plastic DIP package zum um s d zs V Eos Wwe 1 POWER SUPPLY T TR TANG CONNECTIONS FIG 3 SCHEMATIC SYMBOL for a 741 op amp Harris nine from Maxim eight from National S
325. tractor starter battery and more Sealed in a high impact polystyrene case Bolt and nut type terminals Dark blue color Dimensions 7 W x 6 1 2 H x 2 15 16 D Net weight 14 Ibs Limited EN 392 030 Isotip Butane Soldering Iron The ideal soldering iron for field repairs where no AC power is present Operates for up to 100 min utes of continuous soldering per refill Uses stan dard butane not included available at most stores Tip temperature is adjustable up to 1067 F Iron also comes with a torch attachment which easily screws on in place of the soldering tip As a torch one refill will provide up to 1 hour of continuous flame Temperature is adjustable up to k 2372 F A protective cap with a buil ISORTIP Ne in striker and 2 4mm tip are included dies soldering iron Limited one year warranty EN 370 235 ss Vi ossosssosses ssRBOBEBBBBOBEBBEBBOUSSEBEBOSBSBOSSUVEBEREROU Fluorescent Magnifier Bench Lamp Multi position 45 fully adjustable swing arm with metal C clamp Features a bright 22 watt fluorescent tube 4 5 8 diopter magnifying 3x magnification factor and wire clip for easy removal installation of fluorescent tube UL listed 117 VAC Black color Net weight 7 1 2 Ibs PENPOSOSED LL erue ero cto mata o cd REY e no A 2MHz Function Generator Versatile digital function generator provides sine square triangle pulse and ramp waveforms from 0 2 Hz to 2 MH2 in 7 ranges 4 d
326. trol eight dis crete power Triacs each of which delivers power in 32 smoothly graduated steps rang ing from O to 9756 of full power The value delivered to one chan nel is independent of the value delivered to any other channel Loads can include light dis plays universal motors heat ers and other appliances In this circuit the power level is set by software not a potenti ometer The software includes a basic set of routines for process ing interrupts and setting the power level The software also includes five test and demon stration routines for putting the circuit through its paces Moreover theres plenty of room to add your own routines to the 687055 built in EPROM An easy to build single sided cir cuit board makes assembly easy The basic circuit is simple yet versatile enough to accept inputs from on board DIP switches alternatively the in puts can be driven from a micro computer bus or parallel port or a stand alone device with TTL compatible outputs There are 12 input bits to set modes and specify values Circuit design The circuit shown in Fig 1 consists of a power supply AC line synchronizer Triac output control input circuitry and support devices The power supply is a conven tional 5 volt circuit built around a 7805 regulator IC3 and several other components transformer T1 bridge BRI and C1 C4 The AC line syn chronizer consists of an op tocoupler IC2 a current
327. ts is OrthoLogic There is more on the subject of elec tronic compasses in my Hardware Hacker reprints Vector to step conversions Suppose you want to mill a diago nal cut on a CAD CAM machine that can step only north south or east west How would you do it Or suppose you want to show a slanted line on a raster scan display or per haps on a laser printers bitmap Maybe you want to map a tumbling Se 1 ector to step MON 91U04 98j3 G66 Menuer Electronics Now January 1995 three dimensional object with ani mation software All of these tasks require vector to step conversions These are some of the most basic and impor tant requirements in computer graphics A short review of the fun damentals is given in Fig 2 A vector is a number that expres ses two or more values such as speed and direction For example the representation of walking east northeast ENE for 10 2 miles is a vector quantity Vectors can be resolved into their basic compo nents For instance by walking 10 2 miles ENE you will arrive at the same place as walking 9 4 miles due east and then walking 3 9 miles due north Trigonometry can resolve vec tors As an example ENE is at an angle of 22 5 counterclockwise from east By multiplying 10 2 times the cosine of 22 5 you will obtain the 9 4 mile east component Also 10 2 times the sine of 22 5 gives the 3 9 mile north component Obviously walking the 10 2 mile direct
328. tter Slreet Sweeper radar Lidaro Carjac Kidnap Follies Volce Disgulser Hearing Assistor Shrlek Module EM Lab amp Counlermeasure TENS 6Ih Sense Communicalor Phone Color Box Lineman s Handsel DTMF Decoder Bug amp Tap DeteclorBlaster Subliminal MixevAmp Alte Device Hieronymus Machine Neuro phone Resonant PM Magnelometer Levilator Vare tex Generalor RF amp Microwave Ultrasonic Jammer amp Recelver Infrared Deteclor Long Range Eavesdropper Noise Cancelling System Unknown Presence Delector Electronic Dowser many more devices See Calalog CELLPHONE MODIFICATIONS eg Our g lor our iniamous Cellphone modification e 69 detailed comprehensive covers all makes 0 times more info than competitors guides Do apa clal Projects below for uo to date hardwase Software SPECIAL PROJECTS We design bul pis d mocy mainiain ang or Consul on any device system process or project electrical electronic computer phone mechanical optical auto motive invention o Confidentiality guaranteed Describe and Include proe ee does not obligate you Time and cost estimates In 7 10 days VOICE MAIL HACKING How Voice Mall Box VMB systems are used and the specific ways they are hacked Includes ASPEN MES SAGE CENTER SIX GENESIS EZ SYDNEY PHONE MAIL AUDIX CINDY CENTAGRAM SPERRY LINK RSVP etc Absolutely required for all users sysops and security personnell 29 PBX HACKING 1 4 Ws n PB
329. tween it and the most popular mainstream system The June 94 beta version of Win dows 95 shows a typical Microsoft response to the migration problem The W95 shell takes a step toward OS 2 like consistency and ele gance but fails to go all the way Of course because it is a beta the shell can and almost certainly will change but given Microsoft s histo ry doubt that it will go as far as OS 2 has This is a smart marketing move by Microsoft and a risky one by IBM But if history repeats itself Microsoft s not as good as it could be but at least it s a step forward approach will win rather than IBM s heres the solution to all your prob lems just drop all current ways of doing things approach Don t get me wrong l d like to see IBM s ap proach win But think Microsoft s will win Tools environments and agents Let s get back to the subject The purpose of traditional user interface design is to build a link between two static objects a computer and a user The purpose of user interac tion design is to build 1 tools and 2 an environment to ease and en hance the interaction among 3 two or more actors or agents Let s now look at each component in more de tail in reverse order 3 An actor or agent might be a g hae opes cte a loe no mb aibedg ew y I 4 om d Bo l ai A i tr 4 en Tektronix gives you an entire bench of affordable test instruments
330. ty engineering that the process oriented point of view has started to attract serious attention In the commercial world the shift is beginning to manifest itself with a shift away from the func tional paradigm toward something else for which there is as yet no fully developed example The DOS version of the number one selling word processor Word Perfect is a prime example of the functional point of view WordPer fect has scores and scores of func tions which despite their individual utility lack an overarching unifying principle or Gestalt With Gestalt all those features and functions would come to have meaning to stand out as clearly as the Empire otate Building does in the New York City skyline have no example of a software product of any complexity that ex hibits a fully developed Gestalt of the type have discussed But here is how you might recognize one First is the obviousness of its use given a basic understanding of the overall Gestalt Second is the ele gance of its design which in prac tical terms means discernible pattern in the way functions are grouped and presented Third is Scope consistency or consistency at various levels of design low mid dle and high The opposite of scope consistency is a huge catchall of features Command line oriented operat ing system shells are interesting to discuss from this perspective The Unix C shell and the DOS COMMAND COM are two prime exam pl
331. uilding and Testing Your Own Speaker System WITH ROJECTS Daria tees ki fetan 4283P 16 95 3374P 16 95 As a member of the Electronics Book Club you ll enjoy receiving Club bulletins every 3 4 weeks containing exciting offers on the latest books in the field at savings of up to 509 off of regular publishers prices If you want the Main Selection do nothing and it wii be shipped automatically If you want another book or no book at all simply return the reply form to us by the date specified You ll have at least 10 Cays to decide If you ever receive a book you don t want due to late delivery of the News you can return it at our expense And you ll be eligible for FREE BOOKS through our Bonus Book Program Your only obligation is to purchase 3 more books during the next 12 months after which you may cancel your membership at any time A shipping handling charge and sales tax will be added to el orders All books are softcover unless otherwise noted If you setect a book that counts as 2 choices write the Dook number in one box and XX in the next If you select a Counts as 3 choice write the book number in one box and XXX in the next 2 boxes Publishers Prices Shown 1995 EBC If coupon is missing write ta Electronics Book Club Blue Ridge Summit PA 17294 3810 3802H XXX 84 95 Hardcover Counts as 3 0443017 XX 40 00 Counts as 2 Hardcover den eae se ka pO 2790P 17 95 Amplifiers _ Waveform Ge
332. uits and muca more PLUS equipment troubleshooting techniques circuit design reports on new technology and products equipment test reports in depth coverage on computers videc audio vintage radio and lots more exciting features and articles Basic sub rate 1 yr 19 97 2 yrs 38 97 SAVE 26 03 OR EVEN 52 06 For each gift of Electronics Now you give this Christmas you save a full 26 03 off the newsstand price And as a gift donor you re entitled to start or extend your own subscription at the same Special Holiday Gift Rate you save an additional 26 03 No need to send money if you prefer well hold the bill till January 1995 But you must rush the attached Gift Certificate to us to allow time to process your order and send a handsome gift announcement card signed with your name in time for Christmas So do it now take just a moment to fill in the names of a friend or two and mail the Gift Certificate to us in its attached postage paid reply envelope That s all it a takes to plug your friends into a whole year MESSI of exciting projects and new ideas in Electronics Now Electronics Now January 1995 Control eight channels of 120 volt AC with a 68705 RICHARD L ROANE HAVE YOU EVER WANTED TO VARY the power delivered to a 120 volt AC load under software control In this project a 68705 micro controller will do just that Spe cifically it can con
333. ular GE s 20 75 watt and Abco s 16 60 watt tubes My test results suggest that intermittent interference is more likely to be caused by har monic frequencies in the in frared region This is supported by my test of the two eight inch circular fluorescent lamps The reduced total harmonic distor tion version did not interfere with the stereo however both lamps interrupted the cable box I prefer electronically bal lasted lamps because they offer instant starting and lighter weight However most of the tubes I tested were heavier and took up more space than the in candescent bulbs they replaced The one exception is Abcos ta ble lamp conversion set A table THE OUTPUT OF THIS remote control was swamped by an energy efficient fluorescent tube lamp with this tube is not top heavy because the ballast is lo cated in a small box that plugs into a power line wall outlet It has a socket for the lamps line cord This arrangement permits a circuler compact fluorescent light to fit easily around the lamps shade supporting harp which is too small to accommo date most of the other energy saving fluorescent tubes with screw type bases If you decide to buy an elec tronically ballasted lamp look for one that has a label stating that it has reduced total har monic distortion It will pro duce far fewer annoying fre quencies My favorites are a 22 watt tube from Lights of Amer ica and a 20 watt tube
334. undamentally an incandescent bulb with a more or less ordinary tungsten filament The only difference between them is that the halogen lamp is run much hotter for higher efficiency The quartz bulb is more resistant to heat shock than ordinary glass Some wondrously magic chemistry known as the halogen cycle presumably makes the filament last longer Tungsten readily forms com pounds with halogen gases such as chlorine and fluorine examples are tungsten hexachloride or tungsten hexaflouride These gases are sta ble at lower temperatures but dis sociate at very high temperatures Now one big shortcomming of high temperature filament life is that the tungsten literally boils off This both weakens the filament and blackens the glass leading to early lamp failure Here is how the halogen cycle works Near the hot filament ejected tungsten mixes with the dis sociated halogen Away from the hot filament the two substances merge to form a stable halide gas When the lamp is turned off much of the dissociated tungsten re deposits back on the filament Nor mally there is little opportunity for bulb darkening However there are two important rules for quartz halide lamps Never touch them and Always cool them EARN YOUR B S E E DEGREE THROUGH HOME STUDY Our New and Highly Effective Advanced Place ment Program for experienced Electronic Tech nicians grants credit for previous Schooling and Professional Exper
335. urce code BXA 51 and TB QComm The BXA 51 assembler can be used for making library changes or other assembly language pro gramming TB QComm is a communications utility that allows you to load HEX files and load edit or save BASIC programs SUPPORT PERIPHERALS To complete your projects we offer various peripherals including a customizable 4x4 key pad dot matrix LCD modules X 10 power line modules pressure temperature and humidity sensors screw terminal interface boards etc For more information on Xplor PDCs or our many other Creative Microcontroller Solutions call today for our free 28 page catalog S BLUE EARTH RESEARCH Wi 165 West Lind Ct Mankato MN 56001 Voice 507 387 4001 FAX 507 387 4008 BBS 507 387 4007 g MON S21u01 29 3 GEE Menuer 103 Electronics Now January 1995 Remember War of the World Objects float in in air and move to the touch Defies gravity amazing gift conversation piece magic trick or great science project ANTIK Easy to Assemble Kit Plans DANGER INVISIBLE LASER RADIATION AVOID EYE OR SKIN JO DIRECT OR SCATTER RADIATION CLASS WV LASER PRODUCT Advanced project produces a burst of light energy capable of burning holes in most materials Hand held device uses rechargeable batteries 500 joules of flash energy excite either a neodynium glass yag or other suitable 3 laser rod This is a dangerous CLASS IV project individual
336. uring the Winter Consumer Elec tronics Show January 8 Denver January 12 San Diego January 19 and New Orleans January 26 The tests will be held in Dallas Fort Worth on February 2 Fresno on February 9 St Louis on Febru ary 16 and Pittsburgh on February 23 In March tests will be admin istered in Omaha March 2 White Plains NY March 9 Minneapolis March 16 and Madison WI March 23 Registration deadlines are two weeks before the test dates For more information on test locations study guides and cost contact MOBILE ELECTRONICS CER TIFICATION PROGRAM 2512 Artesia Boulevard Redondo Beach CA 90278 Phone 310 376 8458 Fax 310 798 4598 TRANSFORMER TEST just received the November 1994 issue of Electronics Now As usual found most of the material quite interesting especially The TextGrabber The Frequency Doubler the Tesla coil article and All About Phase Locked Loops However have five comments on Simple Test for Transformers First the value of the transformer secondary voltage was given as 6 8 volts twice in the text and once on the circuit diagram The standard voltage for transformers is 6 3 volts and multiples of that value e g 12 6 and 25 2 The 6 8 value is a standard for resistor ohms Second 6 3 volt transformers might be hard to find Mouser Elec tronics lists several Any trans former voltage near 6 volts can be used I found a 5 6 volt unit tha
337. use PDCs to sharpen their programming skills while developing original concepts Just identify a need and hit the accelerator Embedded Control Simple Robotics PC Peripherals Monitoring Systems Data Logging Xplor PDCs will take you to the far reaches of your imagination doy s8995 e 80C32 CPU with 12 digital 1 0 lines I 64K bit EEPROM for Cleats CES Celeste s e O socket block for Also available with transistors resistors etc 11 channel 10 bit A D converter Xplor 32ca e Screw terminal block and project case Built in BASIC Language Powerful Utilities and Library Functions Make Programming Easy The example below shows how easy it is to wire up and program the Xplor 32c for a simple on off controller application The built in software gives you the power to write programs like this in just minutes Your program is stored in nonvolatile memory and will automatically execute when power is applied BLUE EARTH RESEARCH HUMIDITY CONTROLLER TIME 12 34 56 ACTUAL RH 76 SETPOINT RH 75 64K BITS 8K BYTES HUMIDITY SENSOR ee ov W s MEMORY sv AOJ GND D4 95 D6 D7 RS GUN IE 19 TINY BASIC PE K UTILITIES 1 E LIBRARIES ese W T CODE DATA 5V CONTRAS 31 8 AST Af E i 2 lo tc M i A o 9V i1 m E CI C2 C3 Ca R EIR x Bc ee SLE oer RELAY OUTPUT ui PC COMM PORT Xplore eo CALL 8132 LIBRARY FUNC Initialize LCD ALL YOU NEED 20 ONTIME 200
338. v Spark X sec min The first part of the expression is related to the number available at the output of the circuit the second part is related to the size of the engine and the last part is just stan dard conversion If you simplify the expression and use N as the number of sparks per revolution for a particular engine you wind up with a description of the arithmetic that you have to do RPM circuit count x 20 N There are two arithmetic opera tions to perform One is to multiply the count delivered at the multipiex ed output bus of the 4508s by 20 60 seconds 3 seconds of sparks and the other is to divide the spark count by a factor dependent on the size of the engine There are many ways to do this a bit of forethought can help you find the easiest If you were to do the multiplica tion first you would have to deal with some awkwardly large num bers For example a 12 cylinder en gine running at 6000 rpm produces 1800 sparks per second Multiply ing that by 20 means you ll need a circuit that can handle 36 000 deci mal thats 1000 1100 1010 0000 binary Sixteen data bits are difficult to deal with The numbers that you have to work with will be much more man ageable if the division is done first The question is where should the division be done Doing it after the 4508s might seem logical but it would require too much extra cir Cuitry An easy place to do the divi sion is right on the clock line
339. vailable to you with a toll free call What a way to earn an education Aworid of opportunity Where is your career headed With a four year bachelor s deg ee from World College you cal the shots choosing from incredible high paying o portunities in electronics tele communications computer elestrical power and many other growing fields World College gives you the skills the knowledge the power to take advantage of your best opportunity in electronics And you can do it all at your own pace Without leaving home World College continually works to provide its students with the most advanced education tools From the latest equipment and reference books to breakthrough computer simulated experiments students are exposed to the latesttechnologica advancements All the equipment parts and soft ware you need re included in your affordable tuition including more than 300 hands on lab experiments you can complete in your home Choose your own pace Earn your bachelor s degree on your time and at your pace because you pay tuition to World College only as you complete the upper level semesters close to graduation The faster you make it through the less you pay So you have an incentive to make your future happen quickly yet the freedom to choose your own pace Send today for your FREE course catalog and give yourself that future you ve always wanted with an electronics degree educa
340. ved from its host circuit The passive tester described here can test ICs in a circuit and does not need to be recon figured for each device to be tested A passive tester can also function as a logic analyzer to monitor input and produce out put signals This article describes how to design build and use a simple inexpensive passive IC tester that can be a vaiuable addition to your suite of test equipment But keep in mind that the tester is designed for testing TTL and CMOS devices powered by 5 volts only The tester can test devices with any number of pins The author designed his prototype to test ICs with up to 20 pins Chips with 8 te 20 pins that are packaged in DIPs dual in line packages usually have the same width and pin spacing Thus if a zero insertion force ZIF socket is added to the in tergrated circuit tester it will be able to accept most 8 14 16 18 and 20 pin ICs The IC tester puts one or more pins of a known good device in parallel with the corresponding pins of a suspect device The tester then lights one LED lamp if differences are found in the signals between any matching pins and other LEDs on tne tester light up to show where those differences are Circuit design A typical input circuit is shown at left in the Fig 1 sche matic one is needed for each test pin Only one input circuit is shown It can test only one suspect pin at a time bu the tester can be built with as
341. vrms noise and ripple I Four digital meters for voit and current display Short circuit and overtoad protected ae Excelent regutation and low ripple PS 8200 with digital volttmeter 179 00 P rs p A d B Short circuit and overload protected Also available 30V 5A 60V 3A 60V 5A a F Also available 30V 5A triple output 549 95 16V 10A 30V 10A Dual tracking 30V 3A 30V 5A 60V 3A 60V 5A RF SIGNAL AUDIO GENERATOR FUNCTION GENERATOR GENERATOR AG 2601A 119 00 raa MA p 169 95 Ind rinde i in 7 ranges SG 4160B 1 19 00 oed in ples ead coven eres pulls and ramp 100 kHz 150MHz sinewave in 6 0 10Vp p squarewave Output 5mV 20Vp p ranges Synchronization 3 of oscillation 1 distortion DC offset 10v AM modulation 0 05 S00Hz 5OkHz FUNCTION GEN COUNTER Audio output 1 kHz 1 Vrms 05 5OHz S00kHz FG 2102AD 229 95 Output impedance 600 ohm Generates signal same as FG 2100A Frequency counter 4 digits RF SIGNAL AUDIO Feature TTL and CMOS output GEN COUNTER GEN COUNTER SWEEP FUNCTION SG 4162 AD 229 95 AG 2603AD 229 95 GEN COUNTER 329 95 ee Genres audio tunt came pe Sweap Linear 16 Mog 20ms to 2s SG 4180B AG 28014A AM Modulati Frequency counter 1Hz 150 MHz Frequency counter 1Hz 150MHz Gated te MM Control Generator for interna and extemal source for internal and external sources Generator Control Voltage amp 6 digit counter Sensitivity lt SOmv Sensitivity lt SOmV 1Hz 10MHz for
342. was seen by hun dreds of thousands of cable sub scribers in the East and Excerpted from the forthcomi ng book Designer Counterfeiting Midwest during an HBO cablecast of the movie The Falcon and the Snowman Good Evening HBO from Cap tain Midnight 12 95 a month No way Showtime The Movie Channel Beware The sender who used a satel lite uplink to superimpose his message on the HBO transmis sion was eventually caught and prosecuted But his sent ments regarding the rising cost for premium cable television and signal scrambling are shared 9y many 4 In January 1986 HBO and Cinemax both owned by Time Inc became the first two cable programmers to scramble their satellite signals thereby pre venting people who owned satel lite TV reception or TVRO systems from watching their programming without paying a monthly sub O scription fee T A Electronics Now January 1995 In May 1986 little more than a week after Captain Midnight s pirate broadcast Showtime and the Movie Channel followed suit and scrambled their signals To day virtually all of the major ca ble networks scramble their satellite feeds Despite signal scrambling and a significant enforcement effort by the cable industry and the Motion Picture Association of America MPAA to ap prehend illegal users signal theft remains rampant Accord ing to the National Cable Televi sion Asso
343. witch setting to the application selection power up routine 45V MIC J 3 RI 1K 22 45V R3 100K liti SOUND MODE ROUTINE LDA 05 STA DDRA BSET 2 PORTA CLRA LDX 08 BCLR 2 PORTA BSET 0 PORTA BRSET 1 PORTA COLLECT ROLA BCLR O PORTA DECX BNE LOOPAD BSET 2 PORTA CMP 30 BHI ADADJUST STA SDDATA BSR APPSD BRA STARTAD LDA 30 BRA STORESD LDA SDDATA STA PwRCO STA PWRC STA PWRC2 STA PWRC3 STA PWRC4 STA PWRCS STA PWRC STA PWRC7 RTS 45V wv JL dtid uiu v Ul PETS FIG 3 COMPLETED UNIT The circuit board has 120 volt AC signals on it so check and double check your work before plugging in and testing tine reads Port C and selects the corresponding application Note that following power up Port C can be used for other pur poses Table 2 lists Port C val ues along with the correspond ing routines and PC board jumper settings In general if no host is connected and Port A will input data from S1 set the jumpers as shown for applica tion O manual Also note that in the design once a routine has been selected the only way to change to a new routine is to reset the system Following is a description of each application Manual The software scans Port A waiting for a bit to go low When that occurs the micro controller loads power level data from Port C and stores it in the power control byte specified by the value in Port A For example placing 05 on
344. yists Astarita said We encounter people who have Ph D s and others who have ex tensive backgrounds and de grees in many other academic disciplines Astarita who is a former FBI agent heads a staff of former law enforcement professionals He and his staff conduct buy Mn j ad uH T o Willi T RAU LT Faya Rae i ola THIS SPORTS BAR in New defscy was sued for 1 4 million D Major League Baseball for showing out of town games without autorization and bust operations and gather information to be used against pirate operations as part of their daily jobs Cable signal theft can mean more than lost revenue to cable companies One of the most se rious problems caused by the proliferation of pirate electronic equipment is signal leakage Hooking up an illegal decoder requires some technical exper tise and the proper tools A de coder that is not properly installed will cause signal leak age radiation that poses a threat by interfering with com mercial aircraft radio frequen cies We re supposed to be a closed system and there should be no leakage said Hack The FCC does flyovers and measures the signal leakage if the amount exceeds the cumulative leakage index CLI we will be fined heavily Most cable operators have CLI teams who seek out potential signal leakage throughout the cable system Cable fights back The technological battle be tween the cable companies and the pi
345. ze set up ff use maintain troubleshool and repair them How to tect them from mistakes sabotage prying eyes and sticky Betas on now bey wore and dozens ol eneciive ways fingers How to recover damaged and lost files How to of defeating Caller ID ANI 69 57 and Call Blocking prevent crashes includes software reviews Loaded Mi BYICE MANUAL nfo advice tips 29 Maintain adjust align troubleshoot repair floppies with out special equipment of software 3 575 258 PCx86 MAC Apple Atari Commodore etc systems All floppies need some upkeep 29 DIS E TUIO RIAL Theory practical facts on floppy drives disks In cluding many tips recommendations formatting inter facing FOC etc 24 Any 2 49 All 3 69 and 67 Also describes Caller ID Oa Beige Cheese and CF Boxes ESS SS7 E 911 various CLASS services CNA NON PUB OA CAMA DNR 800 ECR Diverters LD Extenders Centrex more 29 PHONE COLOR BOXES BAS designed b none coior Ooxes described Dozens of circults simulator programs Plus call forwarding conferencing phreak history 50 useful jand legal phone circuit plans more 29 ROBOFONE AUTODIALER Powerful versatile menu arven Wargames autodi Baler lets you dial any quantity up to 10K or mix of locaY long distance numbers in any order over any length of t

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