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SUBSTITUTE PLAYS - American Radio History

1. iii aaa cash TOR SUB MINIATURE 8 BA SPEAKER SPECIAL PRICE CASSETTE PC style 2 00 each D TYPE C T S Model 883079 5 00 each DUAL L E D DISPLAYS SHSUSASM ONNECTORS 8 ohms coi MECHANISM ee 3 0 oz ferrite magnet CASE OF MT e A 22 44 EDGE CONNECTOR en Typical response range 8 SPEAKERS pt So yA solder lug 2 50 each 100 10 000 nz 32 00 Try ung styte Power rating 15 watts max Drilled 10 mount line 560 high 7 segment L E D read 28 56 EDGE CONNECTOR DB 15 PLUG 2 75 matching transformers outs Mount in 24 pin DIP PC style 2 50 each DB 15 SOCKET 4 00 sockets DB 15 M 10 for 22 00 sg arid Spite LINE CORDS MAN 6640 orange c c 75 each co ECTOR DB 25 SOCKET 3 50 FND 5148 red c c 75 each 36 72 EDGE NNECT DB 25 HOOD 1 25 PC style 3 00 each EL ps ce 5 AMP SOLID STATE 01527 reo c a TASSAS ier TWO WIRE lt 3 V2 SPEAKER 43 86 EDGE CONNECTOR PRINTER Heinemann Electric ges f CONNECTORS 6 18 2 SPT 1fiat 310r 1 00 3 101 5A 140 5AMP a n t 9 sue Bohm PC style 4 50 each CONTROL 3 32 vdc A impedance 6 18 2 SPT 2 flat LOAD 140vac 5amp 7 on Full range Suc 6 16 2SJ d 125 a AN Bozma INU 16 2 SJT roun 25 each Y Rowe allel data cables aem i 5 00 each 10
2. SS 6116P 4 200ns SRAM 3 49 7 29 AN i ae e R E te 68764 450ns 25V EPROM 1 2 95 lemguage translations etc The DT 1050 is a standard DIGITALKER kit encoded with 137 separate SN7413N u E 4 it and usei words 2 lones and 5 different silence durations The words and tones have been EUN n A EN y P STER 3 61 1 6LP 4 200ns LP SRAM 3 69 68766 350ns 25V EPROM 1 4 05 assigned discrete addresses making it possible to output single words or words concatenated SN7416N u 49 SN7494N P SNMUTAN M T9 into phrases or even sentences The voce output of the DT1050 ts a highly intelligible male SN7417N u 59 SN7495N i 49 SNI4179N 16 148 voice The DT1OSO consists af a Speech Prscessor Chip MM54104 40 pin and two 2 Speech ROMs EUM uox A B s SAU Ow 149 M iC RO p ROC E SSO R Co M o O N E NTS MMS21645SR1 ind MM52164SSA2 24 pun along with Master Word list and a recommended schemabc SN7421N 1 59 SN7497N 06 3
3. Cherry elect E 21 N O or N C CLEAR CLIPLITE mms i Sind Spl Designed to provide a steady 5 0 1A contacts Suitable for alarms LED HOLDER gens proe p ihdas vdc 240 ma from a battery and other low energy circuits Make LED a f di screws 2 X 12 X 1 2 supply of 3 5 to 6 25 volts Spectra strip red marker strip 1 fever iei ui CIR uu Ja 795 wack 1 00 EACH Pal pases ta Vera ty LY 28 ga Stranded wire ek j man j s 5 00 per 100 roll 45 EACH 10 FOR 4 20 contains 6 single pole normally 1 50 each 4 for 1 00 2 LL ELECTRONICS CORP Bm TOLL FREE ORDERS ONLY QUANTITIES LIMITED LOS ANGELES CA STORE P O BOX 20406 f 1 800 826 5432 MINIMUM ORDER 10 00 METAL OXIDE tls thas Salah Los Angeles GAB388D6 ORDER ONLY USA 3 00 SHIPPING VARISTOR 213 380 8000 See N CALIFORNIA 1 800 258 6666 FOREIGN ORDERS VAN NUYS CA STORE TWX 5101010163 ALL ELECTRONIC Macs Ty sm EE SUFFICIENT Popular GE JS0LATOA i 1 h open Switches Measures 4 4 long CIRCLE 55 ON FREE INFORMATION CARD ADVERTISERS INDEX RS Page 121 Active Components 21 55 All Electronics Corp 93 94 AMC S3lelunuu addo wiped 0606 bla vs 71 ARCsoft Publishers 69 158 B amp K Precision 61 5 Cleveland Institute of Elec 33 26 Communications Electronics 5 Computel ss aae vv etrEpEE an ee 94 127 Consolidated Electron
4. list and some exceed this price less discount Remote units are the most costly in any maker s line Here are some representa tive suggested retail prices of detectors on the market BEL Tronics MicroEye 841 190 Cincinnati Microwave s OA ss cela AA dem bae di 245 Controlonics Whistler See i Sret auem 300 Dynascan s Cobra RD 4100 200 Electrolert s Fuzzbuster XK 160 Fox XKMR Motorcycle 200 K 40 s Remote 340 Radio Shack s Road Patrol XK 180 Regency s RS Five L1 sul 149 Uniden s Bandit 55 190 You pay more for really compact units which use the latest microminiaturization one manufacturer has even designed a detector with a contoured housing that allows it to fit between the for ward part of a dashboard and the windshield glass so it will be as in conspicuous as possible Along with the proliferation of vi sor mount detectors we re seeing on the market the remote type radar detector has also realized a substan tial following These units typically utilize a weatherproof radar detector that is mounted behind any plastic Radar Detector Buying Guide techniques They offer the benefit of tak ing up less space in an automobile and can be easily removed and stowed away to avoid the prying eyes of thieves The con trol heads of remotes are exquisitely small For
5. Silicon Valley a term applied only 15 years ago to a sleepy orchard laden area of north ern California the Santa Clara Val ley Located about 30 miles south of San Francisco near Stanford Uni versity the seeds were planted by es tablishment of the first semiconduc tor company on the West Coast by transistor co developer William Shockley The year was 1955 only 30 years ago High technology compa triots followed quickly and the area became a glamour spot for silicon based companies Forrest Mims in his new book Siliconnections published by the McGraw Hill Book Company is a personalized coming of silicon age story Starting with his first awaken D H Edward Roberts reviews a MITS cal culator schematic in 1974 a few months prior to designing the Altair computer Photo by Forrest M Mims III ing upon seeing a photograph of a transistor in 1954 He details his extraordinary ex periences related to the silicon tech nology through three decades of ex citing involvement with it Given his wide ranging brushes with the world of silicon he might well have titled his book Siliconescapades In this book for example he re lates how he met Ed Roberts and joined business forces with him the origins of their company MITS which later introduced the Altair 8800 computer that spearheaded the personal computer revolution in 1975 and how they split up ami cably with a payou
6. Continued on page 84 gt erage All are with K 2 in orbit at a nominal 77 west longitude assignment 30 MODERN ELECTRONICS November 1985 MEN A X M C C E ALL EXPAND YOUR CAREER HORIZONS eet aor 9 9 LAAR e s sse ren A T A ra e t e El s LLLA A one et pea ae A OOO ny ARA gant NSRS a T obe in oer oc ess08 139 m micho m The CIE Microprocessor Train2r helps you to learn how circuits with microprocessors functio 7 in computers START WITH CIE the handy reply zou pon or card below to C eveland Institute cf Electronics Microprocessor Technology Satellite Coram nications 1776 East 17th Street Cleveland Ohio 44114 Robotics Wherever you want to go in electronics Associate in Applied Science Degree in Electronics Let us get you started today Just call toll free 1 800 361 2155 in Ohio 1 800 362 2105 or mail in Check box for G I Bill bulletin on Educational Benefits O Veteran O Active Duty MAIL TODAY Start first with CIE e T Mosa T Why CIE Because we re the leader 17 teaching Cleveland Institute of Electronics electronics through independent study Conzider this 1776 East 17th St Cleveland Ohio 44114 We teach over 25 000 students from all over the United States and in Over 70 foreign count es And Please send your free independent study catalog we
7. G 9 Be SPEAKER CATALOGO MO Y 1001 bargains in electronics Save up to 50 call toll free 1 800 346 2433 for ordering only Order by VISA MC AMX No COD s Missouri Alaska Hawaii call 1 816 842 5092 or write McGee Radio 1901 McGee St K C MO 64108 Postage for catalog 1 00 Mn uc fd e E e E e E e E amp AWII TOOLKITS Eight Diskette sides crammed full of APPLEWRITER goodies patches sourcecode microjustify proportional space disassembly script an swers self prompting glossaries bonus book bunches more 39 50 for either DOS 3 3e or ProDOS 2 0 versions SYNERGETICS Box 809 ME Thatcher AZ 85552 VISA MC 602 428 4074 APPLE OWNERS Hard sided carrying cases for Macintosh 100 Macintosh and external drive 130 and IIc 100 Send check or money order or MC Visa accepted Justin Case Manufacturing Corp 334 Main Street Port Washington NY 11050 or telephone 516 883 2299 MacPAINT PRINTED CIRCUIT LAY OUT PACKAGE Kiss tape and dots goodbye forever Faster much more accurate cheaper far more fun New Don Lancaster package gives you professional results every time Diskette and bonus book only 23 50 SYN ERGETICS Box 809 ME Thatcher AZ 85552 VISA MC 602 428 4073 ELECTRONICS ELECTRONIC CATALOG Over 4 500 items Parts amp components Everything need ed by the hobbyist or technician 2 00 post age amp handling U S Only refundable with first 15 00 or
8. THEN x Provided the green normal light is lit the Mark III will safely power up the TV set so that you can look for open circuits by examining the picture on the CRT Circumvents all start up and horiz drive related shut down circuits APPLICATIONS The Mark IIl will analyze the horiz flyback hi voltage scan derived B sources yoke pin cushion HV multiplier cir cuits in any TV set that employs either an NPN transistor or a single SCR for its horiz output device This applies to any age any model any chassis any brand including Sony In brief the test function scans for shorts the run function permits you to observe any open circuits via the Symptoms that ap pear in the CRT screen HOOK UP Simply remove the set s horiz output device and replace it witn the scanner s interface plug No wires to disconnect no other connections required not even a ground connection MISTAKE PROOF No damage will result if an error is made during hook up The scanner simply won t turn on until the error is corrected uc AT THE PUSH OF ds JUST ONE BUTTON RED OPEN LIGHT means the emitter circuit of the horiz output stage is open no ground path YELLOW SHORT LIGHT means the flyback primary HV multiplier vertical output horiz driver and R B G color output stages are not shorted Instead a circuit that normally draws a small amount of cur rent is shorted i e the tuner IF AGC video chroma matrix
9. These two new birds will join five oth er lower frequency 4 6 GHz C band RCA satellites that are already provid ing government and commercial com munications throughout the U S Ser vices of the K 4000 Series will include broadcast and syndication master an tenna systems direct to home broad casting and private voice voice data and teleconferencing for business and government TDMC PRE EMPHASIS ARRAY 99MHz NTSC ELLIPTIC PRE EMPHASIS FILTER ARRAY 6 MHz ELLIPTIC FILTER Fig 1 Block diagram compares B N TSC system readied by RCA upper por tion with Britain s B MAC system lower portion currently in operation chroma luminance frequency inter leaving without contamination of ei ther color or picture B NTSC Processing By processing a total NTSC band width of 4 2 MHz and stripping sync RCA s K Series Ku Band Satellites Certainly the most powerful satellites now in domestic service 16 45 watt transponders on each satellite will be of fered to participants in RCA Ameri com s syndication system in a no cost free antenna receiver package The only charge will be 1000 to defray in stallation as long as the 3 7 meter Ku band antenna is pointed at a K Series satellite Signal to noise ratios for a sin gle video transponder using this equip ment is specified at 55 5 dB and 50 dB for two over most of the country under clear sky conditions Ground station installa
10. receiver Although RCA concedes MAC al lows slightly more overdeviation and a ue D E LA c CS a bit more impulse noise engineers TTN L7 Zn NIS E believe that MAC has poorer lumin a ance S N NTSC uses standard ip CCIR video preemphasis rather d A than MAC s fixed 3 dB The two au VEIA do d fore dio systems Dolby delta modulation P if and pulse code modulation are dif X ferent but both begin to fail at carri er to noise C N ratios of 6 to 7 dB In a consumer product RCA claims that hard video scrambling is impractical and unnecessary but audio scrambling becomes essential along with secure encryption control of coded signals and subscriber turn on and turn off keys Though MAC eliminates both cross color and cross luminance from NTSC it also re quires linear RGB inputs into any TV receiver few receivers have this capa bility Later of course the NTSC system will eliminate two problems with frame comb decoders and pro gressive scan will remove any occa sional flicker or line crawl Motion adaptive progressive scan and frame comb filters will physically supplant the single line comb filters used to M M Fig 2 This series of diagrams illustrates reception footprints possible with the new RCA Ku band K Series satellites Top diagram shows eastern U S cov erage center diagram western U S coverage and bottom diagram CONUS cov
11. 2 g FSRSBSBRUB IP DS ARIAL t uo luo a wW NN e OW WNW NN NEE Wm ow ASSORTMENT OF 15 POPULAR CAPACITORS 2258 3 It ha i d J ND following the part number After wring your order total all of the discountable items and apply the appropriate discount To this ded Sod he phe bere be vin en be SE RVICE CHARGES VO LU ME DISCOU NT charge We pay all shipping and insurance to addresses in the U S A Canada and Mexico when check 0r money order accompanies order Digi Key only ships orders within the continentat U S Alaska Add 2 00 0 00 8 99 99 NET Hawai Canada and Mexico Add 0 75 100 00 249 99 Less 10 WHEN OADERING BY PHONE CALL 1 800 344 4539 AK cail 218 691 6674 BY MAIL SEND YOUR ORDER TO OIGI KEY P O Box 677 Thief River falls MM 56701 Add 0 50 You may pay by check money order Master Charge VISA or C O D DIGI KEY GUARANTEE Any parts or products purchased from Digi Key that prove to be defective will be repiaced or refund Add 0 25 600 00 999 98 Less 20 ed if returned within 90 days from receipt with a copy of yourinvoic No Charge THE MARK Ili HV CIRCUIT SCANNER Checks the horiz output circuit for open shorts Checks the flyback yoke PC and HV mult Checks all scan derived B sources Checks all circuits that rely on scan derived B voltage Checks for open safety capacitor Checks the emitter circuit of the horiz output
12. 40 kHzto 1 MHz 400 mV 100 to 130 V ac 12 W rms up to operate between 20 and 50 mV division to be able to view all traces at one time To this end we had to ad just the Model 8001 s MULTIPLEXER GAIN as we went along From the foregoing it should be obvious that initial setups can bea bit tricky in order to avoid exceeding normal operating parameters Furth ermore the scope must be switched to the ac mode since the Multiplexer outputs a dc component that will move small amplitude traces off the screen if it is permitted to get into the scope s inputs Too it would be nice if your scope s amplifier inverts so that the reference triggers can appear either at the top or the bottom of the screen display Other than the fore going cautions operation of the Model 8001 was relatively simple Laboratory Tests On our testbench the first thing we did was simulate an A D converter that we used to check the steps for overshoot preshoot and nonlineari ty components Using this arrange ment we noted a small amount of turn up at the beginning of each step Fig 1 which is probably more the result of the ac coupling in the scope than to any design deficiency in the Multiplexer Significantly we ob served no other overshoot compon ents Linearity risetime and the ab sence of trace roundings all tested out satisfactorily Our next test was devised to check risetimes and falltimes and thus gave us a bandpass result as
13. 895 SNTA72N M 39 SN74156N 16 59 SN74390N 16 148 500 6800 68000 SERIES 530 2 256x4 4500 CMOS 2e 72 506 Z4 4Func CMOS Stopwatch CKT SN7473N M 39 SN74157N 36 4 6502 40 MPU wath Clock 1MHz 495 1 me T215EV Kut 4 4Func Stopwatch Chip XTL Fvaluation Kit 9 SN74393N M 149 MM5257 18 4096x 450ns 4044 495 6502A 40 MPU with Clock 2MH2 5 25 HMBI16P 2 24 2048x8 120ns CMOS a95 7216A 28 8 Digit Univ Counter CA MIS2M 20 129 6502B 40 MPU with Clock 3f 7 95 HM6TISLP 2 24 2048x8 1200s L P CMOS 649 72160 28 8 Dgn Freq Counter QC 76945 m v9 6520 AQ Penpheral Inlet Adapter 275 HM6116P 3 24 2048xB 1500s CMOS 3 75 7217 28 4 Digit LED Up Down Counter C A 745132 la B5 748251 l6 5 6522 40 Versatile Inter Adapter 4 95 HMB 16L 3 24 2048xB 1500s LP CMOS 395 72 74h 28 4Diot LEO Up Down Counter C C EU 4 ot ss 4 BN nas y sg 800 d nem No cli 695 Mende 24 20488 200P CP CMOS 369 raw aa S Functon Counts Chop xt Evaluation X i 7 5 s HM6264P 12 78 8192x8 120ns CMOS 7 25 7T S05 M 35 74518 o 59 745258 Ww 59 29 40 MPU win Clock and RAM 595 MDGALP 12 28 81958 1200s LP CMOS 75 30009 1983 INTERSIL Data Book 1356p 9 951 ase u R rasm wo sa mso u sog a m GUC Reon ceon Dp meos m ones os O 4L 145 16 HM6264 P 1 192x8 t50ns LP CI 4 7ASQB Mo 35 nu zm oo u zs 68809E 40 CPU amp Bit Ext Clocking 2MHz 11 4
14. E ELECTRONICS NOTEBOOK i Pressure Sensitive Resistors By Forrest M Mims III There are many applications for pressure sensitive resistors For example a pres sure sensitive resistor can serve as the transducer for an electronic scale or an accelerometer When connected to an ap propriate circuit a PSR from here on ward I will use PSR interchangeably with pressure sensitive resistor can provide a warning when an object placed on it is moved PSRs can also be used in various kinds of keyboards and computer graphic input devices I first wrote about pressure sensitive resistors in the November 1982 issue of Computers amp Electronics magazine A few years later that magazine published a letter from Scott Allner who suggested yet another application for these versatile devices Mr Allner wrote that he worked for an institution for severely mentally re tarded and physically handicapped peo ple many of whom spend their days in wheelchairs To protect these patients from receiving bed sores Mr Allner wrote specially designed cushions are necessary Therefore he was working on a special cushion fitted with an array of 260 pressure sensitive resistors Mr All ner s objective is to obtain a visual repre sentation LED array or computer screen of the weight distribution of vari ous patients seated on the test cushion The sensors about which Mr Allner wrote were do it yourself devices
15. from page 4 office With mail being involved the Postal Inspector can be brought into the act There are five regional offices in the country that handle this Contact your local Postal Inspector for directions Again violators of the FTC Rule are minuscule in number compared to the thousands of mail order sellers who op erate to the full satisfaction of buyers I ve never had a problem with an order I placed by mail for example and have often been pleasantly astonished at the re sponsiveness of the people in this in dustry Nonetheless I did get some read er phone calls with complaints about a former advertiser Pinecom Interna tional in California whose phone was disconnected I was told Tracking them down I was advised that either all orders paid were filled or that payments such as checks were not deposited Should any one have a problem here please write to me and we ll follow through on this as best as we can Thanks p lih dalekog divisions is possible provided of course such frequencies are related In the television department both up down channel selection and re mote control commands were exam ined on an older RCA CTC 92C TV receiver with somewhat mixed re sults In Fig 5 clock frequencies and waveform levels such as channels audio etc were plainly evident but not overwhelming Morerecent mod els and their bit streams may prove to be somewhat more photogenic How ever all
16. sure sensitive resistors are available For instance Vernitech 300 Marcus Blvd Deer Park NY 11729 makes a potentio meter type PSR that incorporates an in finite resolution potentiometer This de vice offers a linearity of within 0 3 Also available are various kinds of elec tromagnetic and piezoelectric pressure sensitive resistors For information about manufacturers see one of the electronics trade directories at a good technical li brary or inquire at companies that repre sent various electronics manufacturers To my knowledge the least expensive commercial PSRs are manufactured by Interlink Electronics Inc 331 Palm Ave Santa Barbara CA 93101 Figure 3isadrawing of one kind of resistor made by Interlink Electronics The company labels this device a Force Sensing Resistor or FSR Three FSRs can be purchased from the company by sending 5 plus 1 for postage and handling to the address given above The FSR in Fig 3 is printed on a thin sheet of clear flexible plastic which can be easily cut with scissors Referring to Fig 3 on the left is a square shaped de posit of material that has a moderately high resistance On the right is a pair of in terleaved electrodes brought out to two terminals In operation the side of the FSR that has the resistive coating is fold ed over the interleaved electrodes When the resistive coating is squeezed against the electrodes a variable resistance ap pears acro
17. this a the Orgi Xey part number uPp27C2550 25 EPROM iUnra iniet Erasable 28 Dip 36 3 AMP SILICON RECTIFIERS Pricing 1 70 170 s 100 NEC Microprocessor Chips Microprocessor Chips s S Wan 32 290 2400 000 16000 did a ai 1 000 375 10 Want 35 320 27 00 10000 18000 Digi Key Price For 0 Mga quinoa and Docs a bow ot 682 00 cal Ong Nur I qp ur ME Um Brt Microcomputer Op 31575 a c UPOG7ABHD amp Bn Microcomputer 40 Dio 1855 053 p RS106 each of valuas 0 302 to 0 910 UPDB8749HC High Performance Singit Chip 210 00 torai pes B Br Microcomputer 40 Din 18 55 A5206 ioschoi values 1 OQ 109 1Q UPDB BSAC Single Chip B BH N amp hannal m m A Tut DM 196 total pen 6 i es B D Microprocessor 40 Dip 335 oon Le AEM 4anch ot values 10Q to 912 UPOG086D amp Brt Microprocessns AOD 1665 f ins400 3 Amp SOPIV pasic 28 256 7280 19950 96 total PCS UPD8088 High Performance amp Bi n ERN x Microprocessor 40 Dip 14 06 N540 3 Amn 1O0PIV Plasoc 3G 270 2400 210 008 asa 3ean of vaiues 1002 to 20KO j 150 CAPACITORS f UPD7BOC High Pectormanca CP M 1NSA02 J Amp 200PIV Piasuc 3 283 7520 96 iotal pcs Compattie NMOS B Bit JN5404 J Amp 400Piv Punx 33 2 97 Microprocessor 40 Dip 335 f iNsaos 3 Amp SOOPIV Plasuc 35 315 10 Wert Resistor Assortment UPD 7008C 8 8it CMDS JN5407 3 Amp BOOPt Plastic 40 360 2 each of an standard values Microptochssor 40 Dip 764 F iN 3 Amp 1000PIV Plastic 50 360 68 to1s pcs nm m e 9 v
18. type MULTIPLEXER GAIN control and a PUSH TO CALIBRATE pushbutton switch The DISPLAY SELECT Switch has positions that let you select all eight inputs or inputs 1 through 4 or 5 through 8 for display on the scope s CRT display screen 78 MODERN ELECTRONICS November 1985 Within a final box are contained the OUTPUT connectors BNC types like the input connectors These are clearly identified by TRIGGER and VER TICAL labels on the panel In use multiplex sampling fre quencies can be varied between 40 kHz and 1 MHz while the MANUAL RUN Switch allows you to select single or multiple channel display The PUSH TO CALIBRATE Switch conveniently zeroes all traces Operation and Use E The users manual supplied with the Model 8001 gives specific instruc tions for multiplexer checkout de tailed theory of operation and worth while recalibration procedures Only two cables are supplied both coaxial types terminated at each end in BNC connectors For the trigger input we suggest you use Shielded coax cable with a secure ground The other seven ca bles can be fabricated with 18 gauge stranded wire preferably the expen sive test lead variety and suitable connectors Selected inputs are sequentially scanned at MULTIPLEXER RATE control settings They are summed into a D A converter staircase of equal amplitude steps Fig 1 as deter mined by the setting of the GAIN con trol Buffered signals reach the scope s
19. 1N914 1NA14B8 1N5231B 5 1V Zener Diode Voitage Regulators Prime TO 220 B05 7812 7824 7905 7912 Mix or Match 3 1 00 Micalnsulators For TO 220 Pkg 20 1 00 Voltage Reg s Unmarked 60 Prime May Include Positive Neg amp Adjust 15 1 00 78L08 Voltage Regi M106 TO 92 20 1 00 PN2222A 20 1 00 2N3055 50 2N5308 20 1 00 15 Cun 15 Per IC TTL 7403 7442 7404 7450 7410 7474 7437 7476 7438 7495 7440 74107 15 Cent 15 Per IC 7ZALSXX 74LSO2 74LS32 74LS08 74LS74 74LS10 74LS86 74LS20 74LS153 20 Cent 20 Per IC CMOS 40018 40118 4050B MC838 DTL 10 1 00 Opto Isolator H11 G2 6PIN DIP Specs 40 2716 Eprom 1 45 2732 Eprom 195 2764 Eprom 245 27128 EPROM 4 95 256K Dram 150ns Prime Hitachi Ideal For Mac Upgrades amp Expansion Projects 4 95 8243 I O Expander IC W Specs 2 95 UDN 6118 Display Driver 1IC Specs 85 UDN 6128 95 UCN 41 16B Osc Freq Div Clock iC Specs 5 1 UCN 4801 8 Chan Br Mos Latch Driver 1 OO LM339 LM3BO ULN2280 555 Timers TI NE556 Dual Timer Moto 741J 0p Amp Mini D p Hi Rel Pkg LM1310 Unmarked Tested Prime 74126 74151 74163 74365 74393 74LS158 74LS257 74LS257 74LS273 50 4 1 00 0 S 21512 caxx8 250m 512k 53 99 OTTAWA ONT 630 0400 CIRCLE NO 121 ON FREE INFORMATION CARD M MOTOROLA Advanced Micro Devices L1 8 99 pt 11 RE K a E CANADA 5651 FERRIER ST MONTR AL QU BEC 1 800 361 5884
20. 200 ohms R12 100 ohms R13 180 ohms R14 2400 ohms R5 10 000 ohms 2 watts R6 3300 ohms 2 watts R4 5000 ohm potentiometer Miscellaneous L1 Coil two in parallel see text Ra solver s manual control to set the de sired light level Many other applications for the Light Dissolver should come to mind We have presented here just a few ideas to get you started About the Circuit Shown in Fig 1 is the overall sche matic diagram of the Dissolver Dim ming action is controlled by varying the amount of current passed through triac Q4 and thus the lamp plugged into ac receptacle SO The triac is a solid state device that can be triggered into conduction in both di rections by a low level short pulse S1 Dpst slide or toggle switch S2 Normally open momentary ac tion pushbutton switch SO1 Ac receptacle see text Printed circuit board or perforated board and push in solder terminals socket for ICI optional heat sink for Q4 see text control knob for R4 suitable enclosure Radio Shack No 270 223 or similar 1 x 1 2 bracket 1 4 spacer silicone heat transfer paste ac line cord or exten sion cord see text machine hard ware hookup wire solder etc control circuits musi be kept isolated This task is ac complished with opto isolating triac driver ICI applied to its gate G It can be shut off only by removing the voltage at main terminal 1 or main terminal 2 MT
21. 45V R3 53 C8 6 8K 45V T 240pF R AMF LJ CE AF iu a pom 3 t i U3 20 R5 R6 R7 R21 9V 0 2 AY3 1350 100K 100k 10K 100K 7771 R4 z i 278K R8 33K DESID iuF 33K R11 X R10 i 10K 4 7K E i Ji 5V 49V q 1 GREEN el O pum TP3 c9 R2 ace A 680K X Y e YELLOW 3 M 4 J 5 Q1 EN BLACK 2N 2 2 gt E 38 wm 9 mana 49M 2 Lus E e x gt R12 10g F S e CK BLA 10K e a Ss TIP120 SS YELLOW D2 D5 R17 47uF 2N2907 R14 D11 S S 1N4004 3 3K 250V 100K 1N4146 amp Stu RED 4 Y xX D1 R13 S K yo a 1N4758A 33K Sx j TP4 w m J D10 v age IN4004 vw Y i g 3 a Y D6 D9 SS 1N4148 E S R18 9 10K Q4 S TIP120 sx R19 4 7K Fig 1 This is the ov It is powered by a 9 cuit Tune selections are made with DIP switch SI November 1985 MODERN ELECTRONICS 37 Plays tune until phone is answered or song over nonc C M EESLLx qANBR L LGULVLEULAILIEu uu a LC PARTS LIST Semiconductors D1 1N4758A zener diode D2 thru DS D10 1N4004 rectifier diode D6 thru D9 D11 1N4148 diode Q1 2N2222A npn transistor Q2 2N2907A pnp transistor Q3 Q4 TIP120 Darlington transistor U1 U2 4N25 opto isolator U3 AY 3 1350 music General Instruments U4 2732A EPROM programmed see Notes below Capacitors C1 C2 C5 10 4F 25 volt electrolytic C3 240 pF disc C4
22. JaLSt74N 74LS175N 74LS 190N 74LS191N algas Ag ac REO SSRN RRASSSSENN igEsaZiEEEEE I L dE BEST NMNOO HOUOGOU vN ID SSSR SSSBaA AARRE SESEB i PERRRIBCCRR RRERERES 8 EENAE NREEB EERBE SXEHE RENSABSAS Heads OE WAMKAS 5 SSARRSRR SY eeu awn e tab tat as ae at 885 j EET CE cU cmaonDodoocooeocoooooo0 NN S 6 51 51 B6 8 58 64 35 8 58 64 35 11 25 ga 37 5 0 anti 501 3797 5 01 3757 01 3757 8 00 45 00 483 36 23 5 91 44 32 08 53 10 SSSSSSSSEBSESSESESSRS SESS ee se ETA BSB alaaa SSEEEIZAREA e 8 HssRDuedESRSSNashLBBESSSN AQ MA Uu RNAP RREZSSZ dbBSEREHSAHHNE 8 yas asee eum NO we eee oe E aig at BENNA 3 BAINIS SESH BE SE He BEEBE BEL ANRANIL TE ANN SERB ERNA e E Wwa yap ge 4LSZ90N CMOS 74LS283N JBOBBEGEEEECSERREBEOODOBETPAXOBNMAXXX BINS gE Pen FAKCOON F4HCO2N TAHCDAN J4AHCOBN 74H C10N 7ARCTIN 7AHCIAN 7AHC20N 74M CZIN 74HC30N 7JAHC32N 74HC42N 74HC73N F4HC7AN TAHCT N 7AHC76N F 74HC85N 74H COGN TAHC 104N 74HC 07N 74HC112N 74HC113N 74HC125N 74HC126N 7AHCT33N 7 HCT3SN 74HC139N F4HC147N AHCIBIN 74HC153N 74HCIS4N TAHCIEZN 74HC158N 74AHCY180N 74HC BIN 74HC1G2N 74HC163N 74KC164N 7AHC165N 74HC174N 7AHC17ON 74H C193N 7AHC194N 74HC195N 74HC221N 74H C240N 74HC241N 74HC242N 74H C243N 74HC24AN J4HC246N a ma nd Pa e f ma me esis 2 z BEIRA BSSYSSSSKS ASRS
23. LCD display Bands 30 50 118 136 144 174 440 512 800 950 MHz The Regency MX4OOO is gives coverage in the standard VHF and UHF ranges with the impor tant addition of the 800 MHz andaircraft bands It features keyboard entry multifunction liquid crystal display and variable search increments NEW Regency Z60 K List price 379 95 CE price 216 00 SPECIAL 8 Band 60 Channel No crystal scanner Bands 30 50 88 108 118 136 144 174 440 512 MHz Cover your choice of over 15 000 frequencies on 60 channels at the touch of your finger Regency LU Ml NEW JIL SX 400 K List price 799 95 CE price 469 00 SPECIAL MuitF Band 20 Channel 9 No crystal Scanner Search Lockout 9 Priority AC DC Frequency range 26 520 MHz continuous coverage With optionally equipped RF converters 150KHz 3 7 GHz The J L SX 400 synthesized scanner is designed for commercial and professional monitor users that de mand features not found in ordinary scanners The SX 400 will cover from 150 KHz to 3 7 GHz with RF converters Order the following RF converters for your SX 400 scanner RF 1030 K at 259 00 each for frequency range 150 KHz 30 MHz USB LSB CW and AM CW filter required for CW signal reception RF 5080 K at 199 00 each for 500 800 MHz RF 8014 K at 199 00 each for 800 MHz 1 4 GHz Be sure to also order ACB 300 K at 99 00 each which is an antenna control box for connection of the RF converters The RC 400
24. Moving i j Iron Range X Rugged and accurate AC DC Cato ee metres ideal for power suppiles etc Oval style meter size app in ma Ca 07024 Pos 4 As used amplifiers XC 2 wide x 2 3 high cassettes to 10 WIS ot 0 10A Graduate acK stripe vee pattery Ch oF 5 ed Built Into PL 259 plug ideal for 27 MHz testing Lights up on carrer also shows modulation Rated amp t SW AC amp DC e a n scar tor High power tor amateur 4 ine ma a itis iden Cat Q 2090 L1 c bw 4 s 1 iver tc Large XV ment idac re ve dissipate i evel adju pattery 0 20V 10 up 6 95 ea huge amounts of heal 100W meter ANTT unts with AC amp DC s hole centes Cat Q 2080 2474 Shattuck Ave Ph 445 486 0755 390 Convention Way Ph 4415 368 8844 4980 Stevens Creek Blvd Ph 408 244 2266 10am pm EVERYDAY e PO Box 8021 Redwood City CA 94063 e 390 Convention Way e Redwood City CA 94063 e a maumesmone I HOURS A DAY eae eU o E eT sr Quote your Visa mastercard ee wS OE om y exo T M i Project Application A Simple Impedance Bridge This two component project lets you measure impedance determine resonant frequency calculate input output impedance ratios etc By William R Hoffman nyone involved in loudspeak er design and construction soon finds the impedance bridge to be an important basic to
25. Reprint st Radio Electronics Articie on Building Your Own Cable TV Descrambler with any purchase Add 4 00 Postage amp Handling TOLL FREE 1 800 227 8529 Orders Only 1 617 339 5372 Information JeW ELECTRONICS INC P O Box 800A Mansfield MA 02048 F CIRCLE 30 ON FREE INFORMATION CARD SPACE SATELLITE HANDBOOK 1986 Up to the minute current listing of all payloads platforms rockets and debris in orbit This annual giant encyclopedia lists 5 612 manmade objects in orbit around Earth Moon Sun Some are still up there from 1958 Data from NASA NORAD Smithsonian Lists common name of satellite international number origin country launch date period inclination apogee perigee radio frequency Handy 80 page paperback book 10 00 Quick N Easy Electronics Projects 40 electronics projects new practical build em tonite fun gadgets book 96 pages 7 95 Easy To Build Electronics Projects 40 electronics projects new different State of art high technology book 96 pages 7 95 Add 1 shipping per book Send cash check money order VISA of Mastercard Card users include number expiration Customers outside USA remit US dollars and 2 shipping per book ARCsoft Publishers Post Office Box 132SL Woodsboro MD 21798 BLER PARTS Ei PC PAPERS as First impressions Digital Research s GEM software for IBM PCs and compatibles and the low cos
26. Seta 6 E019 Bst rea TODE ENCODED VOLTAGE FROM oF TCO METER T 23 Flek O vu ia uv PREAMP NOTE gt 75 is R f of e M 41 P fay f L eta Hem ANN a PAREN HES E gt IST T K y 100 i 9 Ekon R a I lt gt ceo gt T9 pd be y 24 D j i e tate gt 4 Avoo J 4 rag t 4 4 POWER K CO METERS Jm cii ir a Pe Pea P e 23s Th 5 gt 22 af Trruh 323 Coes TU iri cv Wr icicO Fides 4 10K G 8 l ma Aa E WITH EDs THIS som Yor Ce TKGL Oz 316 4q BM SNG THEES HOLD A y f co n ADA ST ird CARE LC mic f C ep how the BASIC language was devel oped for commerical use through the association of Bill Gates with Ed Roberts the former finally setting up his own company Microsoft which Dr Uta Merzbach a curator at Smith sonian Institution s National Museum of American History and Forrest M Minis 3 FPOTZTRANSICTZ CoriPAFATOK SE oF Fikst 2 1 f 3 12 56 1 f tered books published by Radio Shack Photo by Forrest M Mims HI later developed the defacto standard operating system for 16 bit com puters MS DOS is especially in triguing So was his discussions of the early software pirates reviewing early MITS papers that Mims will donate to the Smithsonian Photo by Minnie C Mims His chapters on Silicon Law and Mims Versus Bell Labs can ser
27. o 00 0 d AMPLIFIER OPTIONAL Fig 2 A typical test setup Required items are the bridge oscillator and ac voltmeter The amplifier and chart tion or a very wide range to obtain adequate measurements from the im pedance bridge arrangement The impedance bridge is best built into a metal or plastic box For my prototype I chose a common sloping top instrument box with S located in the middle of the sloping panel and the input and output connectors flanking the switch as shown in the lead photo With this setup R mounts directly on the appropriate lugs of the switch and the connec tions to the D U T were brought out from the appropriate points in the circuit via a cable through the front wall of the box The connectors on the top of the box are all 5 way bind ing posts and the D U T cable is ter minated in miniature alligator clips Once the bridge was assembled I la beled the panel with a tape labeler Setup and Use Figure 2 details the various instru ments including options that are used with the bridge and the proper connections to be made Every time you use the bridge you must set up the system as follows 1 Turn on all connected test equipment If you are using a digital or analog multimeter set its function selector to ac volts 2 Set S7 to the position that BRIOGE a EO D U T SPEAKER Value of R1 ohms 2 tolerance Oscillator Output volts
28. some overlooking via ADXN Pitcairn Island One place Earhart def initely did not reach is this isolated piece of rock with about 62 inhabitants all ac counted for as guests or descendants of the Bounty mutineers AT amp T claims a coup in outstripping competing U S long distance phone companies in estab lishing service through New Zealand However there s only one phone on the island and the number isn t listed But two astute SPEEDXGRAM monitors in Oregon Bob Bodell and Bruce MacGib bon have heard communications from Pitcairn on station ZBP around 0400 UTC switching from 15718 to 12110 to 7859 kHz USB in search of clearest con tact with New Zealand In all probability phone traffic goes over this SW circuit Sa udi Arabia An anonymous Ameri can businessman visiting this country writes us that he has discovered the King dom is now a center of heavy radio jam ming especially on mediumwave but also on shortwave against broadcasts from Iran Syria Libya Israel and even the BBC in Arabic but never the VOA This bubble jamming comes from sites all over the country but the main oneisin the northeast near Dhahran Until this came to light Iraq alone was credited with this type of jamming Among the frequencies affected are 558 657 720 765 846 990 999 1071 1125 1161 1197 1224 1323605325 350114228 5375 1566 and 3200 kHz Any confirmation or refutation of this will be welcome Sudan non N
29. 1 Use SNATCHMON IIC to grab the lic monitor image 2 BLOAD IICMON F A 8000 3 CALL 151 4 8B64 05 5 8CCA EE F4 03 AO IC A9 C5 20 A8 FC 2C 61 CO 10 05 88 DO F3 FO 2A 6 8003 C8 ES EC EC EF 4C 59 FF 91 7 BSAVE KREBFMON F IIC A 8000 L 1000 8 Burn the new CDEF EPROM If your burner can handle a whole 27128 at one time combine and move your files downward toa Suitable buffer space in memory For instance do a BLOAD IICMON C A 2000 a BLOAD IICMON D A 3000 a BLOAD IICMON E A 4000 and fi nally a BLOAD KREBFMON F IIC A 5000 This gives you a 16K buffer starting at 2000 Free plans for a simple 27128 adaptor for older burners are available on re quest and are included as part of the Reset package The new boot prompt is Hello Note that the IIc self test never ends The C006 00 black magic is also not needed on the IIc To install the chip unplug lIc power and remove the six Outermost screws from the bottom Press into the front crack directly in front of the N key with a 1 dull putty knife to release the front snap The monitor is the chip di rectly under the keyboard center at D 18 slightly to the left of the speaker Make sure the dot and notch go to the left when you replace it Absolute Reset for the New Apple Ile The Absolute Reset for the old Apple Ile will not work on anew llecralleup graded to the new ROM set and should not be u
30. 1 1 0 5 10 12 5 or 25KHz e Dual color fluorescent dis play with memory channel readout and dimmer switch e Compact Size 4 3 8 H x I x 1078 D e Dial lock noise blanker combined S meter and center meter First ad X 1 e Optional RC 12 infrared remote controller e Optional voice synthesizer W hen recording the voice synthesizer automatically announces the scanr ed signal frequency Specifications guaranteed from 25 1300MHz No addi tional module required for coverage to approximately 2 0GHz See the IC R7000 receiver at your local authorized ICOM dealer Also available is the IC R 71A 0 1 30MHz general coverage receiver ALL THIS AT A PRICE YOU LL APPRECIATE ICOM exrTIT3II IrMOCATIOn 75234 R7000885 This booklet You say you re already trained in electronics but that you re not making enough money Well then maybe you don t have an accredited bachelor s degree to prove that your education is up to snuff Check out the Grantham Inde pendent Study B S Degree Program It could make a dollars and sense difference in your electronics career Grantham offers this program complete but without laboratory to electronics technicians whose objectives are to upgrade their level of technical employment Since the field of elec tronics is so enormous opportunity for ad vancement is always present Promotions and natural turnover make desirable positions availa
31. 19 CD4030 14 39 GU4081 14 29 MCt4411 24 1095 Aer Re LM350K 479 7547 a 99 CDan HM 179 CDN93 M 49 MC14412 16 195 LF351N 8 59 LM739N M 1 95 76002 n 1 95 CD4094 amp 195 MCI4433 24 17 95 1355 SHOREWAY ROAD BELMONT CA 94002 LF353N B 89 LM741CN 8 39 76477 395 C04035 16 49 MC 14 490P MC14572 11 85 PHONE ORDERS WELCOME 415 592 8097 Telex 176043 30003 1982 Nat Linear Data Book soos 4 95 CIRCLE 50 ON FREE INFORMATION CARD November 1985 MODERN ELECTRONICS 87 Mello Phone from page 41 232 200 9A 80 143 203 233 305 63 83 98 C5 Fig 3 Opening bar music for the Star Spangled Banner fore soldering them into place and don t forget the wire jumpers at loca tions W1 and W2 Use sockets for all ICs but don t install the ICs in their sockets until you ve performed the initial checkout procedure Should you choose to mount the TIP120 transistors on heat sinks be sure to electrically isolate them from the sinks That is place a mica insula tor liberally coated on both sides with silicone heat transfer paste be tween transistor and heat sink Checkout Connect the negative test lead of adc voltmeter set to the 10 volt range to ground test point TPS in the Mello Phone circuit use this test point as the ground or common reference for all voltage checks With the ICs still not installed in their sockets ap ply power to the ci
32. 2 1 6 2 0 2 4 mc through 310K 18 pt oF mund duabintine heads 1360 tota pes 22 pt 8 97 52 31 Wire wrap posta heid to true position of 015 pro 33 pt 8 89 66 71 viding true position of 00 on boards for affi 1 2 Wert Carbon Film Assortrrents 39 pf Bao 6671 cent nutbmatic wire wrapping 5 eech of the srandard values m senes i 47 pt t1 80 B8 53 a YOUR CHOICE TIN OR GOLD 1 0 1 2 15 18 2 2 ete through 10M j 56pr 1 BO Ba 53 Mine 50 microlech quid inis an gli eochemi 365 tatsi pcs 6B pt 13 38 100 35 TEXAS INSTRUMENTS QUALITY CEREREM E 82 pi 17 68 13796 TIN PLATED WIRE WR AP pain 74 Micremches Tin 13 18 2 0 2 4 erc through 910K 360 For Complete Specs on Physical Sizo and Electrical Pert e Description t 14 we pes Characteristics coneult your FREE DIGI KEY Cotelog UMEN Vs neret EM ID sons MEE cai 14 pin ite wrap tin 5 4 90 POPULAR VALUES CAIIG 16pw enewrap in 57 560 PANASOIRC QUALITY CAMB 8pm wre wrap tin 69 670 E Cawo 20 pn wire wrap tin 76 7 50 i 310 DISC C8122 22 pm ware wrap un si 820 CB 24 24 pin wue wrap un 91 a g mI CAFACITORS C93128 2B pin wire wr esum pin ware wrap bn jo a bes f PANASONIC LS SERTES 40 pin wore wrap un Miniter Ahutsimom Electrniytic Cipacitors 5 1000 202 0 tes fel NM Bac a en LCR EB l w aga n SEZREISSERE 885 DEPUN amp wr sa BHSEE Momm isussaizs2sosiH oh ted Go de Le GP WO SH a Ce ee ma GU C Og in 74LS173N
33. 2 E TM wiring technique to assemble the cir page of memory EPROM address Ae 932 35 Hi cuit Of course the printed circuit 000 00 must contain data 377 FF 8 988 36 11110 board technique is the simplest since EPROM address 377 FF in each SERI zd BAD it offersa neat logical component ar page must contain data 125 55 rangement with a minimum of actual which is a key to open the external hand wiring and minimizes the possi EPROM Following the tune data taining 16 tunes Camptown bility of making wiring errors the last two bytes should be 377 FF and 376 FE indicating the tune end marker and end of listing marker Fig 2isa diagram of EPROM mem ory allocation per page The first part of the Star Span gled Banner is shown in Fig 3 as an example of encoding Below the notes are shown the octal and hex codes to use If you don t have access to an EPROM programmer you can ob tain a preprogrammed EPROM con Races Beethoven s Ninth Sym phony My Darlin Clementine O Come All Ye Faithful Brahm s Hungarian Dance No 5 to name just a few from the source given in the Parts List Other tunes can easily be programmed from the sheet music contact the author for details Construction This is a relatively simple project to build You can use just about any You can fabricate your own pc board using the actual size etching and drilling guide shown or pur chase a ready to u
34. 2 meter dish anten nas with Ku band electronics at an eventually predicted price of some 500 terminal New television re ceivers with everything built in and controlled from a single multikeyed remote that will even menu your payment fee status and possibly pre sent and future programming is yet another benefit Top this all off with terminal installation and service by RCA and of course the entry of a major TV receiver manufacturer into the TVRO business backed by excel lent technology Programming is expected to be first rate At 45 watts per channel there should be little or no outage due to heavy rainfall or momentary eclipses We are told that a 1 2 meter tion will have a significant impact on 4 foot receptor will operate within satellite TV viewing ME SSE ae ee ee See eee 84 MODERN ELECTRONICS November 1985 ception to the curves illustrated in Fig 3 is the case of the bass reflex system where the single resonance peak will be absent usually replaced by two smaller peaks Checking capacitors and inductors the latter including transformers is as easy as observing the impedance trend of the readings on the meter s display as the frequency of the oscil lator is varied Any good capacitor will show an impedance that con stantly decreases as the frequency is increased With a good inductor on the other hand impedance will in crease as the frequency is increased You can use your measure
35. 20 aos e2795 40 Prog Keyboard Display interface 595 E2515 A 254 ES UE E m ENDS 745194 18 x49 749570 16 295 8282 20 Octal talch 649 onsin M iaa Mete e2Si8i 995 norice a F LINEAR LM747N M 69 749195 15 149 748571 06 295 8284 18 Clock Generator Driver 549 LOP 8 10 LM748N 8 59 745196 745572 8286 0 Octal Bus Transceiver 649 DATA ACQUISITION f noin n 195 LFSSSN 6 109 rggac 995 745240 748577 E287 20 Octal Bus Transcerver inverted 5 49 DC10 Moslek Converter 4 5V 10 9V TLB ICP 8 59 LF356N B 1 09 LM1456 B 195 6288 20 Bus Controller 1395 ADCO801 20 8 Bit A D Converter 1 4L SB TLOR2CP i LM358N 8 59 74ALS240 20 2 25 3741 40 8 Bit Uni Penpheral tntertace 1095 ADCOBD4 20 8 81 A D Converter LSB TLOBCN M 195 LM1488N 4 69 JANLSQA M 59 7AMLS32 M 65 7ANLS244 20 225 8748 40 HMOS EPROM MPU 19 95 ADCOBO8 28 8 Bi A D Conv w 8 Channel Analog LM109K 5 95 LMON M 495 LMI4B9N 14 69 TAALS74 M 79 MASAMS 73 259 879 40 MPU B Bit EPROM Vers of 8049 1995 ADCOB09 78 amp Bi A D Converter 8 Ch Mult LASIK 9 39 LM373N 14 495 LM1490N 4 99 74ALS109 16 74ALS373 20 8751 40 CPU wi4Kx8 EPROM amp 128x8 AAM 29 95 ADCOB16 40 881 A D Cony w 16 Channel Analog LM302H 2 49 LM377N 14 1 95 95 74AL5112 36 74ALS374 20 ed ADCO817 40 8 Ba A D Converter 16 Ch Multis LM304H 95 M1605CK 9 8755 40 GK EPROM with UO 1995 DACOBO 18 8 Bil D A
36. 28 DON T GET ANY SOLDER ON THE PIN TIPS 3 Push a 13 pin machined contact DIP Strip onto pins 1 13 as shown Push an 11 pin machined contact DIP Strip onto pins 15 25 as Shown 4 Carefully roughen one side of the SPDT stide switch and the bottom of the 28 pin DIP socket between pins 14 and 15 Use very fine sandpaper or steel wool GLUE SWITCH IN POSITION SHOWN Glue the switch to the 28 pin DIP socket as shown using superglue or epoxy Let sit overnight and then verify that the switch Still works DON T GET ANY GLUE INSIDE THE SWITCH of pin 14 00000000000000 from each end 7 Take a two inch piece of red 24 Solid insulated wire and Strip 1 4 inch from each end 7 OOOO 28 26 toam aol oo C o 9090 adaptors o0000000Q0 a keyboard 5 Prepare a 3 4 inch length of bare 24 wire Connect this wire to pin 14 of the 28 pin socket and then to the nearest pin on the SPDT slide switch Solder both connections using a spare DIP strip as a safety backup heatsink Cut off any remaining wire Be very careful not to get any solder on the tip 6 Take a 1 3 4 inch piece of green 24 solid inSulated wire and strip 1 4 inch Solder one end of this green wire to pin 26 and the other end to the center pin on the SPDT Slide switch Solder one end of this red wir
37. 2807 115 Manual or autoranging on volts and ohms with 0 5 DC accuracy Model 2816 150 Same features as 2807 with 0 25 DC accuracy For more information contact your B amp K PRECISION distributor or write for specifications BAC PRECISION DYNASCAN CORPORATION 6460 West Cortiand Street Chicago Illinois 60635 312 889 9087 International Sales 6460 W Cortland St Chi cago tL 60635 anadian Sales Atlas Electronics Ontar South and Centrai American Sales Empire Exporters Plainview NY 11803 CIRCLE NO 158 ON FREE INFORMATION CARD 61 ELECTRONICS NOTEBOOK on the resistance range of the pressure sensitive resistors Try values of from 1000 to 100 000 ohms You can also ex periment with which resistor is connected to 4 5 volts For initial experiments con nect the free end of a fixed 1000 ohm re sistor to ground Connect the PSR s free lead to 5 volts Here s a listing that displays CoCo s joystick values 10 CLSO 20 PRINT Q 133 JOYSTK 0 30 PRINT 138 JOYSTK 1 40 PRINT Q 148 JOYSTK 2 50 PRINT 153 JOYSTK 3 60 GOTO 20 from page 11 model 487 Seneca ar 1004 Hz tone generator for line checking and signal tracing Among the new DMM s features are Simpson s Digalog digital analog LED display with pulse con tinuity and low battery indicators and a true rms ac capability Its 29 ranges are optimized for telecommu nications testing
38. 29 95 Additional Add Ons Available MEMORY EXPANSION KITS IBM PC PC XT and Compatibles The IBM64K Kit will increase memory in 64K byte Increments The Kit is simple to Install just insert the 9 64K RAM chips in the provided sockets and set the 2 groups of Switches Conversion documentation included IBM64K Nine 200ns 64K RAMs 9 95 IBM PC AT Each kit comes complete with nine 128K dynamic RAMS and documentation for conversion IBM128K Nine 250ns 128K RAMs 79 95 IBM PCXT Equivalent 130 Watt Power Supply UPGRADE YOUR PC Input 110V 60Hz Output 5VDC 15A 5vDC 0 5A 12VDC 4 2A 12VDC 8 0 5A Plug compatible Connectors Fits into IBM PC Weight 6 Ibs _IBM PS 119 95 Prometheus Modems The ProModem 1200B BS is a 1200 300 baud modem card which plugs into IBM PC and XT Provides a third serial Comport Two versions available 1200B without software and 1200BS with software The PM1200BS is supplied with powerful MITE communications software from Mycroft labs Simie DISK DRIVES COMP Sis included RFD480 Remex 5 DS full ht 79 95 FD55B Teac 5 DS half ht 119 95 SA455 Shugart 5 4 DS half ht 109 95 TM100 2 Tandon 5 DS full ht 129 95 514 DISK DRIVE ENCLOSURES Complete with power supply switch power cord fuseholder and connectors DDE 1 FH Houses 1 full hi 5 floppy drive 69 95 DDE 2HH House
39. 5AMP 50V Bridge A TO 5 Pkg 25AMP 200V Bridge Soider Leslee i Zenith TV ReplacementiC S ial 1 Each 221 42 221 43 221 45 221 48 221 69 221 79 221 87 221 96 221 ie 221 105 221 106 221 140 2SD900 Horiz Output W Damper Diode 2 95 2SC11728B Toshib Horiz Output Trans 1 95 Winegard 4 Bay Bowtie UHF Antenna 19 50 IC Storage Bu ug Box Holds 30 IC s 1 75 Precision Multr Turn Trim Pots Copal 100 OHM 500 OHM 1K 2K 5K 10K 20K 50K MEUS 500K 1M 85 Each 3 2 10V Hor Mt Single Tum Trimmers 100 OHM 1K 10K 25K 50K 100K 4 1 Heat Sensitive Switch 150 C 10 1 00 Mixed Coil Asst 10 1 00 Buzzers 3 1 00 Chip Resistor PUMP 20 1 00 Chip Resistor 470K 20 1 00 Chip Ca plap 20 1 00 Jumbo Red LED W Built In Resistor 30 1 MRF 901 Hobby Grade 60 Good 10 1 00 IC Ass t Hobby Grade Some Marked 30 1 20 Cent 20 74SCXX Series Special Octal Interface Circuits Equivalent To 74LSXX Series Low Power ISO CMOS Technology Short Propagation Delay opaan Noise Margins h Current Sink Source Capability 7498137 1018 Inverted Decoder Latched 74SC138 1 O18 Inverted Decoder 74SC139 1 Of 4 Inverted Decoder 7ASC237 1 Of 8 NoOn Inverted Latched 74SC238 1 Ot 8 Non Inverted 7ASC239 1 Of 4 Non Inverted 7ASC240 Octal Buffer Line Driver Inv 74SC241 Octal Buffer Line Dnver N I 74ASC244 Octal Butter Line Driver N I 74SC245 Octal Bus Transceiwer Non I 7ASC373 Transoarent Latch Non Inv ISORTIP n 366 9684
40. 6 taken directly from the generator and the center trace from the receiver s video detec tor Note that the 6 microsecond pulse is precisely coincident with the generator s bottom NTSC color bar sync but is somewhat ahead of the re ceiver display As you can see all col or bar levels are not exactly precise but burst and horizontal pulses are well defined and of proportional am plitude The interesting part how ever Is the receiver s waveform of approximately 3 microseconds of de lay a very useful measurement when comparing analog or digital responses under synchronous conditions User Comment Decidedly the Model 8001 Scope Multiplexer is going to require a short familiarization period for a new user But it will be worth the effort since this is certainly a practical digital analog switch accessory that pro vides adequate operation from dc to low megahertz frequencies Of course it goes without saying that you are going to need a good dual in put scope with one channel to receive the Multiplexer s trace signals and the other to check ac dc levels in any suspected high swing voltage equip ment to prevent exceeding prescribed parameters We would like to see somewhat larger trace amplitudes and more linear trace separation for the GAIN control We can truthfully recommend this 4 8 channel multiplexer to anyone who wants to upgrade his two chan nel scope It works very well with all those low voltage digital p
41. 95 n TAHCUM is unbufteren TA S125 M 59 745241 20 99 81L 97 0 1 49 8224 16 Clock Generator Drver 219 745188 15 32x8 OC 6330 1 175 9 746240 TASi26 M 74 8243 81595 20 149 8228 28 Sys Cont Bus Onver 745428 3 95 745287 i6 256x4 PROM TS Bor D amp 79 35 700244 m 19 8237 5 40 High Pert Prog OMA Cont 5MHz 1295 745288 18 32x8 PROMTS 6331 m 179 35 Tac M 733 MW 229 745241 A 1 8238 28 System Controller 745438 495 74 387 15 256x4 PROM OC 6300 95 35 74C151 18 2 19 74374 A 229 74904 M 219 8243 24 0 Expander tor 48 Senes 3 95 745471 20 256x8 PROM TS 5309 1 435 35 740154 M 325 cO M 59 745132 745244 0 219 82504 40 Async Comm Element 995 749472 20 512x8 PAROM TS 8343 1 435 0 T5 08 175 MO M 70 74133 1B AS 745251 amp 99 82508 40 ACE IBM PC oF XT Software Compatible 095 749473 20 512x8 PROM DC 63 4 95 A5 746180 o 119 93 M 59 745135 15 80 745253 t 99 8251 28 Prog Comm 1 0 USART 325 748474 9 4 512x898 PROMIS 296N 495 35 740161 16 119 74C906 u 59 74 136 WM 139 74525 19 99 8251A 8 Prog Comm Interface USART 349 745475 4 51248 PROM OC 6340 4 95 39 74016216 1 19 TACOQ H 89 749138 16 88 75258 15 99 8253 5 24 Prog Interval Timer an UC 2 MIS 6 95 4 i 4 9 95 74C42 16 1 19 740163 1B 1 19 7TAC91 28 8 95 749138 16 89 745273 0 239 8254 24 Programmable Interval Timer 1349 745570 16 512x4 PROW
42. By the way all artwork including legends and accompanying text you see here were completely and totally drawn using Applewriter on a Ile Not too shab by for a word processor eh I sure wish I could find a way to do graphics this good on a Macintosh Please keep me posted on your multi monitor activities What s New in the Data Book Department Some careless Modern Electronics reader must have left two data books sitting too November 1985 MODERN ELECTRONICS 67 close together on the shelf for there s now the pitter patter of happy little data books everywhere Actually the terms stampede and avalanche and tor rent come to mind Let s quickly run through what showed up here during the last few weeks As usual most data books have an optional price typically between 5 and 10 You can often get these free if you make a professional enough request Exceptions are National Semiconductor Motorola Signetics and Texas Instru ments These outfits have such extensive HARDWARE HACKER Fig 2 Isometric drawings are easily done using a Laserwriter printer and Apple writer with the Apple Ile computer and detailed data book libraries that al most everyone has to pay the going rate Where to start Monolithic Memories has a pair of new data books the sixth edition of the LS Databook and the second edition of the Systems Design Handbook These are mostly about PALs or pro
43. Cat 1270 RF Probe Extend the usetul range of your multi meter way up into the RF range with this neat probe Frequency response is 150Khz to 30MHz ret SOOKHz Comes equipped with banana plugs for direct multi meter connection Ideal for use with most multimaters ag MPS Cat Q 1138 Don t spend a fortune buying a tachometer build your own and save Displays engine speed in an analog form in an illuminated row of LED s instructions included a great it Cat K VALMEAT Hove you priced a built up wottmeter lately Just re leased EE Featuring stripline circuitry ZENEAN this kit is easy to buitd amp use AU Electronics for oF m Model Railways Specifications Now railway modellers AM a gn P une A E s 9 DIRECTIVITY 20db 65 gat o9 ose on A xia MG pian B h INSERTION LOSS 0 3db qoo eo 2 10 an vat gree of realism on t eir ma il e c agan 7 ex av V ie X Ao layouts L I r Peces FREQUENCY RE narrow O09 a A got me oo 6 ie e youts Lever crossing ivt SPONSE band m OM ec A of 9 9 ons flashing unit scale fluo usable over 400 520 NO M p e o6 rescent lamps street fr E so QC xe ex signs Devices to build pene pale pil Pee eo OC Sart m y Cat B 3633 Sui eS Naina E LAM o at K 6342 eO Iac oo iss N lL Ab ONLY 330 95 ec cy coe exo 9 o Met me OMNES reeden 3 ve m SEE AUG o We
44. Communications Man ual by R Harold Kinley Prentice Hall hard cover 420 pages 29 95 Written for the electronics communi cations technician this book can well serve as a complete one source test and measurement reference It covers AM FM and SSB transmitters and receivers as well as antennas transmission lines and remote control lines It tells you what equipment is needed for a given test dia grams how the equipment is to be con nected and gives the step by step pro cedures to use to obtain meaningful re sults Of course numerous examples and diagrams show you how to analyze and interpret the test results as well The book is replete with procedures for making power and frequency measure ments audio response tests calibration procedures to name just a few Specific procedures described include how and when to usethe Bessell Zero method to set the deviation of an FM transmitter how to use the Autopeak modulation mon itor to determine and set average modula tion of an FM transmitter SSB transmit ter tests and measurements etc Throughout the book the spectrum ana lyzer is amply used though there is a close up look at the latest in communica tions test and measurements as well The text is written concisely in a style that befits a book meant for the profes sional service technician It is lavishy il W NEW LITERATURE ERR Breadboarding Interconnection amp Test ing Devices Catalog A P Produc
45. Often times some really offbeat axonometric projection will show an object or an as sembly drawing in its best light But Applewriter and Postscript could not care less A trig calculation is a trig calculation no matter how weird the an gle or how funny the ellipse There are a nearly infinite number of ellipse tem plates sitting inside the Laserwriter and they are all equally accessible Thus you can easily do virtually any 3 D axonome tric drawing about as simply as you can do plain old isometric Perspective too More on axonometric projections ap pears in just about any book on drafting or tech illustration Write or call if you need any more info on any of this ME NEED HELP Phone or write your Hardware Hacker ques tions directly to Don Lancaster SYNERGETICS Box 809 Thatcher AZ 85552 602 428 4073 November 1985 MODERN ELECTRONICS 69 l fies een Ih DESCRAM We stock the exact parts and PC Board for Radio Electronic s February Article on building your own Cable TV Descrambler 701 PARTS PACKAGE 29 95 Includes all the original resistors capacitors diodes transistors integrated circuits coils and IF trans formers BKAN K5552A XX 702 PC BOARD sae 12 95 Original etched amp drilled si k screened PC Board used in the article 704 AC ADAPTOR 12 95 14 volts DC 285MA Both 701 amp 4702 39 00 FREE
46. The JE883 provides the user with up to 64K of additional or buffered memory 18 pages of information Using the parallel jumper cable supplied the JEBB3 will attach to the JE amp 880 above Parallel Card needed tor operation The JE883 inciudes a standard parallel input with both parallel and serial R5232 buttered outputs With these featufes you may access and butter information lo two types ol printers one serial one parailel simultaneously Complete with instructions Key a b JE883 P S Buffer 0 0 ee 79 95 APPLE APPLE B 27 and We we cori oc Wademachs of Apote Compute EPROM PROGRAMMERS JE670 GANG EPROM PROGRAMMER 28x TO 512k E EPROMS TRS 80 COLOR AND COLOR II Easy to install Kit comes complete with 8 each 4164N 20 200ns 64K Dynamic RAMs and documentation for conversion Converts TRS 80 Color Computers with D E ET F and NC circuit boards to 32K Also converts TRS 80 Color Computer I to 64K Flex DOS or OS 9 required to utilize full 64K RAM on all computers MRS BAK A Lalanin asus amd 2A 11 95 Update TRS 80 MODEL IV 4P Update Easy to install Kits come complete with TRS 64K 2 8 ea 4164N 20 200ns 64K Dynamic RAMs TAS 64K 2PAL 8 ea 4164 s plus PAL Chip and docu mentation for conversion TRS 64K 2 Expands Mode IV from 16K 64K or Model IV eU NEN REA ae n z e ts a Stand alone Programmer that gang Drogram amp AP from 64K 128K w Mem Disk 11 95 mos EPROMS
47. The new Radio Costa Rica set up with U S aid in return for relaying the VOA operates from behind an unmarked door on the third floor of the Cristal Bldg in downtown San Jose protected by a guard armed with a machine gun The main 50 kW transmitter near Ciudad Quesada is heavily fortified Both it and a 2 kW unit in San Jose itself operate on 930 kHz The larger unit is aimed right at Mana gua where ironically the Nicaraguans had to do nothing at all to block it since there was already an off frequency local station near the VOA channel causing a heavy heterodyne even in Costa Rica Enthusiastic IDs are common on Latin American stations but Radio Columbia on 4850 and several mediumwave chan nels takes the cake Their standard ID goes Columbia Columbia Columbia but SPEEDX reporter Tom Kephart in Michigan heard them running a phone in contest to see who could say the most Col 74 MODERN ELECTRONICS November 1985 UT aos ee E umbias in row the winner reached 26 before gasping for breath If you don t think that s remarkable try it Cuba non In DX South Florida Steve Reinstein notes the lack of cooperation between two minor anti Castro clandes tines both Radio Antorcha Martiana 7080 and La Voz de Alpha 66 on 6666 kHz variable schedule their half hour broadcasts Tue Thu Sat at 0100 UTC Whether they switch to 0200 when Cuba goes off DST or when the U S does is not clear at this po
48. amp 1835 AP Special Assignment 2030 amp Sun 0130 Radio Smithsonian 2135 amp Sun 0235 The Week in Review daily at 2200 2300 ECTRONICS Broadway Hicksville NY 11801 FREE INFORMATION SERVICE For further information on products dealers or literature in this issue circle the appropriate numbers below Be sure to include your name and address before mailing 7 19 31 ah SITERES amp SSESERSa ERaesseERe amp 23855855 102 114 12 108 120 132 150 162 174 156 188 180 ah ah ho ab b b S2ECRGSBAIRSS 76 MODERN ELECTRONICS November 1985 dropping the final third on weekdays All Things Considered 2230 amp Sun 0430 UPI Roundtable Sun 0035 amp 0935 What s the Issue 0330 amp 0830 News mark 0535 amp 1035 Reporters Roundup 0630 amp 1130 The Source Report 1235 amp 1735 Perspective I 1330 amp 1830 Perspec tive Il 1435 amp 1935 Howard Cosell Speaking of Everything 1535 amp 2035 World News This Week 1635 amp 2135 Listen Closely Sun 2330 amp Mon 0330 Monitoradio Mon 0135 amp 0635 Face the Nation 0335 amp 0835 Meet the Press 0530 amp 1030 This Week with David Brinkley Of course one and sometimes both air ings of some of these are often pre empted by sports These are winter times until the end of DST the last Sunday in October all are one hour earlier by UTC AFRTS uses four or five frequencies at once selected from 21570 17
49. came a new way to battle the invisible and effective microwaves of police radar It could sense the high power continuous emissions of X Band radar well in advance of its effective range even over hills and around corners Thus a driver could be afforded plenty of warning that he had best betraveling the posted speed limit for the coming miles until the radar trap was passed Asis the case with any new techno logical wonder the first generation 24 MODERN ELECTRONICS November 1985 bm Tu ru Pacta HEHTHE FHIZITTETEETIPRT A zh rf FT E ar Ta a Pw Ht of radar detectors did their job in a most basic way They usually did de tect the presence of police radar when it was being used and in fact did save countless motorists from speeding tickets and some likely accidents because they were forewarned But they would have to improve because the next salvo in the radar war was fired by the other side and it was substantial enough to make counting onimmunity through radar detection a risky endeavor This salvo was actually a two pronged attack First a number of states decided that this activity went against the grain of a society intent upon enforcing its laws so they took the legal approach In essence such states banned the use of radar detec tors making such use a ticketable of fense In the case of a few states that took an even more hard line ap proach a motorist caught with a ra
50. detectors These are particular ly handy for drivers who may want to transfer their radar detector from one family vehicle to another and also for those who want to regularly remove their unit from the car to pre vent the possibility of theft when it is parked The latest generation of radar de tectors incorporate sophisticated superheterodyne circuitry Unlike their passive first generation cou sins which simply determine that mi crowave signals were present in an area and then signaled a warning these new devices take a more active rolein protection againt policeradar RADAR DETECTOR BEL Tronics Limited 3031 West Pawnee Wichita KS Brand Name Micro Eye Selectra Cincinnati Microwave One Microwave Plaza Cincinnati OH 45296 Brand Names Escort Passport Controlonics Corp Five Lyberty Way Westford MA 01886 Brand Name Whistler Electrolert Inc 4949 South 25A Tipp City OH 45371 Brand Name Fuzzbuster Dynascan Corp 6460 West Cortland St Chicago IL 60635 Brand Name Cobra Trapshooter An important distinction is that when a suspect signal is received it processes and analyzes the incoming signals to determine if they are being generated by radar or by a source other than radar This electronic fingerprinting prevents the unit from false triggering from most other than radar sources Some of the new radar detectors take a different approach Instead of discounting all s
51. fall times of 18 ns produce a 20 MHz bandwidth Fig 5 TV timer clock is obvious chang ing channels and audio are not bipolar transistors along with their support components So much for the innards All input and output connectors and controls are located on the front panel neatly grouped according to function A large POwER push push switch illuminates when power is ap plied to the instrument Input con nectors are all BNC types and are la beled through for easy identifica tion Between the two four connec tor rows appears the legend iNPUTS 5 V MAX relieving you of the need to have to remember the maximum in put voltage limits that can be applied to the inputs The TRIGGER LEVEL control is a slide type potentiometer with grad uation marks on the panel though j i ST i pm ae E lan ipt Mid Fig 3 Strong differentiated triggering produces precise square waves Fig 6 Screen shows analog and digital signals and microsecond delay there is no index mark on the slider knob to serve as a reference Trigger slope is selectable with a small slide switch Boxed off in an area separate from the aforementioned inputs and con trols are a MAN RUN Switch large IN CREMENT pushbutton switch and a rotary type RATE control with gradu ated to panel markings and a pointer line on its control knob In a second boxed off area are a DISPLAY SELECT Slide switch a rotary
52. fash ioned from the conductive foam used to ship CMOS and other voltage sensitive semiconductors Many other kinds of PSRs are also available In this month s column I ll discuss several kinds empha sizing an inexpensive commercial device which has recently become available I ll also present some specific circuit and computer applications Do It Yourself Pressure Sensitive Resistors In 1969 I was attempting to measure the forces exerted on a small homemade infrared seeking guided rocket sus pended in a wind tunnel The wind tunnel was fashioned from a length of stove pipe fitted with air compression straightener and expansion stages When suspended COPE ER WIRE VA ARNISHED MOVEMENT CONDUCTIVE PAINT Fig 1 A simple copper wire pressure sensor from the passenger side of my 1966 Chevy the wind tunnel achieved an air speed of 90 miles per hour when the car was driven at 70 mph the legal speed limit at that time One of the force measuring devices I devised was a short piece of copper wire coated with an insulating film As shown in Fig 1 the insulating material was re moved from a short length of each end of the wire The wire was then dipped into a commercially available conductive paint which was blended with minute particles of copper After the paint dried the coat ing formed a resistor whose resistance could be varied by bending the wire Sep arate leads were attached directly to th
53. for 45 00 SN gt d dingeeen New Stereo cassette mechanism TRANSISTORS THREE WIRE Ae mounting centers Includes record playback and 2N706 4 for 1 00 MALE CONNECTOR ULTRA MINIATURE 2 50 each 10 or 20 00 ase heads 2 12VDC motors 2N2222A 3 tor 1 00 5 50 each 6 18 3 flat 1 50 each 5 VDC RELAY i drive belts pulleys 3 12VOC PN2222A 4f 1 FEMALE CONNECTOR E Solenoids pinch wheels and other 2N2904 3 ior n 5 50 each 8 18 3round 2 00 each eae 1 NEGGOETIEU p g SPRING LEVER mechanicalparts These parts 2N2904 3 tor 1 00 8 16 3round 4 00 each High sensitivity E TER MINALS used on other current model 2N2905 3 for 1 00 S COIL 120 oh decks would cost several times 1 0 C CONNECTOR ohms Two color 7 z at MJ2955 1 50 CONTACTS t amp ded our selling price if purchased 1 2N3055 1 00 Will press fit on z code separate standard ribbon cable COMPUTER Mounts in 14 pin DIP socket terminals on a o B g si parately Build your own audio PMD IND 1 00 BEP 6 25 1 25 each sturdy 2 x or data recorder or use for spare TIP 125 75 DB 25 Socket 6 75 GRADE 10 for 10 00 3 bakelite lo e o f parts 5 X 3v2 X 3Va 36 PIN MALE 5 50 CAPACITORS pate 36 PIN FEMALE 5 50 MINIATURE Great for er enclosures or 750EACH 2FOR 12 50 power s es 2 000 mfd 200 VDC 6 VDC RELAY coy c t TRANSFORMERS 1 DIA x5 HIGH 2 00 Aromat ASO 6V cec 3 600 mtd 40 VOC Super Small GS TWIST LOCK 1 DIA x 3 HIGH 1 00 S PD T relay MINIATUR
54. for S 100 STD RCA Cos mac and Multi Bus systems Another sec tion describes 151 card racks and cases in a wide variety of sizes and configurations and contains a cross index between card size and case model number The connec tor section lists Euroconnections for VME systems IDCs subminiature D connectors and card edge connectors In cluded in this section is information on DIP sockets Wire Wrap posts and ter Continued on page 82 P PRODUCT EVALUATIONS Global Specialties Scope continued from page 20 ably linear staircase waveform M I L LL La oe hs LCS ETUITI A La WT Fig 4 A 16 1 frequency difference still locks all waveforms in sync quency equipment This should not pose much of a problem with most consumer products including computers and video The Model 800 carriers a retail price tag of 395 General Description Packaged in a sleek 10 W x 71 D x 4 2 H cabinet and weighing only 3 lbs 12 ozs the Model 8001 Scope Multiplexer supplies both trigger and vertical output signals and sums all inputs into a staircase waveform be tween Oand 400 mV Contained with in the cabinet is a transformer iso lated fused power supply that deliv ers four regulated voltages to various points in the instrument s circuitry The circuitry itself consists of nine in tegrated circuits and eight FET and Fig 1 Multiplexer generated a reason Fig 2 Trace rise and
55. for each ma chine Note that the new IIe version is pretty much the same as the old Only the entry point and length of the code change somewhat But close doesn t count for much Note further that the IIc version has two major differences Firstly you must use a 27128 EPROM to hold the entire monitor Secondly the patch goes into the F area of the monitor rather than the C area The patch is in three pieces There wasn t quite enough room to put it all in one place 54 MODERN ELECTRONICS November 1985 Free construction details of a sim ple adaptor that will let a 2764 EPROM burner handle a 27128 are available from me on request I also havea complete ready to use abso lute reset software package that in cludes all details needed for all three versions One minor bug Some of the text talks about a 4 second delay on acti vating the absolute reset The present value is 2 8 seconds which is consis tent with the present checksums need ed to pass all memory diagnostics There has been lots of reader inter est in an absolute reset for the older Absolute Reset for the Apple IIc The Absolute Reset for either Apple Ile will not work on a IIc and should not be used Instead a three piece patch that overwrites part of the F ROM area should be used Note that the entire monitor gets written into a single 250 nanosecond 27128 EPROM To build an Absolute Reset for the new IIc
56. for open primary LV supply Checks for error in interface connections Checks for proper LV regulation Checks for proper start up circuit operation Checks for shorted horiz driver transistor Checks the operation of the horiz osc driver circuits Checks B run supply for the horiz osc driver circuits Checks all circuits in the TV set that rely on scan derived B Automatically circumvents all start up circuits and horiz drive related shut down circuits X eH FH OH X HOOK UP identical to Mark III RED HOOK UP LIGHT means that you have made an error in hook up No damage has been done correct the problem then continue RED EMITTER LIGHT means that the ground path for horiz output stage is open Correct the problem then continue RED B OPEN LIGHT means that the primary LV supply in the TV set is open Correct the problem then continue No top row lights equals normal Look at the middle row of lights RED START UP LIGHT means that the start up circuit in the TV set IS not working no start up pulse GREEN START UP LIGHT means the start up circuit in the TV set is working normally Yes it is 100 accurate Even on Zenith s single pulse start up circuit RED HORIZ DRIVE LIGHT with a green start up light means that the horiz driver transistor in the TV is shorted E to C GREEN HORIZ DRIVE LIGHT means that the horiz oscillator and driver circuits are operational READ TH
57. horizontal 0 866 x y Here x y and z are the original three dimensions while vertical and horizontal are the final directions on the final two dimensional page Circles are done as el lipses with a magic angle of 35 degrees and 16 minutes either flat for the top or ro tated 60 degrees for the sides Trig freaks will note that 0 5 and 0 866 are the respective sine and cosine of 30 de grees while 35 degrees and 14 minutes is the angle whose tangent is 0 5 Thelettering is nothing but a stock font that gets slanted and rotated You either lean the letters forward or backwards 30 degrees utterly trivial with Postscript and then rotate the message up or down an additional 30 degrees as needed The other nine lettering orientations not shown in Fig 2 are also easily done Isometric is ideal for exploded views that show how things go together partic ularly when lots of round parts are in volved One limitation is that boxy sub jects seem a tad out of proportion with the far corner looking too big You can see if you stare at Fig 2 long enough This is caused by your brain being used to seeing things in perspective You ll find more isometric examples in Fig 1 Actually isometric is only one of an in finite number of possible axonometric projections Draftsmen and tech illustra tors typically avoid most of the other viewing angles like the plague since they used to be a royal pain to draw
58. iM39ISN 18 239 CD4528 18 119 20pnilP 3t 28 26 24pn 6 n 68 65 24pnWW 35 119 109 eader Covers UM3367 109 LMSSON M 79 LM39I6N 18 239 C04520 16 169 24pinlP 33 30 28 28pmn56 85 75 28pnWW 69 155 139 4pnHC 35 33 F NE558N 16 158 a LM337MP 1 15 RC413ON 14 125 CO453 6 B9 28pnlP 40 37 35 36pnSG 1 2 115 99 35pnWW189 179 169 6pnHC 19 37 15 LM3377 189 NES6AN 16 195 RCAT51NB 8 195 CD4538 6 146 4tpnlF 49 4 43 40pnSG 439 125 145 40 pin WW229 195 179 2pm HC 29 25 22 LM3A8K 695 LM565N i4 98 RC4193NB 8 1 95 pai M 145 10 Minimum Order US Funds Only CA Residents Add 6 4 Sales Tax ee ee ho eee o Uecr e D EK PE 4543 iE 0119 Shipping Add 5 plus 1 50 insurance Send 1 Postage for FREE 1986 Jameco Catalog Pnces Subject to Change M3408 12 135 LMS67V a 99 LM42S0CN 8 149 CD4553 16 495 Send stamped self addressed envelope to receive a Monthly Sales Flyer FREE NESTON 16 295 NE532 B 189 CD45668 ib 2 ren S NESTIN 16 249 MES a 1359 C04583 I6 2489 Maii Order Elecironics Wordwide ete MES92N 14 1 19 UA E OMS i 9 LMG407 12 75 M703CN 8 149 791 054 59 SER n 5 tM3AQT 15 75 LM7I0N i4 69 79M05AH 129 LM340T 24 75 LM7IIN M 79 ICLB038 14 395 CD408 16 68 C04077 W 35 cb472 6 119 LFM7N 14 149 LIMIT 14 49 LMI3080N 8 1 18 CD4029 5 79 CD4078 1 9 MCI4410 1 895 ELECTRONICS LM348N 14 89 LM733N 14 89 LMIJ600N 16 5
59. indications show at least dc shifts a rather specialized condition For our analog test we used a com bined NTSC color bar generator sig nal and a TV receiver to see what would happen Oscilloscope timebase NEW LITERATURE from page 77 minals All products are indexed by ge neric name and part numbers and a com plete price list and list of authorized Vec tor dealers is included For a free copy of the catalog write Vector Electronic Co 12460 Gladstone Ave Sylmar CA 91342 Used Equipment Catalog A 36 page il lustrated catalog in which are listed thousands of like new state of the art electronic instruments for sale has been published by Genstar REI Sales Prod ucts listed are by categories The nearly 50 categories cover such devices as ampli fiers analyzers calibrators counters desktop computers microprocessor de velopment and analysis systems oscillo scopes telecommunications equipment and much more Listed equipment is from such brand name manufacturers as Hewlett Packard Intel Tektronix Digi tal Equipment Corp Texas Instruments Fluke and many others All items listed are described including prices and are offered with full warranties For a free copy of thecatalog writeto Genstar REI Sales Co 6307 De Soto Ave Suite J Woodland Hills CA 91367 82 MODERN ELECTRONICS November 1985 was set for 10 microseconds per divi sion for this test with top and bot tom traces in Fig
60. marrow T ee ere Aom bas wre E ree mra LE EL nace Uoc eee coc oe amplifier section to Class A operation For signals requiring less than 20 watts per channel and that s most music most of the time the amplifier remains in Class A For those occasional brief peaks that require more instantaneous power the amplifier automatically reverts to Class AB As for tuner design innovations the Yamaha R 9 incorporates a circuit called Computer Servo Lock tuning This provision samples incoming signals and decides which of two tuning methods will provide best reception Local or DX setting can be manually selected as well and tuning though digital can be done in increments of as little as 0 01 MHz for FM and 1 kHz for AM The receiver measures 174 W x 16 D X5 7 H and suggested price is 799 Front Panel Layout Many ofthe less frequently used controls and switches of this elaborate receiver are hidden behind a hinged door flap so that the panel retains an uncluttered look Controls that are always visible include the Power on off pushbutton eight pre set buttons that in combination with a shift button and a Memory button are used to select up to 16 AM or FM sta tions in any combination six major function selector buttons with addi tional sub selectors for choosing AM or FM and Video or Video 2 inputs man w LOSS PP pa a ual selectors for cho
61. never great er than 0 3 dB in the Local mode and was down 1 5 dB at 15 kHz in DX We measured an excellent capture ratio of 1 1 dB in the Local mode while in the DX mode capture ratio increased to 2 5 dB as claimed by Yamaha Both i f and spurious response rejection mea sured 90 dB while AM rejection was 57 dB and alternate channel selectivity mea sured in the DX mode was 87 dB the lat ter a bit higher even than the 85 dB claimed by the manufacturer AM frequency response is plotted in Fig 2and extended from around 50 Hzto just over 3 0 kHz not very impressive for the 6 dB points Best signal to noise in AM measured precisely 50 dB as claimed while harmonic distortion at 309 modu Fig 2 Frequency response of AM tuner section of R 9 receiver ae eo B pe aeo A he oO cq A o tcc Frequency Hz IME D L b 1dB lation measured 0 35 for a 1 kHz mod ulating signal Amplifier Measurements In the Auto Class A mode the power amplifier section of the R 9 remained in Class A until output power into 8 ohm loads exceeded 20 watts at which point it smoothly switched to the more efficient Class AB operation Maximum output for rated THD was 144 watts per channel into 8 ohm loads for most of the audio spectrum decreasing to 136 watts per channel at 20 Hz and 139 watts per chan nel at 20 kHz In fact at rated output of 125 watts per channel THD at mid
62. of computer plus many popular peripheral and accessory devices With NRI training you learn at your own convenience in your own home You set the pace without classroom pressures rigid night school schedules or wasted time You build the Sanyo IBM compatible computer from the keyboard Z mn 7 wem usb z Your NRI course up with your own personal includes the Sanyo NRI instructor and the com plete NRI technical staff ready to answer your questions or give you guidance and special help whenever you need it Learn MS DOS Operating System Praised by critics as the most intriguing of all the IBM PC compatible com puters the new Sanyo uses the same 8088 microprocessor as the IBM PC and features the MS DOS operating system As a result you ll have a choice of thousands of off the shelf software programs to run on your completed Sanyo Your NRI course includes installation and trouble shooting of the intelligent keyboard power supply and disk drive plus you ll check out the 8088 microprocessor functions using machine language You ll also prepare the interfaces for future peripherals such as printers and joysticks 16 bit IBM compatible computer with 128K RAM monitor double density double sided disk drive and intelligent keyboard the NRI Discovery Lab teaching circuit design and operations a Digital Multimeter Bundled Spread Sheet and Word Processing Softwa
63. or ready the program will fill the screen with appropriate colors About the only complaint I ve got about the program is the need to switch disks including the use of the protected jignition disk I appreciate the com pany s zeal in protecting their program from copying but it is indeed a pain since disk switching is always required after the startup sequence In the program s favor is the high level of motivation it provides I appreciated the fine tracking of records the feedback that the computer provides on what you did versus what you hoped to do the au tomatic tie in with calories consumed and burned up the program customizing you can do and summary information it pro duces on screen and hard copy There s plenty of help screens at your fingertips too though this is quickly dispensed with as you familiarize yourself quickly with the program s operation You can also have a lot of fun with the program by setting up programs with in correct personal information just to see how the computer program responds It does indeed take into account the infor mation fed into it In all this is a very useful program for anyone intending to maintain fitness by running with an eye toward nutrition as well Its effectiveness will of course depend on the user s dili gence in maintaining the training sched ule prescribed or designed The program itself goes as far as it can which is com mendable ME November 1985
64. possibly us ing the closest existing mediumwave out lets on 640 or 780 kHz or on shortwave Australia Radio Australia has a long history of making decisions sure to dis please DX listeners The latest isthe elimi nation of regular DX tips from the Aus tralian Radio DX Club on the Talk back program It s a shame that so many stations not really qualified to broadcast accurate and timely DX tips do so while a station like RA which has ac cess to the necessary expertise chooses to pass it up Bolivia Those who would DX this country naturally think of 6 MHz or lower often out of band lots of lost sleep and straining through the static But there s one station active on the 9 MHz band audible in the middle of the day at least in Florida last summer when condi tions were most favorable it s Radio La Plata Sucre around 9716 kHz For instance on the 4th of July Bob Wilkner in Lauderdale Lakes found it peaking at near local levels around 1700 UTC dur ing a one hour period the frequency jumped around from 9716 2 to 9717 1 to 9716 3 as reported in DX South Florida Brazil Nine 250 kW transmitters have been installed at Radio Nacional Brasilia but despite little publicized relays of the VOA in Spanish and of Radio Suri name International nowhere near that many are ever used at any one time Other stations seeking a better signal in North or South America should approach RNB about using those facilities How
65. program takes less than 15 minutes to do During subsequent weeks you will have daily sessions This starts off with the coun selor s greetings of one sort or another The computer remembers how long it has been since you last met and might chide you for missing a session Then you will be asked to report your food intake since your last appointment Afterwards textual and graphic feed back will be displayed This is construc tive feedback on what you ve been doing Next a quiz will be given This quiz is in your most recent reading assignment in the manual Then the counslor will dis cuss an activity related to the reading Planning future meals and assigning new readings is next on the agenda After this is done you have a choice of whether or not to obtain printouts of graphs food reports and plans Finally a new ap Screens obtained while working with Scarborough s Original Computer Diet program Krpata er L NE B oa he iRE WOLF g tp ELECT ARAL ar quill The Grigioel forin Competer Biwi Holy siipi Whore hate woo hes ETE LESE EL 1 ami rires ee A jm LB S NI IL 72 MODERN ELECTRONICS November 1985 LE T a te I pointment is made The typical session lasts 10 to 15 minutes If there are any problems an extensive help section is in cluded and accessed easily The Original Boston Computer Diet is certainly a well thoughtout program easy
66. program leads the user step by step setting you up for doing everything except keying in your personal informa tion and ongoing records As with MECA s Managing Your Money program Disk 1 of 2 acts as an ignition key and cannot be duplicated A third disk is provided by the user to keep records on More than one person can use the system though everyone is required to use Disk 1 Part of the program is organized like a BMC PO SOUR Ok CORPORA Ow Uf KWERSCA JAMES ERIH THE RUNNING D FIOGRAM i Un m WHILE YOUR COMPUTER HELPS YOU SET FITNESS GOALS KEEP TRAINING RE CORD GRAPH PROGRESS AMD PREDICT RACE Diacs CONTENTS BRETTES USER 3 QUIE book with seven chapters including an Index Also an illustrated stretching feature is designed for users to warm up and train muscles before running to mini mize strains or other possible injuries After Chapter 1 s introduction the fol lowing chapter examines your present physical condition with a host of ques tions Basically these form the same tests given to me when I joined a health club including the Harvard Step Test In es sence this part of the program analyzes your overall health and lifestyle The next chapter helps you to set goals and reach them whether it s jogging three contin uous miles losing weight or training for a competition race Remaining chapters show you how to log your running times and maintain records graphing and ch
67. shorts out R7 and opens the line to the D U T This connects the volt meter directly to the bridge s output and removes from the measurement any device under test 3 Set the oscillator s level or am Fig 3 Shown here are impedance versus frequency plots for typical full range two way and three way speaker systems Note resonance peaks on each curve VOLTMETER 19 o error TTHTEHATHTHHHHAEAEHHH CHART RECORDER OPTIONAL recorder are optional If you wish you can connect a dual trace oscilloscope as explained in the text Maximum measurement range ohms 5 error 10 error 50 100 120 240 250 500 1000 plitude control for the correct volt age reading on the voltmeter accord ing to the value selected for R7 4 Set S1 to its alternate position Continued on page 84 b W Q z o m a H FREQUENCY pe Full Range ee Two Woy e Three Woy 52 MODERN ELECTRONICS November 1985 New Development Army Wrist Receiver The U S Army continually develops new electronic equipment Among the latest devices reports the U S Army Electronics Research And Development Command is a wrist worn receiver for Airborne troops that works in conjunc tion with a small transmitter that might be carried by a paratrooper leader or packed on top of equipment to be dropped Once on the ground the designated leader simply turns on the transmitter called a Drop Zo
68. the second half of 1985 UTC days Mon 0235 Life in Egypt Tue 0235 Egyptian Archeology 0250 Cultural Life In Egypt 0300 Between Egypt and America Wed 0235 Tourism in Egypt Thu 0235 Mod ern Egyptian History Fri 0205 Arab Poetry 0250 Egyptian Scientists Sun 0235 Stamp Collectors Club via John Tow Alabama Haiti Besides hearing Bolivia in the daytime DX South Florida members can do the same with the relatively near but rare station Radio Citadelle David Pot ter found it on 6154 6 between 1810 and 1930 in Creole One of the better heard Haitian stations on mediumwave is Radio Soleil 1170 Or was It s been subject to attacks and harassment for daring to op pose Pres for life Duvalier and in July the Catholic priests who ran it were ex pelled from the country Italy English from RAI has this fall schedule 0350 0410 on 11905 15330 17795 0425 0440 on 5990 7275 1935 1955 on 7275 9710 11800 2015 2045 on 7235 9575 11800 2200 2225 on 5990 9710 11800 and to North America 0100 0120 on 6010 9575 The last is surrounded by Italian also on 9630 9710 11905 Madagascar The most distant station on the 120 meter band you re likely to hear is RTM which unexpectedly reacti vated 2495 kHz in August Kenneth Hill in Massachusetts heard it from sign on at 0255 to fadeout at 0330 Mali Bamaki has appeared on 3380 kHz until sign off around 2400 appar ently replacing one if its 4 MHz channels it was fi
69. the Cable Companies tried to Ban HBO Movie Channel Showtime Descramblers Converters etc Suppliers list included 8 95 Cable Facts Box 711 ME Pataskala OH 43062 SOLID STATE a MULTI TURN POT RUMP EM pu SPECTROL TTL compatible e MOD 534 7161 1 00 paliza 5 00 EACH 10 for 9 00 TV REMOTE CONVERTER Enhance the versatility of your video equipment Converts cable AND VIDEO MODULATOR FOR T I COMPUTER LS TV stations to channel 2 or 3 CONNECTORS Re aa T i UM1381 1 Designed for use with T I com Etri 99XM182 low dam ET bliss Use 1 Can be used with video sources Built in ato give puters noise fan Measures your TV remote tuning capabiiit ALL ARE 1 56 SPACING we L AJB switch Channel 3 or 4 selection switch 3 squarex 1 deep z j 9 Capability 4 Operate on 12 vdc Hook up diagram included 21 cfm 23 db 1700 rpm onverter operates on ttSVAC gt A 75 00 VALUE 36channel selector with fine tuning ONLY 27 50 on25ft cord Not a decoder 4 SPECI TET TT TITTY ECIAL PRICE 12 50 each te 10 00 EACH
70. to use effective and inviting With the use of Artificial Intelligence the counselor s responses and perfect mem ory make the recording session fun This is half the battle won since discipline is vital in any weight loss program Using the program I was able to lose a few more pounds and maintain the loss easily Naturally one has to be motivated to lose much weight which I had already done previously Nonetheless I would say that the program has the capability of helping dieters achieve their weight loss goals and maintain much of the loss over a long period of time So if you re a weight conscious person you should place this program high on your list of software to buy The Running Program by James S Fixx MECA Westport CT Requires IBM PC XT AT or compatible computer with 128K or PCjr with 256K mono chrome or color monitor 80 col printer PC DOS 1 1 or later 1 DS disk drive min imum Two 5 25 DS disks 79 95 A neat free demonstration disk for this program came our way We tried it were favorably impressed and got the real thing The Running Program is a sort of personalized computerized version of the late Jim Fixx running program idea Therefore it s designed for people who either jog or plan to run whether to en hance physical fitness or for serious mar athon running The manual that comes with the soft ware package is short and sweet not to mention very clear Actually the disk ap plication
71. ve been doing it for over 50 years ha3lpmg For your convenience CIE will try to have a representative thousands of men and women get started n i CoOn act you there is no obligation electronics careers mE We offer flexible treining to meet your needs Print Name You can start at the beginner evel or if ycu already I O Apt know something about electronics you may want to start at a higher level But wherever you stet you ay ni etl can go as far as you like You can even earn your 1 Age Area Code Phone No I i i I I I I I I I CIRCLE 5 ON FREE INFORMATION CARD The Siliconnection A new book by Forrest Mims examines the silicon connected modern age of electronics through his personal involvement in it By Art Salsberg icroelectronic life is largely based on a raw material called silicon the second most abundant element in the earth s crust Using special refining meth ods this semiconducting material has changed the face of electronics dueto itslow cost and miniature size Starting with the development of a transfer resistor at Bell Laboratories called a transistor and evolving to an integrated circuit in the late 1950s it has revolutionized our lives through a host of affordable con sumer electronics products from digital watches to computers Silicon s impact on society is so strong that an area of the U S where many semiconductor developers gathered is called
72. vertical or horiz oscillator RED SHORT LIGHT means either the flyback the HV multiplier the vertical output horiz driver or one of the R B G output transistors is shorted GREEN NORMAL LIGHT means the TV set s entire flyback circuit is totally free of shorts It also means that it is safe to power up the TV set with the run button so that you can look for open circuits by observ ing the symptoms on the CRT screen FEATURES All start up circuits and all horiz drive related shut down circuits are automatically circumvented by the Mark III during all test and run functions During the test function all flyback Secondary output is limited to approx 80 of normal 2nd anode voltage is limited to ap prox 5 KV This means all circuits that are not shorted will have some 80 of their normal B voltage during the test phase It also means that any shorted circuit will have zero DC volts on it This feature makes any short easy to isolate The MARK Ill sells for only 595 Visa and Mastercharge Welcome Diehl Engineering 6661 Canyon Drive F Amarillo TX 79110 Phone 806 359 0329 or 806 359 1824 CIRCLE 99 ON FREE INFORMATION CARD C THE MARK V HV CIRCUIT ANALYST Checks the horiz output stage for opens shorts Checks flyback yoke PC and HV mult Checks all scan derived B sources Checks for open safety capacitors Checks for open ground path for horiz output stage Checks
73. well Figure 2 shows the risetime and fall time along with symmetry For this test we used a 60 MHz scope and ob tained an 18 nanosecond reading Plugging this figure into the formula Bandwidth 350 T jisetime 350 is a constant we obtain 350 18 19 44 Test Equipment Tektronix 106 Square wave generator Hameg Model HM 605 oscilloscope Tel equipment Model D67A oscilloscope Data Precision Model 935 multimeter B amp K Precision Model 1260 NTSC color bar generator Model 1653 ac power supply Model 3020 tunction generator RCA CTC 92 and CTC 131 television receivers and Tektronix C 5C camera and Polaroid 107C film November 1985 MODERN ELECTRONICS 81 PRODUCT EVALUATIONS Global Specialties Scope continued MHz which substantially confirms Global s 20 MHz bandwidth figure Continuing with digital responses we obtained the traces shown in Fig 3 this time showing the trigger input at the top of the display as differen tiated pulses turn on and off square waves Observe that very sharp rise times and falltimes continue through out the display and that everything is precisely in sync We did encounter some problems in setting the precise trigger level for the fourth waveform due largely to the disparity in repetition rates be tween the smaller and larger rectang ular pulses But as Fig 4 shows even a 16 difference in rates 2 cycles per division as opposed to 1 cycle in eight EDITORIAL
74. you can use this figure in any calculations If the gain is not known you can place a resistor of known value across the measuring terminals of the bridge and calibrate from that Note in Fig 1 that no value is spe cified for R This is because the value used will depend on the output signal amplitude from your signal generator To determine what value resistor you need refer to the Table The first column of the Table lists typical oscillator output levels in peak to peak p p voltage Column two tells you what resistor value is needed at each output level By the rules then if your generator outputs a l volt peak to peak signal the value of R should be 1000 ohms for a 2 4 volt output R would be 2400 ohms and so on Columns three four and five of the Table tell you the maximum im pedance that can be measured for each oscillator output resistor value combination at 1 5 and 10 bridge error respectively Notice that to measure impedances of several hundred or more ohms an oscillator with greater signal output level and a higher value resistor are needed If you want to measure higher impedance then your oscilla tor s output will usually have to be boosted with an amplifier capable of reaching the required level and use a higher value of resistance for R It is not necessary for the amplifier to have an especially low level of distor November 1985 MODERN ELECTRONICS 51 OSCILLATOR
75. your telephone set and your tele phone wall outlet using standard RJ11C telephone connectors It re quires external power from a com monly available 9 volt dc adapter It won t interfere with normal tele occurred to me one day while phone operation and it can be used with rotary or Touch Tone dialers When someone calls the Mello Phone automatically disables the bell in your telephone and replaces it with a musical tune that plays repeatedly until you answer the phone or the caller terminates the call In the latter case the Mello Phone will play the current tune through to completion and then stop automatically Circuit Description As shown in Fig 1 the Mello Phone uses only four ICs Here U and U2 are opto isolators U3 is the music 36 MODERN ELECTRONICS November 1985 synthesizer and U4 is an EPROM for storing the music The music synthe sizer is a General Instruments AY 3 1350 microprocessor Operation of the Mello Phoneis as follows Firstly P1 plugs into the tel ephone outlet and your telephone plugs into JJ Now when a 20 Hz ring signal of 40 to 150 volts is present at the tip and ring leads green and red leads of P current flows through R 7 C6 D6through D9 D and opto isolator U2 The current through pins 1 and 2 of U2 causes pin 5 to go low to signal a start tune re quest from the synthesizer via Q2 Diodes D2 through DS form a 5V
76. 0 K data interface at 259 00 each gives you control of the SX 400 scanner and RF converters through a computer Add 3 00 shipping for each RF converter data interface or antenna control box If you need further information on the JIL scanners contact JIL directly at 213 926 6727 or write JIL at 17120 Edwards Road Cerritos California 90701 U S A SPECIAL JIL SX 200 K List price 499 95 CE special price 159 00 Muiti Band 16 Channel No Crystal Scanner Frequency range 26 88 108 180 380 514 MHz The JIL SX 200 scanner tunes military F B 1 Space Satellites Police andFire Drug Enforcement Agencies Defense Department Aeronautical AM band Aero Navigation Band Fish amp Game Immigration Paramedics Amateur Radio Justice Department State Department plus other thousands of radio frequencies most other scanners can t pick up The SX 200 has selectable AM FM receiver circuits tri switch squelch settings signal audio and signal amp audio outboard AC power supply DC at 12 volts built in quartz clock bright vacuum fluorescent blue readouts and dimmer dual level search speeds tri level scan delay switches 16 memory channels in two channels banks receive fine tune RIT 2KHz dual level RF gain settings 20 db pad AGC test points for optional signal strength meters Regency HX1000 K List price 329 95 CE price 209 00 6 Band 30 Channel No Crystal scanner Search Lockout Priority Scan delay Side
77. 1 or MT2 Since the ac line voltage passes through zero effec tively removing the voltage 120 times every second there is no need for a manual device such as a switch to interrupt the voltage This being the case we only have to add to our circuit the elements required to turn on the triac Since the voltage on the ac line passes through zero every half cycle the duration of the current going through the load at SO depends on just where in the cycle Q4 is triggered a November 1985 MODERN ELECTRONICS 45 a a en eee into conduction Early triggering produces bright light while late trig gering allows the lamp to shine less bright The task of triggering Q4 into conduction at the desired point in the cycle falls to the circuit made up of bi polar transistors O and Q2 and uni junction transistor Q3 Unijunction transistor Q3 oper ates as a relaxation oscillator whose output pulse frequency depends on how fast capacitor C2 recharges after firing Transistors O and Q2 furnish the charging current with the R3 C and R R2 CI time constant net works controlling the turn on and turn off times You can tailor the circuit to your specific needs in either or both of two ways If you want the lamp to turn on faster simply change the value of R3 either by using a lower value resistor or by paralleling
78. 1 yF electrolytic C6 0 47 nF 250 volt metallized Mylar C7 C8 0 1 yF disc C9 0 22 yF disc Resistors 4 watt 10 R1 120 ohms R2 680 000 ohms R3 6800 ohms R4 270 000 ohms R5 R6 R7 R14 R15 R16 R21 100 000 ohms synthesizer bridge circuit that allows only a dc signal to flow through the telephone during incoming ringing This effec tively disables the normal bell or chirp ringer in your telephone since they require ac to operate Zener di ode D prevents stray current surges such as those that result from other pulse dialing telephones on your line from triggering a tune Mello Phone will play the selected tune until the telephone ts answered or until the song is over While the song is playing subsequent ringing bursts will not reset the tune When the tune ends the next ring burst will restart it beginning a new cycle When the telephone is answered dc flows through bridge circuit D2 through D5 UI and out to the tele phone via the red and green leads of JI The current through pins and 2 of UI pulls pin 5 low resetting the synthesizer and stopping the tune Answering the phone resets the pro mme 73 2USERTOTOO o CX Y s U u PG I n 5272 R8 R9 R13 33 000 ohms R10 R19 R20 4700 ohms R11 R12 10 000 ohms R17 3300 ohms R18 10 000 ohm upright pc mount trimmer potentiometer Miscellaneous JI RJ11 6 positi
79. 1295 TMS 716 24 2048x8 450ns 3 voltage 795 7T4HC32 4 79 74HC165 16 215 T4HC374 20 2 69 7ALS42 16 49 7TAS165 16 89 7TaLS374 20 149 8035 4 MPU 8 Brt 495 2715 94 2048x8 4500s 3 95 74HC42 16 00 J4HC166 16 2 49 TAHCS9Q 16 1 59 74S47 16 8 T4LS168 16 119 74 8375 16 88 8039 30 CPU SQ Chip 881 128bis RAM 495 27C16 24 2048x8 395 7aics1 m 89 74HC173 16 129 74H0393 4 159 T4LS51 W 29 7415169 6 1 49 74LS356 14 ag 8060 49 CPU 8 811 NMOS 12 95 2716 1 24 2048x8 350ns 495 74HC58 M 89 74HC174 18 1 09 T4AHC533 00 2 69 7ALS73 l4 39 74L5170 16 1 49 74 9393 l4 1 19 BO73N 40 CPU wiBasic Micro Interpreter 29 95 27150 5 24 20488 550ns 375 74HC73 M 79 74HC175 18 109 74HC534 20 2 69 7as7a M 49 yaS73 e 89 74539 ais 149 BORDA w CPU 305 ois o Ill um a25 zaczi w TO acio is isa 74dc505 38 319 74875 16 45 TASA 15 69 TaS40 w 195 8085A 40 CPU 395 27908 0 a M GERD 2e vcr o 099 eie i 159 74MC 88 0 359 74LS76 5 239 5A 2 40 CPU 8 Bit N Channel SMH 2752A 25 M 4096x8 250ns 21V 9 95 745175 16 69 745533 20 195 808 B 5MHz 0 95 4HC76 1 TaHC4028 14 175 7 2732A 45 24 4096x8 d50ns 21V 449 74HC 6 16 79 TaHC192 16 149 4LS85 16 89 74LS181 44 249 745534 20 195 8086 2 40 CPU 16 bit BMH 19 95 27032 24 409618 CDS 1195 T4HC85 16 169 74HC193 I5 1 49 T4HCA040 16 1 49 741586 1 39 74 190 18 79 74 S540 90 149 8087 40 Anthmetic Processo
80. 149 LM392N 8 59 f tes j A MC146818 24 Real Time Clock Plus RAM 795 AY 5 1013A 40 30K Baud UART TR1502 LM320K5 135 LM393N 8 45 m h iB CO4507 M 119 Wire Wrap Ke V39N 0 395 ypgrrp 1 95 CD4508 M 195 j m s LMG20K 24 ge Mm 395 LM2878P 295 CO45 10 18 B5 Sockets LFa120N 6 1395 TENE LM320T 5 B5 LM290IN M 19 CD4511 16 85 i Gold Level 3 LM3201 12 B5 TLAS4CN 16 279 qe T D CD4512 18 BS 3 Soldertail Gold Standard patua 19 1099 100 09 LM320T 15 85 TL496CP e 158 CD4514 M 149 Low Profile Tin Sockets pano 1g t0 Oe LM320T 24 85 nessiv a tz PWN u 249 CD4515 24 149 Fat No 19 1099 iw apnww 55 49 45 Header Plugs Gold LM2317N 8 195 Pari No 19 1999 up LM322N 14 149 NE540H C54 295 CD4515 16 89 LL BpnS6 39 35 29 Dom WW 59 5 59 an 19 i999 Vw LM323K i95 90H 2 LM3900N 4 59 CD4518 16 a9 BpnlP 16 14 13 14 pin SG 49 45 39 1 pn WA 75 59 65 a_a NE544N d 195 l pnHP 65 59 55 LM324N l4 59 LM3905CN 6 4 19 m QD4519 6 59 t4pmlP 17 15 14 16pnSG 55 49 45 j l165pnWW 79 72 p M32907 65 NE550A 14 195 CD4520 16 8 16pn LP 19 1 16 18 pin SG 65 59 51 18 pin WW 95 85 JA i amp pnHP 63 65 59 LM33IN a 3 95 NESSSV 8 E LM3909N 8 83 CD4522 16 169 pnlP 26 24 23 20pnSG 75 65 59 20pnWWi 9 109 95 Mp HP 115 99 69 M2347 119 ee E Qu C04506 16 119 Op LP 30 27 25 22pnSG 79 6 6 amp 5 22nnWW 29 119 105 Head M 128 XM555 9 569
81. 2 DACOR32LCA 4 06 B 0637 g Wattage Rory 1 Wan 2 wen DACTQOLCN 10 50 Bm Jes20 j Mex Working Voltage 350v DAC 022LCN 7 00 puni Rated Amant Temp FC 4 T1 MJE712 x i Opereung Temp Range SEC to Intertace MJE722 r MJEBO3 MPF102 MP52222A MPS2368A MPS2977A MPSX392 MPS3395 MPS3563 MPS3565 MPS3638A MPS3641 MPS3643 MPS918 MPSA13 TIP112 TIP117 4116 2 nsec T6 388K O Ram TIP120 TIP 122 Price Pur Pok DI Part Mo amp R v BIZ TIP127 TIP132 41168N ND 1512 5712 21500 90640 TiP135 5290N NO 1512 6712 21500 80640 TIP29C Prica Each 189 175 168 5 1 TiP30C Pm TiP3IC r rIP32C MN4164 15 64K DRAM 150NS TIPS1C THPG2C y a Vee BRN iid c AHN io RUBPASBRSBSSSIRRVBSE Ni N Ons 7A191N 74192N 74193N 74194N 74196N 74197N 74198N 74198N PESFINBVSRBV a 2i uwou u B38 SSgSS 28598 Bisievs 8 E iv 0 22d O o BBReP asc ewe SESsREBSSLELE NSA A2 GO aw MM ma gt 59k TAHC373N TAH CSN 7AHC39UN 74H C383N SRS RASS SNESE 1 F4AACN LF13741N LMIOCLN E TXI85288Ndd SUIL EXRSBESSARITY SBPGNGZATB BEBE uc5REGIAdEGSEEESE New aN ma m f a Nm RRIRZ BEESBRHESUE Dimension L 130 170 Dimenseon O 45 55 Owmenson d 068 08 6 Mats Onde Fim Vslues in Ohms 0457 to 10M How To Order Take any standard value lie 1 SK and add s W for 1 wont or add a W2 for 2 watt he 1SKW1 tor 1 5KQ 1 watt this ie the DigeKey part number Pricing 1
82. 20 When used with an Interlink Electron ics force sensing resistor this program emphasizes the low range of joystick values from about 3 to 15 The following program permits an FSR to move a dot back and forth across the Screen 10 SCREEN 1 20 CLS 30 X STICK 0 40 X 10 X 50 Y 20 60 PSET X Y 70 PRESET X Y 80 GOTO 30 since the FSR works best with low joy stick numbers line 40 multiplies the re trieved value by 10 This provides the x coordinate for a horizontal line across the computer s display As the FSR is alter nately squeezed and released a small dot moves back and forth along this line in 10 pixel increments If you have a Color Computer you can connect one or more pressure sensitive resistors to its joysticks if you first add a single fixed resistor in series with each sensing resistor Connect the free end of one resistor to 5 volts available at the joystick port and the free end of the re maining resistor to ground also available at the joystick port The junction of the two resistors then becomes the voltage di vider output for the CoCo joystick port The value of the fixed resistor depends New from B amp K PRECISION Auto manual ranging DMMs s75 Modeli 2806 a Autoranging on volts and ohms amp Manual ranging on amps amp 0 7 DC accuracy a 500 hour battery life Continuity test beeper Diode check Transient and overload protected High energy fuse Model
83. 25 SN74181N 24 195 diagram os the application lpo SN7422N M 59 SN74100N 2 195 SN741B2N 16 105 MICROPROCESSOR CHIPS DT1050 Digitalker 29 95 ea SN7423N 18 68 SN74105N M 139 SN74184N 18 229 Part No Pins Funcbon Pris M m ER del SN7425N 14 39 SN7410 N 14 29 SN74185N 96 229 D765AC 4D Floppy Disk Controller 16 95 n k cud 1300s 99 MM54104 Processor Chip 12 95 ea SN7495N 14 39 SN74 0N 16 39 SN74190N 16 69 03242 28 Addi Mulliplexes amp Aetesh Counter 7 95 46N po eu 149 SN7497N M 25 SN74116N 24 i GNAISIN o BS TMS5501 40 Synchronous Data Interface SIRO 1495 nus i5 eed dre 139 pes DT 1057 ccpands me 011050 vocabulary from 137 to over 250 worte Inci 2 ROMs ane specs SNM2NN nmo 59 RUN m SN74192N m gg 280 Z80A 280B 28000 SERIES 5115825 16 16384x1 250ns 6 554 Part No DT1057 2195 ea SN7430N 4 45 SN SN74193N 16 69 ZB0 AD CPU MK3880N 780C 2 5MH2 275 4164N 150 16 65536x1 150n 122 9510 95 SN74123N 16 55 i 280 CTC 28 Counter Timer Circuit 349 M696200 t6 65536x1 200ns 118 395 INTERSIL SN7432N 14 39 SN74 125N 14 49 SN74194N 16 69 Z80 DART A Oval Asynchronous Rec Means 895 MM5261 n 1024x1 300ns 3 35 Bi195 i SNI43N M 29 SN7a1260N 1a 49 SN74 05N 16 49 2eoDma 40 Drect Memory Access Crcut 1249 122575 S du Geen 3 15 genes TWIN SNT43N M 25 suus M 79 SN70908 u 75 780 P10 aD Paral 1 0 i
84. 3 27500 16 256xt B ns LP x 195 74HC HIGH cM CMOS S09 M 35 74SMB 16 179 74529 16 349 9 2 25d Slate RAM 275 7489 uM a SiO1 225 zac u 7aHC139 105 1 7ALSiD ITI 35 74 S151 16 59 74LS280 4 195 68810 24 128x8 Static RAM 2MHz 595 74C921 18 256x4 B 5 95 JARCO M a 74HC147 l 1 SE 16 99 74S MW 3 TASI3 5 2809 3 5 6821 4g Peripheral Inter Adapt MC6820 275 74C936 18 1024x1 250ns CMOS 6518 5 95 5 29 7440053 16 109 magia 14 59 passa M 129 asaz z 39 ees 2 ome M 134 DN uU SIL 295 I ie so cua ie so TS e 9 7 LS20 14 29 5 40 CRT Controller CRTC 9 95 1 Am x P mS S men pe m omego 1i mh o d me Sek GE aer 8 B eso 7m emos os 74LS26 Ww 29 74515 18 69 7AS353 16 108 ycten tus Comm Raaer 25 74HC1 7aHC273 m 279 EE i edens H 50 TAHCIS8 16 99 E LN uum 16 x SM m UN OE oo PM MODEM os 1702A PROMS FPROMS 395 Hnc o ga vium wo 13 18 1a 339 Hem wu m ae i p br 15 9 GRABRP amp Q General Purpose int Adapter 995 TMS2516 24 2048x8 4500s 495 7sHC14 M 89 T4HC161 16 138 erre 2 Hp MW 3 pastes Ww e raser 16 ag 900 0 Enhanced Prog Comm merace 2661 895 Meese M Bioma Miel wes neo mo so rece e 09 DOS le 23 MS M 3 74LS163 15 69 zasa 6 49 8000 80000 SERIES zo E laio 395 zac 1 69 T7aCig M 35 748CN3 0 269 744 538 4 39 7AS164 M 898 7445373 20 14 49 8031 40 Control Onented CPU w RAM amp VO
85. 35 00 three years 51 00 l oreign one year 21 00 two years 39 00 three years 57 00 Foreign Air Mail one year 74 00 two years 145 00 three years 216 00 Entre contents copyright 1985 by Modern Electronics Inc Modern Electronics or Modern Electronics Inc as sumes no responsibility for unsolicited manuscripts Al low six weeks for delivery of first issue and for change of address Printed in the United States of America Postmaster Please send change of address notice to Modern Electronics Inc 76 North Broadway Hicks ville NY 11801 M SEEN UE Radie Shaek Part Plaec The Builder s Store Over 1000 items in Stock Add Synthesized Speech Output to Your Computer Timer IC Project Book and Parts meme 2 d 3 mop i Audio mte Voice Synthesizer Text to Speech IC Amp 1 Voice Synthesizer IC SPO256 AL2 Uses sizer above Makes it a snap to add voice output programming stored in its built in 16K ROM to to virtually any personal computer or synthesize natural sounding speech Easy to in ASCII terminal 40 pin DIP with complete data T 9 terface with most microcomputers Requires low schematics Requires 10 MHz crystal available O9 1 1 5 cost support components and 3 12 MHz clock through Radio Shack 5276 1786 16 95 crystal available through Radio Shack 28 pin Timer IC Mini Notebook Learn how to use the versa DIP with detailed specs and programming data 3 Au
86. 5 Stereo on off switch a Stereo Mono switch the Record Out selector switch and a switch for selecting MC moving coil or MM moving magnet cartridge preamplification when the main Phono selector pushbutton is depressed The hand held wireless remote control while not able to perform all of the con trol functions found on the front panel it self is able to handle program selection power on off selection of any one of the 16 preset AM or FM stations audio mut ing and volume adjustment If you wanted to use this receiver as an audio video home entertainment control center you might connect all of the fol lowing components to it a pair of video cassette recorders VCRs one of which could just as easily be a videodisc player a TV monitor it must be equipped with a video input jack connection via the an tenna input will not do a compact disc player a turntable equipped with either a moving magnet or a moving coil cart ridge a compact disc player two audio tape decks and three sets of loudspeakers As many as three sets of speakers can be connected and activated simultane ously by the front panel speaker selector switches but if that is done only the speakers connected to the Speakers A terminals will have their voice coils direct ly across the output stages of the amplifi er Those speakers connected to Speak ers B and Speakers C terminals will be operated in series so as t
87. 728 7900 438 5888 BELLEVUE WASH TORONTO ONT CALGARY ALTA WAHL CLIPPER CORPORATION 881 8191 977 7692 235 5300 2902 Locust Street Sterling IL 61081 815 625 6525 MONTREAL QUEBEC DOWNSVIEW ONT VANCOUVER B C i122 ON FREE INFORMATION CARD 74SC374 D Type Flip Flop Non Inv 74SC533 Transparent Latch Inverted 74SC534 D Type Flip Flop inverted 74SC540 Octal Buffer Line Driver Inv 74SC54A1 Octal Bufter Line Driver N I 74SC563 Transparent Latch Inverted 74SC564 D Type Flip Flop Inverted 74SC573 Transparent Latch Non inv 74SC574 D Type Flip Fiop Non Inv Data Book For All Above 4s 250 Cypher IV Micro Controller Kit 129 50 4 MHz 8 Bit Microprocessor NAT 1NS8073 e Control Basic Interpreter On Chip Auto Start Operation At Power On Fast 16 Bit Muttiply And Divide RS 232 Supports CRT amp Serial Link 24 Bi Directional I O Lines 8255A RAM Memory 2K Expandable To 16K Eprom Memory Expandable To 16K Built In Eprom Programmer Parr Centronix Printer Interface e Optional Real Time Clock W Backup Pay TV Hardware Installation Kit Blow Out plow As 2 95 3 50 Shipping Per Unit All Kits Contain 5 F Connectors 300 to 75 OHM Balun 300 OHM Terminal Block 2 Ft 75 OHM Patch Cord 2 Ft300 OHM Twin Lead Nylon Cable Ties And UHF Antenna Model 41 24 2 95 Includes All Ot The Above Plus 25 Feet Coaxial Cable And Mounting Hardware For Indoor Wall Ceiling Installation Model 4880 2 95 Includes All Of The
88. 765 15430 15345 15330 18805 11790 9700 9590 9530 6030 She s not on AFRTS but Dr Ruth Westheimer has attracted quite an au dience with her live phone in Sexually Speaking Sunday nights at 10 pm EDT EST via NBC If she s too tame for you try the competition Sex Talk at exactly the same time but run ning longer on clear channel WLS 890 kHz out of Chicago More and more AM stations are going stereo some with big fanfare some with out And surprisingly a lot of them are news talk stations wherestereo is moreor less irrelevant CBS news station KNX 1070 Los Angeles turned stereo on April 29 Listeners such as Steve Mittman re porting to IRCA knew about it before most people at the station did Another major AM station WCCO 830 Min neapolis issued a press release four months ahead of its stereo conversion on Oct 2 its 61st anniversary although partial stereo before then caused stereo indicators to light up If you re in California you don t necessarily have to listen to shortwave in order to hear Radio Venceremos the clandestine from El Salvador Mike Hardester found out that the left leaning Pacifica station in Berkeley KPFA 94 1 includes Radio Venceremos in its drive time magazine Traffic Jam Mondays at 5 30 pm PST PDT Good listening NE The latest technical books and lit erature in the electronics and com puter field Standard Radio
89. 8 988 7000 Hitachi 2210 O Toole Avenue San Jose CA 95131 408 942 1500 68 MODERN ELECTRONICS November 1985 Intel Corp 3065 Bowers Avenue Santa Clara CA 95051 800 672 1833 Jensen Tools 7815 South 46 Street Phoenix AZ 85040 602 968 6231 MAD Magazine 458 Madison Avenue New York NY 10022 212 752 7685 Motorola Semiconductor Box 20912 Phoenix AZ 85036 602 244 6786 Monolithic Memories 2175 Mission College Blvd Santa Clara CA 95054 408 970 9700 MWS Wire Industries 31200 Cedar Valley Drive Westlake Village CA 91362 818 991 8553 National Semiconductor Corp 2900 Semiconductor Drive Santa Clara CA 95052 408 721 5000 Plessey Solid State 3 Whatney Road Irvine CA 92714 714 951 5212 Scan A Matic Route 5 West Elbridge NY 13060 315 689 3961 Howard W Sams 4300 West 62 Street Indianapolis IN 46206 800 428 SAMS Seimens 800 Hoyt Street Broomfield CO 80020 303 469 2161 Silicon General 11651 Monarch Street Garden Grove CA 92641 714 892 5531 Synergetics Box 809 Thatcher AZ 85552 602 428 4073 Texas Instruments Box 5012 Dallas TX 75265 800 232 3200 UPC Council 7057 Corporate Way S 106 Dayton OH 45459 513 435 3870 m Wire Industries that gives technical infor mation on the various sizes and grades of magnet wire and its insulation How can I do an Isometric Drawing Why with Applewriter on a
90. 80 00 all plug directi EA equipment 100 tor 80 00 into 120 vac INPUT 14 25 vac Q 1 amp SPECIAL PRICE 1 00 each Outlet ie j OUTPUT Q DN 4PDT RELAY STANDARD JUMBO D PS T LIGHTED 5 vdc 200 ma DIFFUDED T 1 2 ROCKER SWITCH SN 5s 5 aoi mili 5 ips 14 pin KH style RED 10 tor 1 50 115 vac lighted rocker 4 VDC 70 ma ien 3 amp contacts 100 for 13 00 snap mounts in 6 VAC 500 ma USED but fully GREEN 10 for 2 00 Ta x ta hole 6 VOC Q 750 ma 6 50 13 8 VDC REGULATED POWER SUPPLY tested 1 70 each 100 tor 17 00 Orange lens 16 amp 9 VDC 500 ma E 2 Specify cou voltage desired YELLOW 10 for 2 00 contact 24 VAC G 2S0 ma 3 00 7277777777 These are sod cm fy iori s vdc crane y 100 for 17 00 1 50 MULTI VOLTAGE 500 ma CHT CES eee OE OUR SIC m E MINI PUSH BUTTON construction fuse protection and L E D power FLASHER LED 3 4 12 6 7 2 9 0r 12 VDC 7 50 P indicator UL listed SOCKETS FOR KH RELAY S PS T momentary n 75 each 5 volt operation normally open 2 amp constant 4 amp surge 18 00 each red jumbo T 134 Ya bushing SiZe 1 00 each Red button 3 amp constant 5 amp surge 25 00 each 35 each SER 7 CONDUCTOR SWITCH jumbo T 13 size KEY ASSEMBLY NC S as RIBBON CABLE rss LED HOLDERS e E 5KEY N Pomona 2104 f as niia ef B Two piece holder a 1 00 each ty for jumbo LED contains 5 singie pole normally 10 for 65 100 for 5 00 open switches Measures
91. AL ORDER SERVICE No Minimum Order No Postage Charge Really Convenient Save 10 2995 gu m Compact Size m Easy to Use N m Fused and Overload Protected m Diode Semiconductor Test Mode 4 Step up to digital accuracy and the convenience R 1 of full auto polarity operation at big savings The 3 If the IC or semiconductor you need is not part of our regular stock our store manager f will check our new in store substitution guide f and then special order a replacement from our warehouse Your order will be sent to your Radio Shack store and we ll notify you high contrast liquid crystal display features low battery and over range indicators Measures up to 1000 volts DC 500 volts AC 2 amps DC and 2 megohms resistance There are four ranges for each function Includes test leads owner s man when it arrives There s no postage to pay or ual and spare fuse 53 16 x 31 4 x 17 16 Batteries other extra charges for this convenient ser extra 22 189 Sale 39 95 vice Visit our store near you for details Protective Case for Above 422 153 5 95 Over 1000 items in stock Binding posts Books Breadboards Buzzers Capacitors Chokes Clips Radio Shaek Connectors Fuses Hardware ICs Jacks Knobs Lamps Multitesters PC Boards Plugs Rectifi ers Relays Resistors Switches Tools Transformers Transistors Wire Zener Diodes and more A DIVISION OF TAMON KORTER ANGA Prices apply at participa
92. Above Plus 25 Feet Coaxial Cable And Attractive Expandabie Pole U Bolt For Easy Indoor installation Model 4845 3 95 Includes Al Of The Above Plus 65 Feet Coaxial Cable And All Necessary U Bolt Hardware move 705 Digital Multimeter I Gema e Se DC voltage 100p Y to end AC Volta 100y4V 10 750v Dc CUI ERT Gun 10 10A 51 95 AC Current 0 1HA 10 10A Hi Lo Resistance 0 12 to 204 Q Capacitance 1pF to 204F Diode Test forward voltage testing Hee test transistor lesting UHF TV PREAMP As featured in Radio Electronics March May articles 1982 This inexpenSive antenna mounted pre amp can add more than 25 dB of gain to yout SyStem Lots of satisfied customers and repeal orders for this high quality kit which includes all component parts PC BD Case Power Supply and Balun 34 50 Assembied Version 5750 Terms MICRO MART accepts Visa MC and telephone COD s Minimum order 10 00 Smipping U S orders 2 00 Canada and ather countries 3 50 includes inS Shipping rate adiusted where applicabie NJ residents add 6 sales tax MICRD MART 508 CENTRAL AVE WESTFIELD NJ 07090 201 654 6008 November 1985 MODERN ELECTRONICS 21 Radar Detectors A guide to automobile radar detection equipment and methods By Ron Cogan ou re moving along at a mod erate pace in your car one eve ning barely nudging the post ed speed limit of 40 mph while traver sing from Florida s east coast toward Tampa an
93. BASICs Under a sec tion titled Adding the Frills you learn about color and graphics translations from other BASICs and the MS DOS op erating system A communications primer hardware reviews and a discussion of users groups brings in the outside world This is fol lowed by practical applications includ ing a simple Speed Letter word process ing program atelephone toll charge pro gram and a binary banner program The last five chapters are devoted to business and professional programs These in clude an IRA financial planner mortgage amortization investment evaluator mailing labels and simple invoice pro grams All major programs are on the op the ACE Board 100 series breadboard ing system For a free copy of the A P Product Overview Catalog write to AP Products Inc 9325 Progress Pkwy P O Box 540 Mentor OH 44060 Packaging Catalog Covering everything from Apple II prototyping boards to VME prototyping cards Vector Elec tronic s new 66 page catalog describes 705 electronic packaging breadboarding and prototyping items Special sections are devoted to circuit boards racks and cages with motherboards connectors terminals accessories tools and bread boarding equipment An eight page sec tion covers prototyping boards for VME Wi BOOKS IREE tional disk though complete listings are given in the book should you wish to key them in yourself The PC SIG Library PC Software n
94. CUB II does not include SUB CUB II Counter module DATA SHEET 12 00 Strip of 40 pins with singte i TEST tunctions 3 ou e a Tin p ated buttons P C board unplugs for bread board work 1000 72 1 99 100 1 09 90 500 82 Stock No 51075 10850 Description 1 10 3 2a9 5 5 958 5 50 4 dig 5 5 95 5 50 MICRO Charts 4 dig 11 90 11 00 charts eliminate the need to MORE through manuals and summaries Fully decoded instan ed m access totally Comprehensive Gives 1 pin outs Cycle times buy notes etc et 5 p e E Stock No Relerence The Battery Just Wrap Tool colorful 8 x New battery powered Loo wraps insulated f wire around 025 square posts without need tor pre Cutting and pre stripping Complete with bit and 100 ff 30 AWG wire Stock No Description Price 13340 Battery just wrap tool with bit and 00 30 AWG wire PIN FORMING TOOL puts IC s on their 59 95 13341 Replacement bit 10 35 13342 100 Tt blug replacement wire 7 54 13343 1 00 white replacement wre 7 54 13344 1001 yellow replacement wire 7 54 13345 100 It red replacement wire 7 54 OK MACHINE AND TOOL 6502 65XXj 8048 and relatives 54 7400 TTL Pinauts Basic Algorithms 8086 B080A 5 95 How to generalize from a sample 5 33 5 9 23018 Wordstar SOCKET WRAP ID 600 centers Put device in tool and squeeze NEW Stock No Price Hand Tool ANTI STATIC MODEL 10200 14 95 THERMOPROBE i
95. Converter 0 78 Lin LM305H 99 LM38OCN 8 109 LMIB71N 18 295 74F240 amp 0186 68 High Integration 16 Br MPU 19 95 DACOBO7 16 8 Bit D A Converter MC1408 7 LMA7CN 8 49 LMGHEN 14 89 LM1872N IA 325 a B UB 80188 68 High integra 16 Ba MPU 8 Bit Data Bus 4995 DACOBOR 16 8 Bu D A Converter MC1408 8 UMODRCN 8 LMGE N i 179 80287 40 Numeric Processor Ex 19500 DACO830 20 B Bt Up DIA Conv 05 Lin 1 LM1877N 9 14 295 7420 6 17 SPECIAL FUNCTION DACO83 T Up DIA Cony 10 Lin ut XL sem a t5 74F257 08 179 DAC1000 34 10 Bit D A Conv Micro Comp 0 0594 LM3 1 95 LMGBAN 181 95 LMIG96N uo d 73F280 w 169 f MCMTOR IH Floppy Disk Read Amp System 495 DACIODB t 10 Bit D A Con Micro Comp 0 209 UB 8 3 LMG86V 3 8 89 3 74F373 20 489 MM5321N 16 TV Camera Sync Generator 995 pacigz2 16 10 Bd D A Come 0 20 in LM312H 2 79 LM3B7N 8 139 LM2002T 195 14F374 MM58167AN 24 Microprocessor Real Time Clock 895 DpAc1222 18 12 Brt D A Conv 0 2096 Lin LM317T 419 ULN2003A 16 1 49 746379 MM58174AN 16 Micro Compatible Time Clock 895 DAC1230 7b 12 8 Up D A Com 1 05 Lin LM317K 349 LM389N 18 19 XR2206 16 395 T MMS369AA N B Prog Oscilator Oider 60H7 179 DACI23 20 12 Bit Up D A Conv 1096 Uni LM3IBCN 8 159 LMS91N 80 16 1 19 XR220 w 249 uus f MM5369EST 8 Prog Osciliator Divider 100Hz 195 AY 3 10150 48 25K Baud UART M319N 14
96. E SURFACE FoLD HERE 1 fp FLEXIBLE PLASTIC BACKING mp INTERLEAVED ELECTRODES ELECTRICAL CONTACTS Fig 3 Details of the Interlink pressure sensitive resistor small plastic tube as shown The resis tance of the completed device will range from several tens of kilohms with no pres sure applied to a few hundred ohms with pressure applied The Fig 2 assembly is one of many ways to assemble a do it yourself PSR So long as the sandwich configuration of contact foam contact is preserved resis tors can be made in many different sizes and shapes For instance the contacts and the conductive foam can be formed into a square or rectangular shape And miniature PSRs can be made by cutting the component materials with a inch mechanical paper punch and installing them in a small plastic tube like those in which points for lettering pens are sold The above are but two of many ways to assemble do it yourself PSRs A third simple PSR can be made by mounting a spring on the control handle of a slide re sistor Though sensitivity might not be as goodas that of other methods results will be repeatable Back in 1958 one of the first radio transmitters launched in a model rocket used just such a device for an accelerometer I remember watching that launch from a field near Colorado Springs along with acrowd of high school model rocket enthusiasts and our dads Commercial PSRs Many different kinds of commercial pres
97. E DC VOLTAGE METER THEN PUSH THE TEST BUTTON If the meter comes up to or falls back to factory specified DC collec tor voltage the LV regulator circuit is working If it fails to do so it is not wcrking RED 8 RUN LIGHT means that the B source that normally keeps the horiz ose driver circuits running after the start up B pulse has been consumed has become open GREEN B RUN LIGHT means that the B resupply voltage scan derived is being provided All is normal if all three lights are now green The scan circuit short detector in the Mark V is identical in all ways to that which is used in the Mark III Operation is also identical Both units are virtuallv indestructable when simple directions are followed Both units carry a full year s warranty against defects in materials and workmanship parts and labor Either unit can be easily repaired by almost any technician in his own shop If the green circuits clear light is now lit It is now safe tc push the run button and examine the symptoms that appear on the CRT screen for the purpose of isolating any open cir CuitS Except for hock up and CRT filament warm up time this test can easily be completed in two to five seconds The Mark V sells for only 995 Visa and Mastercharge Welcome Diehl Engineering 6661 Canyon Drive F Amarillo TX 79110 Phone 806 359 0329 or B06 359 1824 CIRCLE 49 ON FREE INFORMATION CARD Yaesu has serious
98. E NO 126 ON FREE INFORMATION CARD CONSOLIDATED SSeS ee Eu E C TORO NL GiS Gaume aeara j We at Consolidated Electronics have filled this 128 page catalog with the best manufacturers and the highest quality products at the best possible price and shipped to you in 24 hrs or less CONSOLIDATED Sa wm Cat Nn ON E 705 Waterviiet Ave Dayton Ohio 45420 2599 1 800 543 3568 National amp Canadian WATS in Dayton call 513 252 5662 Telex No 288 229 CIRCLE NO 127 ON EREE INFORMATION CARD November 1985 MODERN ELECTRONICS 53 Computers Update lt Absolute Reset for Newest Apple IIs Information you need to use the Apple IIe Absolute Keset with the new enhanced Apple Ie and Hc he original Absolute Reset ar ticle that appeared in the Feb ruary and March 1985 issues of Modern Electronics gave fixes to change the Apple Ile s restrictive ROM monitor to an absolute old re set thereby unleashing the comput er s real power It was intended to work on only the version of Apple Ile computer made before January of this year You have the older version if you cannot enter BASIC com mands in lower case without getting a syntax error To have the Absolute Reset code work onanewly enhanced Ile or a IIc you need alike but dif ferent somehow patches as de tailed here customized for each ma chine version Shown in the two boxes is the key information you need
99. E TOGGLE SWITCHES primaries CONNECTOR 6 400 mfd 60 VDC GOId colbatt ALL ARE RATED 5 AMPS 125 VAC d M contacts rated 5 6 volts 750 ma 3 00 Mecha led 2 50 1 amp 9 30 vac Highly sensitive S PD T S PD T S PD T Gvolts 50ma 125 9 700 mtd 50 VDC TTL direct drive possibie 120 ohm on on on on on off on 18 voits 650 ma 3 50 31 000 mfd 15 VDC Operate trom 4 3 6 vdc non threaded terminals terminals 18 volts 1 amp 4 50 134 DIA x 4 HIGH 2 50 COIL 1200nms bushing 1 00 each 1 00 each j 24 v c t 200 ma 2 50 Same as Switchcraft 12CL5M 72 000 mtd 15 VDC Whig 3 32 x fy 75 each 10 tor 9 00 J 10 tor 9 00 24 v c t 400 ma 3 00 5 conductor in tine plug and chassis 2 DIA x 448 HIGH 3 50 1 50 each 10 tor 13 50 10 for 7 00 100 tor 80 00 100 for 80 00 28 v c t 15 amps 20 00 mount jack Twist IOCk style 185 000 mtd 6 VDC f j i mid j 3X eiieque amps 35 00 2 50 SET 22 DIA x 4vz HIGH 1 50 S PD T S PD T D PD T 13 VDC RELAY on off on on on i on on CONTACTS S PN C PC style PC lugs Solder tug WALL TI SWITCHING POWER SUPPLY a RN 10 amp 120 vac non threaded threaded terminals TRANSFOR MERS K x Energize coii to bushing bushing pa 2 00 each Ml Compact well regulated switching power supply 7 open contact 75 each Er 1 00 each yT 10 for 19 00 Ut at i designed to power Texas Instruments computer T COIL 13 vde 650 ohms 10 tor 7 00 iq 10 tor 9 00 100 for 1
100. EDMONTON ALTA 438 3321 508 Centrai Ave Westfield N J 07090 201 654 6008 3900 45 AM FM Radio IC 2204 W Specs Honc IC Sockets 14 PIN 13 18 PIN 17 20 FIN 19 22 PIN 21 24 PIN 22 28 PIN 24 40 PIN 39 7 Segment Display 3 Common Cath 15 7 Segment Display 6 Common Ann 65 Trt State LED s 3 1 00 Jumbo Red LED s Diffused Lens Prime Tu All 100 Prime 15 1 100 6 1 000 57 50 LED Mounting Clips amp Rings 15 1 00 Texas Inst 994A Keyboard Inc Data For Pins Made WhenEachKeyDepressed 495 Dip Switch 12 Position 2 100 Dip Switch 8 Position 4 1 00 Keyboard Push Button Tops 30 1 00 Audio Cable 30 Feet 1 00 22AWG Wire 50 Feet 1 00 27AWG Wire 50 Feet 1 00 Mini Lubricator amp Lubricant 1 00 Molex Pins 7 Pin Strip 100 2 500 4 K 6 Clock Module Crystal Controlled Green Disptay 12VDC T ime Set Switches Data 4 95 Rotary Switch 5 Position 5A 125V 3 1 00 Giant Alpha Numeric Display 1 1 2 X 2 7X5 35 Total Red LED Matrix Specs 4 95 11 LED Bar Graph Display 2 3 4 Rect LED peer Red Grn Amb Specs 269 Seven Am mpi Tapped Transformer Can Be Wired For 9V 15V 18V RegShpg 895 Wall Plug Transformer 24V 525mA 150 6 3V 1 2A Transtormer 120 12V Center Tap Transformer 2 50 Mint Audio Transformers 10 1 00 1N4007 20 1 00 1N5059 200V 1 Amp 15 100 1N5060 400V 1 Amp 10 1 00 Zener Diodes 20V 1W 30 1 00 Zener Diodes 1 3V 1W Glass 2560 0KC Crystal 3 579545 Color Bu st Crystal HC 18 1 0 Mhz Cryst
101. ENT SPEAKER INSTRUMENTS ent circuit must be used with at least an oscillator and an ac voltmeter S this circuit is more in the ac cessory rather than instrument category To be useful at all it must be connected to a signal generator and a voltmeter or chart recorder or oscilloscope as detailed in Fig 2 In this circuit R makes the ac voltage from the oscillator appear as a constant current The only limiting factor in this arrangement is the oscil lator which can be narrow or broad spectrum depending on your specif ic applications Therefore the volt age dropped across the device under test D U T in Fig 2 is simply a di rect indication of its impedance When the bridge is calibrated each ohm of impedance is equal to 1 milli volt at the accessory s output This greatly simplifies matters since the measured voltage on the meter on a millivolt scale can be directly read as impedance For example a reading of 2 7 mV becomes 2 7 ohms while 32 mV becomes 32 ohms If your voltmeter lacks adequate sensitivity to accurately respond to signal amplitudes in the millivolt range you can simply run the oscilla tor s Output through an amplifier to obtain the required signal boost to obtain useable readings If you do this note in Fig 2 that the amplifier connects in series with the oscillator and bridge as indicated by the X through the feed line If you know the amplifier s gain
102. ICD 08559 NOVEMBER 1985 1 95 CANADA 2 50 TM THE MAGAZINE FOR ELECTRONICS amp COMPUTER ENTHUSIASTS NEWEST RADAR f DETE EU TORS C PRON E EARIRIGER SUBSTITUTE PLAY 09m cup gt e eanpame UPTO 200 TUNES Projects amp Applications Computer System Power Controller with Surge Spike Protection A H n Automobile Radar Detectors p 22 I i i First impressions Bridge for 9 GEM s Macintosh Like Graphics leasurements for MSDOS Computers t or Brighten Lights Kapro s 16 Bit Laptop Machine nd Automatically Heaith amp Fitness Software Mello Phone Super Musical Telephone Ringer p 36a We Kzyp o 2000 Laptop PerSon Smputer p 70 Bulk Rate Plus Testing Yamaha s Do It All Audio Video Receiver and an 8 Input Scope Permit No 79 Multiplexer Using A Word Processor to Make Isometric Drawings U S Postage Paid International SW Program Updates Latest Satellite TV Happenings Gordonsville VA 22342 Electronic Computer News and more ICOM 25 1300MHz Plus CYK OM commenicarions grcErv rg C RVFOOO SCAN START STOP SET RESET CL auTO feosw R co PRK PROG prSEL w MEMORY mo iz Lolli SET me m em ICOM s commercial quality scanning receiver Top quality at a gem of a price ICOM introduces the IC
103. Ile of course How else could you possibly do an isometric drawing Figure 2shows us some details Isomet ric drawing is one standard way of show ing three dimensional objects on a flat sheet of paper The original x axis leans up 30 degrees to the right The original y axis leans up 30 degrees to the left The original z axis still goes straight up and down You can measure actual scale lengths along all three axes I ve put together some Postscript rou tines that easily let you do Laserwriter graphics directly out of Applewriter The cl cr and ct commands handle the circles as ellipses slanted and stomped just the right way for left right and top faces al ar and at do the same thing for arcs Im Irm Id and Ird commands handle left moves and left draws both relative and absolute Similar commands exist for the other two axes while the im irm id and ird commands do a triple isometric move or draw all in one command These are needed for positioning or for slanting lines that go in two or three dimensions The dashes are done by using the SET DASH operator Compound curves are handled with the cubic splines we looked at last month Neatest of all are the pr pl and pt com mands that print right print left and print top automatically slanting and arranging the letters so they seem to belong on any face The actual isometric transformations aren t really all that bad They are vertical 2 z 4 0 5 x 4 y
104. L ABOVE ORDERS PLEASE INCLUDE 3 00 PH ON ALL KITS AND PRO DUCTS PLANS ARE POSTAGE PAID SEND CHECK MO VISA MC TO INFORMATION UNLIMITED P 0 BOX 716 DEPT ME4 AMHERST NH 03031 CIRCLE 49 ON FREE INFORMATION CARD e General Communication e Industry e Marine VHF e Scanners e Amateur Bands e CB Standard e CB Special e Microprocessor Call or Write JAN CRYSTALS P O Box 06017 Fort Myers FL 33906 6017 mcs 813 936 2397 CRYSTALS Since 1958 nas VISA mes C CIRCLE NO 139 ON FREE INFORMATION CARD November 1985 MODERN ELECTRONICS 85 ELECTRONICS Commodore Accessories x x x x x APPLE Accessories gt RS232 Adapter JAMECO s APPLE Compatible Products T ud for VIC 20 and amet 16K RAM Card ENT 5 Controller Card Commodore 64 Jz x Language Card ILE For or Apple t m A e For Appie II and II 5 ameco 80 Coiumn plus 64K mS RAM for Appie He The JE232CM allows connection of standard serial RS232 printers modems etc to your VIC 20 and C 64 A 4 pole switch allows the inversion of the 4 control lines Com plete installation and operation instructions included Plugs into User Port Provides Standard RS232 signal levels Uses 6 signals Transmit Receive Clear to Send Tre sesso Ham Card atrows the Apple il and Controlle Cara i Computers to expand tom 48k 1 t 75 19 Slandard He Request to Send D
105. Light Dissolver can be put Herearea representative few eYou can permanently wire a Light Dissolver for simple fade in out of lighting in any room Motorola Inc Small Signal and Sensor Products 44 MODERN ELECTRONICS November 1985 eA very practical application is to use a Light Dissolver to slowly fade out lights when you leave your home garage workshop etc You will never trip over unseen obstacles in the dark again For this application use a 2 to 5 minute fade out eAnother application is to have adjustable background lighting for viewing TV working at a computer video terminal or setting a mood Once the desired level is manually set flip the switch to on and the light will come up to the preset level e You can also use the Light Dis solver as a speed controller for a small dc motor The motor s speed will come up slowly instead of abruptly the way it does with HIGH MEDIUM LOW fan switches eBeing more imaginative you can use two Light Dissolvers with two slide p ojectors to give really pro fessional presentations Connect a Light Dissolver to each projector and set one Dissolver for fade out the other for fade in A 1 or 2 second period for the fade in and fade out EMEN eC R4 5 SQ 5K E MANUAL R8 2 4 R13 L1 1K 180 see text R12 E 100 R14 is 2 4K 2N4871 E E x Hs a 1p F Tar MPS6516 E a5 E MDA 920 4 MT a4 e Ff 2N6071 u7V a c R2 l
106. MM6B174AN 13 75 pact number MSM5832 938 H Pricing b 1000 NSCHON 2125 Siticon Transistors NSCBOON 1 12 48 B DIGI KEY 1 4 Wat xat RS SO 3 30 00 NSCBION 1500 pan m For large quantities snd prices xs low as 8 157M cai OMEN sol e Durkey 2N3055 3 4 Wett Metal Film Assortments 2N3904 zz i RSX1 Seach of values 102 to 9 69 125 96 AIDE O A 2 5 490 total pea aa EN ele ASX2 beach ot values 1002 to 9769 123 98 ADCOBOGLCN 7 490 totai pcs l ADCOBOALCN 00 B 2N4401 ADCOBOSLCN5 63 Bl 2N4403 R X3 Basch of values 5 00KQ to 9 76K Q 25 96 1480 total pcs ADCUBOBCCN 12 b B 214410 ADCOBOSCCN5 88 215087 RSX4 Seach of vaiues 10 OK 10 97 6KO 28 96 1480 total pes ADCUBISCCN 18 B5 2N5089 ADOOB17CCN11 I CON 11 2 2s210 RSX5 Seachof values 100KQ tn OOMG 29 96 1480 tota oca cn nen ao CH Co 2 i Gb OM S BSSBS cesses gt 3 ao BH GOOSRS Foe waunok a Some ee t NINIIIN BszafadoddcaNS 58gSECSBSsdadsESS SRoxcUEKGSEEJSNRSCESPISGEBIQOSIdSSE SadSENGCER MP o n S 8 BESSSSREHSEBRAS os a3 Bi ma u c a JERSE N Basgasun azs5sEBSiroGgSZ9gSBBBGmzrA5s BESRBELaSF AEB ASLHASASORELAB s E SS8S SSSRSESS SEs SSESSASESSSESR SS EFESE E z BN x m a EH e E PSSEYRNSNNE P2091 F2067 P2068 P2069 P2070 2071 P2072 P2073 P2074 P2076 P2076 P2077 P2078 P2092 P2083 ASSORTMENT OF 3 POPULAR CAT NO 5495 VALUES PANASONIC CUALITY E KIT E uuu SREESBSSESEE
107. MODERN ELECTRONICS 73 MG CN CN E COMMUNICATIONS ll International SW Program Updates By Glenn Hauser While columns such as this and DX broadcasts can bring you the information you need to make good use of your short wave radio there s no substitute for be longing to a DX club By means of a reg ular bulletin hundreds of far flung mem bers share information about their log gings station news equipment experi ences etc So from time to time we ll pro file different DX clubs Union of Asian DXers 32 4a Mal watte Road Dehiwala Sri Lanka is looking for new members in North Amer ica not just anyone but those with a serious interest in DXing Asia Third world DXers face a multitude of difficul ties in obtaining equipment and supplies and UADX deserves great credit for sur viving 13 years under the leader of Victor Goonetilleke well known for his reports on Radio Netherlands The mimeo graphed bulletin of about 8 pages comes out approximately bi monthly Samples are 3 International Reply Coupons IRCs those who join can later remit directly in dollars to a U S representative Canadian International DX Club 6815 12 Ave Edmonton Alta Canada T6K 3J6 is that country s only English speak ing club in which American members may participate fully Publishes a monthly offset printed magazine of 44 pages or more CIDX Messenger with a varie ty of columns covering loggings on M
108. Monitors in an Apple Ile By now it has become painfully obvious that the enhanced Ile monitor is pretty much useless when it comes to running older Apple software And more than a few unfortunate epsilon minuses got sucked into letting an Apple dealer steal their old monitor ROMs when they at tempted doing a so called upgrade Sadly the upgrade is needed for re leases of future software even if it utterly demolishes the value of most older soft ware that you already own Both the old and new monitor chips are compatible with industry standard 28 pin 2764 EPROM chips by Intel and Hitachi The usual dual monitor solution is to take a mechanically similar but elec trically double sized 27128 EPROM and put two monitors in it one in the top half and the other in the bottom A quick and dirty way to switch between the two is to lift pin 2 from the socket and jumper clip it to ground for the low monitor and to 5 volts for the high monitor Figure 1 show us a cleaner and safer way to handle dual monitors at a cost of only a few dollars You plug two adapter sockets into your Apple where the CD and EF monitor chips are supposed to go Then you plug 27128 EPROMs into the adapters A pair of switches is then flipped left for the high monitor and right for the low monitor One suitable source for EPROM pro gramming is E TECH Services who give prompt and low cost work Note that you have to sen
109. NEW 1986 CATALOG CIRCLE READER SERVICE NO FOR FREE COPY THIS MONTH Z SPECIALS DYNAMIC RAMS The micro soldering station are E that s temperature Top Mine 5 49 ALL adjustable NEW ak 5 99 CURRENT gt 2764 skxs300 64x 3 89 aA ta vv 27128 i6kx8 300ns 128k 5 99 B nas 27256 32xx8 250ns 256k 11 89 Spas s 2708 es e compact station is adjustable between 500 and 700 F e perfect production tool for micro circuits and fine WESTBOROUGH MASS STATIC RAMS 8K x 8 150ns 64K 6264 FULL LINE OF MICROPROCESSORS AVAILABLE WE ALSO STOCK Books Breadboard amp Accessories e Capacitors Chemicals Connectors e Crystals Plugs amp Jacks Fans e Enclosures 9 Filters Fuses Heat Shrink Tubing Heat Sinks Kits e Knobs Peripherals Probes Opto e PCB Products Potentiometers USA P O BOX 9100 1 800 343 0874 SELF SERVE STORES LOCATED NEAR YOU JUST CALL WESTBOROUGH MASS 731 7441 256 7538 15 Pin Header amp Mating Socket Vert MT PC 156 Centers 5 1 00 Crystal Clock Oscillator 50 Miniature Speaker 2 8 OHM R90 Coils For Radio Elec s Feb 84 TV Project Toko amp S T 1 T 2 L 1 12uH amp L 2 O71uH Complete Set a All MC1330 Prime Moto BFO 85 Transistor Disc Caps OO t uf 7A4123 Pnme Na 470uf 35V Radial 470u 16V Axial 2N3904 2N3906
110. O K Base station Scanner antenna 35 00 USAMM K Mag mount VHF UHF ant w 12 cable 39 95 USAK K 4 hole mount VHF UHF ant w 17 cable 35 95 USATLM K Trunk lip mount VHF UHF antenna 35 95 Add 3 00 shipping for all accessories ordered at the same time Add 12 00 shipping per shortwave receiver Add 7 00 shipping per scanner and 3 00 per antenna BUY WITH CONFIDENCE To get the fastest delivery from CE of any scanner send or phone your order directly to our Scanner Distribution Center Michigan residents please add 4 sales tax or supply your tax 0 number Written pur chase orders are accepted from approved government agencies and most well rated firms at a 1096 surcharge for net 10 billing All sales are subject to availability acceptance and verification All sales on accessories are final Prices terms and specifications are subject to change without notice All prices are in U S dollars Out of stockitems will be placed on backorderaulomatically unless CE is instructed differently A 5 00 additional handling fee will be charged for all orders with a merchandise total under 50 00 Shipments are F O B Ann Arbor Michigan No COD s Most products that we sell have a manufacturers warranty Free copies of warranties on these products are available prior to purchase by writing to CE Non certified checks require bank clearance Mail orders to Communications Electron ics Box 1045 Ann Arbor Michiga
111. OC 6305 295 7448 3 379 74C16 M 129 74C9312 28 895 745140 WM 68 745280 M 189 8255 40 Prog Peripheral 1 0 PPI 335 745571 16 512x4 PROM TS 6306 295 74073 4M 69 740165 15 129 74C915 18 119 745151 15 98 749287 18 179 8255 5 40 Prog Penpheral VO PP SMHz 425 745572 18 1024x4 PROM OC 63 495 nc M 5 TACITA 06 89 74917 28 895 745153 6 9 7465288 t6 179 8257 5 40 Prog DMA Controller 6 95 745573 18 1024x4 PROM TS Siar 495 74085 16 139 TAClT4 18 1 19 740922 1B 448 745157 16 99 74 299 mm 595 8259 8 Prog Interrup Control 595 82523 i6 32x8 PROM Q C 27818 2 95 74C86 T 29 746175 16 119 740923 20 49 745158 16 99 748373 20 2 49 5259 5 28 Prog interrupt Controller 6 95 825115 4 512x8 PROM TS 27815 995 74089 16 595 746192 16 139 74C925 16 5 95 749180 15 229 745376 0 248 82 2 49 Sgie Dbie Density Floppy Disk Con 1695 828123 t6 32x8 PROM IS 27519 295 74co0 M 0 74193 16 139 740926 0 595 745169 5 429 745387 18 195 8274 48 Multi Protocol Serial Cont 7201 1495 825128 16 25644 PROM O C 7s 5 ie ite J4 95 w 029 E N ZA 7 174 Ww 109 7aSa7 m 495 M sz 40 Prog CRT Controller 1495 825129 16 296k4 PROM TS 27521 22 f n5 nu 0m 429 16 175 8o97 8 69 745175 1 amp 10 748477 09 495 8279 40 Prog Keyboard Dispiay Interface 549 825130 6 512x4 PROM OC Ap 3 95 ux 745188 18 175 749473
112. ON FILM RESISTORS DISC CAPACITORS TANTALUM CAPACITORS Price Cop Pres 9 P SOLDER TAIL ho Cap Vor 10 109 1 000 BIS Ker wi 3 DIP SOCKETS j m 10 pf 6 43 ag 71 P2000 IM P2001 Single beam rrme rT d 6 49 3871 p YOUR CHOIZE TIN OR GOLD s Ds maz 22 pi P2003 Low profile 5 49 48 71 Wium 56 mcroinch geld iiy on goif vocho Sm er Meee 7 pt 6 49 48 71 8 49 48 71 33 p TIN PLATED SOLDER TAIL Min 20 Microunctae riy fp MEX Working Voltage TOO Ml ME 5d 39 p 649 487 8 49 48 71 awe wc Rated Ambierr Temp rPe 47 pi 6 49 ag 71 Pert Bo CUesr keben 1 c E Operating Temp Ranye SC to 150C 56 p 6 49 48 71 CH908 Bpe oider tail tin 13 i t 68 pt 123 54 22 CB914 14 pw solder tant tin 15 Dimension 380 650 950 amp 2 p 23 54 22 C8916 JB pra solder tail tin 17 WE Dimension 150 230 320 100 c 5 43 4072 C8518 Bpin solder ted F 180 pl 43 4072 venait 045 050 060 p T3920 20pm solder tad 180 pt 5 43 40 72 MM2147N C8922 22n soldar wil 5 Carbon Clim Resis Values in Ob ms 1010 4 7M 220 pt 543 46 72 MiMZ716C Caso4 24 gin sodet tail How To Order Take any standard sesso value ia 270 pt 43 40 72 MM27150 5 CH928 ZB pin solder tail tin 3 2 and add an E for 1 8 wert ora Q lor 1 4 wati 330 pt 5 43 40 72 CB940 40 pir sokder tak tin oran H foc 1 2 watt iia 320 ford AQ 1 3 wot iis im 380 p 543 40 72 nii GOLD INLAY SOLDER TAN nN iri 470 pt 691 5 86 m o iT Pric
113. OS CUGEMEMMES 377 tune end marker MM During this discussion memory loca NAME Hz OCTAL BINARY More Tunes tions and data will be referenced In e JE 00 euti octal with hexadecimal notation in Fe 185 0 00001 G 196 02 00010 parentheses The music to be played ER m Es ri by the AY 3 1350 is stored in 2732A 4 220 04 00100 z as une EPROM memory in the form of 8 bit ps zm 5s E data bytes Each memory byte de c miaate C 262 07 001 E i CK 277 10 01000 scribes the pitch and the duration of x ad m Mg SS M wa the note being played De 311 12 DIOIO 376 end of listing The lower three bits specify note 330 13 01011 LS d h fi bi h F 349 14 01100 000 Not Used uration the upper five bits the ry 370 i iba 000 itch This permits 32 different G 392 16 01110 p p d am diff a Gs 415 17 01111 377 125 external ROM pitches and eight different ranon fa enoa 440 a 30000 enable key values to be specified One pitch code An 466 21 10001 E is allocated as silent toallowmusi i ES E i C 523 23 10011 nj F cal rests of differing lengths to be im C 554 24 10100 Fig 2 ipn iq iA plemented Table 1 gives duration D 587 25 10101 memory page data column in octal data while Table 2 gives the pitch E 659 27 10111 data for use in programming F 698 30 11000 i Fe 740 31 11001 When programming the EPROM jc 784 42 11010 a few rules must be observed In each d
114. Only after they receive your codeimage can they burn and ship the EPROM If you experience any difficulties in implementing either of the Abso lute Resets detailed in the boxes please contact me immediately You can get further information on any of the IIeand IIc not the II stuff by calling me at 602 428 4073 or writing me at Synergetics Box 809 Thatcher AZ 85552 ME Don Lancaster AMAZING NN SCIENTIFIC and ELECTRONIC DEVICES PLANS A I Parts Available In Stock e LC5 BURNING CUTTING C02 LASER 20 00 e RUB3 RUBY LASER RAY PISTOL 20 00 BTC5 1 5 MILLION VOLT TESLA COIL 15 00 e PTG1 PLASMA TORNADO GENERATOR 8 00 e GRA1 GRAVITY GENERATOR 10 00 e MAGNETIC CANNON PROJECTOR 10 00 KITS Includes Plans and Parts e LHC2K SIMULATED REO GRN YEL LIGHT LASER 34 50 BTC3K 250 000 VOLT TESLA COIL 159 50 OG1K ION RAY GUN 109 50 e PSP3K PHASOR SHOCK WAVE PISTOL 49 50 e STG1K STUN PARALYZING GUN 39 50 e INF1KINFINITY TRANSMITTER 134 50 e MFT1K 2 3 MILE RANGE FM VOICE XMTR PC BOARD 49 50 ASSEMBLED AND TESTED PRDDUCTS LGU30 RED 1MW PORTABLE He Ne LASER 315 00 e TCL30 SOLID STATE TESLA COIL 35KV 74 50 PG50 POCKET PAIN FIELD GENERATOR 64 50 BLS10 BLASTER DEFENSE WEAPON 89 50 e iTM10 100KV SHOCK AND STUN GUN 99 50 e PPF10 PHASOR PAIN FIELD PORTABLE 249 50 e SNP20 SECURITY PHONELISTENER 99 50 CATALOG CONTAINING DESCRIPTIONS OF ABOVE PLUS HUNDREDS MORE AVAILABLE FOR 1 00 OR IN CLUDED FREE WITH AL
115. R 7000 advanced technol ogy 25 2000MHz continu ous coverage communications receiver With 99 owner pro grammable memories the IC R7000 covers iow band aircraft marine business FM broadcast amateur radio emergency services govern ment and television bands Keyboard Entry For simplified operation and quick CIRCLE 178 ON READER SERVICE CARD tuning the IC R7000 features direct keyboard entry frequencies can be selecte pushing the digit keys in s quence of the frequency or by turning the main tuning knoo 99 Memories The IC R7000 has 99 memories available to store your favorite frequencies including the operating mode Memory channels may be called up by simply pressing the Memory Switch then rotating the memory channel knob or by direct keyboard entry Scanning A sophisticated scanning system provides instant access to most used frequencies By depressing the Auto M switch the ICOM America Inc 2380 116 Ave NE Bellevue WA 98004 3331 Towerwood Drive Suite 307 Dallas All stated specifications are approximate and subject to change without notice or obligation All ICOM radios significantly exceed FCC regulations limiting spurious emissions C R700 ear IC R 7000 automatically mert i quencies in use while is in the scan mode This allows you to recall frequencies that were in u32 Other Outstanding Features e FM wide FM narrow AM upper and lower SSB modes e Six tuning speeds 0
116. REREdRARUESEJSESZEvNZQ4ggUXZIZgEZERBZLEEBISXEREEE Ba65e 5SZS 22 8SESEEBR Porn we eo wjn n ERGREASRSBIBRBES SERRE ZISE 2lAlals i i BN SE SSSESSSES SSS Gy Ree B agg 389 a LL wwe S RELLA BRoos acabe BRRR RIBER KRRBNB IBANE t M ann c BERBEA VSRRA GAaRE ESESB RSSLENKKBRE c SEESSEHHsc 5 UJ Lad da Cad GJ Cad Cad GJ GJ GJ QU fal amp BREIZCI ZowooS8SERUDdNZz oo WVOMMAMALNNH e mt t a ineasa33 saasaa SRRSKEEKRRS WO OU es UJ GF SONO AA SIERS 3 ps BRBSAESSEX o RASSE SN e amp 8 e 74170N 74173N 74174N 74175N 34176N 74177N 7A1BON Nn ca A I 331 1 Le ewN SDOOOO DO wuluning amp E 2 8 ke r3 i N RERBRNIISBEG Regra sagar SARs Seas ip s ocoo Balls gut BobRBleeBce Bese Metallized Polyester Capacitors o fab GS CFF A AD me me EORR TI LII Y 9 ods o we E a Ss QiGi KEY Working Pak OF Pek D Pek OF Pad UI fert Wa Veltege p 16 100 1900 E2103 01 19 13 68 323 GB E2123 012 15 1368 123 08 E2153 015 1368 12308 018 1368 2308 022 123 08 027 123 08 e LoococxommM a Move o D Peet hae ee RESSRARRSLS SRL tesRslioSeswiagauwl extceleeves ADCOEXICCN 525 57 ADCYODICCN2 50 E aoro A amean nv Pug ADGNIICCN 18 63 opera ADO3ED CCNT 75 i E rd D M 3 d DAC N i TE MJE3A39 i DACOND7LENT QU MJET 323 we 13 1 WI 5465508 0W ACD CRSM 172170 56 052 DACORIOL CHS 90 B MJES7U
117. SSSBS RAVES ABSSR NNSA RENRSiSSssz eiBekRw I CRSTSR ECS HBB AwESeeS Jd Dio ore RO 3 lagaag i ha TSERSSER aN te ee ae OD NI ONNOGKN g 5 BES SSE RRBSA HEBHKE TALS367N 74L 368N JALS373N 74 5374N 7ALS386N 8 x g d led RE Pam NN Bun w UP gs lab PE NB CO od M NS MINIMI ael x TELETELE Sring 8g IEE SESEBBESEBS z BEES IngaBnlBBBISiGaBSSS RBEJE ASEH RBENNNzSERIEEBREIDDSEEIREBREE uzizocbBgd 38882 E NN INR BRRARR E X LEPEEZCEEPBIISTIETT T1 COPA49SN OPB212N DP8216N OP8224N OP8226N N omn Ed amp gu F et IM wc y Lic lt a p uw EN RRR 74121N 4123N 7A125N 74Y32N 74141N Lad GEESE ESY RU RERESSBEY 2g NRSRBB i E GOLO INLAY WIRE WRAP mu m Micrinches Gois Pari No Description 10 102 Rated Ambient Temp B pm ware wrap yoki 5 80 57 00 a 14 pin ware wiap gokt 3 80 725 Oparty Temp Range 66 C to IBPC 16 pen wie wrap gokd B 40 83 00 66 18 75 18 pin wore wrap goid 9 80 57 00 on D 23 INSS073N 100 00 20 pan ware wrap gold 11 80 117 00 s 06 INSBIS4N 17 5C 22 pin ware wrap gold 3280 12700 INSRZGBN 3 38 24 pin wwe wrap gold 1280 13700 1 Mets Fim Vaiues In Ohma 10 0 ro 1 OOM ISP OF 362 25 00 f 28 pin ware wrap gold 16 80 16700 How To Order Take any standard wesmior value i MMBBIG AN 15 50 40 pin vanta wrap gold 72280 22700 G3 and edd an X w 1 69KX this in the Deg Key
118. TANDY 200 NEW NEW NEW Easy to install module plugs nghi into the socket increasing memory in 24K increments Complete with module amp documentation for Instanation i 2670 MMO EPR M200R Tandy 200 Expansion or 2 Hie JM GBA 27 5T Single Voltage intel National elc 1995 JM m TMS2564 TI 39 95 JM GISA 2716 inta TMS2516 T NEC etc 1935 JM 664C MCMBb8784 MCM6B768 Motorola 51995 JM G32A 21324 intel HEC n elc 1995 JM G128A 27128 Intal Tl NEC etc 31995 PROMETHEUS MODEMS i DE X d Sty JM G32C MCM2532 Motorola Ti National ete 1995 JM G512A 27512 intel AMD eit 1995 E JM GBAA 2764 intei NEC Th ex 1995 JM GS13A 27513 intei i 1995 Intelligent 300 1200 kerma a ee RO Sa i JMGEI3A 5213 52813 SEEQ 1883 JMGEJZA MCM2832 Molor 51995 Baud Modem with Real JMGEIGA 2516A Exel Inlel Rockwell XICO eic 1995 JMGESAA X2864A K28G4B X28054 Xicor 1955 JM GE168 281 B intet 1895 M GE256A X28255 X28258 Xicor 1395 SS Time Clock Calendar The ProModem is a Bell 212A 300 1200 intetligent stand alone modem gt Hayes command set compatible pius an additional extended command set Shown with alphanumeric display option PM1200 RS 232 Stand Alone Unit 299 95 JE664 EPROM PROGRAMMER 8x ro 64K EPROMS JE amp 64 EPROM Programmer is completely Ser contained requires no additional systems tor operation J Emulstes PROMs or EPROMS Pr
119. V FM and VHF UHF antennas And the great news is it requires only a lightweight 3 core cable very economical 3691 Cat D 5003 ROTATOR With a vertical load of upto 250kg and a wind toad of 0 4 square meters our new high load rotator is ideal for VHF beams many HF beams and virtually all TV antennas And best of all unlike previous rotators it requires just three con ductors between the control unit and rotator save on long cable runs Supplied complete with mast clamps and control unit ready to mount on a flat tower plate Cat O Cat D 5005 Top value Standard Panel Meters A high quailty range of moving coil meters with full scale accuracy better than 2 Pre callbrated in 5 popular varieties easily adapted to suit virtually any requirement with shunts and multipliers Dimensions Mounting Scale area 23 x42 Hole Required 1 75 Overall 23 x 2 Bolt holes 4 5 square 0 50uA O 5A O 20A 3500 ohms O 0O83ohms 0 007 ohms ONLY shunt shunt CatQ2020 Cat Q 2030 Cat Q 2035 9 O 1mA 0 20V DC 20 4 3VU 200 ohms 1k ohms V 1 228V 0dB ea CatQ2010 CatQ2040 Cat Q 2050 40 up 6 95 ea rge Panel Meters ln two ranges 100uA amp 1mA Larger style for larger projects Sizeis 4 x 325 scale size 4 x2 0 1 mA 0 100uA 200 ohms 3500 ohms Cat Q 2060 Cat Q 2070 4425 10 up 10 95 ea UN IS
120. Venezuela and Costa Rica Radio Earth Aug sseippy eweNn ewen Ausdwog dz A eis Z 2 amp na i Y eo o c o eo 3 a 2 8 2 2 1 2 3 amp n 14 15 o 9 25 28 27 9 37 38 39 9 49 50 51 o 61 2 63 2 73 74 75 85 86 87 97 96 99 109 110 111 121 122 123 133 134 136 145 148 147 157 158 150 109 170 171 N went on KCBI Sundays at 1800 2100 When KCBI s second antenna was fin ished for Latin America evening broad casts were expected perhaps on another frequency since AFRTS uses 11790 then and Radio Earth was considering switch ing to Saturday nights The shortwave station to be in Opeli ka Alabama NDXE has not reported any progress in actual construction but continues fund raising promotions the latest being an unbreakable ivory white plastic car or wall tag imprinted NDXE Worldwide USA with a rain bow decal superimposed The tags are two for 10 the decals alone 1 each from NDXE Box 569 Opelika AL Listening to AFRTS can be exasperat ing due to its fondness for two or three minute commercial network features in terrupted once or twice for commercials replaced by military PSAs giving the im pression that most servicemen abroad are foolish drug abusers But fortunately mostly on weekends AFRTS schedules some 25 or 30 minute network news in terviews or features including Sat 1135 amp 1435 Agronsky amp Company 1235 amp 1735 AP Portfolio 1335
121. W SWBC FM TV utilities hambands also bandscans QSL reports station news and schedules a forum very well done equipment reviews and the unique Arctic DX column with practical in formation on how to monitor life in the Arctic and Antarctic through radio transmissions Samples are 1 yearly membership is C 19 in Canada US 18 in the U S by check or money order Another club the American Radio Relay League has published this year a new edition of the ARRL Operating Manual this time not only restricted to ham radio but also containing an excel lent introduction to shortwave listening and DXing Check your local ham radio store for a copy or write directly to ARRL 225 Main St Newington CT 06111 for ordering information Now we spin the alphabet wheel to help you spin your dials or should I say push the scan button or the keys for direct fre quency entry not quite so romantic 1s it All times are in UTC unless other wise specified Argentina RAE Buenos Aires now has this schedule of one hour English broadcasts 1800 and 2100 on 15345 0100 on 11710 and 9690 and a final report at 1200 the next day on 15345 which usually comes in best On Saturdays and Sundays the 2100 broadcast is also on 9690 and 6060 Last summer our winter RAE took Sundays off Emilio Pedro Povrzen ic reports there are plans to start a special broadcast in English to the Falkland Is lands make that Malvinas
122. a SB GREBE BERRE S SSILLE 13 GARONNA Pan 051488N OS1489AN DS1489N Ub Ou IDIg 2n 59 ABABLaBS Zoar P3 tal QJ LO RO me ma Lad ne l e ma eU BRARL GRRAR FAAAM EEEREN A ETT TAAA om ait aes E22 al DIT REE ETIA J w E2824 E2105 E2125 E2166 E2186 E2228 ASSORTMENT CAT NO 15 POPULAR B VALUES E KIT 54 PANASONIC V SERIES Stachod Motathzeu Film IC pisc oe 85 ROWNO AU e e me t s a a gt BSA 74HCAQ20N JAHCA040N 74HCAOASN al 7AHCAOBSON 74HCA0G0N 74HCA4075N 7AHCAQ 7BN 74HC4514N 74HC4538N RPA ee ONAN RRA PA a RES 858 e Sune B2RSBRSLOL YE SRY ANNAN REBRRESRBESESERSERRALELLRRELE ddB5ttangu SN gsSo6c5hbs5m8 WOSHPEPSUREEPEREREERUSENEERES RR RRARRARRRRR RRR n gesatel IRELRRSERRR 74LS01N LSN 74LSO3N 7ALSO4N 74 S06N 74LS08N 7ALSOSN 7TALS TON 74LS 1N 7JALS12N 741 33N 741 S14N 74LS15N 74LS20N JALS21N JALSZ2N 74LS26N JALSZIN Rules oo ao ve ca o d za WRN A o JBEBBRdETYAYERNBEE uw a 179 LMIZOMP 12 2 61 LMOQOMP 15 2 61 cu RR oa 68 OQ doe couou OQ Lt NOM CQ MNNN S39 NA om PRERASEBILEL BILSi SRBRGHE E r Fase Operating Temperature Range ACC to BS9C Capacity Range 0 O uF to 1 Ouf Temperature Coethcient Ac t25 Standard Capacity Toterance t5 Dissipetion Factor max 0 Insulation Resistance 28 C 1000MO UF Vottage Coethcieni DCH Negligible Aging Rate Neginjb
123. al 60 Mhz Crystal TOS Heat Sinks i Bern 10 1 00 TO 18 Heat Sinks iBern 10 1 00 Super Sub Mini Ceramic Caps All 100 0015uf 100V 152 30 10 0022uf tOOV 273 30 100 8 PIN 07 16 PIN 15 0027uf 100V 272 30 1 00 QO33uf 1 00V 3321 30 1 00 0039utf 100V 392 30 1 00 0056uf 100V 562 30 1 00 0082ut 100V 822 30 1 00 4 7uf 40V Lytic Radial 20 100 47ut 25V Lytic Radial 10 1 00 1000ut 185V Twist Lock 1 00 3200ut 50V Ideal For Power Supplies 1 00 5600uf 25V Comp Grade 3 5 8 X1 3 1 00 1uf 50V Monolithics 10 1 00 22uf SOV Monolit ics 20 1 00 CIRCLE 58 ON FREF INFORMATION CARD Piher PT manufacturing e grounded tip 3 wire grounded power cord e includes 1 2 0z iron tip sponge and stand e replacement tips available in a wide range of sizes styles and materials CIRCLE NO Chip Caps Set of 4 2 Each 2 7 amp 3 3pf 1 00 33uf 100V Dip Mylar 10 1 00 1 000 PC Resistor Asst 3O Values 1 2W 3 Pots 1 Man Linear Taper 5 1 00 Motion Detector Bds Inc IC 2 7 10 00 Mot Det IC Only ULN2232A 3 2 20 10 00 Project Box Lid For Detector 1 95 Miniature Speaker For Detector 25 Extensive Construction Article For Det 1 TV Knobs 15 1 00 Ammeter 0 15 AC Amperes 4 95 Volt OHM Meter MVMNT 01K OHM 0 300V 2 Ps 6V Miniature Gear Motor RF Chokes 1 8uh 8 2uh 12uh 22uh 10 1 o0 22 44 Pin Edge Card Connector 34 Pin Connector For Drives W Hood BNC T Connector UG 27 4 Mixed Connector Ass t 1
124. altering Word Star s default tabs or adding a de structive backspace Perhaps UnderGround s Mel Murch wrote the beeping musical fanfare that begins the program but I think it was his coauthor the pseudonymous War Starr Work with WordStar long enough and you develop a weird sense of humor ME Names and Addresses Digital Research Inc 60 Garden Court Box DRI Monterey CA 93942 800 443 4200 Kaypro Corp Hard Soft Press P O Box N Box 127 Del Mar CA 92014 Riverdale NY 10471 619 755 1134 212 543 9313 M QUY aS ws yor oal wee MIT ned gt cot eO is C PE none d d a ane CIRCLE 94 ON FREE INFORMATION CARD November 1985 MODERN ELECTRONICS 71 2 AJ Pap EE c E CE ee dug Wi SOFTWARE FOCUS iis Health and Fitness Programs By Charles M Salsberg The Original Boston Computer Diet Scarborough Systems Inc For Apple Commodore 64 IBM PC XT PC jr and compatibles Two 5 25 disks 1 drive needed 79 95 Asin inveterate dieter who successful ly shedded almost half his weight more than a year ago I approached this popu Jar software package with more than a lit tle interest I used an IBM version on a Zenith Data System Z 160 portable com puter for three weeks every day before writing this report The package comes with a 100 page manual that comple ments the software as an integral educa tion tool Disks and manual are packaged in a large plastic case that is converted in to an ease
125. amp 100 6500 1 000 Wat 15 70 900 400 72 BQ 2Wan 18 85 1050 4750 8750 fc urge quentes and onces sa low du 827 75 14 c Dey Kay 3 Wett Resistor Assortments RS 5escho velues 0 472 10 562 90 00 1295 total pcs Rt 00 RS201 Seach of values G20 to 7 SKO M 00 1255 total pcs BA 00 RS301 each of values 8 ZKO 10 2 OM 84 00 1286 total pcs 63 00 2 Wan Resistor Assortments a pes 5 sach ol values 0 470 to 560 60 00 295 tata pcs 60 00 5 asch of values amp 2Q to 7 5KQ 00 550 00 125b tora pcs 1 1 AMP SILICON RECTIFIERS m 1 100 am EY 1 100 mi 5 WIREWOUND RECTANGULAR m a 034 I UPO4361C70 Stant RAM 107 UPD4364C 20L Staric RAM Part Mirus Kumi b Wen Weer UPD276AC EPROM One fime No Descaption Pkg 4000 1 0008 Operanng Temp Range BEPC ta 250C Programmable 28 Dip 1N4001 SO PIV DO 41 60 00 5 500 UPO2764D 2 EPROM Ultra Violet 1N4002 100 PIV DO 41 8000 540008 Temp Coetficent 300 PPM C Erssabin 28 Dip 1N4003 200 PIV 60 41 6400 55300 Dimension 220 480 UPO27128C 3 EPROM One Time INAODA 400 PIV DO 41 68 00 588 00 Ptogiammalie 28 Dyp 1N4005 600 PIV DO 41 7400 82500 5 Wwewound Rectangular Resstors 5 Wan Values UPD27296D 2 EPROM Ultra eos 14006 B00 PIV OD 41 8000 66100 0302 to 2 OKO 10 Wart Values 1 02 to 3 OKO Erasable s 1N4007 1000 Pry Doa 10000 710 00 UPD27Cf4D 25 EPROM Ultra Ved tN4148 Uhra Fast 09 i 2958 21125 nor yo Siei Tee etis fies Tite ne M Ae Erasable 28 Dip Sateh 7 SWS toe 7 50 5 wen
126. amp 2 PROGRAMS 20 00 Post Office Drawer 7765 VAN NUYS CA 91409 7765 legem m mp EE ZI HIGH PERFORMANCE AUDIO KITS Enjoy Surround Sound at home P 250 DL 249 assem 179 kit Reduce tape noise 30dB P 522 NR 139 assem 79 kit Call or Write for a FREE full line catalog PHOENIX SYSTEMS Dept 801 M C amp VIBA P O Box 338 B 404 934 9626 Stone Mtn Ga 30086 add 1 for First Class A Great Gift Idea Send 94 MODERN ELECTRONICS November 1985 MISCELLANEOUS 10 360 WEEKLY UP Mailing Circulars No Quotes Sincerely Interested Rush stamped envelope National Division Box 20728 MC11 San Diego CA 92120 REPAIR TV FAST Shortcut course symp toms troubles 20 years experience One re pair worth three times cost of course Send 15 00 Starlight Enterprises POB 189 M E Isom KY 41824 ASIAN LADIES want EP for friendship marriage SUNSHINE INTER NATIONAL Dept TR Box 260 North Hol lywood CA 91603 Hi Fi speaker kits auto speaker systems and speaker components from the world s finest manufacturers For beginners and audiophiles Free literature A amp S SPEAKERS Box 7462M Denver CO 80207 303 399 8609 SUPER SURVIVAL CATALOG Seventy publications Electronics Computers Ener gy Weapons Security Medical Financial 1 Examples Electromagnetic Brain blaster Disk Service Manual Com puter Phreaking Voice Disguiser A
127. amplifiers through the latter s channel 1 and 2 inputs while the Model 8001 s TRIGGER OUTPUT connects to the scope s Sync input Four or eight or a single inputs can be displayed on the scope s CRT Operating the Multiplexer s INCRE MENT button causes a 3 bit up down counter to step through the input channels The Multiplexer treats any signal on channel 1 as a reference Hence all other displayed wave forms from analog and or digital sources must be time related to this input Also thelowest frequency will be that of the signal fed to channel 1 With trigger and vertical outputs established between Multiplexer and scope we had no difficulty getting down to work For the higher fre quencies however we had to becare ful of trigger levels and to maintain frequency relation with the trigger in put We also had to make sure the 5 volt input range was not sub stantially exceeded Because all eight traces fall within a 400 mV full scale range we had to set our oscilloscope Global Specialties Model 800 Scope Multipiexer Labora ory Analysis Bandwidth confirmed Trace rise and fall times Input impedances for 5 V operations 19 44 MHz 18 ns IM 30 pF Impedance drops to 10 kilohms 680 pF above t0 V p p Maximum voltage Operating voltage Multiplex frequency rate Maximum scope screen signal display Ac operating range before display change Power drain 100 6 mA at 120 V ac 100 V p p 5 V peak
128. and EEPROMs up te 512K from your Master TRS 64K 2PAL Expands Model IV w Black amp White IC Operation is simple foolproof and tas Monitors only from 64K to 128K 29 95 Program capacity of 10 EPROMs at one time Status n dicator tor each socket Fully sutomatic Blank testing Programming and Margin testing EPROMs Fully automatic verification against Master both atter Pro gramming and during Margin testing at two VCC s TRS 80 Model 100 NEC gt Olivetti Easy to install module plugs right Into the socket Increasing memory in BK increments Complete with module and documentation for installation M1008K TRS 80 Model 100 Expansion 39 95 ea Uses Intelligent algorithms to minimize programming times or 3 for 99 95 Ail device sockets are Zero Insertion Force Textool NEC8KR NEC PC 8201A amp Olivetti M10 39 95 ea Sockets or 3 for 99 95 OPERATION The JE670 Gang Programmer s tully operated with jus 4 pushbuttons Operation is simplihed by employing Jumper Modules G Series for the different type devices The JE670 is ideal for production programming and testing Of IC s Input 11SVAC GOHz 15W Size 155e L x 8 D x 3 z H Weight 88 Ibs JE670 GANG E EPROM PROGRAMMER Assembled and Tested Includes JM G16A Moduie 695 00 JE670 JUMPER MODULES G SERIES TERSONATIY MODULE Partial rtial Listing New JM s To Be Announced NEW NEW
129. and frequency when a call is received loss of power delay function status channel lock out and search mode selection 699 95 CIRCLE NO 150 ON FREE INFORMATION CARD Telecommunicatons Tester Simpson Electric s new 3 digit DMM is specifically designed for telecommunications servicing The Model 467 2T has direct reading dB ranges and is switchable for 600 and 900 ohm references to accommodate both new and old telecommunica tions systems It also has a built in Continued on page 62 November 1985 MODERN ELECTRONICS 11 b E PRODUCT EVALUATIONS I The Yamaha R 9 A Do It All Audio Video Receiver Most well know manufacturers of stereo components have begun to acknowledge the much talked about integration of audio and video Nearly all of them have come up with a new type of compon ent the audio video receiver This com ponent might be anything from an ordin ary stereo AM FM receiver that has an extra pair of high level inputs labeled Video or VCR toa multi function al unit that includes a TV tuner and video signal switching and section facilities Yamaha s elegantly designed R 9 re ceiver is closer to the latter description though it does not go so far as to incor porate a TV band tuner The Model R 9 is able to handle and switch signals from any one of two video program sources Both video and audio signals mono or stereo from such video components can be handled a
130. and provide full scale measuring capacities from 200 mV to 1000 volts dc in five ranges 200 mV to 750 volts ac in five ranges 60 to 20 dB in three ranges 200 ohms to 20 megohms in six ranges three low power 200 A to 2000 mA ac and dc current in five ranges per function Voltage and resistance ranges have high voltage transient protection and all ranges are over load protected including fusing on the current ranges Basic dc voltage accuracy is 0 1 and ac voltage fre quency response is to 100 kHz Other built in functions include audible visual continuity indication NEW PRODUCTS logic level detection up to 35 volts diode test and differential peak hold A single 9 volt transistor battery pro vides up to 100 hours of continuous operation The DMM measures 5 63 W x4 6 Dx2 H and weighs 1 5 lb 350 CIRCLE NO 151 ON FREE INFORMATION CARD Desoldering Tools Wahl Clipper Industrial Products has introduced a new series of vacuum type desoldering tools The line consists of two static free models and one antistatic model All feature durable construction high vacuum solder sucking action recoil protec tion self cleaning plungers and re placeable tips All are also balanced for one hand operation with com fortable thumb profiles 9 95 for each tool 2 50 for replaceable tip CIRCLE NO 152 ON FREE INFORMATION CARD 62 MODERN ELECTRONICS November 1985 Caution Exercise care when atta
131. angle simply con nect the output from the bridge to the channel 2 input of a two channel os cilloscope and the output from the oscillator to the channel 1 input You will then observe that the two traces on the scope s screen are offset not in vertical alignment with each other This offset is the phase angle nantly capacitive the trace for the output from the bridge will be lag ging the trace for the output from the oscillator This condition will be just the opposite for an inductor With all we have said about the im pedance bridge we have not begun to scratch the surfacein telling you how useful this instrument can be on your testbench However we hope that what has been written here wili induce you to at least give the im pedance bridge a try Once you do you are almost certain to find uses for whichever is the lowest without For a component that is predomi it we have not mentioned ME having to recalibrate the system Most oscillators nowadays have a constant output voltage that does not vary with frequency RCA Goes Ku Band from page 30 Figure 3 shows a typical set of im uc ee ns eS Sa pedance versus frequency curves for full range two way and three way speaker systems The left most peak on each curve is the systems free air resonances This peak usually has a value of 25 to 70 ohms Lowest im pedance is usually measured just to the right of the resonance peak and the s
132. anual SIP MOST Transistor Data Book and SIP MOST Transistor Applications Notes The last jewel includes circuits for power electronics solar power optoelectronics audio and television Next in the pileis the EXEL Data Book that covers both data sheets and ap notes on electrically programmable PROMs or EEPROMS followed closely by the Cy press Semiconductor CMOS Data Book that covers a very large assortment of static RAMS PROMS PAL S and gener al logic circuitry Ferranti provided a technical hand book on the Super E Line Transistors that includes a bunch of ap notes on such things as motor speed controls flashers microphone amplifiers infrared trans mitters and a fluorescent lamp inverter Finally at the very bottom of the stack was a technical data catalog from MWS AIM 1326 Freeport Road Pittsburgh PA 15238 412 782 1624 Allied Electronics 401 East Eighth Street Fort Worth TX 76102 817 336 5401 Corning MP BH 5 Corning Glass Works Corning NY 14830 607 974 4411 Cypress Semiconductor 3901 North First Street San Jose CA 95134 408 943 2600 E Tech Services Box 2061 Everett WA 98203 206 872 9004 EXEL Microelectronics 2150 Commerce Drive San Jose CA 95131 408 952 0500 Ferranti Electronics 87 Modular Avenue Commack NY 11725 516 543 0200 Gila Valley Apple Growers Box 809 Thatcher AZ 85552 602 428 4073 Hewlett Packard Co 640 Page Mill Road Palo Alto CA 94304 40
133. arting of your programs informative suggestions on nutrition running injuries and running gear and an Index that s very compre hensive letting you whiz through the pro gram out of sequence Using It This program is much more than a brief guidebook to read on screen That s only a prelude to its real utility Based on the program s evaluation of your present fitness it sets up a training program for you or you can design your own if you wish It a ali sort of personalized too For example it will decline to create a training schedule for you if you choose to train for running way beyond your ca pacity as judged by the computer pro gram on the basis of your determined fit ness In this sense it s quite realistic It maintains in its data bank your schedule compares your training with your goals keeps a record of your racing and using a calorie counter for the latter to analyze food intake and to determine how many calories were wasted away by exercise It will even include records for other physical activities such as swim ming or cycling Moreover it can predict your probable race times and best compe titive distance The data disk hoids about 15 months of exercise information according to the software publisher at which time you ll have to use another data disk To print graphs you ll need DOS 2 0 or later which has to be loaded and the graphics command entered If your system is col
134. at cover the general subject of joystick inter facing will prove useful One of the best is TRS 80 Models I III amp Color Computer Interfacing Projects by William Barden Jr Sams 1983 Chapter 23 Various kinds of joystick interfaces suitable for use with PSR resistors are also given in Forrest Mim s Computer Projects Os borne McGraw Hill 1985 You should also carefully review the documentation provided with the computer you plan to use Especially important are the technical reference manuals available for machines like the PCyr and the Color Computer ME A Great Gift Idea DON T LET THE ELECTRONICS REVOLUTION PASS YOU OR A FRIEND BY SUBSCRIBE TO MODERN ELECTRONICS Now you can reach out every month and learn about the latest innovations in consumer electronics and personal computers what s new how products and circuits work and what leading authorities think of them Stereo Video Home amp Car Electronics Test Instruments Circuitry amp Devices Servicing Personal Computers Communications Construction Projects In every issue authors lucidly explain how exciting new electronics ideas are applied issue forthright buying counsel present complete plans to build electronic devices to enhance products even unique ones that are not yet being sold in the marketplace Feature articles tutorials and construction projects are the hallmarks of MODERN ELECTRONICS the new mo
135. ata Terminal Ready Data Set Ready comombiowvicrosot Soteard Buns appieson Canubie othanding up io ves des Easy tans DOS Cem and Pascal Compicie with instructions Recommended drives ADO 514 or ADD 12 JE232CM 39 95 Kay al Complete with instructions Key abl Nen NOUS NON Oe JEB6O ianc tex uEM 0 3995 JEB75 ucc y 49 95 VOICE SYNTHESIZER Jjameco Five Key 128K RAM Card RAM Software Programs For Apple Il Il and ilet Pisk The JE868 is functionally compatible with the Apple i language card and can be utilized with all software ihat can be used with a slandard 16K card The JE86a FOR COMMODORE VIC 20 AND C 64 Plug In Talking in Minutes JE520CM 99 95 requires no modifications to your Apple computer Five key software programs are included Memory Management Systern utilities d agnostics demos and RAM disk emulators for DOS 3 3 CP M and Apple Pascal Also features DOS retocator Complete with instructions Kay a b TRS 80 Accessories JE868 Expand A RAM 119 95 X viso Appl Di stic Disk Controller Card MPI 5 DISK DRIVE Maj acH DMEUS ponen eee For Appio ik i and ile The JE877 serves as a diagnostic tool an aaran caiman anco tool and a dual disk drive controller The JE87 will verity and check the operating hardware of your syslem each time you tum On your Apple Il I or e Test your RAM ROM CPU and disk drives Diag
136. ategic location began to be used to pinpoint speeding vehi cles The F C C initially allocated what is known as the X Band ata frequency of 10 525 GHz to be used for police radar enforcement The long wavelength of this band made it perfect for monitoring highways and interstates After a time the F C C allocated a second frequency the K The slim K40 Remote radar detector comes with a guarantee against cost of radar speeding tickets for the first 18 months Cincinnati Microwave s popular Es cort which uses surface mounted de vice SMD construction Band at 21 150 GHz to augment the existing radar program This nar rower frequency was better suited for shorter range applications The evolution of police radar units over the years has been an interesting one Early police radar units were rather simplistic high power devices which were capable of pinpointing vehicle speed at about a half mile range These were physically mount ed to the patrol vehicle and used from a stationary position This was fol lowed by police radar used in moving as well as stationary vehicles and these moving patrol cars were cap November 1985 MODERN ELECTRONICS 23 Fox Marketing s XKMR model is designed for use with motorcycles featuring very small size weatherproofing and high shock resistance able of aiming radar to the front and the rear for maximum coverage Then the police radar ar
137. band CONUS continental U S is nearing orbital capacity that power and siting restrictions are less exacting at Ku frequencies and that there is little terrestrial microwave inter ference with which to contend and al most unlimited placement of receiving antennas on the ground Densely popu lated metropolitan sites are also in cluded as long as there is line of sight access to the particular satellite The K Series will have dual horizon tal vertical polarization a design life of 10 years and transponder switching from east to west to CONUS on ground command They will contain six backup transponders for the two polarities and will measure 63 5 feet overall At time of launch each will weight 4144 pounds which will drop to 2170 pounds in orbit right serves to illustrate general transmit and receive techniques of each system While there is video compression and expansion in the TDMC arrangement shown in the lower portion of Fig 2 NTSC simply passes the composite signal througha 5 5 MHz elliptic filter adds the usual video preemphasis reverses the pro cess during receive and feeds the re sults into a line comb notch filter monitor or receiver The TDMC sys tem must convert all its compressed information back to analog via an A D converter expand and matrix the color difference for RGB then ei ther supply an RGB monitor directly or go through an NTSC decode pro cess and then feed a standard NTSC
138. ber 1985 receiver controls and special effects not now available in ordinary analog receivers As digital systems are advanced removal of most if not all artifacts stray video and cross color color interference should be eliminated with whole frame store instead of to day s line of signal additive and sub tractive comb filter luma chroma separation Furthermore as tech niques are mastered both line and frame averaging will result in consid erably better definition and resolu 4 1 November 1985 MODERN ELECTRONICS 29 TDMC TIME COMPRESSOR TOMC TIME EXPANDER Loa NTSC ge ENCODER RGB MONITOR tion at reasonable bandwidths Even now up to 30 megasamples can be digitized experimentally accomo dating an analog beamwidth of 15 MHz So when all luminance has been removed from the chroma channel and vice versa you see clean Identified by RCA as the 4000 Series spacecraft each of the new K Series Ku band satellites can cover part of or the entire U S Additionally there will be one spot beam for Hawaii Orbital as signments are at 67 77 and 87 west longitude WL A fourth assignment is being held as a reserve ground spare Shuttle Mission 61 B flown by Atlan tis will loft K 2 into orbit on November 27 Then on December 20 Mission 61 C flown by Columbia will place K 1 into orbit
139. bk 1983 84 19 95 Contains Data Sheets on all of intet s Microprocessors amp peripherals 2 volumes 2575 pages 30022 National Logic Data Book Set 1984 24 95 Volumes amp I 3485 pages Contains information on National s TTL product line and CD4000 family This includes 7400 74L S AS LS and ALS Series devices and MM54HC T4HC 54HCT 74HCT High Speed Micro CMOS family MM54C 74C family and CMOS LS VLSI 10 Minimum Order U S Funds Only CA Residents Add 61 Sales Tax Spec Sheets 30 each Shipping Add 5 plus 1 50 Insurance Send 1 Postage for FREE 1986 Jameco Catalog Prices Subject to Change Send stamped self addressed envelope to receive a Monthiv Sales Flyer FREE MUF60 SPN3 15 2462 Howard industries 4 68 sq 60ctm 9 95 SU2C7 Reverse Flow EG amp G Rotron 3 125 sq 32cm 9 95 1355 SHOREWAY ROAD BELMONT CA 94002 nas PHONE ORDERS WELCOME 415 592 8097 Telex 176043 CIRCLE 47 ON FREE INFORMATION CARD 86 MODERN ELECTRONICS November 1985 James Mail Order Electronics Worldwide Since 1974 J PM1200B without Software 239 95 PM1200BS with MITE Software 274 95 lt gt ameco IBM Accessories IBM PC XT Compatible Keyboard i bhi CLLLL LILILiuitia th VEA ARRAAR AAD Bilt om IBM 51 51 Equivalent to Keytronics 151 1
140. ble to the man who 1s ready to move up Grantham College of Engineering 10570 Humbolt Street Los Alamitos California 90720 Booklet CLIP COUPON This free booklet explains the Grantham B S Degree Program offered by inde pendent study to those who work im electronics 1 ELECTRONICS and mail in envelope or to Do You REALLY Want to Make More Money Yes it does take work and a few sacrifices to climb up the electronics ladder to where the bigger money is But if thats where you want to be then that s what you must do work harder at learning and getting the right credentials even if it takes a few sacrifices A B S degree and the knowledge that rightly goes along with it can give you powerful ladder climbing equipment in your search for suc cess in electronics The accredited Grantham non traditional B S Degree Program is intended for mature fully employed workers who want to upgrade their elec tronics careers Put Professional Knowledge and a COLLEGE DEGREE in your Electronics Career through Independent Home Study Study materials carefully written by the Grantham College staff for independent study at home are supplied by the College Your technical questions related to these materials and the lesson tests are promptly answered by the Grantham home study teaching staff Recognition and Quality Assurance Grantham College of Engineering is accredited by the Ac
141. cal education Over 490 tems Discover fascinating kits tc build enjoy and fearn with as well as assembiec high tech procusts for hcme business end hcbby ha e f d iv c fi d ne med Em o Heath Corr pany f Cept 079 254 Benton Haor Michigan 49022 I MAIL COUPON TODAY and receive the latest issue ef the Heathkit Catalog tree of charge I i Name gt P Heathkit mmff cty Heath i L d A subsidiary of Zenith Electronics Cor gt eration For more information on products described please circle the appropri ate number on the Free Information Card bound into this issue or write to the manufacturer Laptop Computer The Heath Company is offering an assembled MS DOS compatible disk less laptop computer The Model ZP 150 computer is built around a low power 80C88 microprocessor 32K of RAM expandable to 416K 224K of ROM containing a raft of applications software and an 80 column by 16 line LCD screen Built in interfaces include a parallel printer port an RS 232 serial port audio cassette player port and a tele phone jack that is used with the in ternal 300 baud modem These inter faces the RESET switch and the ac adapter jack are located on the rear of the computer behind a drop down protective panel Programmed into the ZP 150 s on board ROM are six business oriented applications programs de veloped by Microsoft Known as
142. cash or money order BAY STATE ELEC TRONICS PO Box 263 Accord MA 02018 TUNEABLE notch filters brochure 1 00 D K Video Box 63 6025 Margate FL 33063 305 752 9202 CABLE and SUBSCRIPTION TV secret manual Build your own descramblers con verters HBO Showtime Movie Channel UHF Latest theory schematics instructions suppliers list Send 8 95 to CABLETRON ICS Box 30502ME Bethesda MD 20814 DEALERS wanted Channel 2 3 and 4 notch filters Money back guarantee Send 15 00 for sample and quantity price list Specify channel s Gary Kurtz P O Box 291394 Davie FL 33329 SATELLITE DESCRAMBLERS Lowest prices anywhere Dealer inquiries welcome Send 3 00 for catalog We ship C O D S STARVIEW INC PO Box 103 Rexford NY 12148 518 785 1288 THE LNA SPECIALISTS Brand name Lowest noise Lowest prices We will not be undersold Send for prices LNA 201 E Southern Suite 100 Dept Al Tempe AZ 85282 BUILD Your Own Satellite TV Receiving Sys tem And Save Instruction manuals schemat ics circuit boards parts kits Send stamped envelope for complete product listing XAN DI Box 25647 Dept 30G Tempe AZ 85282 CABLE TV CONVERTERS DESCRAMB LERS Jerrold Hamlin Zenith many others Factory Units Lowest Dealer Prices Complete illustrated catalog 2 00 Pacific Cable Co Inc 7325 4 Reseda Blvd Dept 506 Reseda CA 91335 818 716 5914 CABLE TV Secrets the outlaw publication
143. ced near your telephone ME QUALITY COMPONENTS NOT MAIL ORDER SECONDS IC KOOLERS from UNITRACK dissipat ARI ES ZE RO Over 2 watts of heat irom INSERTION IC s producin longer ite N ng er mance FORCE 4 Just push IC kader on SOCKET Nod heat is Collected from lop Stock No Pine No 22225 14 29 22226 16 SCREW MACHINED SOCKET oa 272 PINS loose packaged in bags of E Pnce 100 Stock No 11310 is solder tail He with goid collet un sheil Stock No 29 11311 is wire wrap with gold collet 2 gold shell bm Do TI WIRE WRAP SOCKETS Tin plated phosphor bronze LE TTERS from page 4 talkie but found out that he only gets half Of our present 2 meter band Gordon West WB6NOA Costa Mesa CA Gorden West is a well known communi cations columnist and writes a monthly column on survival communications for our sister publication Popular Commu nications His advice is on target too Ed A Reader s Input e Using Voltage Comparators May 1985 is the first electronic circuit I have ever completely understood And now that I know so much I say there s an error in the text The second sentence under the Time Delay Circuit heading on page 37 should begin When the compara tor s input not output as printed goes fromOvolttoV Pleasecomment Paul LaCroix Mt Clemens MI You re absolutely correct Sorry Ed Send 1 00 postage and handli
144. ching pressure sensitive resistors or any other components to the joystick inputs of a computer You may damage the comput er void its warranty and disqualify it for repair by the manufacturer Since digital computers use MOS integrated circuits that are susceptible to permanent damage caused by electrostatic discharge remove any charge on your body by touching a grounded object For best results follow the precautions recommended for han dling and working with CMOS ICs Final ly use caution to avoid exposing yourself to the possibility of electrical shock while working with a line powered computer Going Further Pressure sensitive resistors have num erous applications many of which have yet to be fully developed Experimenters can play an important role in developing new applications for these devices since they can be easily assembled from com mon materials or purchased at low cost For more information about pressure sensitive resistors see the FSR applica tion note published by Interlink Electron ics Also see Making Your Own Pres sure Sensitive Resistors Computers amp Electronics Nov 1982 p 124 Thomas Henry of Transonic Laboratories wrote a brief application article on the subject titled Conductive Foam Forms Reliable Pressure Sensor Electronics May 19 1982 p 161 If you wish to find out more about con necting PSRs to the joystick ports of per sonal computers several references th
145. circuitry involving sharing the synthesizer address bus for tune se lection is required There are also 28 tunes programmed into the synthe sizer that can be accessed Interested readers can contact me per the ad dress in the Parts List or refer to the General Instruments data sheets for information on these features As designed the Mello Phone dedicates one page of memory per tune This simplifies the tune selec tion circuitry and permits longer tunes containing up to 252 notes and rests to be played A 2716 EPROM can be substituted as long as S D is set to OFF at all times Thus eight tunes can be selected using switches SIA SIB and SIC Power for the circuit is derived from the ac line via a 9 volt adapter Table 1 Note Duration Table ADDRESS DATA 5 x MUSICAL 0 377 tune select timeslot feeding VR1 C1 and C2 The incom NAME NOTATION OCTAL BINARY ing 9 volts is regulated down to the semiauaver 0 000 5 volt dc level required by the re Quaver 001 mainder of the circuitry A standard Ootted Quaver 010 Tune 9 volt 150 to 200 mA adapter is suf Crochet ficient for powering the Mello Dotted Crochet 100 Phone Maximum power consump Minim i 101 im E E tion of about 1 watt occurs when the Dotted Minim 110 phone is ringing and speaker volume Semibreve m is turned up to maximum m C Programming the Synthesizer Table 2 Note Pitch Table OS
146. crediting Commission of the National Home Study Council as a degree granting institution All lessons and other study materials as well as com munications between the college and students are in the English language However we have students in many foreign countries about 80 of our students live in the United States of America Grantham College of Engineering 10570 Humbolt Street Los Alamitos CA 90720 Please mail me your free catalog which explains your B S Degree independent study program Nim ann O aI Address qm qt ee Se Se ee ee ee ee ee M ee September 1985 MODERN ELECTRONICS 1 n MODERN ELECTRONICS THE MAGAZINE FOR ELECTRONICS amp COMPUTER ENTHUSIASTS NOVEMBER 1985 22 28 34 36 42 d 50 53 54 10 86 70 EL amp 72 Mu 74 i 77 22 94 VOLUME 2 NUMBER 5 FEATURES Radar Detectors A guide to automobile radar detectors and methods By Ron Cogan RCA Goes Ku Band Three new satellites serve TV broadcasting business and TVRO viewers By Stan Prentiss The Siliconnection New book explores modern age of electronics By Art Salsberg Mello Phone Super Musical Telephone Ringer Project substitutes up to 200 musical tunes for standard telephone ringer By Steve Lympany A Computer System Power Controller with Surge Spike Protection Individually turn on off computer and pe
147. cs Designer s Catalog for more details One Company that I ve found has bar code components parts at fairly low prices is Scan A Matic For a complete list of all major bar code manufacturers and suppliers con tact the AJM Automatic Identification Manufacturers trade group Their free membership directory lists dozens of ma jor bar code outfits What s new in Fiber Optics Let s see Motorola has evaluation sam ples of its fiber optic links available This gives you a 10 MHz infrared emitter a fast PIN diode detector and a meter of fiber optic cable The fiber cable is removable and you can easily shorten it to any length with a plain old X Acto or other utility knife Advantages of a fiber optic link in clude total electrical isolation from input to output the ability to work in hazard ous locations elimination of noise cou pling and ground loops and lack of most EMI or RFI interference Hewlett Packard has a well written Fi ber Optics Handbook available from its German division The handbook has a good fundamental review of the physics and electronics behind fiber optic com munications Finally Guidelines is a quarterly Corn ing Glass in house publication that cen ters on their fiber optic activities I think all of this stuff is free provided you make the usual professional sound ing requests preferably on a business let terhead or by way of a direct phone call How can I put Two Different
148. cy 45 channel scanner vac mes emi 1 DO R1060 K Regency 10 channel scanner 98 95 MX3000 K Regency 30 Channel scanner 189 00 C403 K Regency 4 channel scanner 69 00 R106 K Regency 10 channel scanner be 99 00 RH250B K Regency 10 channel VHF transceiver 329 00 RU150B K Regency 10 channel UHF transceiver 449 00 RPH410 K 10 ch handheld no crystaltransciever 399 00 BC10 K Battery charger for Regency RPH410 79 00 MA256 K Drop in charger for HX1000 scanner 79 95 MA257 K Cigarette lighter cord for HX1000 19 95 MA917 K Ni Cad battery pack for HX1000 24 95 EC10 K Programming toolfor Regency RPH410 20 00 SMRH250 K Service man for Regency RH250 20 00 SMRU150 K Service man for Regency RU150 20 00 SMRPH410 K Service man for Regency RPH410 20 00 SMMX7000 K Svc man for MX7000 amp MX5000 20 00 SMMX3000 K Service man for Regency MX3000 20 00 B 4 K 1 2 V AAA Ni Cad batteries set of four 9 00 A 135C K Crystal certificate 3 00 FB E K Frequency Directory for Eastern U S A 12 00 FB W K Frequency Directory for Western U S A 12 00 TSG K Top Secret Registry of U S Govt Freq 15 00 TIC K Techniques for Intercepting Comm 15 00 RRF K Railroad frequency directory 10 00 CIE K Covert Intelligenct Elect Eavesdropping 15 00 A60 K Magnet mount mobile scanner antenna 35 00 A7T
149. d scanner accessories from J I L Regency and also Uniden Bearcat Chances are the police fire and weather emergencies you ll read about in tomorrow s paper are coming through on a scanner today NEW Regency MX7000 K List price 699 95 CE price 429 00 SPECIAL 10 Band 20 Channel Crystailiess AC DC Frequency range 25 550 MHz continuous coverage and 800 MHz to 1 2 GHz continuous coverage In addition to normal scanner listening the MX7000 offers CB VHF and UHF TV audio FM Broadcast all aircraft bands civil and military 800 MHz communications cellular telephone and when connected to a printer or CRT satellite weather pictures NEW Regency MX5000 K List price 599 95 CE price 329 00 SPECIAL Mult Band 20 Channel No crystal scanner Search Lockout Priority AC DC Selectable AM FM modes LCD display World s first continuous coverage scanner Frequency range 25 550 MHz continuous coverage Never before have so many features come in such a small package The Regency MX5000 mobile or home scanner has continuous cover age from 25 to 550 MHz That means you can hear CB Television audio FM broadcast sta tions all aircraft bands including military and the normal scanner bands all on your choice of 20 programmable channels NEW Regency MX4000 K List price 629 95 CE price 299 00 SPECIAL Multi Band 20 Channel No crystal scanner Search Lockout Priority AC DC Selectable AM FM modes
150. d the Gulf of Mexico Suddenly the sharp beams of headlights pierce the darkness from behind and the late evening calm ex plodes in an array of brilliant red lights reflected in your rear view mir ror Your presence is being requested at the shoulder of the road by the lo cal constabulary 22 MODERN ELECTRONICS November 1985 What did you do you wonder Af ter amoment of discussion youlearn that you passed through a town that cut into the main road for about 4 mile and that a new speed limit of 25 mph was supposedly marked for this short stretch somewhere It was all past discussion because you were caught in the innocent act of one of the greatest revenue gener ating devices ever devised for city and state governments police radar Many small towns purposefully set up this way to enhance their operat ing budget Unknowing drivers suf fer forit unlessthey have a radar detector to defind against entrap ment What Is Police Radar The word radar is a simple acro nym for RAdio Detecting And Ranging We re all aware that this The Spectrum Whistler remote detec tor with a weatherproof front end that s mounted behind a car s grille system is used to aid and track the navigation of aircraft everywhere Some years ago an innovative soul came up with an interesting applica tion of radar to combat speeding mo torists on the highway A single radar unit in a str
151. d them disk based images of the code you want burned into both 27128 EPROMS The key to the adapters is to use pre mium machined contact sockets that may be safely plugged into each other These sockets are held apart by machined con tact DIP strips that give enough separa tion to make room for the switch Be sure to use a slide switch and not a toggle switch and be sure the spdt slide switch is a break before make type There are some obvious modifications or improvements you might like to try You could replace one switch with a wire that reaches over to the center of the other switch on the other adapter This way only a single switch flip will be needed to pick one monitor or the other Switch flipping is best done cold If you try to flip the switches during a program strange things may happen depending on whether either monitor is being accessed 64 MODERN ELECTRONICS November 1985 1 Place the 28 pin machined contact DIP Socket pins up and identify pin 26 Caretully bend pin 26 towards the center as shown Pins are nurnbered backwards from usual when they are viewed from the bottom 2 Push a Single bare machined contact socket pin onto pins 14 27 and 28 as shown NOTE In any soldering steps snap an extra DIP strip onto the cool end of the pins being soldered This keeps the pins aligned should the plastic soften Solder pin to socket at pins 14 27 and
152. dar detector could be arrested hauled off to jail and have his detec tor confiscated However under Title 47 of the Communications Act of 1934 the Federal Communications Commis sion specifically states that no radio receiver can be licensed restricted or banned Since a radar detector is in deed a radio receiver this caused the legality of the blanket banning of radar detectors to come into ques tion After the dust cleared on this legal matter only two states Vir ginia and Connecticut have chosen to maintain that radar detectors are illegal through rather creative inter pretations of the law The second part of the two pronged attack involved police agen cies receiving approval for the new K Band frequency They began em ploying these units in conjunction with and sometimes in lieu of the first generation X Band radar de vices As the radar war heated up and a new generation of radar detectors were unleashed to detect the presence of both X and K band police radar the offense took further technologi cal steps to make detection more dif ficult than ever before Entering the picture at this critical point was the low power speed radar device to pre clude long range detection and the pulse radar which would send inter mittant signals in an attempt to thwart easy detection by the present genre of radar detectors on the market The counter to this was production of more sensitive detection syste
153. ded to the database In each session you meet with your computer counselor You can choose from among three counselors each of whom exhibits different personalities as screen responses will illustrate Selected keys on the keyboard make controlling the system easier Menus are complete with only one press of a key needed for most commands The func tion keys help with food reporting Keeping track of all food caloric in take is one of the best ways to shed pounds since most of us are not aware of how much food we actually consume This program can give printouts of upto a year s intake User Comments The master disk contains the installment part of the program It introduces you to the program and then asks a long list of questions concerning medical nutrition al and behavioral types of information Your answers are recorded and taken into account when the counselor makes suggestions The computer will keep you informed about how much you should be eating a day The first week you set your weight loss goals and caloric targets Planning meals ahead of time is a concept that s intro duced as a weight loss technique This way when you ve reported what you ac tually ate the computer compares it to what you planned Developing an exer cise plan is next All of these steps need only be done once unless you decide to modify goals The whole initial installation including directions on how to use the
154. dentities Dead 11059 12 95 Systems Basic kit comes with 24 various Dual Sockets 40 various Plu Strips wire and tools Kit can be used with any of the six boards Components Replaces Volt Meters identify dead components which do not emit heat Just point thermistor probe within 1 16 ot board move Dip socket Sized piastic panels with numbered holesin pin toca tions Slip onte Socket betore wire wrapping to identity pins Also write on them for location IC part number function etc over components and see ac ae Simolifies initial wire wrapping which are Stock No Price M troubleshooting and repa 4 95 per pack dead 22300 rema TeS we CIRCLE 95 ON FREE INFORMATION CARD dock No Description 3500 Basic Kit Basic board 4 5 x 5 5 Intel SBC 8010 Board 12x 675 Motorola M 6800 Board 975 x 6 S 100 Board 10 x 5 3 Z 80 Board 7 7 x 7 5 Eurocard Board 63x 3 9 ETT ICINSERTION EXTRACTION KIT Includes DIP iC extractors and trom 14 to 40 pins Tools that engage conductive surfaces are V a n CMOS sate and include ground kN m9 05 Tiao S 41 34 inserters toaccommodate all ICs s SIN i EC CO We accept VISA MC TOLL 800 526 5960 INCLUDE SHIPPING CHARGES FREE in nu 201 996 4093 100 to dep aver 250 5 28 8th St Box 410 Frenchtown NJ 08825 4 00 5 00 November 1985 MODERN ELECTRONICS 91 PICTURE Flyer lists quality electronic sur plus at low
155. der T amp M Electronics Dept M 472 East Main St Patchogue NY 11772 516 289 2520 LOW priced components unusual surplus items Free flyer ELECTRONIX LTD 3214 South Norton Sioux Falls SD 57105 TEST EQUIPMENT signal generator volt meters oscilloscope Other types equipment J B Electronics 9518 Grand Franklin Park IL 60131 312 415 1750 PRESSURE SENSORS Xducer alone 11 00 With 0 10v electronics 19 95 Sensi tivities range from 0 1 1 0 H2O F S to more than 0 100psi F S Send SASE to SYNO DULE ELECTRONICS 38 Montvale Ave Stoneham MA 02180 PATENTED electronic plant soil moisture in dicator world s only working producible unit Water Witch exclusive pre high volume production kit and gift rights Unit includes pcb amp parts 19 95 add 2 50 postage JOBO PO Box 61375 Sunnyvale CA 94088 92 MODERN ELECTRONICS November 1985 including new Jerrold Tri Mode or Bi State SB 3 Hamlin M 35 B Oak VN 12 Zenith and more New volt guard surge protector Dealers wanted Quantity Discounts Send self addressed stamped envelope 60 post age or call for information 312 637 4408 Midwest Electronics C O D orders accept ed 5143 W Diversey Chicago Illinois 60639 NO ILLINOIS ORDERS ACCEPT ED ZENITH SSAVI MANUAL Original man ual used by technicians Theory of scram bling schematics parts list repair For UHF and cable For speedy delivery send 15 00
156. dio Amplifier IC LM386 Requires a mini tile 555 and 556 timer ICs by building your own circuits PONS Lo wisis iuis ur RA we 12 95 mum of support components Perfect as an audio Written in simple language by Forrest Mims III Large 2 Text to Speech IC CTS256 AL2 Prepro output stage for speech synthesizer 400 mW out schematic diagrams 32 pages 4276 5010 99 grammed 8 bit processor translates standard put Adjustable gain 4 to 12 VDC 8 pin DIP Timer Project Parts For above Requires 276 174 ASCII characters into control data for the synthe 82763731 T ee TT 1 09 breadboard and 9V battery 277 061 11 95 Solder DIP Sockets Computer Game Connectors EE LowAs Ce 1 Experiment with Fiber Optics p Kies i Low As m Pkg of 2 Type Cat No Price 8 Pin 276 1995 2 59C Type Positions Cat No Each Learn the Basics of 14 Pin 276 1999 2 89 Lightwave Links Solder Sub D Male 9 276 1537 1 99 as 276 1999 2 896 Solder Sub D Female 9 276 1538 2 Eu E EST ERI Abele 9 S30 Optical Fiber Cable 3 meter approx 9 ft length of ae T 3 aee ine ae Tapas high quality optical fiber cable 276 228 5 99 VEN 276 1991 59 Solder Sub D Female 276 1548 Infrared Emitter Detector Set Use to send analog or 24 Pin 276 1989 79 Hood for Above _ 276 1549 digi
157. e P pica 249 reus Low Battery Volt indicator 225 SN7446N 16 s SN74148N 1B 89 SN74283N 16 139 ZB0A S10 0 40 Serra VO TxCB and RxCB Banded 11 95 2112 16 256x4 t450ns M i 249 72051PG 24 CMOS LED Stopwaich Timer 1495 SN7447N 16 75 SN74150N 24 149 SN74284N 16 295 Z80A S10 1 40 Serial V O Lacks DTRB 1195 3144N 18 1024x4 450s 129 8 995 7205EV Kt 24 Siopwatch Chip XTL Evaluation Kit 16 95 SN7448N 16 75 SNMISIN Ww 49 SIAN la ZB0A S10 2 A Serat 1 0 Lacks SYNCB 1195 2114N4 18 1024x4 450ns LP 1 65 8 1295 7206CuPE 16 Tone Generator 495 SN7454N u 19 SN741 4 4 r ZO0A S10 9 4f Senato 11 95 2114N 2 18 1024x4 139 8 10 95 7206CEVIKit 16 Tone Generator Chup XTI Evaluation Kit 7 95 52N 1 9 SN74365N 16 55 Z80B 4 CPU VK38BON 5 6MH 895 2114N 2L 18 1024x4 ious LP 169 85349 7207AIPD 14 Oscillator Controller 5 95 SN7459N M 35 SN74159N 36 399 SN743668 15 55 Z808 CTC 8 Counter Timer Circu 1195 2147HN 18 4096x 7ns E 4 49 7207 AEVO 14 Freq Counter Chip XTL Evaluation Kil 6 49 SN7460N M 39 SN74154N M4 1 49 SN7 367N 16 55 2808DART 40 Oual Asynchronous Rec Trans 1995 2148HN 10 10244 70ns 435 zur 40 4 Digit LCD Display Decoder Driver TTL compatibie 795 SN7470N 14 39 SN74155N 16 4g SN74368N 16 55 Z808 P10 4Q Parallel 1 0 interface Controller 10 95 T rom 4s ia bow MSOns iE 7 11MIPL 40 4D LCD Display Decoder Driver Microproc compat
158. e Multiplexer is a relatively low cost solu tion to the dilemma A sophisticated takeoff on the tradi tional multichannel switcher used in by gone days the Model 8001 takes the basic concept a bit beyond what has been avail able in the marketplace It has eight in puts and the usual controls and outputs provided by other multiplexers To these it adds some fancy circuitry that lets you select the number of channels you wish to be displayed For example it can 8001 SCOPE MULTIPLEXER E gi rT TAIG LEVEL GLOBAL SPECIALTIES CORPORATION be set up to display a single waveform or with the flip of a switch four or eight waveforms simultaneously Further more an incrementing circuit whose function is activated with the touch of a Switch lets you step through all input channels individually for examination of a single waveform at a time Multichannel signal processing phase t DPrrov MULTIPLEXER GAIN LEES RATE PUSH r3 2 V y CALIBRATE Qed BO T NA A 2mop n MULTIPLEXER CONTROL locked loop PLL operation TV tuning and sync displays and slower A D and D A converters can all the analyzed with in the Model 8001 s 10 MHz trigger 20 MHz bandwidth and 1 MHz sampling limitations With the instrument s 20 MHz bandwidth limitation though it is restricted to use on relatively low fre Continued on page 78 D 20 MODERN ELECTRONICS November 1985
159. e exposed end of the copper wire and to the conductive paint by means of a strip of tape or small alligator clip attempted to use the resistor shown in Fig 1 to measure variations in the forces on a rocket in my wind tunnel However the oscillations of the rocket prevented accurate measurements Nevertheless the basic resistor is easy to make and may have other more practical applications Figure 2 shows a do it yourself pres sure sensitive resistor made from a small disk of electrically conductive plastic foam of the kind in which CMOS ICs are sometimes shipped Conductive foam plastic can also be purchased from Radio Shack and other electronics suppliers Contacts for the conductive foam are fashioned from two disks cut from cop per foil available from a hobby or craft shop Unetched copper clad circuit board can be used in lieu of copper foil In either case the copper surface should be buffed with a pencil eraser until it is shiny to prepare it for soldering Solder alength of wrapping wire or standard hookup wire to each terminal The PSR is assembled by inserting the disks and the conductive foam into a Fig 2 A do it yourself pressure sensitive resistor COPPER DISK o0 r m a EN a Fat M is CONDUCTIVE ES x TD ONLUS NY PAM S PLASTIC Bre i EORUM ET Visits E COPPER DISK PLASTIC TUBE OUTPUT LEADS 56 MODERN ELECTRONICS November 1985 7 RESISTIV
160. e next When the acrylic has completely dried mount the components in their respective locations Then referring backto Fig 1 wirethecircuit exactly as shown Use only heavy duty 12 or 14 gauge stranded wire through out and maintain the white WHT black BLK and green GRN color code scheme throughout Connec tions to all filter suppressor module leads are made with wire nuts all oth er connections are soldered Double check all your wiring Then plug the Controller s line cord into an ac outlet Flip master POWER switch SJ to on and note that lights Leave SJ set to on and toggle on then off and then on the other switches on the front panel observ ing that their respective neon lamps come on then go off and then come on again Flip the POWER switch to off all neon lamps should extin guish indicating that all is well Disconnect the ac line cord from the wall outlet and finish assembling the enclosure Your Power Control ler is now ready to be put into M Absolute Reset from page 55 possibly damage it Apple clones and Hong Kong knockoffs normally do not need this inverter One prompt and low cost source of EPROM burning services is E TECH Services Box 2061 Ever ett WA 98203 206 337 2370 Be aware however that no legal EPROM burning service can directly drop ship you a ready to use EPROM Instead you must furnish them with an exact image of the code you wish to have burned
161. e to the far unused pin on the SPOT slide Switch Solder the other end of this wire to pin 28 after looping it Make sure that no solcer gets on the tip of pin 28 and that there is no Short to adjacent pin 27 chips and store Plug one adaptor into the CD ROM slot at D8 and the other adaptor into the EF ROM at D 10 as shown Plug your already programmed 27128 EPROMs into these Be sure that the CD EPROM goes in the CD slot and that the notch and dot on both EPROMs point forwards towards the 3o000000000000 2 RED WIRE Turn the Appie lle power off and remove the line cord at both ends Carefully remove the original CD and EF monitor them n protective CD ROM 2 2 aesespaeseeeaeaese e 2 eseaesaseaeseun ats 8 Fig 1 Howto install a dual monitor adapter in the Apple Ie computer You need two adapters for the modification at the time the switch is flipped and whether the code being used at this in stant is different in one monitor than it is in the other One really neat trick would be to use a pair of 27512s instead whose eight 64K banks are selected by an 8 way selector switch This would let you have an old monitor new monitor word processor spreadsheet graphics program and three other programs all resident in your ma chine for instant access A somewhat dif ferent adapter scheme would be needed
162. eks for delivery Many companies ship within a day or two If a shipment is delayed the seller must send you a notice within 30 days after receiving the order or before the shipping time noted in the solicitation that gives you a revised shipping date or 4 MODERN ELECTRONICS November 1985 notice that a shipping date cannot be de termined plus an option to cancel your order The notice should also provide you with a satisfactory way to respond such as a prepaid post card or an 800 toll free telephone number that can be readily and consistently used You should also be advised that non response is considered consent to a delay of 30 days or less If the revised shipping date is more than 30 days after the original date or it s Stated that a shipping date cannot be de termined your order should be automat ically cancelled if merchandise isn t ship ped within 30 days of the original date or you can cancel beforehand unless you re spond that you consent to the new ship ping delay date If you inform the seller that you agree to an indefinite shipping delay you still have the right to cancel at any time prior to shipping Refunds must be sent to you by first class mail within seven days after the order is cancelled except that credit card charges may be refunded within one bill ing cycle The reasoning here is fair since you haven t laid out any money yet A few other FTC rulings y
163. em has a unique tone sens II NEW PRODUCTS NER ing circuit that detects voice and data carrier and automatically passes the signal to the computer or telephone A built in 2 speaker lets you monitor the call while a built in clock calendar feature lets you keep track of call length on your comput er s video monitor screen In addition to the auto dial and auto answer features the JC 1200A is provided with an auto redial on busy feature and self test function Battery backup is provided to main tain clock time and to keep phone numbers stored in memory during power out conditions The modem is Bell 103 and 212A compatible and in terfaces to the standard RS232C port 289 95 CIRCLE NO 148 ON FREE INFORMATION CARD Portable Oscilloscope OK Industries has introduced a new dc to 10 MHz bandwidth oscillo scope small enough to fit in most briefcases and tool caddies It mea sures only 10 W x 7 D x 2 H 7 A ie 2493 299 v and adds only 2 Ibs to the carrying weight The compact Model 1010 provides 12 sensitivity ranges and 21 timebase ranges Vertical sensitivity is selectable from 10 mV division to 50 volts division and timebase is variable from 0 1 us division to 0 5 s division The mini scope includes internal and external triggering with sensitivi ty of 1 volt division internal and volt division external Coupling modes include ac dc TV frame and TV line A slope selec
164. er pin 13 goes low allow ing C5 to discharge through R 9 This results in a decaying sound upon turn off of each note If desired you 38 MODERN ELECTRONICS November 1985 can replace R79 with a 100 000 ohm potentiometer to permit adjusting for various decay envelopes Other than the address and data lines between the synthesizer and EPROM U4 the rest of the Mello Phone circuitry involves adjustments and song selection switching Speaker volume is adjusted by R21 which varies the drive level to Q4 Tempo resistor R2 sets the speed at which the synthesizer steps through the notes If you prefer to be able to vary the tempo you can replace R2 with a 1 2 megohm potentiometer The indicated fixed 680 000 ohm re sistor provides a quarter note dura tion of approximately 250 millisec onds Absolute pitch of the notes can be adjusted by varying the oscillator frequency at pin 27 by changing the value of R3 If you wish you can re place R3 with a 10 000 ohm potenti ometer The fixed 5699 ohm resistor results in a middle C frequency of about 185 Hz which is low by about Six semitones Switches 7 4 through S Dare used to select which of the 16 tunes is to be played These switches set the status of the upper four address bits of the U4 EPROM Thus the switches can select one of 16 pages of memory in U4 each page containing 256 bytes Upto 25 selections can be pro grammed per page but more compli cated
165. er and recorder among other non radar devices will not be detected by a radar detector naturally Moreover this method is dependent on a person starting a timer and is therefore inaccurate Insofar as company reputation is con cerned this information would have to be ferreted out Some companies bend over backwards to please purchasers Others virtually ignore you should you have a problem out of warranty and even in war ranty a O UU tronics package into such smallish housings as side mirrors and tiny visor mount packages some small enough to fit in a briefcase or pocket Is of course due in no small part to the use of integrated circuits and microprocessors It is also partially due to innovative antenna designs which have grown much more effec tive yet smaller over the years Among the types of antenna used by the latest radar detectors are the horn antenna multibeam printed circuit SUPERHETEROD NE GUL Palm 4 s GUL Industries Model 83S 7 SUPER LONG RANGE XK m POWER I BOTH LAMP BUZ ZEA f a est Mn Regency s Super Long Range XK antenna and a hybrid combining a half horn and microstrip antenna Although many radar detectors are designed to be permanently wired into a vehicle s electrical system others still use the same cigar lignter plugs or offer these as options which were used on most of the early radar
166. ever ac cording to September and October regis trations with the ITU certain RNB ser vices achieve 500 kW by using transmit ters in parallel 1745 2200 on 6190 6195 and 15270 1700 2200 on 11955 That ac counts for eight during this time period while five more 250 kW frequencies are available from 0800 to 0200 for the Ama zonian service 6065 6175 6180 9725 11780 Obviously not all these frequen cies can be used at once Deliberate overlooking is the rule on registration via Bob Padula Australian DX News Radio Jornal do Comercio Recife has had its license revoked so we can safely expect not to hear it on 6085 9565 or 9570 11825 and 15145 On the other hand a 10 year license has been granted to Radio Clube Radio Universal on 11735 in Goiania accordig to Claudio R Moraes His compatriot Antonio Ribeiro da Motta also notes that Radio Cultura Araraquara sometimes uses 3380 k Hz be tween 0800 and 0300 while 5 kHz up at 3385 Radio Congonhas is on the air at 0900 2200 but sometimes extends to 0125 for sports events Costa Rica On a visit to this beautiful but air polluted country we found out that Radio Universidad 6105 kHz is building a cubic antenna and plans to raise power again to 5 kW its manager says the local post office refuses to honor International Reply Coupons so those sending return postage to Costa Rican stations would be well advised to use a dollar bill or mint Costa Rican stamps
167. ewhere else logging onto a dif ferent subdirectory while using DOS Leave Desktop with the Quit command however and you land in GEMSYS one of the program s four directories you must type CD or add it to the startup batch file to regain the root directory GEM Desktop has its limitations While usable with 256K and two floppies it fairly demands 512K and a hard disk it takes 129K of RAM not counting room for DOS or applications It takes an af ternoon to set up Yourapplications must be installed for GEM and each program s files given the same extension fineif your spreadsheet filenames all end WKS but a nuisance if you use document names lke CHICAGO LTR and REPORT 70 MODERN ELECTRONICS Novernber 1985 NOV The manual s poor though its ap pearance is slick It details complex setup and printer font choices but omits some of Desktop s everyday commands or any of the basic DOS concepts from direc tories to disk formatting More important Desktop lacks the Mac s best feature a clipboard for link ing applications cutting and pasting ma terial between them And straining the 8088 to its limits GEM generally feels slow sluggish in redrawing windows or displays plodding when deleting files or installing programs On a fast Compaq Deskpro 286 or IBM AT with the En hanced Graphics Adapter or high resolu tion Hercules board GEM would be a pleasure On a plain PC or compatible it s a sincere for
168. example Cincinnati Micro wave s Passport remote 295 mea sures only 34 H x42 W x 234 D Then you should decide how the radar detector should be installed Would you like to have one with a visor clip mount ing a permanent under dash location a top of dash temporary mounting Do you want to plug the power line into your cigar lighter or have a fixed power con nection What you wish will determine in part the type of unit you ll buy Keep in mind too that some people are wary of doing their own permanent installation work required for remotes and for fixed hookup to the car s battery supply There ll be an installation charge for a professional to do this of course When you come to features the latest top of line detectors have anti false trig gering circuits aural and visual indica tors city highway switching volume controls mute switch automatic bright ness control system test to verify that the detector is indeed working and external speaker jack among other features Even among features there are sub cat egories For instance what type of signal strength indicator isincorporated into the detector to let you know about the strength of the radar transmission being picked up Is it an audio beeper flash fre quency LED indicator meter or com bination of a few Is there a different sound made to distinguish between an grille or other non metallic part at the front of a vehicle and a tiny hard wi
169. fre quencies was only 0 0028 while at 20 Hz and 20 kHz the THD measured only 0 009 and 0 007 respectively The 125 watt per channel rating of this receiv er is therefore a very conservative one Damping factor of the power amplifier was 80 referred to 8 ohms using a stan dard 50 Hz test signal Dynamic head room or the ability of the amplifier to produce short term power peaks in excess of its continuous power rating was very high measuring 2 3 dB above the rated Relative output dB 3 1AkHz B continuous power level of 125 watts per channel This means that for short bursts of signal such as might be produced by ac tual music programming the R 9 can de liver in excess of 200 watts per channel without significant clipping Phono input sensitivity for a l watt output was 0 23 millivolts for the MM moving magnet phono input option and 15 V for the MC moving coil op tion 15 millivolts of input signal applied to any of the high level inputs produced 1 watt of output Phono overload mea sured 145 mV for the MM cartridge op tion or 14 millivolts for the MC prepre amplifier input Frequency response for the high level inputs was flat within 1 dB from 20 Hz to 50 kHz Yamaha has incor porated a non switchable subsonic filter with a nominal cutoff point of 10 Hz which accounts for the dropoff at the ex treme low end At the bass extreme the 3 dB point was reached at 12 Hz High frequency cutoff t
170. from the free end of the line cord and separate the two conductors thus obtained Strip 4 of insulation from both ends of both conductors Tightly twist to gether the fine wires and sparingly tin with solder Then plug one end of each wire into the holes on the board labeled SO and solder Connect and solder the free ends of these wires to the lugs of SO Prepare the free ends of the conductors of the remaining Continued on page 83 November 1985 MODERN ELECTRONICS 47 Pocket Com Il This is THE transceiver for aspir ing James or Oick Tracys in our community Full 2 way transmis sion and a size that fits secretly into your pocket A great gift for any child Cat O 1 101 The Dick Smith Q1140 MULTIMETER Almost a complete test bench in one package no wonder it s our best selling multimeter With 100 000 ohm per volt sensitivity and ranges to cover every test set up this outstanding meter is all the hobbyist will ever need Measures transist ors Ico and Hfe for both NPN and PNP also good for diode testing and has an inbuilt transistor oscillator for capacitance measurement Cat 1140 76 5 g 4 One of the handiest de O vices to have in your tool box Check out both audio and F circuits harmo nics extend to many MHz simply and easily Often the quickest method of fault finding and one of the cheapest Self con tained with probe and earth clip
171. ged into SO Momentarily pressing S2 causes the lamp to in stantly turn on Choke L suppresses any spikes produced by the power triac and lim its interference with AM radio recep tion No safeguards against interfer ence need be made for FM and TV re ception since these media are im mune to this type of noise Construction This is a relatively simple circuit to build and thus lends itself to just about any wiring technique If you wish you can fabricate a printed cir cuit board for the project using the Then mount all components except R4 SI S2 and SOI exactly as detailed in the diagram shown at the right e 218 us lll Fig 3 Notein this close up view how two chokes are wired in parallel for Ll and the L bracket heat sink used for Q4 upper left use of a 16 pin socket for IC lower left and single screw that mounts the board on the box center actual size etching and drilling guide shown in Fig 2 If you do usethe pc board approach and decide to use a socket for C be sure to drill a small hole for pin 3 of the socket You will not be able to find a six pin socket in any of the catalogs or electronics parts stores So you will either have to use a 14 or 16 pin socket carefully trimmed to size or two strips of three Molex Soldercons If you forego us ing a socket you can simply clip off pin 3 of C and eliminate the need for an extra ho
172. gh to Yamaha s published figures When the receiver was switched to the DX or narrow i f mode in mono we measured 0 42 THD at all signal levels above about 40 dBf while stereo THD rose to around 1 0 Mode of tuning DX vs Local had a great effect upon FM stereo separa tion as you can see by looking at Figs 1A and 1B Both of these frequency sweeps were made for strong signal conditions and covered the range from 20 Hz to 20 kHz in a logarithmic sweep The two curves in each case represent undesired output from the unmodulated left or Fig 1 Separation characteristics for the Model R 9 sstereo FM tuner section shown in the local mode in curve A and DX mode in curve B A 10 2 20 3 amp 30 o 40 E co E 50 cc Frequency Hz 1 dB D 1 49 2dB R 57 7dB 1 UkHz Relative Output dB Frequency Hz dB D 1 33 2dB R 40 1dB 1 BUkHz November 1985 MODERN ELECTRONICS 13 PRODUCT EVALUATIONS Yamaha R 9 continued right channel when the opposite chan nel is fully modulated In the Local mode Fig 1A separation at mid fre quencies ranged from 49 2 to 57 7 dB which is more than adequate while in the narrow band or DX mode Fig 1B it was still adequate ranging between 33 2 dB and 40 1 dB depending upon which channel was measured Deviation from flat response for the fully modulated channel was
173. grammable array logic devices a new EPROM like replacement for conventional digital logic There s also a surprising amount of advanced electronic stuff here as well Texas Instruments weighs in with four publications Power Products Data Book with lots of goodies on power transistors power Darlingtons triacs SCRs and goodies like that MOS Memory Data Book that covers dynamic and static RAMs and EPROMs Field Program mable Logic Data Book that covers second sourcing of the Monolithic Mem ories PLAs and 7MS3020 Users Guide that describes in depth a new type of inte grated circuit called a digital signal pro cessor These are most handy for things like spectrum analyzers speech synthesis digital filtering and radar signal analysis Silicon General has a product catalog that includes such goodies as op amps modulators regulators protection cir cuits power drivers and a good collection of applications notes Then P essey has a thick Integrated Circuit Databook that covers all sorts of exotic linear ICs It in cludes log amplifiers low noise ampli fiers radio communication circuits specialized TV chips frequency synthe NAMES AND NUMBERS sizers telephone circuits hundreds of neat products in all Hitachi sent along a pair of specialized data books the HD65384 CRT Control ler Users Manual and the HD64180 Mi croprocessor Data Book No less than three data books come from Siemens the Power Semiconductors m
174. h makes it less prone to false alarms a common problem with many car alarms yet it will sense a voltage drop anywhere in the electrical System For example when a door is opened or a jumper lead is applied to the starter etc It is housed ina virtually waterproof d e cast case to minimise ingress of moisture or fumes and all connections are made tothe terminal Strip for easy installation and removal lt NUM Cat K 3253 ND s 2 As Microwave B Leakage Detector Microwave ovens are fantastic bul are they completely sate Yours could be leaking dangerous radiation Check it Out with this handy meter No batteries required r ae wee E SIDE a Lm BERKELEY REDWOOD CITY SAN JOSE d STORE HOURS MAIL ORDERS JONICS 558 1 800 332 5373 OVER 60 STORES IN 3 COUNTRIES DC Vol age 0 2 20 200 100 vt m yeE M DUTY MN een 100W LOAD Cat K 3095 continuous rated 85 7 E eror 49s STORES AT INCORPORATED IN THE STATE OF CALIFORNIA HANDLING ALL ORDERS 4 00 ee INSIDE USA 5 OF ORDER TOTAL e ORDER TOLL FREE EXE csse TOTAL MIN 3 00 Ho AT For FANIE lightweight UHF 2m beams TV amp FM antennas Why spend more on a heavy weight rotator when all you re turning is a small beam Our fully automatic rotator fs no slouch With 50kg vertical loading plus wind load of 0 25 SQ meters it s ready for most T
175. he 3 dB point oc curred at 100 kHz The range of the three sets of tone controls is shown in the multi ple sweep plots of Figs 3A and 3B for the bass and treble action and Fig 4 for the midrange tone control action Fig 3 Boost cut range of bass A and treble B controls Frequency Hz A BdB D L 8 0dB R 7 2dB iM dB D L 10 4dB R 9 9dB 10 UkHz 14 MODERN ELECTRONICS November 1985 Signal to noise ratio for the MM pho no inputs was 82 dB A weighted re ferred to a 5 mV input signal and a 1 watt output level Any reading above 80 dB would be considered a very good S N ra tio even if this were a Separate high priced preamplifier The MC phono input did almost as well with a measured S N of 76 dB referred to a 0 5 mV input and 1 watt of output This figure too is excellent and compares favorably with the figures obtained for the high quality separate preamplifiers having MC head ends Sig nal to noise for all of the high level in puts measured 83 dB referred to 1 watt output and 0 5 volt input In terms of rated output these figures are such that if a 2 0 volt maximum signal were fed to the high level inputs typical of CD player outputs and the volume control setting were increased to produce 125 watts the effective S N would be 116 dB Since that amount of dynamic range is well above that provided by compact discs or other digital program sources it is apparent that this recei
176. ics 53 43 Dielles accio ox ESENE m 96 Cov Ill 103 Digi Key Corp 95 Grantham College of Engrg 51 Heath Ochs aiwstacoeniads EE vita 178 ICOM America Cov Il 49 Information Unlimited 85 30 J amp W Electronics 69 47 50 Jameco Electronics 86 87 139 Jan Oe ova moo 10905 a n 85 85 MCM Electronics 63 McGee Radio aak asss raans si sese dd 92 NEI Schools cacy 245549 16 19 Phillips Tech Electronics 92 Phoenix Systems 94 48 Radio Shack 3 95 Sintec CO co 4240 3236 0095 du ed os rA 91 36 Smith Electronics Dick 48 49 122 Wahl Clipper Corp 21 Free Product Information Readers can obtain free information on products advertised by the above com panies as well as for some editorially mentioned products Simply circle the appropriate number printed below an advertisement onto the Modern Elec tronics Free Information Service card bound into this issue After filling in your name and address just mail the postpaid card Your request will be for warded directly to the advertiser with a mailing label prepared by our reader service department to ensure speedy re sponse SCIENTIFIC ATLANTA CABLE SYS TEMS New CM 04 descrambler for series 8500 8530 8520 boxes Receive all the
177. ientific games and more Catalog 3 00 refundable with first order Public Domain Library Box MDE Duncan Institute 18 Duncan Drive New Port Richey FL 33552 TI 99 4A Discount Softwares FREE Catalog from Microbiz Hawaii POB 1108 Pearl City H1 96782 TI 99 4A Software Hardware bargains Hard to find items Huge selection Fast Ser vice Free Catalog Tynamic Box 690 Hicks ville NY 11801 DON T BUY IT BUILD IT Unique book in structs you to build 35 interfaces for your C 64 16 95 postpaid MICROPRESS Box 388 Goleta CA 93116 ABSOLUTE Ile IIc RESET To the old monitor ROM Don Lancaster puts you back in total control Capture routines source code detailed instructions bonus book 19 95 SYNERGETICS Box 809 ME Thatcher AZ 85552 VISA MC 602 428 4073 MacPAINT SCHEMATICS PACKAGE A complete library of all 74HCOO0 series CMOS integrated circuits in two sizes along with bunches of other electronic symbols and schematic drawing aides 23 50 SYNER GETICS Box 809 ME Thatcher AZ 85552 VISA MC 602 428 4073 229 Quality Microwave TV Antennas Multi Channel 1 9 to 2 7 GHz 40dB Gain True Parabolic 20 Inch Dish a Complete System 84 95 Shipping incl tae Dealerships Qty Pricing Replacement Parts zu Phillips Tech Electronics umane P O Box 34772 Phoenix AZ 85067 Lifetime 8602 947 7700 3 DO Credit all phone orders WARRANTY MasterCard Visa e COU s
178. ing LI 200 1000 560 pt Paria Description 1 8 Watt 25 640 29500 680 p 891 5186 8 91 5 86 MMSB37 313i csaa 5 Mae ORG ea ao 14 Wen 25 34 130 po 14 omn solder teil goki FACZOON JACSION C9816 TR pany solder 1ail gold 1 2 Wart 25 350 16 00 1500 pt m Fo ros quartis an pream ae tow du F 61 M cat Du Kay 1TB0O pt JAST8BN C9818 13 pin solder tall goid 74S 189N C9820 pin solder tail gokd 1 8 Wet Carbon Flim Assortments P4202 1900 pi TEIN EPIO UM old AS112 5 each o the 73 stendard values in senes 99 89 R 4209 2200 pt JASZREN C9824 24 pin sakler tad gold sia P4205 3300 pt 10 1 2 1 5 1 8 22 etc through T DM A 1385 total pce 3206 4700 p 7AS2Z89N Conan 38 pin sokder tail yok C9840 50 pin sokder tail gold P4208 6800 pt 74S387N AB212 6 each of the 72 standard values in serras P4300 p ut ean 11 13 1620 2 4 mc through 910K Fax UOTA TASATAAN WIRE WRAP 1360 coral pcs P amp AX amp Qui PASSTSAN DIP SOCKETS i 1 4 Watt Carbon Film Assortments P430 OAT ut 7 a 87 60 ASIA sach ot tne 73 Standard values in sones Patt Tut 15 37 B 31 IS570N 74S571 S571N r sherds protie 1 0 1 2 1 5 1 8 22 eic through 1 0M __NPO NPQ NPO NPO NF PO NPO NPO Universa mounting 1365 tota pcs Peano TO pf 6 2B 47 3 74S8572N 7AS573N E pecieging capabilities ms Hate tuat Dated 5 each of the 72 standard visiuen in senes B P4402 15 pt 6 97 62 31 6 97 S 3 MM4164 16 4116N ND DIE through EA cac 1 1
179. int Denmark For many years Radio Den mark has been restricted from broadcast ing in any language but Danish If you d like to participate in a campaign to en courage resumption of English broad casts write to Roger Atkinson Cillesager 272 5 tv DK 2650 Hvidovre Denmark per Sweden Calling DXers The tentative fall schedule for North America is 1300 1400 and 1500 1600 on 11910 0000 0100 on 6010 or 9730 There is a quick English ID at opening and closing saying they broadcast only in Danish Dominican Republic Jeff White of Radio Earth lived here for several months He developed a deep affection for the Dominican people and concern for their poverty The result is a moving and eye opening book Santo Domingo Journal the royalties from which will go to Dominican humanitarian educational and developmental projects The 93 page illustrated softbound book is 7 95 from The Shortwave Store N4561 Circle Drive Cambridge WI 53523 Ecuador Due to its strong signal and lengthy hours in English HCJB is among the first shortwave stations some new SWLs discover While American style evangelism is paramount you still get some feeling for the country But this is greatly increased if you seek out their do mestic broadcasts in Quechua including nice Andean flute and harp music Peter Dillon of SPEEDX suggests 9745 and 11900 kHz in the 2230 2430 period Egypt Here are some of Radio Cairo s programs on 9475 and 9675 kHz for
180. is to use a nibbling tool If neither tool is avail able you re stuck with drilling holes and working like mad with a file to make the cutouts the proper size and shape Be careful to make the cutouts just the right size Once you ve finished making the receptacles cutouts drill the entry Continued on page 85 gt November 1985 MODERN ELECTRONICS 43 Project A Solid State Light Dissolver Controller smoothly dims or brightens lights automatically with the flip of a switch By Imre Gorgenyi ight controllers are always L popular projects not only be cause they are practical proj ects but also because they are fun to use imaginatively A good light con troller like the Solid State Light Dis solver described here will smoothly dim or brighten lights with the flip of a switch In addition to automatic flicker free fade in or fade out of lights the Light Dissolver provides full manual control and an instant on feature Also you can tailor its Circuit to suit specific needs simply by changing the value of resistors As designed the Light Dissolver can handle up to 300 watts of lighting resistive or incandescent or a small ac motor such as a fan To provide maximum safety and assure long op erating life the project must be housed inside a plastic not metal box with adequate ventilation Uses By now you probably have a good idea of some of the uses to which the
181. ist price 569 95 CE price 359 00 7 Band 20 Channel No crystal scanner Priority control Search Scan AC DC Sidelit liquid crystal display Memory backup Bands 118 136 144 174 440 512 800 950 MHz The HX2000 scanner operates on 120V AC or 6 VOC Scans 15 channels per second Size 3 x 7 x 1 Includes wall charger carrying case belt clip flexible antenna and nicad batteries Selectable AM FM modes MX4000 HX2000 MX7000 CIRCLE 26 ON FREF INFORMATION CARD NEW Bearcat 8O0OXLT K List price 499 95 CE price 329 00 12 Band 40 Channel No crystal scanner Priority control Search Scan AC DC Bands 29 54 118 174 406 512 806 912 MHz The Uniden 800XLT receives 40 channels in two banks Scans 15 channels per second Size9 A x 4 x 12 OTHER RADIOS AND ACCESSORIES Panasonic RF 2600 K Shortwave receiver 179 00 Panasonic RF B300 K Shortwave receiver 195 00 RD95 K Uniden Remote mount Radar Detector 139 00 RD55 K Uniden Visor mount Radar Detector 119 00 BC 20 20 K Bearcat 40 channel scanner 274 00 BC 210XW K Bearcat 20 channel scanner 219 00 BC WA K Bearcat Weather Alert 39 00 DX1000 K Bearcat shortwave receiver 459 00 PC22 K Uniden remote mount CB transceiver 99 00 PC55 K Uniden mobile mount CB transceiver 59 00 Z10 K Regency 10 channel scanner 139 00 Z30 K Regency 30 channel scanner 154 00 Z45 K Regen
182. izabeth Ryan Art Director Barbara Scully Artist Pat Le Blanc Richard Kishanuk Phototypographers Hal Keith Hlustrator Larry Mulvehill Photographer Leonard Feldman Glenn Hauser Don Lancaster Forrest Mims III Stan Prentiss Charles Rubenstein Contributing Editors BUSINESS STAFF Richard A Ross Publisher Art Salsberg Associate Publisher Dorothy Kehrwieder General Manager Anthony C Sparacino Newsstand Sales Director Arlene Caggiano Accounting Cheryl Chomicki Subscriber Services SALES OFFICES Modern Electronics 76 North Broadway Hicksville NY 11801 516 681 2922 Eastern Advertising Representative Paul McGinnis Company 60 East 42nd Street New York NY 10017 212 490 1021 Midwest Advertising Representative Market Media Associates 435 Locust Road Wilmette IL 60091 312 251 2541 Ted Rickard Western Advertising Representative JE Publishers Representatives 6855 Santa Monica Bivd Suite 200 Los Angeles CA 90038 213 467 2266 Jay Eisenberg Director San Francisco 415 864 3252 Denver 303 595 4331 Offices 76 North Broadway Hicksville NY 11801 Tel ephone 516 681 2922 Modern Electronics ISSN 0748 9889 is published monthly by Modern Electronics Inc Application to mail at second class rates pending at Hicksville NY and other points Subscription prices payablein US Dollars only Domestic one year 16 97 two years 31 00 three years 45 00 Canada Mexico one year 19 00 two years
183. l and cer tain cards will hang the machine and Continued on page 85 To preserve your e of Mill ELECTRONICS THE MAGAZINE FOR ELECTRONICS COMPUTER ENTHUSIAS ENTHUSIASTS e r logy QUIETER Brokocasr e Srem EO ADVAN NCED FU RNAC RONTROLLER BOOSTS ATING EFFICIENCY d ve imp 58R ODg For P Ag 3 Wonder Cos e conoci 999 O acte The Amiga iC 3 LY HS ETUR Pro fects 4 ADblicatiors Mester ree atm ef y Ericssons Pert ps Arai 9r Clutter jeu Cire Smite her Cures periment with Soun ALE A choice of handsome and durable library cases or binders for your copies of MODERN ELECTRONICS Both styles bound in dark blue library fabric stamped in gold leaf Cases Each case hold 12 issues Price per case 5 95 three for 17 00 six for 30 00 postpaid Binders Each binder holds 12 issues Issues open flat Price per binder 7 50 three for 21 75 six for 42 00 postpaid Canadian and foreign requests should also include an additional 2 50 per item for shipping costs To Jesse Jones Industries Since 1843 P O Box 5120 Dept P Com Philadelphia PA 19141 enclose my check or money order for Please send me MODERN ELECT RONICS D Files O Binders Please allow approximately 4 weeks for delivery Please Print Name Address 1 1 1 1 cop State Zip November 1985 MODERN ELECTRONICS 55
184. l with a quick reference guide containing all necessary commands One disk is the Master while the other is your Daily disk The Master disk contains the installment part of the program It introduces you to the pro gram and then asks along list of questions relating to your medical nutritional and behavioral status Your answers are re corded and taken into account when the program offers suggestions The Daily disk keeps track of your weight food in take and exercise A monochrome or col or video monitor can be used The latter requires a color graphics board The manual that accompanies the pro gram is not documentation that shows you how to use the program Instead it contains almost 50 different reading as signments that are coordinated with the diet program You might think ofthe disk program as laboratory notes while the manual contains your homework reading assignments It s an informative guide to information on helping the user learn about old eating habits and how to cor rect them as well as motivational and controversia nutrition and health issues such as facts concerning sodium and arti ficial sweeteners The computer program analyzes your behavioral and nutritional habits based on data you input It also helps you to plan meals and stick to those choices It contains a database of over 900 foods complete with serving size and caloric in formation and any other food can be ad
185. lastomeric pad with contacts ABS bodies and double shot motded keys Max rating Stock No of No Pins 10 49 11055 4 35 11056 4 50 11057 5 95 11058 10 50 Ol a levered arm Extremesy tast on and ott wilh low naise Normally open rated 115 VAC 1 6 amp 30 mil iohm re Sistiance 61S radius by 160 thick Stock No 1 9 10 amp Up 12098 1 42 1 28 sus CUB I and Sug 9 Digit LSI Counter Modules with LCD Readouts SURU are ke M and Associated quality comp Counter Modules win Mounting Azaan Blies 51070 LCD readout Moduies piug in p c board Stock No 51071 Complete function evaluation kit Stock No 51070 contains p c board 4 5V battery and variable frequency oscillator to supply train Of COunt pulses Stock No 51070 has LATCH RESET and Stock No Description Complete Function Evaluation Kit includes batteries but does not include SUB CUB f wi 1 display counter 3 51071 Mounting P C Board S ont 51072 SUB CUB display LP a er module Onty m4 SUB CUB II display p62 195 counter module only SUB CUB II Prica 45 00 7 50 18 00 51073 24 00 51074 100 LY 1010 1 24 99 OPTEL Co s with pins Stock No 47005 ii BBBB 7 47006 Stock No 47006 true row to row t 47007 spacing One side is r ort S B B Stock No 47007 tor 300 centers Fliptoot ONE TOOL DOES over fordevices 8 thru 40 PINS Scotchtlex Breadboard Panel Bezel Evaluation Kit for SUB
186. le in the board Mount the components on the pc board exactly as shown in the com ponents placement diagram in Fig 2 making sure that the leads of the transistors go into the proper holes see the detail drawings at the lower left of the components placement diagram Note also the orientations of DI Cl and RECTI Choke L consists of two 100 nH r f coils Placethetwo chokes side by side and wrap a couple of turns of the leads of one around the leads of the other so that the chokes are in paral lel Solder the connections and clip off the excess lengths from the twisted leads Then bend the un clipped leads and install the choke pair on the board via the L holes see Fig 3 for mounting details Mount the transistor about 4 and the Q4 triac about 54 above the top surface of the board Make sure the rear metal face of Q4 is oriented away from L and parallels the long edge of the board Prepare seven 6 lengths of hook up wire by stripping 4 of insulation from each end Plug one end of these wires into the holes labeled R4 57 and S2 The other ends of these wires will be connected later You have two choices with regard to the ac receptacle into which the lamp load plugs One is to use a chas sis mount receptacle and run lamp cord between it and the appropriate points on the board the other is to use a cut off section of extension cord that enters the cabinet through a side wall see lead photo The latter i
187. listeners FRG 8800 Scan the airwaves with a number for the serious listener Yaesu s serious about giving you better ways to tune in the world around you And whether its for local action or worldwide DX you ll find our VHF UHF and HF receivers are the superior match for all your listen ing needs The FRG 9600 A premium VHF UHF scanning communi cations receiver The 9600 is no typical scanner And its easy to see why You wont miss any local action with continuous coverage from 60 to 905 MHz You have more operating modes to listen in on upper or lower sideband CW AM wide or narrow and FM wide or narrow You can even watch television programs by plugging in a video monitor into the optional video output Scan in steps of 5 10 124 25 and 100 KHz Store any frequency and CIRCLE 19 ON READER SERVICE CARD Dealer inquiries invited related operating mode into any of the 99 memories Scan the memories Or in between them Or simply dial up any frequency with the frequency entry pad Plus theres more including a 24 hour clock multiplexed output fluorescent readout signal strength graph and an AC power adapter The FRG 8800 HF communica tions receiver A better way to listen to the world f you want a compiete communications package the FRG 8800 is just right for you You get continuous worldwide coverage from 150 KHz to 30 MHz And local coverage from 118 to 1 4 MHz with an
188. lit liquid crystal display Digital Clock Frequency range 30 50 144 174 440 512 MHz The new handheld Regency HX1000 scanner is fully keyboard programmable forthe ultimate in versatil ity You can scanupto 30 channels at the same time When yOu activate the priority Control youautomat ically override all other calls to listen to your favorite frequency The LCD display is even sidelit for night use Order MA 256 K rapid charge drop in battery Charger for 79 00 plus 3 00 shipping handling includes wall charger carrying case belt clip flexible antenna and nicad battery Order now NEW Bearcat 100XL K List price 349 95 CE price 229 00 9 Band 16 Channel Priority Scan Delay Search Limit Hold Lockout AC DC Frequency range 30 50 118 174 406 512 MHz The world s first no crystal handheld scanner now has a LCD channel display with backlight for low light use and aircraft band coverage at the same low price Size is 13 x 7 2 x27 amp The Bearcat 100 XL has wide frequency coverage that includes all public service bands Low High UHF and T bands the AM aircraft band the 2 meter and 70 cm amateur bands plus military and federai government frequencies WOw what a scanner Included in our low CE price is a sturdy carrying case earphone battery charger AC adapter six AA ni cad batteries and flexible antenna Order your scanner now NEW Regency HX2000 K The World s First8BOO MHz Handheld Scanner L
189. ll conventional ignition vehicles doesn t work real well on diesels Cat A245 ORDER TOLL FREE 1 800 332 537 a 4 u A 33 sf Y q M eet y n d ie 9308 Cat Q 1440 Beautifully made We believe this multimeter must HW Oe the best value available in America President Ike insisted that we find a good quallty LCD muliti meter that would sell for less than 3000 We worked at it for 3 months and found one SPECIFICATIONS AC Voltage 0 200 500 vo ts RMS DC Current 0 2 20 200 mA Resistance 0 2K 20K 200K 2MEG Ohms 200 hour battery life Full overload protection and diode check lunchon Low low pnce and guaranteed LOWCOSTCAR PROTECTION ignition Killer Ingenious but simple cir cuit based on a555 timer that literally kilis your car ignition and then re sets itself making the thief think something is wrong with the engine The theo rv is hell then go and pinch someone else s car instead Cat K 3255 Cat K 3255 r Universal Test Lead Set The ultimate test lead set for the professional Superb quality coiled test leads for ease and conven ience 18 different adaptor probes and plugs Multi way test leads makes it simple to carry out any test you desire Screw in connector ends make this suitable for any meter Cat W 4528 auc OMY One of the most sophisticated yet simple alarms around It uses a triggering technique whic
190. ly as much as this en tirereceiver What s more the Local DX automatic feature worked flawlessly al ways providing optimum FM reception for a given set of incoming signal condi tions We logged more than 63 usable sig nals in our test location using a good out door rotatable directional antenna The tuner section rarely switched into the DX mode in our listening location so we were able to take advantage of the ex tremely low distortion and the excellent stereo separation afforded by this tuner s wideband Local mode We hooked up a good video monitor to the appropriate terminals on the back of the R 9 along with a video camcorder and a VCR Dubbing from the camcorder to the VCR was simple and all the while we were able to monitor what was happening on the connected monitor The R 9 served as an excellent switch board or control center for every imag inable type of audio or video program source When we played my most dynam ic CDs through the R 9 its amplifier sec tion never ran out of power even while driving my low efficiency reference speaker systems Continued on page 20 Fig 5 Curves show action of the variable loudness control Frequency Hz dB D L 24 9dB R 5 3dB 1 Mk November 1985 MODERN ELECTRONICS 15 NRI Trains Y You T Trains You At t Home As As You u Build GET THE KNOW HOW TO REPAIR EVERY COMPUTER ON THIS IBM is a Regi
191. m of MacFlattery Still if you re setting up a system for office novices to run programs GEM Desktop is a good performer at a bargain price 49 95 though I d spend another 100 and buy it with the neat looking GEM Draw graphics package first in a series of complementary GEM programs For real multi tasking integration I m looking forward to DOS 4 0 and Micro soft s long awaited Windows C uA H 2 o j EE di E Will many software vendors rewrite their programs to work with DRI s and Microsoft s interfaces I m looking for ward to finding out Flunking the Screen Test Does it seem eveyone you meet these days is carrying a Data General One I haven t noticed it either The mini maker s baby was the first briefcase portable with a 31 microfloppy drive and 25 line 80 column LCD but its dim screen and steep price have kept it in the sales cellar despite high level of IBM compatibility Now Kaypro best known for low cost CP M suitcases has decided to undercut Data General Compared to its otherwise similar predecessor the Kaypro 2000 has three advantages asexy Star Wars design an 11 pound brushed aluminum wedge with a disk drive that pops up for loading and folds flat for use a stack of free soft ware mostly MS DOS versions of Micro Pro CP Mremainders like WordStar and CalcStar and a 1 000 price cut to 1 995 with 256K RAM and one 720K mi croflopp
192. mbols for word processing database management or a dozen other types of programs At the top of the screen a bar offers pull down menus for juggling files changing de faults or calling a clock or calculator Just as with Macintosh windows fold ers and files can be opened closed or dragged around the desktop by moving a mouse and clicking or double clicking a button It s barely possible to use GEM from the keyboard awkwardly tapping the cursor arrows and Home key Mouse Systems PC Mouse or Microsoft s nois ier unit is really essential Desk File View Options CO NGEMURITEN 296 bytes used in 2 i _C GEMPAINTN Seco 532914 bytes used in 18 hs ors m ee LES TEXT Digital Research s Graphics Environment Manager GEM software turns the screen on Bac n 7 a A5 BUS Fr labii r tx HL CALOTUSN 4 223286 bytes used in c tae t ea att IBM PCs and compatibles into a near clone on Apple s Macintosh Deleting a fileis as simple as dragging it to the trash can starting work on a file automatically loading the program that created it is a point and shoot snap When you re done the command that normally returns to DOS returns you to Graphics Environment Manager An Enter DOS Commands option lets you type commands directly Type EXIT at the DOS prompt and you re in Desktop where you left it even if you went som
193. ments to check the value of a component too simply by plugging the known fre quency and measured impedance in to the appropriate reactance formula and solving for the unknown value One more function that the bridge can perform should prove of valueto you That is the ability to indicate Computer System Power Controller fom page 43 Photo shows details of controller s rear panel Ac power cord enters through and ac receptacles mount on panel So too does a circuit breaker hole for the ac line cord at one end of the rear panel If you plan on using a circuit breaker drill its mounting and reset button holes in the rear panel too Then work on the front panel Here you need two holes for each lamp switch combination un less you opt for the more expensive lighted push push switches men tioned in the Note at the end of the Parts List in which case you need only one hole for each 2 2 through Sn In combination Determine where to mount the EMI filter suppressor module Make sure that it is completely iso lated from all other components Then drill its mounting holes This done deburr all holes Label all switch lamp pairs on the front panel and all ac receptacles on the rear panel with their appropriate legends using a dry transfer lettering kit Then spray two or more light coats of clear acrylic over all exterior surfaces of the front and rear panels Allow each coat to dry before spray ing on th
194. ms to match the offensive capabilities of the newest police radar devices They would be infinitely more sensitive to the presence of elusive police micro waves in order to warn of a speed radar trap in time Enhanced sensitivity in general does increase the odds of ferreting out the more difficult to detect po lice radar signals but it does not come without cost Ultra sensitive detectors all too often experience an unnerving problem that radar detec tor manufacturers are still trying to enginer out of their units today false triggering False triggering is simply your radar detector warning you of the presence of police radar when ac tually none exists Unfortunately other devices also operate on the very same frequencies used by police radar Among these offenders are microwave security systems phone relay stations and garage door openers Some radar detectors also leak signals that can trigger a radar warning on other detectors An answer provided by a number of radar detector manufacturers was to build in simple controls that would enable a driver to reduce X band Electroalert s Superhet XK detector sensitivity in urban areas where such signals are more likely to be found The city highway switch found on some radar detectors does the desen sitizing job automatically and at tempts to find a median where both tasks can be accommodated as best as possible As a rule of thumb if a radar detecto
195. ms Functon 1 Pree SN7400N i4 29 5 EX wu BI ua scs 2 2816A 24 2048x8 16K E2PROM 350ns 12 95 SN74180N 16 58 Features On board Address Data Latches Auto Timed Byte Write on Part No Description Price Part No Description Price SS eh coni RR 21014 1200ns CMOS SRAM 99 6264LP 15 iio suu 7 49 SN7402N m 29 SN7475N 18 45 SN74161N 15 59 CMOS USES LESS POWER chip timer SV Erase Write Read Optional High Voltage Erase Program guam uo B we s 3 waew s 23 reg 9 95 MC146818 reai rime ccock 3 nam 7 95 12v22v Power Up Down Write Protection Auto Erase betore Were Bc ud X BU X MIN d 450ns CMOS EPROM The 2816A is an ideal nonvolatlle memory providing in system alterability SABE d WEM M 48 Bes 6 E 21 1 28 25 250ns EPROM 5 95 with the same ease and with the same features as 2Kx8 Static RAMS SN7407N l4 59 SN ABIN 16 55 SN74166N 15 69 41 64N 200 ORAM 9 9 95 SN7408N 14 29 SN7485N 16 59 SN74167N 16 295 igi s SN7409N 14 35 SN7486N 14 39 SN74Y7QN 18 159 Digitalker 5N7410N 14 29 SN7489N 16 225 SM74172N 2 495 41256 150 1501s Ram 6 49 0 Applications Teaching ads appliances clocks automatwe elecommonications
196. n 48106 U S A Add 7 00 per scanner for U P S ground shipping and handling in the continental U S A For Canada Puerto Rico Hawaii Alaska or APO FPO delivery shipping charges are three times continental U S rates If you have a Visa or Master Card you may call and place a credit card order Order toll free in the U S Dial 800 USA SCAN In Canada order toll free by calling 800 221 3475 Telex CE anytime dial 810 223 2422 If you are outside the U S or in Michigan dial 313 973 8888 Order today Scanner Distribution Center and CE logos are trade marks of Communications Electronics Inc f Bearcat is a registered trademark of uniden Corporation t Regency is a federally registered trademark of Regency Electronics Inc AD 090385 K Copyright 1985 Communications Electronics For credit card orders call 1 800 USA SCAN COMMUNICATIONS ELECTRONICS INC Consumer Products Division P O Box 1045 D Ann Arbor Michigan 48106 1045 U S A Call800 USA SCAN or outside U S A 313 973 8888 November 1985 MODERN ELECTRONICS 5 Wi MODERN ELECTRONICS NEWS iiia M68000 DESIGN KIT A design kit with MC68000 and MC8008 microprocess ors and six supporting devices as well as application notes and doc umentation is being offered by Motorola s Micro Products Div through NS distributors for 9 68 THE PICOCASSETTE Dictaphone Corp introduced the smallest magnetic tape medium moving from a microcassette to a picocassette Measu
197. n the box lid Remove the L bracket from the heat sink and carefully drill a hole through the marked location Mount the L bracket via its short leg to the box lid with machine hardware Then secure the bracket to the heat sink with machine hardware This done mount the lid on the box and affix four rubber feet to it near the secur ing screws The project is now ready to be put into service ME SHORTWAVE PROPAGATIO HANDBOOK Second Edition You have a receiver you ve got an antenna now let the experts share with you the secrets of long distance communications Take advantage of signal propagation techniques Whether you are tuned in with a scanner a communications receiver a Ham or CB rig this is the vital information you need to have The all new revised 2nd edition of The Shortwave Propagation Handbook is here Authors W3ASK and NAXX explore the whys and wherefores of how radio signals be tween 3 and 300 MHz travel over long distances under the influence of sunspots the ionosphere meteor trails auroral ionization sporadic E scatter phenomena and other factors Through fascinating text amply supplemented by many charts pho tos and illustrations you find out how to predict and use to your communications advantage the various types of skip openings whether you re using a scanner to monitor the low or high VHF bands an HF communications receiver ortransceiverto pinpoint that hard to hear station or are a 27 MHz ope
198. nd the video signals can then be directed to a video monitor which can also be connected to this central Yamaha component As an audio receiver the Yamaha R 9 is as sophisticated as any audio only re ceiver we ve tested Many of the unique and thoroughly valid features introduced by Yamaha in some of its earlier designs have been carried over into this A V unit such as continuously variable loudness control separate and apart from the reg ular volume control and a separate Record Out selector that permits you to listen to one program while recording another Rated at 125 watts per channel over the entire audio range with lessthan 0 015 THD when connected to 8 ohm loudspeaker loads the receiver employs digital frequency synthesized tuning for AM and FM listening and a 16 station preset capability It is also one of only a few currently available receivers that in cludes a wireless remote control In terms of circuit innovations the Ya maha R 9 designers haven t skimped either Catering to those purists who maintain that Class A amplifier opera tion still yields purer sound that even the best Class AB amplifiers can deliv er the R 9 has a switch which when de pressed converts the output stages of its PPRP ETT WAI wen wo e i RT it Dn BL aem sum y E LL E 34067 amp T1 T3 1E An 2I Ee LY BA VER TI re i UO er ra n vm e amama i
199. ne Assembly Aid Sys tem DZAAS and waits for the rest of the group to find him The other paratroopers who wear the one Ib receivers on their wrists tune them to a predetermined frequen Cy and turn around until the receiver s LED lights up They then move in that direction until rejoining the group Three general officers who partici pated in a hide and seek DZAAS dem onstration given at Fort Bragg NC were enthusiastic about the results They note that it eliminates confusion at night and greatly speeds up assembly Student trainees with wrist receivers quickly found a project leader hiding in the woods with an operating transmit ter for example It was even tested in downtown Salt Lake City Utah where it took a bit longer to find the transmit ter due to the many buildings but it worked fine there too Now if we can get them to send us the schematic so that we can make em and find our wives in a department store Call for your FREE 1986 CATALOG SUBSCRIBER SERVICE CHANGE OF ADDRESS MUR i MODERN ELECTRONICS 76 N Broadway Hicksville NY 11801 Planning to move Please let us know six weeks in advance so you won t miss a single issue of MODERN ELECTRONICS Attach old label and print new address in space provided Also include your mailing label whenever you write concerning your subscription to ensure prompt service on your inquiry ATTACH LABEL HERE PLEASE PRINT CIRCL
200. ng for FREE COMPLETE CATALOG which includes coupon tor 1 00 OFF purchase Tl LOW PROFILE SOCKETS Tin plated copper alloy 688 contact pins with gas tight seal Stock No Pins 1 99 No No Pins 1 24 25 99 999 11301 8 40 11201 11302 14 59 11202 11303 16 11203 11304 11204 11305 11205 12 VOC 20mA 11306 11206 m Contact Res less than Stoch Opera ating Se t l rond i died 500 ohms Bounce less 4745 orce ravel inan iO m sec TOURS DER 11209 SINGLE ROW Press enge Dit Displays Common Cathode SOCKETS gm BE cy oo 12082 Red 1 12 99 Strip of 25 collet sockets pins d een 4 ES mount odd center components ellow easily Goid plated contacts 12089 Orange 2 08 1 84 Both styles break Stock No 1 24 25 50 WD eh De Bad ud Socket tor Above able to any number Fx l y of contact positions 10240 1 70 1 50 1 30 POINT POINT fd Stock wanted No No Description 11310 Bag of 100 contact solder taii pins 4 95 4 45 3 95 11311 Gegorttoo 02 Stock wire wrap pins 11 95 1075 9 50 E No and bottom ol IC and cam actuated true zero Bsg 5Begs 10 Gags se Won t shake M 7 22 insertion tin plated solder pe wem 1 tail pins capable of being plugged into dip sockets a EE E including wire wrap WILD ROVER Touch switch capsule Operating motion is QO5 without the use TF Stockh 3 wrap 499 Gon gt 3 X 4 Elastomeric Keyboards r Each keyboard has a p c ard e
201. nostic routines may be cancelled at tne touch of a key Compiete with instructions Key a b JE877 DRV 1 Applesurance Il Parallei Printer Card For Apple II H and e The JEB8BO Printer interface board 1s an intelligent interface 1o most of today s popular dot matrix graphics printers The JEB8O is tuhy compatible with Apple CP M Appie Pascal or FORTRAN and most other operating systems and software packages available for Apple ll il and e The JEBBO is shipped contigured for the Centronics standard and can be re configured for other standards il necessary Advanced teal printing features include video screen echo GN or OFF auto disable hneteed atte carnage return set clear the 8th bit of the oulput dala sel lef margin and morel Complete with instructions Key a b JESB0 i 2m d ER eee 59 95 Use as a second disk drive Single sided Single double density Full height drive 48 TPI Documentation included Weight 3 7 tbs MPSIS 89 95 EXPAND TRS 80 MEMORY TRS 80 MODEL I III Each Kit comes compiete with eight MM5290 UPD4 16 4116 16K Dynamic RAMs and documentation for conversion Mode 1 16K equipped with Ex pansion Interface can be expanded to 48K wih 2 Kits Model Ill Can be expanded trom 16K to 48K using 2 Kits Each Kit will expand computer by 16K increments TRS 16K3 200ns Modelll 6 29 TRS 16K4 250ns Model 1 5 49 PO RE fies
202. nterface Controle 205 RESO 2l Wd 435 FEO2020 a0 4 Ogn LCD Dsoiy tx 723 amp 72TIMIPL SN 438N ld 49 SN74132N M 59 SN7419 N M 75 Z80 S10 40 Seral VO IXCB and RxCB Bonded 11 49 MM5298 3 WB 8192x 200ns l 99 FE02030 40 3e Digit LCD Orsplay for 7106 amp 7116 1495 SN7439N 14 79 SN74136N M 69 SN74198N 24 119 Z80 S10 4 40 Senaal 1 0 Lacks DTRB 1149 8118 16 16384x1 120n5 5 Only Req 39 705m 28 CMOS Precision Timer 1495 SN7440N 16 19 SN74149N 16 89 SN74199N 24 1 49 280 S1072 40 Sena t O Lacks SYNCB 1 49 41256 150 16 X3 Max 150n5 649 70457 VAI 28 Stopwatch Chip XTL Evaluation Kit 1995 SN7441N 16 89 SN74M2N 16 395 SN74221N 16 11g 795 09 90 Senat VO els Ew ad T n 4 3v Digt A D LCD Drive 10 49 SN744QN 1 amp 45 MAUN n 3 SUDAN ites e 280A 40 CPU MK3B80N 4 780C 1 4MHz 2 95 static s 7T10EEV K 40 IC Circul Board Display Evaluation Kit 4695 SN7443N 18 125 PE ZB0A CTC 28 Counter Timer Circuit 3 95 S 7107CPL a0 35 Dd A D LED Drive 10 95 144N 24 395 SN74273N 20 195 ZBOA DART 4D Dual Asynchronous Alec Trans 995 210 22 28 cd ay Mi 195 7i97EV MA 40 IC Circuit Board Display Evaluation Kit 46 95 SN7444N 16 125 SN24M5N 16 65 SN74270N 20 249 ZBQADMA 40 Drect Memory Access Orcui 1295 09 E lio ce TI 83 rus 40 39 Digit VD LCD Ds HLD 1095 SN7445N 16 69 SNAMMIN 16 129 SN74279N 16 79 Z80A0 40 Parallel VO intertace Controle xe NDA i ace ee
203. nthly magazine for electronics and computer enthusiasts Covering the entire spectrum of these fields you ll gather insights in every important area to help you make buying decisions for work and play purposes improve performance of your present equipment increase your electronics competence and add to your practical and intellectual knowledge of electronics and computers To be sure you get this valuable information delivered to you regularly and share the experiences of our writers and edi tors Forrest Mims Len Feldman Stan Prentiss Charles Ru benstein Glenn Hauser and many others you can subscribe to MODERN ELECTRONICS today As a Charter Subscriber you ll save 45 off the newsstand price when you buy a one year subscription for only 12 97 Or save 51 when you sub scribe for two years at 22 97 Just fill out the coupon and mail with your check money order or credit card information Visa or MasterCard to enter your Charter Subscription Do it today to ensure earliest delivery MODERN ELECTRONICS 76 North Broadway Hicksville NY 11801 Please send me Modern Electronics for O 2 Years O 1 Year Name Stteet a S City St D2 c 9 4 0 2 Years QA issues 22 70 1 Year 12 issues 12 97 Charge My Order To Payment Enclosed O MasterCard AME a O VISA My account number is We strive to bring you the best catalog in
204. o maintain a reasonably high net impedance across the output terminals or the power amplifiers With only the Speakers A and Speak ers B switches depressed normal opera tion both sets of speakers in parallel across the output terminals is maintained Tuner Measurements In testing the FM tuner section of the R 9 receiver we quickly established that the major difference between the Local and DX tuning modes was not so much a difference in sensitivity as a dif ference in selectivity In other words dur ing FM reception the Local setting on this receiver corresponds primarily to the Wide i f Bandwidth setting often found on other tuners and receivers whereas the DX setting provides a higher alternate channel selectivity figure for zeroing in on weaker stations that might otherwise be interfered with by close by strong stations Using the Lo cal setting best S N in mono was 78 dB while in stereo it was 74 dB These are better than average figures for receiver tuners Harmonic distortion at strong sig nal levels was a remarkably low 0 06 for mono and a nearly as low figure of 0 075 in stereo Usable sensitivity measured 12 dBf improving somewhat to 10 8 dBf when we switched to the DX position Fifty dB quieting sensitivity measured exactly 14 5 dBf in mono which is su perb and 37 0 dBf in stereo which is about average Both are close enou
205. oen e aege c cw Understanding c OM AME REVIEW of ON nue ae Q t 73 s is DC Power Q9 V 98 ex An Australian written and yor ete Vae 409 published book intend S a eO 19 cs a tor Ge enan oN o goupplies ats e SM co i Ace ca ed for tech students in FT ce pers electronics electrical en 40 25 a gineering fields but has aas usta con agree S a mine STU Rt anie 10 qoe V ent ors the hobbyist too Covers ov ated an everything from intro on Ww ov duction to rectifiers to Cat B 3623 se gt ae ONLY fh A Switch mode supplies Experimenter s Handbook 9 sud esae 2 A hands on guide to um ase Pus V 9 a C9 derstanding and applying eV ec V e jt modern laser and laser e a WC an ER INTO SERED Stereo Simulator Wish those old video movies had modern stereo sound This low cost gadget turns almost any mono signal into amazingly good synthetic stereo Cat K 3421 34495 with data plans and op erational M QN technology Gives all the OY WU i background and theory V S needed to build actual Sv ons working lasers including cow Vi actual projects complete M ow tos Cat B Cat B 3900 Now gives even better performance than be fore with circuit mods enabling high efficiency amp stabilty plus special radial fin design heat sink and die cast box to get rid of that unwant ed heat Ideal for use in a
206. ograms and validates EPROMs Checks for property erased EPROMs Loads data into internal RAMs by keyboard EPROM or computer via RS232 option Compares amp copies EPROMs OPERATION The JE664 EPROM Programmer emulates and programs various B bi word EPROMS from BK to 64K bit memory capacity The JE664 s RAMs may be accessed for emulatron purposes from Ihe panel s test socket to an external microprocessor OPTIONS FOR ProModem 1200 Data amp Address displayed in convenient hex formal Input 1 5VAC 60Hz tOW Size 15 L x BND x 3 HO Wt 53 los PM COM ProCom Communication Pins dl yver em 79 95 JE664 A EPROM Programmer Assembled amp Tested Includes JM 16A Module c see 795 00 Please specify Operating System IERER RODSOT INTER RACE COPTIC Rng ES SMS EE E os cea oat 5s DUET sins ERAT ERI F N Trej 5 RS232C Intertace m nts Computer ace ne JE 3 Thus a PM OP Options Processor nusse rererere 79 95 AE Shue erapos tre ar tara EAA tag on ne EA samp Wout D MADE be G N Conus Dor PMO 64K Options Processor Memory 64K gt o S 8 49 nei provided to adai tne sofware to cer computa wh an RS232 por 9600 Baud bt word oad panty and 2 stop bi PM ALP oinnes Display s 79 95 JE664 ARS EPROM Programmer w JE665 Option Assembied amp Tested includes JM16A Module 995 00 wn ne tc aE Se ae int Maa ae JE664 ARS CP JE664 ARS Communication Program 5 Disk 4 User s Instructions
207. ol in his work Despite its current un popularity the impedance bridge is probably the most versatile piece of test equipment you have to make re active inductive and capacitive measurements You have only to consider the range of uses for the impedance bridge to realize its value With the bridge you can quickly measure the impedance of an unknown capacitor cr inductor at a given frequency and then go on to find the resonant fre quency of a loudspeaker You can also measure the impedances of a transformer s windings and then cal culate its input output impedance ratio Analyzing a complex load such as presented by a distributed line or a multiple speaker PA system is a relative snap Actually the list of uses Can gO On and on Now that you know the value of the impedance bridge you can build one of your own All it takes is a re sistor and a switch plus a signal gen erator and an ac voltmeter Though the impedance bridge setup to be de scribed is utterly simple one exactly like it is regularly used by a well known hi fi equipment reviewer for his published test reports About the Circuit Shown in Fig 1 is the schematic dia gram of the impedance bridge Since it contains only a resistor R7 and a double pole double throw switch R1 FROM OSCILLATOR Fig 1 This is the schematic diagram of the impedance bridge Thistwo compon d OUTPUT we MEASUREM
208. on telephone jack P1 Telephone line cord S1 4 position DIP switch S2 Dpdt slide switch SPKR Miniature 2 8 ohm speaker Printed circuit board 9 volt dc 150 to 200 mA adapter IC sockets suitable enclosure spacers hookup wire sol der etc Note The following areavailable from Steve Lympany Clavier Electronics Inc P O Box 51281 Raleigh NC 27609 etched and drilled pc board for 6 95 AY 3 1350 for 5 50 preprogrammed 2732A EPROM for 7 50 RJ11 6 position telephone jack for 2 25 4N25 opto isolator for 1 50 each complete kit of parts includ ing speaker 9 volt adapter and enclosure for 43 00 Include 1 00 P amp H cessor so that the next time a ring sig nal comes in the tune will start at the beginning Resistor R prevents the ring signal and other minor surges from triggering the off hook circuit In the audio section of the Mello Phone envelope control is accom plished with U3 pin 13 When no tune is playing pin 13 remains low keep ing C5 discharged This allows R 9to pull the base of Q3 low keeping it off When a note is being played the note frequency appears at U3 pin 14 Pin 13 goes to a high impedance state and allows R7Oto charge C5to9 volts dc This turns on Q3 and places 9 volts dc on the emitter of Q3 Pin 14 toggles Q4 to produce the desired pitch at the speaker At the end of the note duration pin 14 continues to toggle at the previous note frequen cy Howev
209. ontroller system ize and enhance it For example in hi fi and video systems there are items you never want unpowered These include timers turntables videocassette recorders and the like Therefore you can incorporate into your Controller one or more ac re ceptacles that are unswitched Con nect these directly across the ac line where the line cord enters the Con troller box ahead of S see Fig 2A Another modification you might wish to make is the addition of a cir cuit breaker You can obtain push button reset circuit breakers in a wide variety of load ratings Deter mine what the maximum load would normally be for your system and se lect an appropriately rated breaker Install the breaker in theline between Fig 2 Options that can beadded toa basic controller system include series of unswitched receptacles A and circuit breaker protection B UNSWITCHED RECEPTACLES AS MANY AS NEEDED GRN NEUTRAL GRN LINE CIRCUIT BREAKER SEE TEXT WHT a TO FILTER INPUTS BLK the point where the ac line cord enters the Controller box and S Fig 2B Putting it Together The most difficult step in building this project is making the cutouts in which the receptacles mount on the rear panel These must be cut square and uniform in size and location De pending on the tools you have there are several ways to make these cut outs The easiest of course is with a chassis punch Second best
210. optional VHF converter Listen in on any mode upper and lower sideband CW AM wide or narrow and FM Store frequencies and operating modes into any of the twelve chan nels for instant recall of programmable scanning functions Plus you get keyboard frequency entry An LCD display for easy readout A SINPO signal graph Computer interface capability for advanced listening functions wo 24 hour clocks Recording functions And much more to make your listening station complete Listen in When you want more from your VHE UHF or HF receivers just look to Yaesu We take your listening seriously YAESU Yaesu Electronics Corporation 6851 Walthall Way Paramount CA 90723 213 633 4007 Yaesu Cincinnati Service Center 9070 Gold Park Drive Hamilton OH 45011 513 874 3100 lie py aa f E 7 Ln a a eal I v Prices and specifications subject to change without notice FRG 9600 SSB coverage 60 to 460 MHz
211. ort by RCA Americom RCA Astro Electronics RCA Laboratories and RCA Con sumer Products the massive under taking will begin with the launch of 12 24 GHz broadcast and syndica tion satellite K 2 aboard the new Space Shuttle Atlantis this Novem ber Then in December Space Shut tle Columbia will set into orbit cable and business satellite K 1 Both satel lites are scheduled to become opera tional by February 1986 A third sat ellite K 3 1s slated to fly in 1988 A preview of the new satellite sys tem was given to selected industry and technical press people at the David Sarnoff Research Center in Prince ton NJ earlier this year by staff vice president B J Lechner and others Announcements and demonstrations also included introduction of B NTSC an augmented video audio TV system designed to compete with Britain s B MAC now being market ed in the U S by Scientific Atlanta B NTSC is wholly compatible with current TV broadcasting and receiv ers for standard transmission and its signals can easily be scrambled and decoded by sets that could have exter nal or internal decoders available in 1986 Later as additional engineer ing is further refined and compacted into large scale integration LSJ cir cuits RCA digital television will join the parade of advanced video audio developments bringing even greater flexibility to televised picture and sound processing along with digital 28 MODERN ELECTRONICS Novem
212. osing receiving mode for choosing Local DX or Au tomatic reception of the preferred mode tuning mode automatic scanning or manual tuning audio Muting a push button for selecting the Automatic Class A Class AB mode and the dual concen tric Volume and Loudness rotary con trols The continuously variable loudness control a Yamaha feature introduced more than six years ago has a range of a full 40 dB as opposed to the 20 dB range on earlier versions In addition to the usual AM or FM fre quency digital displays and a ten segment signal quality display there are specif ic readouts for selected tuning mode cur rently selected receiving mode status of the preset keys whether the unshifted through 8 numbers or the shifted 9 through 16 numbers are applicable status of the Dynamic Noise Cancelling circuit and of the Simulated Stereo Cir cuit Small indicator lights are illiminated above whichever program selector button is activated Behind the hinged flap along the lower section of the R 9 front panel are a head phone jack three speaker selector push buttons a tone bypass switch bass tre ble and midrange rotary tone controls with detented center positions a balance control a DNC switch Dynamic Noise Control which acts very much like dy namic filtering of the more familiar sin gle ended DNR circuit a Simulated TE 12 MODERN ELECTRONICS November 198
213. ot many clandestines can be heard in English but thanks to a minority speaking that language in south ern Sudan Radio SPLA is one of them A broadcast believed to be via Ethiopia on November 1985 MODERN ELECTRONICS 75 lt _ rr lOO COMMUNICATIONS 9600 kHz at 1300 past 1330 has been heard by DX South Florida members Tahiti RFO Papeete is fairly easy to hear at night on 11825 and 15170 kHz but the 9 MHz channel nominally 9750 has been varying widely noted around 9687 9688 in the period before 0800 by Mitch Sams in Kansas and Ed LaCrosse in California Strangely enough Tan zania is also known to use frequencies around 9749 and 9684 at 0400 Uruguay Another September Octo ber registration with the ITU which may or may not pan out concerns new fre quencies from this country 10 kW on 9680 at 1100 2100 18860 at 2100 2400 and 9770 at 2300 0100 20 kW on11900at 1000 0100 via ADXN USA KCBI The National Radio of Texas began regular programming July 28 with a church service preached by Rev Criswell the station owner Other shows included DJs playing C amp W music mixed with devotional messages call ins for the same purpose news at 1800 and briefly at the start an hourly Radio Connec tion inviting DXers to phone in tips The schedule varied but was approx imately 1700 2000 on weekdays 1600 2100 on Sundays all on 17790 A week later contrary to previous rumors about
214. ou should know about are Credit vouchers or script are no substitutes for a refund the Rule does not cover you for using acredit card by telephone only without going through the mail merchandise cannot be substi tuted that s different from what you or dered without your authorization the seller s receipt of a properly completed order can be construed to mean the time at which he gets notice that a check or money order for the proper amount has been honored The Rule doesn t cover all mail order activities There are a few ex ceptions which include magazine sub scriptions and similar serial deliveries ex cepting the first shipment sales of seeds and growing plants C O D orders transactions covered by the FTC s Neg ative Option Rule such as book and record clubs and mail order photo fin ishing considered to be a service not merchandise Should you have a serious problem with any mail order house you can send your complaint to the Federal Trade Commission Enforcement Division Washington D C 20580 Fraud is another story of course Here you have recourse to the U S Attorney s Continued on page 82 b HH P J S om uu p X NEW uniden Beancot 7 eqency canners Communications Electronics the world s largest distributor of radio scanners introduces new scanners an
215. own in Fig 6 Figure 7 is a simple tone generator us ing a 555 timer chip configured as an astable oscillator Oscillation frequency is governed by the values of R7 R2 and C2 calculated as follows f approx 1 44 R1 2R2 CI With the values given in Fig 7 and when R is an Interlink FSR the tone generated ranges across the entire audio spectrum when the FSR is squeezed be tween thumb and forefinger Tone range can be easily altered by changing the value of CI Increase C s value to reduce the frequency range and vice versa Figure 8 is a straightforward compara tor circuit that permits a pressure sensi tive resistor to switch an LED on or off as the pressure on the resistor is varied Cir cuit switching threshold can be altered by changing the setting of R3 As shown the circuit switches the LED on when the pressure on R is increased If the input connections to the op amp at pins 2 and 3 are reversed the LED will switch off as the pressure on R is increased The circuit in Fig 8 can easily be modi Fig 7 A simple pressure sensitive tone generator built around a 555 timer PRESSURE SENSITIVE RESISTOR fied For instance the LED can be re placed by a small relay such as Radio Shack s No 275 004 if R5 is eliminated and the collector of Q7 is connected di rectly to the positive supply Computer Applications Computer graphics tablets such as the KoalaPadTM employ a surface coa
216. pages of photo graphs complement the text ME Siliconnections by Forrest M Mims III Published by McGraw Hill Book Com pany New York NY 240 pp hard cover 16 95 Expected publishing date November 1985 November 1985 MODERN ELECTRONICS 35 Project Mello Phone The Super Musical Telephone Ringer Build it yourself project substitutes up to 200 selectable musical tunes of extended length for a standard telephone ringer By Steve Lympany calming my nerves following a startling blast from my phone s bell ringer that there must be a pleas ant yet effective way of signalling an incoming telephone call Electronic music being one of my hobbies I de cided what I wanted was a telephone ringer that plays music and thus was born the Mello Phone While there are commercial prod ucts that substitute an electronic mu sic box for the normal telephonering er these are generally limited to justa few notes from a fixed set of tunes chosen by the manufacturer I want ed to select the tunes to suit my per sonal tastes and be able to listen to more than seven or eight notes for each tune as with the Mello Phone The Mello Phone can play up to 200 different selections of varying lengths of up to 252 notes and rests use selections such as college fight songs seasonal tunes anda few Mo zart and Beethoven pieces The choices of course are unlimited The Mello Phone installs between
217. pay channels your cable system has to offer This is not a kit Price 125 00 Send 2 00 for in formation and order form to ADVANCED TECHNOLOGY SYSTEMS Box 316 Au burn MA 01501 607 832 2339 FREE PAY TV RECEPTION How To Book 5 00 DIPTRONICS Box 80 M2 Lake Hiawatha NJ 07034 SUPER powered notch filters Equivalent of cable company cylinders Eliminate unde sirable signals Any channel 2 through 8 14 A through 22 1 Please specify Send 20 00 each Money back guarantee Quantity discounts CATV Box 17621 Plantation FL 33318 COMMUNICATIONS COMMUNICATIONS plans kits books 1750 Meter transceivers AM FM broadcast transmitters ham CB amplifiers surveillance bugs much more Catalog 1 00 PANCOM Box 130 ME10 Paradise CA 95969 CABLE Converters Radar Detectors Police Scanners Send 1 00 for catalog G L C I 1717 4 Mile Rd NE Grand Rapids Mi 49505 FREE CB MODIFICATIONS catalog Fre quencies sliders FM amplifiers books kits repairs high performance accessories CBCI Box 31500ME Phoenix AZ 85046 602 996 8700 meee SUBSCRIBE NOW Bo j gt Learn the secrets of your computer PUT BIG MONEY IN YOUR BAN A A unique Y 1 periodical TM gt o thet dares to tani cort s100 Nos utel 5L e PUBLISHED MONTHLY c roils ONE YEAR SUBSCRIPTION 14 00 X won t CANADIAN 18 00 FOREIGN 24 00 SUBSCRIPTION
218. prices Since 1970 Send for the last 3 issues Star Tronics Box 683 McMinnville i ORD Caia Cosmiserelal Rates ASTEAREN 15 word minimum 13 50 Sama Word ZANR count includes name and address ZIP code and abbreviation each count as one word P O Box number and telephone number count as two words each Indicate free category heading A special heading is available for a 6 surcharge First word only is set boldface caps at no charge Add 20 for additional boldface words i Mart Display Rates 1 x 1 col 120 2 1 col 230 3 x 1 col 330 Prepayment dis iro KO 36117 Hillcrest Eastlake Ohto count 5 for 6 issues 10 for 12 issues prepaid at once REA ecce tria dile Ses x All advertisers with PO Box addresses must supply permanent address and telephone number Copy is subject to publisher approval Mailing Information Copy must be received by the publisher by the 20th of the third month preceding the cover date Send Advertising material with check or money order to Modern Electronics Classified Department 76 North Broadway Hicksville NY 11801 DIGITAL KLOCK KIT plays 1 of 12 melo dies each quater hour Displays time date and other features Send 2 25 for complete assembly plans and pricing to KERBER FIDEO CABLE TY CONVERTERS Why pay an outrageous monthly fee All Jerrold Products COMPUTERS 25 PROGRAMS for your Apple Hun dreds to choose from Educational business sc
219. purious signals these units presume that a driver should be made aware of a suspect signal even if the detector is not con vinced it is being generated by police radar As an example Controlonics among others has built a new filter mode into its detectors that can be switched on when driving into an ur ban area Instead of reducing the sen sitivity of the radar detector and thereby affecting optimum ability to monitor for police radar the unit Continued on page 83 t MANUFACTURERS Fox Marketing 4518 Taylorsville Rd Dayton OH 45424 Brand Names Roadstar Matchbox SuperFox GUL Industries 23978 Craftsman Rd Calabasas CA 91302 K40 Electronics 1500 Executive Dr Elgin IL 60120 Radio Shack 300 One Tandy Center Fort Worth TX 76102 Brand Name Road Patrol Regency Electronics Inc 7707 Records St Indianapolis IN 46226 Uniden Corp of America 6345 Castleway Ct Indianapolis IN 46250 Brand Name Bandit November 1985 MODERN ELECTRONICS 27 Satellite TV RCA Goes Ku Band New satellites to serve TV broadcasting business and home TVRO viewers By Stan Prentiss ith all systems go RCA is ready to rocket two satel lites into Ku band orbit late this year and expects both to be come operational in early 1986 Ground support will consist of excel lent ColorTrak 2000 TV receivers with compatible NTSC transmission systems and Linkabit scrambling In a consolidated eff
220. r 5MHzj 900 27032430 4005 8 ao0ns AM CMOS 2295 akcse M 75 74HC194 16 119 T4HC4049 16 89 74 890 55 74 S19 18 89 74 541 20 149 8087 2 40 Arihmetic Processor 8MHz 12500 2764 20 8 8192x8 200ns 21 695 7aHCio7 14 79 74HC195 18 139 7AHC4050 1b 89 7ASQ M 55 74 192 1 79 7415640 29 219 8080 4p CPU 816 81 1495 275425 28 BID 29009 21V 509 f 74HC109 16 79 74uC20 16 295 74HC4060 16 149 7AS939 M 59 7A S193 15 89 7415641 20 219 8116 1B Duat Baud Rate Generator 949 2764425 28 8192x8 250ns 12 5V 5 95 74HC112 16 39 7440237 16 149 74HCA075 M 59 74 896 15 89 7TALS194 16 69 74 5644 20 2 19 8155 40 HMOS RAM 1 0 Port Timer 495 2764 45 28 8192x8 rn 21V 4 95 74HC123 16 229 74HC240 20 229 74HC4078 14 59 TAS 39 74Si5 1 59 7aLS645 m 2 9 856 40 RAM wath VO Pori and Timer 595 27c64 28 81988 CMOS 21V MSS muc5 4 0075 anco 20 0229 740109 185 74ES 112 16 45 7415197 4 89 745688 20 295 8203 4 64K Dynamic RAM Controller 29 95 271 284 25 8 16384xB 250ns 128K 12 5V 7 95 7446137 18 159 7446243 M 215 74HC4538 B 259 74 5122 4 4 27256 25 8 32 58x8 250ns 256K 14V 1135 i 49 7418221 16 109 als9s 20 149 820 16 Hi Speed 1 out of 8 Binary Decoder 395 asez 74 8192x8 450n51 25V 128 74HC138 t6 6019 74HC244 00 228 7AHC4A543 16 375 745123 l6 79 7ALS240 0 109 BILS9 20 149 8212 amp 4 8 Bit Input Output 745412 225 68765 P B192 8 roe rd 14
221. r calendar and communications software and I liked the Zenith s keyboard But a laptop with only 32K RAM a 16 x 80 screen albeit with fat LCD characters like Hewlett Packard s and no current provision for mass storage except a cassette port at a list price of 1 995 The Heath catalog s 1 195 introductory offer seems more re alistic in this light Refurbished Antique As I said in my review of Newword Mod ern Electronics July 1985 p 75 the ven erable WordStar has many shortcomings But if you ve got the 16 bit version of Mi croPro s Cro Magnon word processor there are several reasons to spend 19 95 plus 2 shipping and handling and get UnderGround WordStar a collection of tips and patches from Hard Soft Press of Riverdale NY Half the value of UnderGround s price lies in its helpful witty manual which supplies 78 pages of undocumented com mands and documented shortcuts even Ctrl KS Ctrl QP veterans may have for gotten it sent me back to the manual to learn that yes Ctrl KP lets you work on one file while printing another There s also a disk of utilities ranging from MailMerge templates to batch files for those who use Word Star with RAM disks they safely copy documents to a Kaypro s 2000 laptop computer is a low real disk One BASICA program serves as a menu driven alternative to DOS De bug helping even novices implement the WS COM patches described in the Un derGround manual whether
222. r warning does occur in the city there is no way you can really determine if it has been triggered by police radar or aspurious signal The best bet here is to simply slow down to prevent even the possibility of get ting a ticket Detector Designs The first radar detectors introduced on the market were typically bulky and designed to reside on a vehicle s dashboard via either a heavy magnet or a solid mount After a time tech nical innovations resulted in lighter more compact units that could also be installed with clips or Velcro tape Smallish units are now available that can be clipped to a sun visor and November 1985 MODERN ELECTRONICS 25 Iu o roo eo Deciding which radar detector to buy 1s probably more challenging than pur chasing most other popular electronic equipment Unfortunately there are no real standards upon which to weigh one product against another No specifica tions for comparison purposes The keys to making a buying decision _ might be broken down into the follow ing price one piece or remote size features company reputation plus any information you can gather from retail sales people and radar detector users You can pick up a basic radar de tector for as little as 60 but don t ex pect it to have the best sensitivity or se lectivity not to mention anti false trig gering circuits city highway switching and other attractive features The top detectors are pushing 300
223. rator or an Amateur operator looking for that rare country the information in this book will tell you what you need to know So that you can take the fullest advantage of your communications facilities The all new 2nd edition of The Shortwave Propagation Handbook is only 8 95 postpaid sent by Book Rate Mail allow time for delivery Order now Se ee eee eee ee ee ee Be Be eB eee SE Ee ee Se eee IPLE MODERN ELECTRONICS 76 North Broadway Hicksville NY 11801 Please rush me my copy of the 2nd Edition of The Shortwave Propagation Handbook 1 8 95 for the book plus 2 for shipping amp handling Name Address City OU Mastercard VISA November 1985 MODERN ELECTRONICS 83 EU Impedance Bridge R1 in the circuit and the line to the D U T closed At this point you should have nothing connected to the D U T cable Set the voltmeter s range selector for making measure ments in the low millivolt range 5 Connect the component to be tested to the D U T speaker cable and read theimpedance directly from the meter s display The system is very simple to set up and use You can make impedance measurements at any frequency with in the oscillator s or meter s range from page 52 phase angle a parameter associated with the reactance of the component being tested As you may recall volt age leads current in an inductor while voltage lags current in a capaci tor Toread phase
224. rcuit via the 9 volt adapter Touching the positive test probe of the meter to TP1 should yield a reading of 9 volts and touching it to TP2 should yield a reading of 5 volts If you don t obtain a proper read ing check to make sure that the 9 volt adapter is indeed delivering 9 volts dc when not connected to the Mello Phone If it is check the wir ing of VR to make sure you haven t reversed the lead order during instal lation Correct any wiring error and or replace any defective components before proceeding Once you obtain the proper read ings at TP and TP2 disconnect power from the Mello Phone and in stall the ICs in their respective sock ets making absolutely certain to properly index them Also since syn Fig 4 Shownat the top is the actual size etching and drilling guide to use if you fabricate your own printed circuit board Underneath is the componen ts place ment orientation diagram to use when wiring the circuit board thesizer U3 and EPROM U4 are sen sitive to damage from static electrici ty use safe handling procedures dur ing installation Power up the Mello Phone once again and momentarily short TP4 to ground to cause a tune to start play ing through the speaker After a few notes have sounded momentarily short TP3 to ground to stop the tune If you obtain these results the Mello Phone is ready to be installed Just plug your telephone into the jack on the pc board and plug
225. re included Fig 8 A simple pressure controlled com parator built around a 741 op amp G TO t S v R1 3 7 R3 2 R2 LooK 4 look 2 60 MODERN ELECTRONICS November 1985 eS LK RY ik QOL 22222 Ce D gt Ri PRESSURE SENSINVE RESISTOR RY A3 c mio S1 gw Ww SWITCH a s2 cex SWITCH 2 EnDdICA2 8 JOYSTICK CONNECTOR SEE iPear REFERENCE TECHNICAL MANUAL Fig 9 PCjr joystick circuitry and con nector plug schematic diagrams Figure 9 also shows the pin connections of one of PCjr s joystick connectors Leads from a PSR can be connected di rectly to the joystick of the PC7r easily done with a Wire Wrap tool Alternative ly one or two miniature phone jacks can be added to a joystick to permit the re sistors to be connected to the joystick it self I used the latter approach since the Berg type connectors used in the PCjr are hard to find In either case it s importarit to know that noise coupled into the joystick ports can cause erratic operation That s why the joystick cables are shielded For this reason keep the leads to the pressure sen sitive resistor short or use two conductor shielded cable and ground the shield This PCjr program will display the joy stick value of a single pressure sensitive resistor connected to the x axis potentio meter 10 CLS 20 X STICK 0 30 LOCATE 10 20 40 PRINT X 50 GOTO
226. re worth over 1000 at retail and more 100 Page Free Catalog Tells More Send the postage paid reply card today for NRI s big 100 page color catalog on NRI s electronics training which gives you all the facts about NRI courses in Micro computers Robotics Data Communications TV Video Audio Servicing and other growing high tech career fields If the reply card is miss ing write to the address below AM SCHOOLS McGraw Hill Continuing ue c HL Education Center 3939 Wisconsin Avenue NW Washington DC 20016 We ll Give You Tomorrow PRODUCT EVALUATIONS Yamaha R 9 continued The stereo synthesizer circuit like many others of its type utilizes a comb filter circuit to convert a monophonic sig nal into a simulated stereo signal Of course the resulting effect is not true stereo but the spread of sound is pleas ing nevertheless The DNC or Dynamic Noise Canceler circuit worked in a manner very similar to that of the DNR Dynamic Noise Reduc tion circuit which is sold in the form of an C and used by many car stereo manu facturers as well as by tape deck and videodisc player manufacturers among from page 15 others DNC is a sliding low pass filter that follows the upper frequency limit of program content and removes noise above the frequency The three tone controls provided just about all of the tonal compensation facil ities anyone would ever need For tho
227. red remote control head that can be mounted inconspicuously inside the car Popularity of remote type radar detectors grows as more people realize that some states and towns do not recognize the legality of using one and theft of radar detectors has risen sharply along with car radio cassette systems Packing this sophisticated elec 26 MODERN ELECTRONICS November 1985 X band and K band signal being picked up Radar detectors respond to different radar signals in various ways Whichever model you get you ll have to familiarize yourself with its warnings One model might start beeping slowly increasing as you approach the signal source beep for several seconds and stop under another condition emit raspy sounds for a few seconds in yet another condition etc How well does the detector respond on each band under different practical con ditions Over the hill Smokey at your back or front door around a curve in a large urban area and so on Further more how good is the detector s shield ing against local oscillator radiation from other detectors being carried in nearby cars You ll have to ask a lot of questions to possibly learn the answers Keep in mind too that radar detectors are not foolproof For example an in stant on radar fired at you closeby will catch you even though your detector re sponds You won t have time to slow down in this case Furthermore VASCAR visual average speed com put
228. ring only 1 42 x 0 98 x 0 18 and weighing 1 oz it has a recording capacity of a full 60 minutes of dictation and other voice applications It s being used in the company s newest protable recorder Model 4250 Exec CHRYSLER USES BAR CODES Chrysler Corp changes electronics component suppliers business ways by now requiring them to label automotive parts containers with bar coded information Other auto makers will follow all using CODE 39 the bar code chosen by the Automotive Industry Action Group as a standard in the industry JUSTICE DEPT SLAMS RF INTERFERENCE VIOLATORS The U S Dept of Justice recently announced actions against people who unlawfully operated radio broadcast equipment It s suing one person for 900 in accumulated fines for refusing to allow his Citizens Band Radio equipment to be inspected as a result of many complaints from neighbors about TV interference Inspectors claim that the user was exceeding the maximum power level In a similar case where 40 complaints were registered an FCC engineer determined that the culprit was putting out 47 watts which is 43 past the maximum allowed Suit was filed for 750 A third case charged a company with interfering with TV reception for 18 months due to computer generated signals Accumulated fines for failing to shield the computer to eliminate interference were 3 000 CONSUMER ELECTRONIC PRODUCT PRICES DROP Notwithstanding typical in flationary increases in jus
229. ripherals from one central location By Paul M Spannbauer A Solid State Light Dissolver Smoothly dim or brighten lights automatically with flip of a switch By Imre Gorgenyi A Simple Impedance Bridge Two component project lets you measure im pedance determine resonant frequency etc By William R Hoffman Army Wrist Receiver Helps soldiers locate assembly points Absolute Reset for Newest Apple IIs Update info you need to use the Apple He Absolute Reset with the new enhanced He and IIc By Don Lancaster PRODUCT EVALUATIONS Yamaha R 9 Do it all Audio Video Receiver By Len Feldman Global Specialities Model 8001 Scope Multiplexer Gives 8 inputs to 2 channel scopes By Stan Prentiss DEPARTMENTS Editorial Buying By Mail Bv Art Salsberg Letters Modern Electronics News New Products Electronics Notebook Pressure Sensitive Resistors By Forrest M Mims IIl Hardware Hacker Bar codes fiber optics goodies isometric drawings and more By Don Lancaster PC Papers Digital Research s GEM software and Kaypro 2000 laptop computer By Eric Grevstad Software Focus Health and Fitness Programs By Charles M Salsberg Communications International SW Program Updates By Glenn Hauser Books amp Literature Advertisers Index 2 MODERN ELECTRONICS November 1985 EDITORIAL STAFF Art Saisberg Editor in Chief Alexander W Burawa Managing Editor Dorothy Kehrwieder Production Manager El
230. roducts just begging to be serviced ME Stan Prentiss CIRCLE 54 ON FREE INFORMATION CARD Radar Detectors from page 27 BEL Tronics ultra slim Micro Eye Selectra 841 simply produces a low frequency sound and flashes an amber light This continues until the driver leaves the field of energy causing the warn ing or until the unit detects true speed radar signals in which case the louder audio warning will sound and the red warning light flash Detecting a Bright Future It can be confidently assumed that police departments will continue to utilize speed radar because it pro vides an effective way for traffic pa trolmen to write a constant barrage of tickets that are difficult to dispute in court It is equally clear that state and local governments will continue to support this because substantial revenue is involved So If we can count on speed radar traps as an integral part of life as we know it we can also count on the continued existence of radar detec tors They are obviously the best in Surance one can have against the speed radar ticket as well as heightening driver awareness of his speed The radar detector industry as a whole grew some 50 percent in 1984 and some 15 to 20 percent growth is expected for the next couple of years It s now a 200 million per year business with about 2 million units zm sold It should be interesting to note just what the coming year
231. rst reported by members of Play DX in Italy Mexico Even Radio Mexico Interna tional uses only 10 kW but now several 100 k W frequencies have been registered perhaps in anticipation of activating the high power unit it has had for many years or could it be some other station At 1200 2000 and 2300 0300 check 6035 9575 11720 1200 9000 9750 24 hours on 6110 and 15110 via ADXN Norway The initial fall schedule for Sunday English to North America from Radio Norway 1300 1400 1700 on 15305 1600 on 15305 11850 1900 on 11850 0400 Monday on 6015 via Joe Hanlon Eric Swedberg Pacific Aviatrix Amelia Earhart my steriously disappeared new Howland Is land in 1937 For those who suspect she somehow survived this information un earthed by Loren Cox from the April 1935 issue of Short Wave Craft should be of interest Her Western Electric short wave radio never failed night fre quency was 3105 day 6210 callsign KHABQ A nest of storage batteries powered the unit and a close contact microphone eliminated cockpit noise Philippines The new 100 kW trans mitters for the Maharlika Broadcasting System external service from Malolos are registered on the following frequencies on a schedule too lenghty to give here 6090 6160 7190 7250 9560 9565 9605 9690 9740 11725 11790 11800 11915 11925 11965 15170 15195 15225 15270 15280 15360 15370 15400 17705 17725 17775 Again we suspect
232. s 2 half ht 5 floppy drives vertical 2 79 95 HDDE 1FH Houses harddrive 2 2 E 219 95 General Application Keyboards Mitsumi 54 Key Unencoded All Purpose Keyboard SPST keyswitches 20 pin ribbon cable connection Low profile keys Features cursor controls control caps lock function enter and shift keys Color key caps grey Weight 1 Ib Pinout incl Size 13 L x 44 W x 34 H ASCII Cherry Keyboard 7 bit parallel ASCII Full Upper Case Full Lower Case exceptl m n o and p Cursor keypad SPST mechani cal keyswitches 26 pin header connector Color white Size 18 L x 6 4 W x 1 H Spec included KB8201 1700 available UV EPROM ERASER 1 Chip 15 Minutes Erases all EPROMS Erases upto 8 chips within 21 minutes 1 chip in 15 minutes Maintains Constant exposure distance of one inch Speciai conductive foam liner eliminates static build up Built in safety tock to prevent UV exposure Compact only 9 00 L x 3 70 W x 2 60 H Complete with hoiding tray for B chips DE 4 UV EPROM Eraser 74 95 UVS 11EL Replacement Bulb 16 95 b ameco Mail Order Electronics Worldwide Since 1974 jJameco 12 MILLION PC IC CLEAR CAFE FOR GRAT NOORT RED HOT RAM amp EPROM PRICES NEW EEPROM Part Na Pins Price PartNo Pins Price PartNo P
233. s Shopper s Paradise was well done and certainly intriguing at this side of the pond It certainly appeared that the electronics buyer can find some remarkable products at very low prices to bring back to the USA However when it comes to amateur ra dio equipment U S amateur radio com panies like Kenwood and Yaesu are dead set against their imported equipment coming back to the States by hams trying to saveabuck Some of their equipment is listed on a Customs blacklist that disal lows its entry into the States A student of mine recently had to send his new Ken wood 940 transceiver back on the same charter flight he brought it in on because Customs would not permit its import There are also many subtle frequency and power differences between Japanese and United States destined equipment One student save 100 on his handie Continued on page 91 II EDITORIAL EN Buying By Mail Many billions of dollars are spent each year in mail order purchases In the elec tronics and computer fields this mode of doing business has grown enormously for a variety of reasons Firstly no single store could ever stock the vast variety of parts and equipment on the market to day Furthermore selling prices by mail order companies are generally well below those of local stores for the same product There are tradeoffs of course For ex ample many electronic mail order com panies have minimum orders of say 10 whereas local
234. s easier and has the advantage of providing you with an essentially no cost ac line cord Disassemble the box in which the project is to be housed and tem porarily set aside the top panel Ma chine the box as follows First drill three or four 4 holes through the long wall at the lower right corner andtwo more holes through the short wall adjacent to where the first set of holes are drilled Theseserveasa vent for heat in the area occupied by triac Q4 when the project is assembled Drill the hole for the line cord through thelong wall opposite that in which the vent holes are drilled If you use the latter type of receptacle discussed above drill a second hole in this wall to permit its cord to enter the box and connect to the board Off the board components R4 S1 and S2 mount on what was originally intended as the bottom of the box Drill the mounting holes for these components locating them where there will be no interference with the components on the pc board If you have decided to use a chassis mount ac receptacle machine a slot in which it will mount on the blank short wall Mount the components in their vari ous locations and place a control knob on R4 s shaft Turn over the box and place the pc board assembly alongside it and re ferring back to Fig 1 connect and solder the free ends of the hookup wires to the appropriate lugs on R4 1 and S2 If you are using the chassis mount ac receptacle clip 6
235. s will bring in the form of detection hardware and electronic innovation as the Radar War continues nk iens as S A Solid State Light Dissolver from page 47 length of line cord Pass this cord through its entry hole in the box and tie a knot in it about 6 from the pre pared end Solder the conductors to the LINE CORD pads If you have decided to use the ex tension cord instead of the chassis mount ac receptacle cut it apart about 12 from the socket end and prepare all conductors at the cut ends Pass the free ends of both pieces through their respective holes in the box and tie a knot about 6 from the prepared ends of both Con nect and solder the conductors to the appropriate SO and LINE CORD pads on the pc board Retrieve the lid of the box and de termine where to drill the mounting hole for the pc board Drill this hole and then mount the board in place us ing a 4 spacer and 6 32 x ma chine hardware Bend a 4 x 2 strip of Vs thick aluminum into an L shape locating the bend 1 2 from one end of the strip Drill a 4 hole centered and X in from the ends of each leg Spread some heat transfer silicone paste over the metal face of Q4 and mount the L bracket heatsink to the triac use the long leg of the bracket with machine hardware Loosely mount a 1 by 2 L bracket on the other end of the heat sink facing its free leg in toward the pc board Mark the mounting hole o
236. se who feel that a narrower band multi control equalizer is needed the Yamaha R 9 even has an accessory output loop to which an equalizer or other signal pro cessor can be connected effectively put ting the new accessory in series with the signals passing through the receiver Test Equipment The R 9 is without a doubt one of the most flexible and well thought out multi function audio components we have en countered Foresighted audio and video enthusiasts may find that they may not use all of the extensive facilities of the R 9 at first As they become more involved in audio and video in the future it is very likely that more and more of those rear panel jacks will be filled up with audio and video connectors Len Feldman CIRCLE 52 ON FREE INFORMATION CARD Global Specialities Scope Multiplexer 8 inputs for 2 channel scopes Working on much of the current array of electronic products and systems can tax the capabilities of most general purpose 2 channel oscilliscopes Products such as computers in the digital area and video and audio equipment in the analog area require simultaneous display of multiple waveforms Using a scope with just two input channels can be a serious handicap when servicing them On the other hand a scope with four or eight input channels may be well beyond some budgets How ever if you already have a 2 channel scope with at least a 20 MHz bandwidth Global Specialties Model 8001 Scop
237. se pc board from the source given in the Parts List In either case use the components placement diagram in Fig 4 to guide you in component installation When mounting components on the board make sure you properly orient the di odes and electrolytic capacitors be Continued on page 88 b i B A November 1985 MODERN ELECTRONICS 41 Project A Computer System Power Controller with Surge Spike Protection Lets you individually turn on off your computer and peripherals from one central location By Paul M Spannbauer re you tired of reaching around to the back of your a computer the side of your printer and the back of your modem to turn each on or off Or wonder if you should add more surge and spike protection devices You can over come these irritants by buying a bunch of commercially available de vices of course but at considerable cost My solution to this problem was to build my own ac line power con troller with built in surge spike sup pressors Cost was about 62 includ ing a fancy cabinet for the project Everything fits inside a handsome shielded metal box The ac outlets in to which the system equipment plug are located on the rear panel while all switches and their status indica tors mount on the front panel If you examine the photos you can see that my Controller was designed to have four outlet switch indicator com binations to suit the needs of my computer sys
238. sed Instead an alike but dif ferent somehow patch should be used This patch goes in a differen location is slightly longer and has a different checksum To build an Absolute Reset for the new Ile 1 Use SNATCHMON te grab the new Ile monitor image 2 BLOAD IIEMON C A 8000 13 CALL 15 4 82C8 EE F4 03 AO IC A9 C5 20 A8 FC 2C 61 C9 10 OB 88 DO F3 4C 59 FF CO CO 00 00 00 5 BSAVE KREBFMON C NEW IHE AS8000 L 1000 6 Burn the new CD EPROM Use KREBFMON C NEW IIE for the low 32K and ITEMON D for the high 32K If your burner can handie a whole 2764 at one time combine and move your files downward toa suitable buffer space in memory For instance do a BLOAD KREBFMON C NEW IIE A 2000 and then a BLOAD IHIEMON D A 3000 This gives vou an 8K buffer starting at 2000 Note that you will plow DOS if vou try using an 8K buffer that starts at 8000 Note also that the self test on the new Ile behaves differenily than the old Expect some page two garbage and an occasional flash followed by a System OK message atter a minute Nosti Apple II The simplest way to han dlethisis to dig up an oid integer card and use it These old monitor chips have been advertised from time to time in computer magazines Alternatively you can do a 2716 EPROM substitution here provided you add an inverter to handle the re versed sense of the 2316 ROMs ini tially used Skip this detai
239. see me 49 95 Incl Options Processor aes CABLE Cable for IBM PC to JE664 ARS Programmer 5 Siwelded Capie amp Connectors is 29 95 H 64K Memory and R MODULES rne 4684 5 Jumper Module Personality Module a plug in Module thal Pri gels the JE664 for prope pro PM Special Alphanumeric Display s s 1 49 95 gramming Te to tha EPROM and conligures the EPROM socket connectons for Inat parbcular EPROM M JES64 EPROM Programming _JUMPER MODULE NO EPROM Hage EPROM MANUFACTURER PRICE JMOBA 2708 25v AMD Votorola National iniel TI 1455 JM16A 2716 TMS2516 Ti 25V intel Motorola National NEC TI AMD Hrach Mostek 1495 JM32A 1982537 25V Motoroia Ti Hitacnr OK 495 M38 2732 25V AMG Fujitsu NEC FMiactn Intel Mrtsubial Nationa 1495 MC 27324 21V Fapisu intel 1495 JM64A MCMB8764 MCMSGL764 MCM5B766 25v Motorola 14 98 JM6 amp 4B O 204 21V intel Faircheld OKI 1495 MGC TMS2564 25N 7 1495 HAEE 1 imei Abe etc 1495 Jameco s New 1986 Catalog Complete Line 965 pages odii code hber dre P ll Filled with New Products Reduced Pricing 210830 Intel Memory Components Hndbk 1983 84 14 95 and Valuable Pin out Data Contains all Applications Notes Article Reprints Data Sheets amp other Suttle Memories 860 pages e S OMS Feo METTE E 1 ele elms tol TT RTL Tor 230843 Inte Microsystem Components Hnd
240. senal ex panded to include low power in stant on pulse and radar hand gun units Radar speed enforcement was here to stay While there is certainly some merit totheuse of speed radar it has unfor tunately gained a rather soiled repu tation because it has been abused What was initially introduced as an innovative and futuristic method of enforcing traffic speed limits became the high tech answer to methodically building city coffers Countless police agencies foregoed placing their radar equipped patrol cars in plain view where their high profile would graphically alert mo torists that they should maintain a le gal speed Instead the police units often hide by stationing them selves between parked cars just over thecrest of a hill and around corners where they could surprise their four wheeled prey and be guaranteed of writing an iron clad ticket Thus speed traps became a popular road game But many motorists grew weary of losing and decided to become active players in this game Concurrently several innovative companies devised products that they believed would aid the harried motorist in his quest to Cobra RD 41000 Dynascan s Trapshooter drive ticket free without fear of be ing nailed by major league electron ics This new and exciting product became known as the radar detec tor of course An Exciting Defensive Weapon With theintroductionof the radar de tector
241. ss the two terminals Figure 4 is a logarithmic plot of the re sistance of an Interlink Electronics pres 1oK T qo Np pu LOG LOAD CGRAMS Fig 4 This is the log log plot of resis tance versus force for the Interlink FSR RM LINEAR RaNGE 8 LOAD KILOGRAMS Fig 5 High load value resistance plot for the FSR example in Fig 4 sure sensitive resistor versus an applied force When the load applied to the FSR ranges from about 5 to 12 kilograms per square centimeter the straight line log log relationship plotted in Fig 4 becomes the simple linear relationship shown in Fig 5 Note how at least over this range the change in resistance with respect to the applied load is very small Incidentally both Figs 4 and 5 are adapted from Force Sensing Resistors an application note published by Inter link Electronics Among the applications for FSRs listed in this note are point con tact graphic tablets for computers theft detectors robot grip sensors musical kevboards musical drum pads and theft detectors Application Circuits It s quite easy to demonstrate operation of a pressure sensitive resistor with the Mr M a d H M M November 1985 MODERN ELECTRONICS 59 ELECTRONICS NOTEBOOK help of asimple circuit Both circuits that follow use the symbol suggested by In terlink Electronics the pressure sensitive resistor sh
242. stered Trademark of Intemational Business Machine Corporation Epson is a Registered Trademark of Epson America Inc Apple and the Apple logo are Registered Trademarks of Apple Computer Inc Compaq is a Registered Trademark of COMPAQ Computer Corporation 1984 AT amp T Technologies Inc Your Own IBM Compatible Computer Learn the Basics the NRI Way and Earn Good Money Troubleshooting Any Brand of Computer The biggest growth in jobs between now and 1995 according to Department of Labor estimates will occur in the computer service and repair business where demand for trained tech nicians will actually double You can cash in on this opportunity either as a full time corporate technician or an independent service person once you ve learned all the basics of computers the NRI way NRI s practical combination of reason why theory and hands on building skills starts you with the fundamentals of electronics then guides you through advanced electronic circuitry and on into computer electronics You also learn to program in BASIC and machine language the essential languages for troubleshooting and repair You Build and Keep a 16 bit Sanyo personal computer The vital core of your training is the step by step building of the 16 bit Sanyo MBC 550 series computer Once you ve mastered the details of this state of the art machine you ll be qualified to service and repair virtually every major brand
243. stores don t Also you pay modest shipping and handling charges when you order by mail Nonetheless low prices and parts equipment availa bility usually make up for these short comings if you want more than just one or two resistors The slight delay in getting products bought is a small cross to bear for most people But what do you do if there isan unrea sonable delay in receiving your order for which you ve paid up front And what do you do should there be a rotten apple in the barrel Unlike a local store you can t confront someone who might be a thou sand miles away Moreover a state s laws can t protect you when dealing with someone in another state Should you ever be faced with such problems you should know that you do indeed have special protection in mail order transactions The Federal Trade Commission has a Trade Regulation Rule relating to mail order merchandise as an example The civil penalty for violating the Rule is up to 10 000 per violation each day of failure to comply with the Rule may be treated as a separate viola tion In addition the FTC can also sue for consumer redress Let sexamine the Rule now which was set up to protect consumers who buy by mail and to build up trust and confidence in mail order transactions Shipment of a properly completed order must be made within 30 days after its receipt unless shipment time is clearly and conspicuously noted in a solicitation e g Allow 5 we
244. t Cl R10 C2 Ril C3 MTI lt add for i lt tast off 1004 F 56K 1p F 200 IUE PARTS LIST Semiconductors Resistors 2 or 4 watt 10 dio Shack No 273 102 or similar D1 1N4001 rectifier diode IC1 MOC3010triac driver Motorola Q1 MPS3904 or MPS6514 npn transi tor Motorola Q2 MPS3906 or MPS6516 pnp transi tor Motorola Q3 2N4871 unijunction transistor Q4 2N6071B 200 volt 4 ampere or MAC222 4 Motorola triac RECTI MDA 920 4 bridge rectifier Motorola Capacitors C1 100 pF 25 volt electrolytic C2 90 1 guF 50 volt disc C3 C4 0 I 4F 200 volt disc Fig 1 This is the overall schematic diagram of the Light Dissolver Note that the common lines for the ac line and periods is best In operation have the fade in projector start its action about midway through the fade out projector s period This will mo mentarily superimpose the frame from the two projectors on the screen and eliminate the annoying blackout on the screen between slide changes e f you have only one slide pro jector you can still spice up your presentations with a Light Dissolver Just have the Dissolver control a 150 watt lamp directed at the screen to cast a colored light between slides When you advance the projector si multaneously push the instant on button on the Dissolver Usethe Dis R1 2 2 megohms R2 R9 220 000 ohms R3 150 000 ohms R7 10 000 ohms R8 1000 ohms R10 56 000 ohms R11
245. t Kaypro 2000 laptop computer By Eric Grevstad _ This month s products have the kind of symmetry that writers of introductory paragraphs dream about some of the newest PC software and some of the old est The new item is GEM Desktop Digi tal Research s Macintosh style graphics interface for MS DOS micros The other is everyone s favorite old dog WordStar taught a few new tricks by a 20 accessory package In between I ll look at the Kaypro 2000 the PC compatible laptop the Data General One should have been or at least one that costs what the DG One should have cost The Blue Apple Noone will call GEM Desktop innovative or original but anyone who thought the 1981 vintage PC was dead or that Digital Research Inc creator of CP M was dead must admit it s a pleasant package With one exception DRI has done a re markable job of emulating Apple s Mac intosh user interface translating it to PCs and compatibles Considering the aging 8088 CPU Desktop reminds me of those sleek fiberglass sports car bodies avail able for VW Beetle chassis but more on that in a moment Even on my bare minimum graphics system a Tandy 1200 HD with graphics card and monochrome monitor DRI s Graphics Environment Manager turns the screen into a near clone of the Mac s floppy and hard disk icons and a trash can for deletions disk directories in win dows showing folders subdirectories papers files and cute sy
246. t about everything prices of consumer elec tronic equipment prices continue to decrease Compact Disc players for example dipped from an average dollar value of 429 in 1983 to aisout 280 in 1985 tabletop VCRs from 470 in 1983 to 375 in 1985 c lor TV receivers from 386 in 1980 to 530 in 1985 programmabl video games from 116 in 1982 to 43 in 1985 home computers from 650 in 1982 to 500 in 1985 telephones corded from 54 in 1982 to 31 in 1985 UNIVERSITY COMPUTERS Hewlett Packard has developed programs on arti ficial intelligence AI at U S universities to foster basic research in this important computer area It expects to grant about 600 work Stations to 12 to 15 universities with each receiving a license for prototype AI software developed by HP Labs It has already announced grant awards to Massachusetts Institute of Technology and the University of Utah Northeastern University s Bay Area Regional Tech Center reports that the Assosciation for Continuing Education Instructional TV Network will televise four of the institution s state of the art engineer ing courses to member company employees starting September 23 with System Reliabiltiy Engineering Other courses announced are Intro to AI Intro to Data Communications and Principles of Telecommunications 6 MODERN ELECTRONICS November 1985 Nee a tn Your guide to every LS T thing that s new in elec i tronics computers and techni
247. t of about 950 in cash and kind Six years later the company shares would be worth 15 000 His work at the Air Force Weapons 34 MODERN ELECTRONICS November 1985 controlled rocket near Saigon 1967 U S Air Force photo Lab 1s detailed from the Silicon Zoo to Laser Reflections His Confes sions of a High Tech Spy includes his experiences in building laser bugging apparatus his involve ment with the National Inquirer which expressed interest in Forrest using his electronic equipment to fly by Howard Hughes abode to cap ture the man s utterings Of special historical interest are his details on William Shockley leaving Bell Labs to return to his hometown Palo Alto in California to establish the Shockley Semiconductor Labo ratory in nearby Mountain View and how key people left to form Fairchild Semiconductor whose defecting en gineers and physicians left inturn to turn silicon into gold with such com panies as Intel Forrest s inside information on veo Yuan An BEA 6K tvo AND GA 5 CED A page from one of Forrest Mims note books that led to his series of hand let E Ra 21 PowERk MOSFET D sp sa E MAE uo L 12 Ary SMAL OC x 2 Pe TE je LAMP 68 v c LOK gt M be te a e INFRARED LED i Spas t wid St iES RESISTOR eT aen a 3 S pn Ajo 2 di JAM L2 140 C FIBER ROCKET TELEMETRY C conr 4 THIS NOLNING ASS EM BLED TH IRCUIT
248. tal signals through fiber optic cable No special 28 Pin 276 1997 89 Printer Connector 276 1534 4 99 tools or hardware required for assembly Application 40 Pin 276 1996 99 Card Edge Connector notes included 8276 225 mest w yemin 4 99 Power Transformers Switch and Relay Values 120 VAC Primaries Type Volts Current Cat No Each Miniature 6 3 300 mA 273 1384 2 59 Miniature 12 6 300 mA 273 1385 2 79 Miniature 25 2 300 mA 273 1386 3 49 Miniature 12 6 CT 450 mA 273 1365 3 59 Miniature 25 2 CT 450 D 273 1366 3 99 Maximum capacity in a very small size Stan A erc ao ipee oe 11 32 x Sig x tia Contacts mp a 63 273 1351 3 99 dard IC pin spacing 20 tolerance VAC 12 VDC coil 4275 241 1 99 273 1352 4 99 B 273 1353 273 1511 Cat No Each 5 Mercury Switch Rated 5 amps at 125 VAC Style may vary 272 1432 49 8275 027 5 972 1433 i 49 6 Illuminated Round SPDT Push On Switch 3 amps at 120 b j CIDC in 1 2 nid yee 272 1434 29 Ae requires 12 volts A Mounts in 2 fog 273 1515 6 99 272 1436 69 7 Illuminated SPST Normally Open or Closed Switch 5 f i amps at 250 VAC Lamp requires 12 volts AC DC With red and CT Center tap 272 1437 S9 green lenses Mounts in 5 s hole 4275 678 5 95 We Can Replace Almost Any Industrial SALE 16 Range LCD Digital Multitester Or Entertainment IC or Semiconductor Reg 49 95 RADIO SHACK S NEW SPECI
249. tc Electrodes Matsikzed him Lasd Spacing 200 300 S amp eH Hesiing Yos WVdc 50V V SERIES EN Mew SEES REE Base stSSSVS SQ mo a GE NINN GOONS PLUR NN ee PEETI LEE IETS n iS5wE p wuwG Ne AARSPARSRSSSRESRONNSYENSNSSBa wn i se2sSEEEENSESUSHRSBSO N nBUM SBRI d Description UPD4164C 20 Dynamic RAM UPD41416C 20 Dynamic RAM UPD41254C 20 Dynamic RAM UPO2147AD 25 Static RAM UPO4018C 3 Static RAM UPO4A6C 2 Stauc RAM DiGI KEY Cap af 00 00012 gt 0027 Q 004 0 0056 Wd ds f uA cA a ass ES EUSacERGSE SO ownewsM N Sss3u0cmRadeshrrcfSsscogBIYYY B2SZzdP TSITZTTTCSUE FAL SAAN 741 SA9N 74LS51N 74 S5AN 74 S55N 74 S73N 74LS74N 7ALSTSN a TDAIOIGAU JALS78N zoj NES87N X NEBB9N PALSRBAN J Pce 74LSBSN 7ALSS6N 7ALS90N 7ALSS3N 74LS107N 7ALS109N 74LS112N 7ALS113N J LS114N 74L5122N 74LS123N 74L 125N 24LS126N JALST32N zB TODA 1029 7ALS136N TDA 1974 TALS138N LM339N 74L 139N 74LS151N 74 5 153N 7445 154N 74 S195N 74 8 1568N Lope whunweaw CBBERSER 8 a FETERE 29 BEBBSRERG wu M o Mus 5g257z28285gN 88885588 a ggB8sabnneccaBBBEEERZEEEBE Mo GB MOD S WNN rm oe FPS o UNN Bazhkdua r1 ZEBSBBBSES 5 Ew Canaan vc SELES SVSLS BRRR RSW BEDAE CE eusteNstyy e SERBS v K S Su 2od Owo z 8 BIB RSs Busgsws Badass BESxS SZ 558ZS
250. ted with a resistive material Applying pres sure to the surface of the pad gives an out put signal that represents the location of the touched region Simple pressure sensitive resistors also have computer applications For exam ple any of the homemade pressure sensi tive resistors described above can be con nected to the joystick input s of comput ers designed to accept variable resistance potentiometer style joysticks In this manner joystick functions can be achieved simply by pressing on a pres sure sensitive resistor rather than by moving a joystick handle Several joystick circuit configurations are used by various computer manufac turers In the simplest configuration each joystick pot functions as a two terminal variable resistor This is the ap Om c E SPECIFY Fig 6 Interlink Electronics suggested schematic symbol for the FSR proach used in IBM s PCjr A somewhat more complicated approach connects one side of the pots in a joystick to a positive voltage and the other side to ground This forms a pair of voltage dividers in which the rotor terminals supply a voltage that varies between the positive supply and ground as the stick is moved This is the approach used in Radio Shack s Color Computer Figure 9 shows the internal circuitry of a PCjr joystick The two potentiometers are linear taper devices with a resistance of 100 000 ohms Two normally open pushbutton fire switches a
251. tem plus a master POWER switch and panel lamp You can add more outlet switch indica tor sections as needed to customize your Controller for the needs of your system You can also use this device for other electronic systems such as stereo and video setups of course About The Circuit The complete schematic diagram of the Controller is shown in Fig 1 The circuit is really quite simple in design Note that throughout the circuit the standard white black green three conductor wiring scheme is used It is highly recommended that you main tain this scheme exactly and do not attempt to change it to a two conduc tor system All computer products use this wiring scheme for ac line op eration though most consumer video and audio products don t Even if you want to control power to only two conductor wired products you ll find that they are compatible with this Controller Items in your system you want to control plug into ac receptacles SO through SO The subscript n here and below simply indicates that you can have four or more of each com ponents in your Controller Power 42 MODERN ELECTRONICS November 1985 to these receptacles are individually controlled by switches S2 through Sn while the neon lamps in 2 through In respectively will light whenever the switch in a given circuit is closed and power is being delivered from the ac line You can add receptacle switch lamp combinations as needed by
252. terest Group Soft cover 340 pages 8 95 This book is a comprehensive directory of public domain and user supported software for the IBM PC PCjr and com patible computers It contains page after page of listings for a wide variety of useful software ranging from games to special subroutines to word processing spread sheet and database packages The listings account for more than 45 of the book s page count and contain comprehensive run downs on files along with extensions and one or two line comments about each file for each of the 310 diskettes available at low cost 6 each from the publisher Disks in the listings are arranged in nu merical order rather than into categories or in alphabetical order Finding what you want is no problem though because separate disk name file name and topic indexes are provided In addition to the main listings you will find two informative chapters Get ting Started offers important hints to help you get acquainted with DOS commands Program Descriptions provides capsule summaries of selected disks including a basic description of what each disk or disk set does its features and any special hardware soft ware required to run it If you own or use an IBM PC PCr or compatible computer you should also own this book bus S 100 STD Multi Bus IBM PC AT Excisor Apple Il DEC and T1980 systems as well as general purpose boards Also included in this section are motherboards
253. that can automatically detect 10 MODERN ELECTRONICS November 1985 and display IC errors under actual operating conditions A front panel zero insertion loss socket is used to plug in a known good reference IC The Model TTL 1 Chip Checker tests virtually all 14 16 18 and 20 pin DIP TTL ICs including low power Schottky TTL Though some specialized ICs and those devices that depend on external resistors or capa citors such as the 74121 monostable cannot be tested tri state bidirec tional and open collector devices can in most cases be checked Two front panel switches are pro vided for selecting the Ve and GND pins for the IC under test LEDs indi cate differences and errors between the IC under test and the reference IC Chip Checker automatically de termines inputs outputs and logic levels of the reference IC and com pares outputs to those of the IC un der test Differences between outputs of the two ICs cause one or more LEDs to light Stuck logic states and improper operation can be detected and using a dynamic latching mode can pinpoint intermittent errors that occur over minutes or even hours 349 95 CIRCLE NO 147 ON FREE INFORMATION CARD Modem Phone Combo Theall Engineering s new Model JC 1200A Smart Modemphone is fully Hayes compatible and features auto dial auto answer auto baud rate se lect and has a built in telephone for voice communications The 1200 baud mod
254. the Works integrated software pack age it consists of Plan a subset of MultiPlan Word a subset of Micro soft s Word processor File a new Data Base Management System DBMS Calendar appointment sec retary Telcom telecommunications package complete with autodialing capability and BASIC a large sub set of GW BASIC The ZP 150 is the NSS SSS SSS SSS UU I first laptop computer to incorporate this ROM based software package The computer measures 13 W x 114 Dx1 H and weighs 7 7 lbs 1995 CIRCLE NO 145 ON FREE INFORMATION CARD Video Title Generator A new keyboard type title generator from RCA can be used with just about any make video camera It lets you create on tape up to 60 characters at a time on a scene in any of four character sizes Characters can be stored in the Model CGAO010 genera tor s battery powered memory for several months and up to 40 fre quently used words can be stored in the word register This titler can also store and recall up to 20 groups of characters in either page at a time or scroll forward backward format Other features of the titler include curtain and window special effects stopwatch display calendar and time lapse cap ability The Model CGAO10title generator measures 8 x3l 4 x1 and comes with a belt clip 249 95 CIRCLE NO 146 ON FREE INFORMATION CARD In Circuit IC Tester Chip Checker from Microcraft Corp is a full mode TTL in circuit tester
255. the industry You ll find our 132 page catalog packed with a full line of test equipment computer acces sories speakers CATV equipment television parts and the largest selection of original Japanese semiconductors in the country Our product selection puts us at the top our low prices and fast delivery With so many electronic catalogs out there how does MCM Stay at the top us there CALL TODAY FOR YOUR FREE COPY OF CATALOG 10 CALL TOLL FREE 1 800 543 4330 IN OHIO CALL 1 800 762 4315 IN HAWAII OR ALASKA 1 800 858 1849 MCM ELECTRONICS A DIVISION OF PREMIER INDUSTRIAL 858 East Congress Park Drive Centerville Ohio 45459 13 434 0031 SOURCE NO ME 5 CIRCLE 85 ON FREE INFORMATION CARD ee W HARDWARE HACKER Finding out about bar codes new fiber optics goodies a dual monitor for the Apple Ile using a word processor to do isometric drawings new data books By Don Lancaster If you happen to be in the neighborhood why don t you stop in at a Gila Valley Ap ple Growers Association meeting Thurs day nights from 6 to 10 in Eastern Arizo na College Room T8 right here in beau tiful downtown Thatcher If you are very lucky you might even get to be the first Modern Electronics reader to qualify for afree GVAGA tinaja quest Also Syner getics now stocks autographed copies of most of my books in case you have been having trouble picking them up locally Lots of offbeat so
256. the 150 000 ohm re sistor with another resistor Similar Fig 2 Use the actual size etching and drilling guide at the left to fabricate a printed circuit board for the project 46 MODERN ELECTRONICS November 1985 ly if you want a faster turn off you can do the same with R2 There are two common lines in this circuit One is connected to the nega tive side of rectifier assembly RECTI and serves the control cir cuitry The other is connected to the ac power line and serves asthe return path for the load current It is essen tial that these lines be kept isolated from each other While you can usea power or small pulse transformer to provide isolation an opto coupled triac driver shown in Fig 1 as C offers a neater solution Inside C7 are a light emitting diode LED a detector and a small triac In the Fig 1 circuit the low level pulses coming from Q3 make the LED in C emit short bursts of light that are picked up and con verted into electrical current pulses by the internal detector This small current triggers the internal triac ON lt _ o w m o gt a o N 28 3 2 18 1 06 0 2 8 2 3 ES cr 4 which then outputs pulses to the gate of power triac Q4 triggering it on so that it delivers current to the lamp Potentiometer R4 serves as a master control of the pulse rate and provides both manual control and a limit in the brightness of the lamp plug
257. the cord from the Mello Phone inio your telephone wall receptacle Note FCC Rules prohibit the use of this type of ringer with party lines and coin operated telephones One last test is required if you have 88 MODERN ELECTRONICS November 1985 Touch Tone service The tone dialer in a Touch Toneset is powered by dc which must flow in the proper direc tion for correct dialer operation To test this operation install the Mello Phone lift your telephone handset and dial out If you find that you can t dial out the bridge circuit in the Mello Phone has reversed the volt age polarity required by your tele phone To correct this set 52 to its alternate position In C onclusion Some final notes concerning opera tion of the Mello Phone Firstly a test feature is built in With the Mel lo Phone powered up and plugged into the telephone line lifting and re placing the handset results in a beep from the phone ringer indi cating that it is functional and ready for an incoming call Secondly when you change tune selection with S be sureto perform this test routine to re set the memory pointer If you don t the first ring burst will result in some random sounds or a partial tune This condition is only temporary however and will correct itself if you forget to run the test routine Lastly you might want to housethe circuit in a metal or plastic enclosure that can be mounted on a wall or be pla
258. ting Radio Shack stores and dealers CIRCLE 48 ON FREE INFORMATION CARD Noyember 1985 MODERN ELECTRONICS 3 LETTERS e m writing to correct an error in Por table Computers 85 in the August is sue His statement that the TRS 80 Model 200 doesn t support PEEK POKE or CALL statements in BASIC is wrong The Model 200 supports all the BASIC commands available to the Model 100 with a few additions and improvements as well Other than that error I thought his article was well written and fairly pre sented the computers mentioned A recent addition to the laptop group is the Spectravideo Bondwell a 64K CP M computer with 80 x 24 line LCD display built in 360K 3 5 disk drive 8 hour re chargeable battery supply and bundled software Wordstar Calstar Datastar Reportstar Xmodem Scheduling pro gram and several public domain utili ties It is the only laptop that has a flip top screen designed for field use it has a 180 degree angle of freedom instead of stopping at a preset vertical angle you can open the display to a horizontal posi tion Its best feature is its price 999 95 Bondwell International 3300 Seldon Court Fremont CA 94539 While I m writing thanks for resurect ing the original concept behind the now defunct Popular Electronics 1 used to subscribe to it way back when Terry Kepner Peterborough NH Not For Export The David Wolf article on Akihabara An Electronic
259. tions have been under construction since summer with initial programming scheduled for K 2 in February 1986 More than 400 standard power commercial TV sta tions out of a total of 900 have already accepted the service Hubbard Broad casting s U S Satellite Broadcasting Inc has now leased four of the K 2 transponders for more than 85 million in both line and field space remains for two audio channels as well as digi tal commands for both sync restora tion and scrambling Digitized the two encrypted audio channels con trol data signals and 3 58 MHz chroma sync reference occupy the horizontal blanking period in addi tion to an auxiliary data channel During the 1 3 millisecond vertical blanking period digital sync infor mation is transmitted and video be comes inverted When the signal is received sync is recovered from the vertical interval audio is removed from horizontal blanking and converted back to ana log video is reinverted and regener ated sync locks a steady raster Link abit scrambling we are told will handle up to 250 channels of infor mation and a 56 bit program author ization word for customer access A block diagram that compares Time Division Multiplex Component TDMC B MAC to B NTSC is shown in Fig 1 The switch at the far to distribute its news service and other programming to affiliates RCA Americom says that RCA s strong Ku band entry occurred because 50 state C
260. tor is also included Waveforms are displayed inal x 1 5 areaon the face of the blue white CRT in a five horizontal by four vertical graticule division format A built in calibration circuit is included 355 CIRCLE NO 149 ON FREE INFORMATION CARD Sophisticated Scanner Regency s Model MX7000 is one of the few programmable fixed mobile scanners that can cover frequencies as high as 1 3 GHZ It provides con tinuous coverage between 800 and 1 3 GHz as well as the usual 25 to 550 MHz In addition the scanner can also monitor vhf and uhf TV audio FM broadcasts between 88 and 108 MHz and all civil and military air craft bands Programming the scanner is sim ple Entering frequencies is accom plished by keying in their numbers via acalculator style keypad A beep as a tone is heard when you have made contact Once frequencies are pro grammed into the scanner the key board can be locked to prevent any one from accidentally changing them In addition to scanning as many as 20 channels the scanner can search through an entire band for an active frequency When a call is received the frequency of the broadcast ap pears in the numeric display You then have the option of continuing to search or storing the new frequency in one of the 20 channels Search in crements of 5 12 5 and 25 kHz are available The multifunction lighted LCD display shows channel numbers dur ing scanning channel
261. ts has re cently published a comprehensive catalog in which the company s entire line of breadboarding interconnection and test ing devices are listed illustrated and de scribed The 30 page catalog is organized by product category to allow the user to quickly zero in on products in his area of interest Among the products listed are DIP and surface mount IC test clips sol derless breadboarding blocks and sys tems cable testing and connection de vices and breadboarding and prototyping accessory items New items in the listings include the Surface Mount Test Clip a Low Profile Logical Connection and November 1985 MODERN ELECTRONICS 77 a a lustrated with schematics block dia grams line drawings and photos to pre sent as complete a picture as possible Coverage is quite complete Sanyo MBC 550 555 Beginner amp Inter mediate Guide by Fred Blechman CBS Educational amp Professional Publishing solf cover 361 pages 17 45 This book is a software oriented ad venture that is written around and sup ports a number of programs and utilities on diskette available separately Con taining 24 chapters and five appendices it steps you through the ins and outs of us ing the Sanyo computer a low cost MS DOS machine that is compatible with some IBM PC programs First comes an introduction to the computer its key board and display Then comes a discus sion of how to use Sanyo BASIC which differs from other
262. u tomatic Teller Machines Heal Thyself CONSUMERTRONICS CBS 60 Minutes stardom 2011 Crescent Alamogordo NM 88310 CORRESPONDENCE to Asia for ae re lationship Free Information AAWS ME Box 2777 Orcutt CA 93455 0777 Tel No 805 937 5230 COOL IT Keep valuable electronic comput er video amp audio equipment cool New small inexpensive fan fits anywhere Infinite life Amazing specs NO RFI NO EMI Free de tails 1 year warranty Check MO COD 29 95 3 00 S amp H THE BEE FAN At mospheres 1207 Eighth Avenue NYC 11215 718 788 6799 a INVENTORS his INVENTORS Can you profit from your idea Call AMERICAN INVENTORS COR PORATION for free information Over a de cade of service 1 800 338 5656 In Massachu setts call 413 568 3753 COUNTERMEASURES BUGGED Wiretapped Find out fast Countermeasures equipment catalog i Capri Electronics Route 1Z Canon GA 30520 TT m o Da OT D M E 1 800 344 4539 AK Puerto Rico 218 681 6674 Telex 62827914 TWX 9103508982 DIGI KEY CORP NATIONAL SEMICONDUCTOR PANASON Tem JODES DIAMOND TOOL UNGAR OK MACHINE EWC INC INTERSIL AD 256K 262 144 x 1 DRAM 150NS 5 70 1 39 95 9 Es CW INDUSTRIES AMDEK G E EAC INC J W MILLER AAVID ENGINE F f IGAR YAGEO J W MILLER LUXO Factory Firsts 3C CHEMICALS ARIES PLESSEY __ TED CIRCUITS
263. urces for neat stuff this month so let s get with it How can I Find Out About Bar Codes Bar codes are those funny product code labels you ve no doubt seen at the grocery store The best running commentary I ve run across on the societal impact of bar codes has appeared on the front cover of every issue of MAD magazine during the past several years Chances are that you would prefer some more technical information than this though It turns out there are five major bar code standards The one you already know the most about is called the UPC short for Universal Product Code You can get a copy of the UPC standard from of all places the UPC Council Ac tually they just renamed themselves the UC for Uniform Code While this sounds a tad presumptuous they do seem to be running away with all the marbles Other competitive bar coding schemes include the Code 3 of 9 used by the military and the automotive people the Interleaved 2 of 5 used for containers and transportation the Codabar also used for transportation and the EAN European Article Number standard Some further details on these standards appear in the Hewlett Packard bar code components folder publication number 5954 2152 H P has lots of fairly expen sive solutions to bar code scanning and reading including their HBCR 1000 series component bar code readers HBCS 4300 industrial bar code wands and HEDS 1000 reflective sensors Check out their Optoelectroni
264. ve readers well in understanding how tough it is foralittle guy to go up against a giant corporation when try ing to assert his rights to a develop ment The inventer of FM radio Ed win Armstrong must have suffered extreme anguish during his legal pur suits against RCA finally commit ting suicide Forrest too was exas perated but wrote about his ex perience instead which included house searches that stunned him and other unwelcome actions he reveals I recall giving a deposition in the Bell Labs case during this period which concerned fiber optic communica tions Read it and weep The author delves deeply into the world of computers of course dis cussing his first hand experiences with people who were pioneers in the computer industry including startup of the Radio Shack computers and his secretive introduction to the TRS 80 Model I computer in a Texas warehouse In all Siliconnections is an en thralling inside look at an industry founded on silicon and how Forrest Mims interacted with it on his journey as an independent electron ics computer journalist experi menter and inventor The book is highly recommended to anyone interested in what makes an important part of this amazing high tech industry tick as well as providing interesting reading through the author s sprightly writ ings about his personal involvement with a host of people who contrib uted to the growth of silicon based equipment Eight
265. ver is not going to impose any limitations on the dynamic range or signal to noise ratio achieved by even these new program sources Fig 4 Curves show range of receiver s midrange tone control RIAA equalization was accurate to within 0 4 dB from 30 Hz to 20 kHz At 20 Hz response was off by 1 0 dB but that can be attributed to the presence of the subsonic filter which is in circuit at all times Figure 5 shows the action of the separate continuously variable loudness control at its maximum flat position up per curve and at its minimum setting which attenuates mid frequency levels by around 40 dB regardless of where the treference level has been set by the sep arate master volume control This dual control arrangement allows you to set up the volume control for lis tening levels such as might be heard at a live performance Then the Loudness control is used to lower loudness levels to loudness levels suitable for a home listen ing room Adjusting loudness contours in this way results in more accurate loudness compensation than could be accom plshed with the typical Loudness Switch used with the volume controls on most other receivers and amplifiers Summary The tuner section of this receiver is at least equal in performance to that of separate FR Relative output dB o 29 Frequency Hz 1 dB D L 11 8dB R 13 1dB 1 MAKHz Relative Output dB tuners costing near
266. y disk drive The low price a compact but respon sive keyboard and the convenience of ample disk storage and portability an average four hours use per charge though the disk drive is as loud as a gas engined model airplane make the 2000 attractive So does its PC compatibility I downloaded several programs from an IBM and one from a DG One disk and all ran successfully Kaypro s options are inexpensive An upgrade to 768K RAM is 195 and a ser jal to parallel adapter making up for the lack of a printer port is 65 Another a 155 base unit that connects to external 315 or 5 drives 295 each or a card that lets you use a desktop s drive 95 has a slot for a Hercules or similar color card to drive an RGB monitor So should you rush out and buy a Kay pro 2000 No because its 25 x 80 LCD is truly awful adjustable to only two an gles both too faint and dim to read unless under bright direct light If only the screen were tolerable the 2000 would be the best laptop yet Asis the world s still waiting for a truly viewable LCD display Early impression The world will still cost answer to the Data General One be waiting after seeing the Heath Zenith ZP 150 I ve spent five minutes with the machine thanks to the portable comput ing specialists at the Pico magazine of fices but wasn t thrilled Microsoft Works looks like a nice 224K ROM pack age combining most of Word Multi pian GW BASIC file
267. your system the only limit being the amount of power the EMI filter suppressor can handle Main power switch S determines whether or not ac line power is avail able for switching to the individual ac receptacles With S closed this power is available and can be selec tively fed to the receptacles With S open no power is available regard less of the status of the other switches in the Controller The circuit shown in Fig 1 is a minimum Controller system There are of course a few modifications you can make to it to further custom I1 thru Ij Panel mount neon lamp as sembly S1 Dpdt miniature toggle switch S2 thru S Spst miniature toggle switch SOI thru SO Chassis mount three conductor ac receptacle Misc EMI filter suppressor module EMI filter Suppressor s2 PARTS LIST Corcom Model 8109 or similar suit ble metal enclosure 5 W x 5 4 D x 3 H Radio Shack No 270 253 ac commodates a four receptacle sys tem adjust size accordingly for more than this heavy duty three conduc tor ac line cord with plug and strain relief 12 or 14 gauge stranded S3 white black and green wire wire nuts 5 spade lugs optional rubber feet 4 dry transfer lettering kit clear acrylic spray etc Note You can substitute illuminated push on push off illuminated switches Radio Shack No 275 676 for 12 S2 through I S combinations Fig 1 Overall schematic of a minimum c
268. ystem at a C N of 13 dB and a may beas low as3to 5 ohms The ex S N of 48 dB a level approaching 54 dB studio quality Receiver remote controls in addi tion to the usual TV and VCR func tions will also execute descrambling commands the key password and programming while rendering a se lection menu on the TV screen You can also expect polarity and switch able skew separate C and Ku band selections signal strength indica tors up down audio and channel tun ing variable audio and on board ad justable automatic gain control This of course is not a stripped down sat ellite receiver and is far removed from any eventual Ku band 500 system fu turistically predicted But it will cer tainly reproduce superb noise free sound and pictures within a reason able satellite footprint as shown in Fig 2 EIRP is in watts denoting re ceive signal strength available At this point we have no idea what RCA satellite receiver prices will beat the retail level Nor do we suspect does RCA At whatever price is final ly decided upon you can be sure that this system when it goes into opera day as well as the usual 261 5 lines per field of interlaced scanning Consumer Meaning What this all means to satellite en thusiasts begins with additional pro gramming even though it may be scrambled Follow this with excellent video and dual channel stereo sound availability of 16 transponders re ceived on 1 to 1

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