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Rad io - American Radio History

1. 7 10 E aelel jp R34 10 14 13 3902 fof 1 5Hz 12 3 U 05 C8 1 9 5V R36 12V 51V 1 74 590 9 74 soURCEO 62 1N4733 2 7 C19 D4 a A5 C17 12V 1W G n DUTPUT 4TuF ian FIG 3 SCHEMATIC of the Heart Rate Monitor If you desire rather than hardwiring opto sensor OED1 to front panel jack J1 as shown in the diagram you can add a male plug to the opto sensor cable and plug it into J1 If you opt to leave the cable hardwired you can eliminate jack 1 BARRIER EL EMITTING LED 24 IR SENSITIVE TRANSISTOR DENDTES PIN 1 FIG 4 CONSTRUCTION and pinout for the OPB 706 infrared reflective sensor gered by a negative pulse from Q2 to produce a 300 us squarewave that helps eliminate multiple triggering on both the R and T waveforms The pulse is also used to light and trigger the beep generator IC 4 The charge pump 1C3 produces a 100 us pulse cach time it s triggered by a heartbeat signal from IC2 Resistor R17 is an internal calibration potentiometer that adjusts the width of the pulse The actual pulse width is dependent upon the circuit values and tolerances in the low pass filter circuit Quality components are a must in this part of the circuit in order to maintain stability 5 The low pass filter IC4 is used to smooth the 100 ms pulses into a DC vo
2. promptly in writing You may even g State Lip Eu get the specialized pod of all ie 5 C the specialists And the answer 2 y OLEO gt gt gt you get ene a part of your per Check box for 3 1 Bill information Veteran Active Duty 2 manent reference file You may find MAIL TODAY 3 this even better than having a class room teacher 21 TVI ste eee ee ca aoa ae ee ee waww sorts aima t 2 measures 96 pp 8 x11 photos diagrams and hal 3 8 Mail to 1 ound 21423 4 95 512x81e softbound 21037 10 50 E Howard W ams amp Co Inc 0 West Street ndianapolis IM 46268 e W 6 C 317 298 5564 5 1 1 4300 West 62nd Street Indianapoli is Indiana 46 E 206 ams mm LETTERS continued from page 16 The importance of all these test reports is not so much the actual numbers ob tained upon the test bench but the overall impression that the reviewer is able to SUPERCONDUCTING COIL It s too bad Mr Ecklin Letters October 1978 didn t elaborate on how charging and discharging a superconducting coil or any coil for that matter is going to solve the energy crisis While a superconducting coil is useful for permanent magnets and some kind of magnetic shieldi
3. LED209 T 1 3mm Red 09 caves NUMBER LED211 1 3mm Green 14 20212 T 1 3mm Yellow 13 20220 1 3 4 5mmRed 11 16K MBC 016 8 SBC 016 715 32K MBC 032 8 S8C 032 1125 48K MBC 048 8 SBC 048 1475 M s 20222 T 1 3 4 5mm Green 15 32K MBC 032 16 SBC 032 1125 LED224 T 1 3 4 5mm Yellow 4 BRAND NEW 4 1973 2500 Been gt IC MASTER pages DISPLAYS I T Complete integrated circuit FND357 375 Common Cathode 5245 51 09 Texas Instruments U gain selo tos Master FND300 500 Common Cathode sped 51 09 pode FND507 500 Anode 51 109 Low Profile Sockets 4 FND567 500 Common Anode SEA 129 01727 630 Anode 5 52 49 1 gt consumer circuits 3 Finest Quality Socket available in the mer Free Quarterly Updates 39 95 Bo commen anpe S 29 world Nobody can match Texas Inst 1 si 107 ruments quality a unique combina ISOLATORS tion of I C technology and multi 11112 Opto Isolator 1500V 059 5049 metal expertise MCT6 Opto Isolator 1500V S 51 29 064 15 58C 064 1795 Over one pieces in stock LINEAR I C S ak in pic TF LM324N 49 Quad Op LM339N 49 Quad Comparator M741CH 3 14 PIN 12 24
4. 10 1 00 10 1 00 10 1 00 6 1 00 15 1 00 12 1 00 15 1 00 28 1 95 1 95 50 195 ie 100 035 035 035 04 04 075 08 13 17 22 21 22 22 23 25 29 6261 10 ES BULLET ELECTRONICS P O BOX 401244R GARLAND TX 75040 214 278 3553 WHEEL of FORTUNE POPULAR GAME DEVICE uses LEDS TRANSISTORS AND IC TO GIVE THE EFFECT OF BRIGHT RED BALL SPINNING AROUND NUMBERS UNIT EMITS A CLICKING SOUND AS BALL SPINS AND FINALLY STOPS QN A NUMBER KIT COMES WITH ALL PARTS PC FACEPLATE CASE AND BATTERY INCLUOEO 2 Crystal 14 0 Oscillator clock oscillator C23289 _ 1 98 Sold state Voice Operated Switch Complete and as 99 mbied With schematic SEND FOR YOUR FREE 2 Electronic Warning Flasher Kit This battery operated device continuously emits bursts of intense light Great safety device for bicycle riders skiers hikers boaters amp campers Comes complete w all electronic parts quality glass epoxy P board amp easy to understand instructions Uses high output xenon flash tube which flashes 3 times per second when batteries are fresh Operates continuously for 12 hours on 2 alkaline C batteries You need only to supply the batteries and if C23207 6 95 desired a battery holder
5. RADIO ELECTRONICS BEST PRICE IM THE COUNTRY RCA 1000 OHMS PER VOLT MULTIMETER DIGITAL CALENDAR CLOCK COMPLETE WITH MOTOR AND TIMER EASY TO READ COLOR CODED 120 5 WATTS METER POCKET SIZED GOES ANYWHERE PRECISION PARTS USED TO INSURE ACCURACY COMPLETE WITH TEST LEADS DISPLAYS HOURS GENERAL ELECTRIC TIMER FEATURES HOUR AND MINUTE DISPLAY WITH ALUMINUM FRONT PANEL COMPLETE WITH RELAYS AND AC MOTOR PROTECT YOUR ELECTRONIC EQUIPMENT WITH 4 95 THIS AUTOMATIC MODEL 3AS BELL amp HOWELL PARABOLIC MICROPHONE Complete with Stand and Plug Tape office conferences and school lectures 5 95 SOLD FOR 23 95 TURN OFF TIMER LENS LIGHT ILLUMINATING MAGNIFIER A must for PC work 1 99 120 V 60 cy POWERACE ALL CIRCUIT EVALUATORS WITH POWERACE 101 General purpose model for prototyping all types of circuits 84 95 POWERACE 102 Complete digitat proto typing jab w FREE built in logic probe 114 95 POWERACE 103 Tripie output power supply for prototyping both linear and digital circuits 124 95 Breadboard elements accept all DIP sizes 1680 Soiderless plug in tie points Short circuit proof fused power supplies SAVE ON BATTERIES MULTI VOLTAGE AC ADAPTOR 300 mA 3 4 5 6 7 5 9 12 V 4 WAY PLUG 3 99 2 WATT SOLID STATE AMPLIFIER all parts pre assembled ona mini PC board ITC EXCLUSIVE 99 WELLER 25
6. 12V DC MINI RELAY 6V SPDT 2AMP 1 30 12V SPDT 1 60 12 2AMP 2 50 12V 4PDT 3AMP 3 50 5 5 SVDC 3 Terminals Positive Voltage Regulator Hard to find Fairchild 78 5 3 Package input 8 5 20V OC Output 5V 5 Load Regula tion 1 Only 8 75 ea VVVVY ELECTRONIC SWITCH KIT CONDENSER a Touch On Touch Ott uses 7473 LC and 12V relay 55 50 each ULTRA SONIC SWITCH KIT NUMERIC HEXADECIMAL LEO DISPLAY WITH LOGIC HP 5082 7300 e 4 7 Dot Matrix 0 4 Digit With On Board Driver and Memory TTL Compatible BCD Input SPECIAL 9 90 Each GIANT SIZE VU METER Kit includes the Ultra Sonic Trans ducers 2 PC Boards for transmitter and receiver Ali electronic parts and instructions Easy to build and a lot of uses such as remote control for TV garage door alarm system or counter Unit operated by 9 12 DC Kit includes high voltage coil power transistor heat sink all other electronic parts and PC Board tight tube not included WITH CASE ONLY 6 50 PER KIT HEAVY DUTY CLIP LEADS iss 10 pairs 5 colors Alligator clips on 22 long lead Ideal 2 20 pack for any testing MINI SIZED 1 C AM RADIO 50 D TI76477 Size smaller than box of matches GENERATOR Receives all AM stations Batteries and ear
7. 2 2378 144002 100 10 for 85 20 tor 86 25 DTL FAIRCHILD IC s gales and flip flops Dip 100 1 29 50 1 30 RECTIFIERS so 35 36 2379 1N4003 200 10197 9 20 9 m 1 24 VOLT 50 Mil TRANSFORMER 115V inpul open frame 1X1X3 4 5631 1 29 2 for 1 30 0 100 2380 490 TOs 113 stor 129 m 5 SPST PUSHBUTTON MOMENT ARIES rt angle pc mt 56 35 1 29 10 for 1 30 e il Sand Type 520 54 Ss 2381 1WN4005 600 10 for 1 39 201 1 40 lated 35099 129 2forl 30 400 41 62 2382 1N4006 800 10 tor 1 49 20 1 50 m1 3x4 DOUBLE SIDED PC BOARD hi quality copper plated 5694 29 60 for 1 30 Hermet Construction 09 a 2383 144007 1000 10 for 1 59 20 for 1 60 8 30 RADIO AND KNOBS 2551 styles sizes 4217 virens teat EXE DONO dee 128 1 or 1 E OH 60 TUBULAR CAPACITORS assl volts and sizes 4219 1 29 420 for 1 30 m r 4 ROCKER SWITCHES solder tab 5 3302 1 29 8 for 1 30 Cat 82CUS677 Specify voltage 50 POWER RESISTORS 3 5 7 w axial pop sizes 228 0 00005 1 29 100 for 1 30 a LEDS 525 SURPRISE all kinds of parts ina pak 294 lt i510 129 BEEM O LIGHT YOUR CHOICE 6 for 1 29 12 PANEL SWITCHES rotar
8. 88 6 amp 7 Jameco 102 103 24 _ _ __ 98 Lakeside Industries 92 52 _ _ _ 27 43 _ 108 42 Micro iMart lt uuu aa ahi 100 Millco Industries 92 70 ___ __ 6 _ _ 106 National Radio Institute Div of McGrav Hill 8 11 National Technical Schools 28 31 71 _ gt 98 44 83 32 Machine amp 15 5 gt gt gt gt gt I 20 Optoelectronics Cov 3 22 PEEL 78 46 S Electronics snaar rore 80 65 __3____ _ 80 18 Poly ae lll 21 QUES aro omm 109 15 a Se 110 BE 12 24 25 4 3 __ 93 39 Ramsey Electronics 99 27 Rye Industries 76 s 7 Howard W Sams amp 23 68 5 49 cuc ANC 16 9 Solid State 5 reann 100 59 Southwest Technical Products 85 Spacecoast Research 90 Speakerlab Inc
9. WHEN YOU STARTED LOOKING INTO VIDEODISC PLAYER you are suddenly shocked by the kinds of circuits you ve never seen before The more interesting ones we ll run through here Let s start by taking a look at the signal processing circuits As described in our introductory article last month a laser beam scans the surface of the videodisc in the Magnavision player To keep that beam following the right program track three photodiodes are arranged to detect proper orientation of the laser beam These photodiodes and their associated preamp module are physicaliy 4oca on the slide assembly A block diagram of this circuit T 1 i el ias to all the diodes The out put D are applied to a summing circuit where A B and are produced These two signals are now applied to still another summing circuit and amplifier to create the total FM signal A B C D The pairs are also fed to a different circuit to produce the focus error voltage A B D The output from photodiodes E and F is applied to another amplifier t produces the true radial error voltage This voltage is high frequency emphasized to create another radial error volt age called radial error with high frequency compensation We ll look at how both of these signals are used when we exam ine the servo circuitry but for now we will continue to look at fromediodes A B TOTAL FM SIGNAL FOCUS ERR
10. scaling of 1C4 b s meter drive circuit The meter is in tended to be calibrated with OuA as 50 BPM 20 uA as 70 BPM and so on with 100 uA as 150 BPM If a 50 uA meter 15 used R21 and R22 must be doubled in value to equal a total resistance of 33 330 ohms The charge pump and filter circuit are designed to provide I volt DC to IC4 bat 60 BPM or I Hz and to increase that voltage linearly with an increase in fre quency This results in a 60 uA change through the meter when the heart rate increases from 60 BPM to 120 BPM 6 The beep tone generator 1 5 pro duces a 300 ms beep with each heartbeat The generator operates in a keyed and modulated mode controlled by IC2 and As long as pin 4 is kept low IC does not oscillate When IC2 pin 3 goes high it allows IC5 to produce a tone for the duration of the pulse of 1C2 The fre quency or pitch of the tone from IC5 increases with an increased heart rate and vice versa The voltage on pin 1 of IC4 a varies the conduction of Q3 which in turn varies the trip point of IC 5 and its operating frequency The response of Q3 is not linear but it does vary noticeably with the heart rate II this feature is not desired eliminate R25 R27 and Q3 No jumper connections are needed just leave IC5 pin 5 disconnected 7 The calibrator circuit IC7 IC9 generates a 1 5 Hz or 90 BPM square wave that is derived from the 60 Hz line frequency It is used to initi
11. gain beta to Send FREE catalog of the complete 200 in 3 ranges Checks leakage Uni value packed EMC line and name of versal test socket accepts different base local distributor configurations Identifies unknown tran sistors as or PNP NAME Dynamic test for all transistors as signal amplifiers oscillater check in or out of ADDRESS circuit Develops test signal for AF IF or RF Circuits Signal traces all circuits Checks condition of diodes Measures battery other transistor circuit power supply voltages on 12 volt scale No ex ternal power source needed Measures circuit drain or other DC currents to 80 milliamperes Supplied with three exter nal leads for in circuit testing and a pair of test leads for measuring voltage and current Comes complete with instruction manual and transistor listing INSTRUMENTS Transistor Analyzer Dynamic In Circuit Transistor 5 Radio Tester Signal Generator Signal Tracer Voltmeter Milllammeter Battery Tester Diode Checker Transistor Analyzer 4 44 212 ELECTRONIC MEASUREMENTS CORP 525 Broadway York WY 10112 PW Wu cm P f ab R ik t PLUG IT IN AND TAKE COMMAND h 4 BSA X 39 CONTROL SYSTEM E LI I bmi X 10 Remote Control For Lights and Appliances NO WIRES NO HASSLES System X 10 requires special wiring or complicated installation
12. 2590 1 29 16 for 1 30 20 1N4148 SWITCHING DIODES 4 per e oe ba spam 6 4 w tri er diode u 8 PS vas m Paks buys up fsttory close out fron goon THE FAT MALLORY AA E cp 18 age plastic plug black new 25803 1 29 2 07 1 30 have Heatanked 9 Watt Amp 8 40 SQUARE DISC STYLE CHOKES color Coded 3203 Q Q timeas 1 29 BO for 1 30 gup RF ung ue i e Du MERCURY 1 49 8 30 TRANSISTORS TO92 2N4400 series u testi 3291 TEE lw 563 5 1 29 60 for 1 30 a W a i bu ley 6 TRANSISTORS TRANSFORMERS audio inter etc mini 43295 oce 5 1 29 12 for 1 30 bei A DE v peris BATTERY 2 tor 1 50 15 PRINTED CKT TRIMMER POTS asst values 1 3346 1 29 30for 1 30 Catone SEED m 7 2N3055 HOBBY NPN 5 5 3 23771 1 29 14 for 1 30 gt Cat No 92CU5679 E x m Buy any item on this page and get 2nd item STTEE 1N4000 Epoxy Rectifiers gt rd SANDY DISC no r on ne p Cat Type volts Sale 1 SALE of the same cat lt 0 V V 10 z Ek 2 2377 144001 50 1010 75 2010 76
13. C511 20 amp Current Shunt 20 00 24 Measurement Ranges U Model 935 DMM 149 00 LI BE9 Battery Eliminator 100 1000VDC 5 ranges 0 1 Accuracy CC35 Vinyl Carrying Case 7 00 120VAC 50 60Hz 15 00 1004V 700VAC 5 ranges 0 5 Accuracy l Payment Enclosed Bill my Master Charge O Visa O I 14A 2A DC 4 ranges 0 5 Accuracy Add 3 00 t stage and handling N Y residents add sales tax 10 2 AC 4 ranges 0 75 Accuracy 100m9 20M9 6 ranges 0 1 0 3 Accuracy Account _ Exp Date 1 3 Digit 1 2 Liquid Crystal Readout Automatic Polarity Indication Name _ Automatic Overload Indication Automatic Low Battery Indication Oras po Optional Battery Eliminator Available City State Zip for 120 10 50 60Hz line operation J ome GEB CURED G wam s s q w Qm s G uwa G sms u ma wa wa wa w s wa sa 6 L 3 x 1 Weighs 11 oz CIRCLE 69 FREE INFORMATION adio Electronics THE MAGAZINE FOR NEW IDEAS IN ELECTRONICS Electronics publishers since 1908 JULY 1979 Vol 50 No 7 BUILD ONE 35 Heart Rate Monitor Provides a direct readout of your pulse rate in beats per minute ON THE COVER by Mark C Worley 42 Digital Thermometer Using an infrared sensor that With a 3 2 digit LED display this device measures temperature in clips to your finger this Heart Celsius and Fahre
14. Pa as DIODES Address l E 8 2 S1 1 5 18914 15 1 00 l 34350 35 e 184003 12 1 00 State Zip Code 745153 1 95 175 60ns oe 1 REEL pas 184148 15 1 00 Indicate the offer you prefer L i C 1 Year 12 issues ONLY 9 98 Payment enclosed L p You save 5 02 off newsstand price Bill me 2 Years 24 issues ONLY 19 00 J Check here if this is new 1973 South State Col lege Anaheim Ca if 92806 Save More 11 00 off newsstand price subscription 3 Years 36 issues ONLY 27 00 Check here if you extend Visa MasterCharge Minimum Order 10 00 pave en pe Save 18 00 off news ing or renewing your sub scription Check or 714 937 0641 Add 1 00 tor Ap Extra Shipping Canada 3 00 year other countries 5 00 year No COD Cal Res add 6 Bs ee man ama am um um um um am am CIRCLE 26 ON FREE INFORMATION CARD FREQUENCY COUNTER KIT Outstanding Performance eo CT 50 Incredible Price 8995 Er SPECIFICATIONS Frequency range 6 Hz to 6 MHz 300 MHz with CT 6CD Resolution 10 He 1 ses 1 sec gate Readout 8 digit 0 4 high LED di ct readout in MHZ Accuracy adjussbie to 0 5 ppm Stability 2 0 ppa over 10 40 temperature compensated 1 megohm 20 pt direc 50 ohm with CT 62C Dverload 5 maximum all modes SenSilivity le
15. 7425 28 o 1024X8 EPRM eee I s 250098 8 50 vus ils i 7430 14320115 1 25 mk pres 2 745201 LM3228 1 75 7438 24 Le MI tri 7440 20 256X1 Static RAM A 134075 1 25 7445 75 1 95 50 ns L4340 T12 1 25 et 7451 20 s P i jJ ajo D LM340T15 1 25 2 7454 20 T nes I YOUR ee ULN2001 147118 39 EE POCKET 95 5 High current Drivers _ ox You can save up to 18 when you subscribe to Radio 7486 35 Darlingtons 756 i 95 Electronics and have the best electronics magazine of all 4 mi cda us delivered to your home often before it runs out on the news 7455 ke IM C1 58 LM749N 85 stands Every of every issue is with electronics 7493 4 Dual Op Amp e in news and excitement you won t want to miss Make sure you i 24 Sar m m 1 95 get every issue and save money too Mail the money 74123 49 Saving coupon below today Get the excitement every ey An 5 5 b TRANSISTORS month 74151 2N2222A 5 1 05 75 TIMER gt dd s SUBSCRIBE TO RADIO ELECTRONICS 40G9 Ad BEER EE 2 8 _ 283904 5 1 00 3 74175 75 s s Mail to Radio Electronics a oH 8038C E 244403 5 1 00 SUBSCRIPTION DEPT P O BOX 2520 BOULDER COLO 80322 2955 1 20 74195 65 wisine Gen 1 please print
16. 92 51 Sprague 1 22 14 Tab Books 86 40 Corp 106 25 110 31 Ungar Div of Eldon Industries 79 34 __ ______ 84 89 28 Wersi Electronics 67 17 Zemo eS rk ome 17 American Heart a ae We re Fighting For Your Lite 1 SS coo eee ee MOVING Don t miss a singie copy of Radlo Elec tronics Give us LABEL Six weeks no tice Your old ad dress and zip code Your new ad dress and zip I I I l name please print address city state to Radio Electronics SUBSCRIPTION DEPT P O BOX 2520 BOULDER COLO 80322 31410 Aue ououdodorur AUB 1 0 03 31 09003 5 3 onbrun os 5 5 S ONI S9INOHIO313O1dO PEELE epliol3 104 ulti 3 N 1285 NOILVANHOHNI 3383 NO 37243 r m e LS0Z L44 0807 L SOE 5 asipugua sSu 910 90 sap snu 5V IguosSj q 00 ES 9
17. CB standard 2meter Scanners Amateur Bands General Communication Industry Marine VHF Micro processor crystals Send 10 for our latest catalog Write or phone for more details Jan Crystals 2400 Crystal Drive Ft Myers Florida 22907 ali phones 813 936 2397 easy to charge EEOC CONSUMER ADVOCATES If you think that being business makes you INDEPENDENT think again Consumerists and government agencies are your silent but greedy partners AND THEIR SHARE COMES FIRST even if you don t make a profit WELL YOU DON T HAVE TO FACE THEM BY YOURSELF JOIN NESDA 179 AND YOUR LOCAL amp m STATE ASSOCIATIONS Send for more information to c NESDA 1715 Expo Lane Indianapolis IM 46224 Write for a free booklet Economics Pueblo Colorado 81009 The American Economic System We should all learn more about it R PUCK serve message of 8 Ths Magazine amp The Advertising Cound Guna M By amp US Department of Commerce CIRCLE 24 ON FREE INFORMATION CARD CIRCLE 71 ON FREE INFORMATION CARD SPECIAL 32 FEATURE PERSONAL COMPUT 7400 TTI LINEAR P1103A ANE mm ws 7404 18 103010 35 u waqa n _ _ _ 749 19 1024X1 Dynamic 003959 Jen AND 7410 19 42C mu pod 4 7412 Eo x L CODO MSN 1M308N 95 7416 us e 2708 1 25 mro E E PUT UP TO 3426 20 D43108 1 15
18. 36 MMS375AAN 3 90 DNE FND359 CC de 170 teletype or other device are on board and if you eae 30 20508 13 MMS37SAB N 4 90 FND500 507 CCCA 500 1 35 for up to 6K of EPROM 2708 2758 2716 or II 90 04060 1 42 7205 aso TOANSIETORS need more memory there two 100 siots for LM3171VX 2 92 C04066 71 7207 9 20 2M1893 90503510 COCA 500 _ 90 2716 and is fully socketed EPROM can be used LM318 135 04068 40 50 2 2222 1B 17408005807 CCCA 800 2 20 for Hib manra Pn static RAM video boards A Godbout 8K RAM CM 320K 5 150 C04069 36 9 2M2369 30 3 digt Bubble 60 y POSES board is available for 135 00 Also a 1K Super s NE 40 DS0026CN Mus NE Super ROM Monitor 19 95 is available Monitor version 2 with video driver for full capa M32065 160 CD4072 25 2N3053 amer s an on board option 2708 EPROM which has bility display with Tiny Basic and a video interface 150 C04075 2 MICROPROCESSOR 243613 5 NSN69 9 dig display 60 been preprogrammed with a program loader board Parallel I 0 Ports 9 85 AS 232 4 50 eo DE 2856 editor and error checking multi file cassette 20 ma I F 1 95 5 100 4 50 50 pin 1 15 C04081 21 80808 wah data 895 213055 59 COMPUTER GRADE CAPS read write software relocatible cassette file connector set with ribbon cable is available at LM3404 5 18 04116 iy BDA 19 79 2N4401
19. 306 3 X 16 48 9 words The next three lines represent the response to that command The first four columns display the starting address for each line followed by 16 words grouped by two s The last byte on the 0000 line is the AF that I inserted at address 000F on line 4 Note the format that the machine uses to output memory contents The first two lines begin with addresses and end with semicolons and the third line starts with an address 0020 and ends with a carriage return This allows the data to be stored on tape in this format and then later be read back in using the compatible M command The next group of lines demonstrate a mem ory dump of 10 16 9 words starting at 0020 The monitor program uses a 32 byte RAM starting at 8COO to store the 16 scratch pad microprocessor registers This feature is helpful in troubleshooting but care must be used since certain registers are modified by the system The program cannot be restarted from an intermediate point after being interrupted by inserting an idle instruction unless the registers are restored The next three lines in Fig 1 show how the register RAM is printed out with the 2 8 20 command Characters and R7 are displayed on the line prefixed by 8 00 and R8 through RF on the line starting with 8C10 Command P starts program execution If no address is given execution begins wherever the program counter is set usually at 0000 A
20. 5575 340K 12 15 MINIATURE TOGGLE SWITCHES FCS 8024 DL 704 3 75 HM 309K S 1 10 or 24 V 1 10 106 SPDT S 95 8 display 5 95 DL 747 6 150 423 550 3407 5 6 8 12 MT A 206 DPDT S 170 Q dbi 8 5 gt HP3400 8 CC 51 95 320T 15 18 24V5 1 10 MI gt 206 1 85 85 405 8 1 95 5 12 15 V MC 1 MSD 206 P DPDT CENTER OFF E DL 704 3 C C 5 85 05 130 1 MG p LEVER SwITCH 5 1 85 2 Terms FOB Cambridge Mass Send 256 for our catalog featurin 50 LI STATE SA LES WE SHIP OVER 95 a ee Las Order Transistors and Rectifiers P O BOX 740 OF OUR ORDERS THE lt nc 1s 00 7 2000 145 Hampshire 51 Cambridge Mass gt gt DAY WE RECEIVE THEM Order 5 00 00 SOMERVILLE MASS 02143 TEL 617 547 7053 100 CIRCLE 9 FREE INFORMATION _ TEST INSTRUMENTS HICKOK Oscilloscopes New Digital 30 MHz Dual UM Mini Multimeter 845 75 Lowest 15 MHz Dual Trace MODEL 517 Price Reg 695 00 MODEL LX303 Our Price 590 00 incl probes e Big 1 2 high LCD ea or out 15 MHz F pi Triggered Sweep im s Bei e 200 hour 9V battery life e Auto zero Polarity MODEL 515 Reg 5495 00 Indication 425 75 incl probes e 100 mV DC F S sensitivity e 19 ranges and functions Befor
21. I s less EPROMS rts QMB 8 MOTHER BOARD Short Version of 30 95 WAMECO INC FDC 1 FLOPPY CONTROLLER BOARD will Baud rate is continuously adjustable from O to 30 000 e Plugs into any peripheral connector e Low current drain RS 232 input and output e On board switch selectable 5 to B data bits 1 or 2 stop bits and parity or no parity either odd or even e Jumper selectable address e SOFTWARE e Input and Output routine from monitor or BASIC to teletype or other serial printer e Program for using an Apple II for a video or an intelligent terminal Also can output in correspondence code to interface with some selectrics e Also watches DTR e Board only 15 00 Part No 2 with parts 42 00 Part No 2A assembled 62 00 Part No 2C 8K EPROM piceon Saves programs on PROM permanently until erased via UV light up to bytes Programs may be directly run from the program saver such as fixed routines or assemblers e 5 100 bus compatible e Room for 8K bytes of EPROM non volatile memory 2708 s e On board PROM programming 9 Address relocation of each 4K of memory to any 4K boundary within 64K Power on jump and reset jump option for turnkey systems and computers without a front pane e Program saver software available e Solder mask both sides e Full silkscreen for easy assembly Program saver software in 1 2708 EPROM 25 Bare board 35 including custom coil board with parts
22. t5 Jel 1 1 12 1 4 1 5 Sporla uo around ire M prope Crystal clear reception For complete n Ormatign Sources and design information send 7 95 dic ARE n A A SPACECOAST RESEARCH 16 17 18 49 20 Dept 442 Altamonte Springs FL 32701 21 22 23 24 25 The Original FCC Tests Answers exam manual that prepares you t home for FCC First and 26 27 28 29 30 Second class Radiotelephone licenses Newly revised multiple choice exams cover all areas tested on the actual FCC exam Plus Seif Study Ability Test Proven 9 95 postpaid _ Moneyback Guarantee 31 32 33 34 35 COMMAND PRODUCTIONS Box 26348 Radio Engineering Division Francisco CA 94126 1 0 e Can input into basic e Can use LLIST and LPRINT to output or output continuously e RS 232 compatible e Can be used with or without the expansion bus e On board switch selectable baud rates of 110 150 300 600 1200 2400 parity or no parity odd or even 5 to 8 data bits and 1 or 2 stop bits O T R line e Requires 5 12 e Board only 19 95 Part No 8010 with parts 59 95 Part 8010A assembled 79 85 Part No BO10 C No connectors pro vided see below EIA RS 232 con nector Part DB25P 6 00 with 9 conductor No
23. 25 T a J mbbon cable with attached nectors to fit TRS uus and our serial board 19 95 Part No 3C A840 RS 232 TTL INTERFACE e Converts TTL to RS 232 andconverts RS 232 to TTL e Two sep go to a 10 pin gold plated edge connector e Board only 4 50 Part No 232 with 232A 10 Pin edge connector 3 00 Part To Order TRS 80 5 cabe 10 95 Part ANT arate circuits e Re quires 12 and 12 volts e All connections parts 7 00 Part No S 100 BUS ACTIVE TERMINATOR Board only 14 95 Part No 900 with parts 24 95 Part No SOOA MODEM H Type 1039 Full or half duplex 9 Works up to 300 baud 9 Origi nate or Answer coils only low cost components 9 TTL in put and output serial Connect 8 N speak er and crystal mic directly to board ulator Requires 5 volts 9 Board only 7 60 Part No 109 with parts 27 50 Part No 109A VERBATIM MINIDISK Box of 10 29 95 INTERFACE e Converts RS 232 to and 2 current loop to RS 232 e Two sep quires 12 and 12 volts Board only 4 50 Part No 600 with parts 7 00 Part No 600A PART WO 692 APPLE 115 SERIAL 1 0 INTERFACE Uses XR FSK demod RS 232 TTY 20mA current loop arate circuits e Re EPM 2 2708 EPROM card PCBD
24. WORKBOOK TEXT availatie AFULLY ASSEMBLED and TESTED microcomputer A COMPLETE SYSTEM with Keyboard Display Audio Cassette Interface and Power Supply m Based on the 8080A MICROPROCESSOR m Designed to TEACH microcomputer software and hardware from funda mentals through advanced concepts m EXPANDABLE optional S 100 Bus Interconnect Board permits easy addition of CRT s printers floppy disks and other peripherals English or French ime F wx About Integrated Computer Systems Founded in 1974 by professionals in engineering anc applied computer sciences our company objective is to provide advanced technical education of tne highest quality both through intensive short courses public and private and self study programs Our educational services are available throughout North America and Europe in a broad range of high technology areas INTEGRATED COMPUTER SYST INC 3304 Pico Boulevard P O Box 3339 Santa Monica California 90405 USA Telephone 213 450 2060 TWX 910 343 6965 LOS ANGELES WASHINGTON D C BRUSSELS PARIS LONDON MUNICH PLEASE FILLOUT THIS Integrated Computer Systems Inc COUPON MAILTO 3304 Pico Blvd P O Eox 5339 Please send Santa Monica CA 90405 free catalog Telephone 2 1 3 450 2060 C Please send Self Study Microcomputer Software Hardware Training Course s 695 00 U S each in U S A or Canada Please contact ICSP Brussels office at 0
25. 1 25 JULY THE MAGAZINE FOR NEW IDEAS IN ELECTRONICS VIDEODISC CIRCUITRY DIGITAL THERMOMETER What s inside F and C with 0 1 resolution NEW 06 40010 AMPS R E A L SOUND LAB Deliver ultra wide response Yamaha top of the line receiver PC BOARDS SWITCHING POWER SUPPLIES How to make your own How to design your own Build this x __ _ MONITOR _ Direct readout unit t penso x PUBLICATION E Hu UL _ HOBBY CORNER P MEASUREMENT New twist for digital clocks Clue in servicing _ SERVICE CLINIC _ AUDIO TEST STATION Beware 01 intermittents x r 2 PR Suggested US resale Available at selected local distributors Its digital signal injector it thinks for itself It may look like a logic prebe but our DP 1 Digital Pulser is lot more unique This handheld circuit powered instrument is actually a miniature pulse gererator built to speed digital troubleshooting Touza it circuit and 1 automat cally senses the logic state So when you push the button out comes one perfect pulse preset to the logic fami y you re working with of the proper po arity to force state the other way the button Jown for a second and it starts injecting a 100pps pulse train With all the punch you need up t 100 mA Think wFat a help that can be when you logic circuit is doing some thing illogical And just in case you do
26. H H 74L5 2 86 Super Expansion Board with Cassette Interface 89 95 71 8190 106 604023 uu aq ae gt 74L5221M 195 604024 75 5311 160 KEYBOARD ENCODERS 12 250 ma wail plug 2 95 This is truly an astounding value This board has Improvements and revisions are easily done with Le B 21 MM5312 4 80 AY5 2376 12 50 12V 250 ma walt 3 50 been designed to allow you to decide how you the monitor If you have the Super Expansion C04027 um UM s 8 y Zamo wapu 485 want it optioned The Super Expansion Board Board and Super Monitor the monitor is up and OE o MM5315 400 740923 550 12V 6 amp 12 95 comes with 4K of low power RAM fully address running at the push of a button ea E Bo a MV53 aqe ub 270 2 90 able anywhere in 64K with built in memory other on board options include Parallel Input CA3082 196 CD4040 MO Me Mu im tect and a cassette interface Provisions have ang Output Ports with full handshake They 35 604043 m 8 a X 4 d been made for all other options on the Same low easy connection of an ASCII ke board to the n 87 CD4044 63 CI7002 0 95 e 6MCC 500 19 board and it fits neatly into the hardwood cabinet input sn RS 232 and 20 ma Asien Loop for LM308N 835 Keyer 8043 1450 01747750 600 1 95 c s C alongside the Super The board includes 51015
27. MPS3638A 5 1 00 2N4401 21 00 MPS3702 5 1 00 284402 411 00 2N3704 5 100 2N4403 5 1 00 MPS3704 5 1 00 2N4409 PN2222 Plastic 7 1 00 2N3705 5 100 25086 5 1 00 MPS3705 5 1 00 2 5087 4 1 00 2N3706 5 1 00 2N5088 5 1 00 53706 5 1 00 2N5089 4100 2N3707 5 1 00 2N5129 41 00 2N3711 5 1 00 5134 5 1 00 2N3724 65 PN5138 PN2907 Plastic 7 1 00 2N3725A 1 00 2N5139 5 1 00 2M3772 225 2N5210 1 25 203823 1 00 2 1 00 CITOR 50 VOLT CERAMIC CORNER DISC CAPACITORS 100 1 9 10 99 03 001 05 4 05 03 0047 0 04 05 63 01 05 04 05 003 0224F 0 amp 05 05 04 03 047 pF 05 05 04 035 12 09 190 VOLT MYLAR FILM CAPACITORS 2 10 07 022m 3 f 42 10 07 047m 21 17 2 0 0 1mt 27 23 2 10 07 22ml 3 27 20 OIPPCD TANTALUMS SOLID CAPACITCRS 28 23 17 15 35V 30 26 28 23 17 2 2 25N 31 27 28 2 17 3 3 25V 3 27 28 23 17 4 7 25V 32 28 28 2 17 6 25V 36 3 28 23 17 10 25 40 35 28 22 17 15 25V 63 50 MINIATURE ALUMINUM ELECTRDLYTIC CAPACITORS Lead Radial Lead 5 3 10 47 25V 15 13 16 14 11 47 50V 16 14 4 2 09 1 0 16V 15 13 15 13 10 1 0 25V 16 14 15 13 10 1 0 50V 16 14 16 14 12 47 16V 15 13 17 15 32 4 7 25 15 13 24 2 8 4 7 50 16 14 19 7 15 10 16V 4 12 25 21 19 10 25V 15 13 24 20 18 10 50V 16 14 35 3 2 47 50v 24 21 32 28 25 100 16V 19 15 45 4 38 100 25V 24 20 3 2 27 t00 50V 35 30 55 50 45 220 16V 2 17 28
28. the market today that has all the desirable bene and low address There is a 44 pin standard 74150M 95 NE555V 0 885 2 fits of the Super Elf for so little money The Super connector for PC cards and a 50 pin connector for ntm D EUM LU ssp jumbo Red 20 15 a small single board computer that does the Quest Super Expansion Board Power supply 74157M 150 809 95 70 iia LED Mounting clipe 85125 many big things It is an excellent computer for sockets for ali IC s are included in the price 74162M 87 5708 500 8098 95 specify red amber green yellow clear training and for learning programming with its plus a detailed 127 pg instruction manual which aren M 9 w a bas machine language and yet it is easily expanded now includes over 40 pgs cf software info in 74175N 0 78108 60 8113 3 00 N82523 295 M X 100 8 digit Freq 128 95 PM 74190N 115 79L95 70 8720 450 N825123 3 50 OK WIRE WRAP TOOLS In stock with additional memory Tiny Basic ASCII cluding a series of lessons to help get you started 14190 7805 85 8123 3 10 825126 375 Portable Multimeter 18 00 Keyboards video character generation etc and a music program and graphics target game 74221N d we 1 73 82 12 Mi 17 DIGITAL THERMOMETER 548 50 7429BN 1 7 att oper The Super Elf includes ROM monitor for pro Remember other computers only offer Super Hoon 9 75494CN
29. 1 IB15 VOLT REG 1A 15V 69 amp BATTERY EASY TO ASSEMBLE 725 LOW NOISE OP AMP 99 AE a IL 1 ISOLATOR MINI DIP 60 INCLUDED EXTRA QU MEM 631 DUAL GATE MOSFET INCLUDED EXTRA DRILLEO amp PLATED PC BOARDS DIDDE PROTECTED SIMILAR i 40673 50 COMPLETE KIT OTHERS WILL SELL YOU THE CHIP BUT ONLY BULLET 16 95 ae CAN FURNISH YOU A COMPLETE KIT OF ALL THE PARTS 4 TIP30 TAB PNP POWER 3 1 00 YOU TO PUT THE T I 76477 SOUND CHIP MC1351P FM IF DISC IC 50 THROUGH ITS PACES WE INCLUOE SPECS ULTRASONIC RELAY KIT 4 ES ITEM IS HOUSE NUMBEREO PROGRAMMING CHARTS YOU WILL BE AMAZED AT THE INVISIBLE BEAM WORKS LIKE A PHOTO THOUSANDS OF SOUND EFFECTS YOU PROOUCE gt ELECTRIC EYE USE UP TO 25 FT APART LED S WITH OUR KIT MAKE PHASOR GUN STEAM TRAIN COMPLETE KIT ALL PARTS gt mich GUNSHOT OTHER SOUNDS BOARD HAS AUXILLARY 8 BOARDS 7 80 PULSE GENERATOR COMPARATOR MULTIPLEX OSC 21 50 MEDIUM REO 15 FOR EVEN MORE VERSATILITY MEDIUM GRN OR YELLOW 18 gor THREE ELEMENT 120VAC CORNING HOT PLATE 1 8 TEXTURED GLASS SURFACE RATED AT 120 WATTS BUILT IN THERMOSTAT A THERMIONIC UNIQUEITY at bargain price Brand new top quality multi purpose hotplate generates up to 150 C from three 3 dia circular elements
30. 2 25 2 49 2 49 2 50 2 49 2 49 2 49 5 95 6 25 8 95 8 95 1 50 1 50 79 39 55 1 00 1 19 35 39 79 39 295 59 1 39 139 95 1 75 3 00 1 95 2 95 t 50 1 49 LM3900N 3401 49 LM3905N LM3909N MC5558V 8038B LM 75450N 5451CN 754520N 75453CN 75454CN 5491CN 75492CN 75493N 75494CN RC4136 RC4151 RC4194 RC4195 7415138 7415139 741 151 7415155 7415157 7415160 7415161 7415162 74 5163 74151864 7405175 7415181 7415190 7415191 74 8192 74 8193 74L8194 7418195 7415253 7415257 7415258 7415260 7415279 74LS367 7415358 7415670 89 XC556R TYPE MAN 1 MAN 2 MAN 3 MAN 4 MAN 76 MAN 7V MAN 72 74 MAN 82 MAN 84 MAN 3620 3630 MAN 3640 MAN 4610 MAN 4640 MAN 4710 MAN 4730 MAN 4740 MAN 4B10 MAN 4840 MAN 6610 MAN 6630 MAN 6640 MAN 6650 MAN 6660 MAN 6680 MAN 6710 CA3013T CA2023T CA3035T CA3039T CA3046N CA3059N CA3060N CA3080T CA3081N _ JE600 HEXADECIMAL ENCODER KIT JE600 DISCRETE LEDS 200 dia red XC556G green XC556Y yellow 5 1 FEATURES e Full 8 bit latched output for micro processor use stable operatio keys 1C connector n e 3 User Define keys with one being bi Debounce Circuit provided tor all 19 e LED readout to verify entries Easy interfacing with standard 16 pin e Oniy 5VDC
31. Oscilloscope Delayed Sweep Sweep delay continuously variable from 1 uSec to 5 Sec 5 mV Div Vertical Sensitivity with 3 acc Rectangular CRT with internal graticule 14 5 rise time CH 1 or 2 trigger HF filter and TV sync 10 000 MQ resistance meas with conductance function Extensive overload and transient protection Rugged construction MIL T 28800 Hi Lo power ohms for in circuit resistance and diode testing 10 MQ input impedance doesn t load circuit 200 hour battery life low battery indicator Large LCD readout 2000 counts 1 year calibration cycle only 3 adjustments One hand operation our price 129 Large 3 Digit LCD s view in any light Conductance function resistance to 10 000 MQ AC measurements to 50 kHz and higher True RMS for ac accuracy Touch Hold probe for tricky places Y8008 Diode test and low power ohms One year accuracy reduces calibration costs COMMON floatable to 500V LIST PRICE 1395 OUR PRICE 51180 8010A Recessed jacks reduce shock hazard Current mode fuse protection to 600V The 20 MHz Dual Trace OUR PRICE s239 Voltage mode transient protection to 6 kV Oscilloscope Autozero and autopolarity P 8012A AC or dc current to 10 amps with 8010A Add 8 subtract modes with CH 2 invert Front panel X Y operation 17 5 nanosec rise time Automat
32. RADIO ELECTRONICS oS If youre going tolearn electronics you might as well learn it right Dont settle for less Especially when it comes to career training because _ everything else in your life may depend on tt That s why you ought to pick CIE probably seen ad vertisements from other electronics schools Maybe you think they re all the same They re not CIE is the largest indepen dent home study school in the world that specializes exclu sively in electronics Meet the Electronics Specialists When you pick an electronics school you re getting ready to invest some time and money And your whole future depends on the educa tion you get in return That s why it makes so much sense to go with number onc with the specialists with CIE There s no such thing as bargain education If you talked with some of our graduates chances are you d find a lot ofthem shopped around for their training Not for the lowest priced but for the best They pretty much knew what was available when they picked CIE as number one We don t promise you the moon We do promise you a proven way to build valuable career skills The CIE faculty and staff are dedicated to that When you graduate your di ploma shows employers you know what you re about Today it s pretty hard to put a price on that Because we re special ists we have to stay ahead At CIE we ve got a p
33. Sim walnut case AC wall adapter Size 3 1 4 Hx6 5 8 Wx 1 3 8 JE300 939 95 sContin Range 5 1 4 1 4 51 5 51 4 1 4 1 4 81 5 1 4 51 4151 4 51 wal 6730 MAN 6740 MAN 6750 MAN 6760 MAN 6780 01701 01704 01707 01728 01741 01746 06747 06749 01750 DL33B FND70 FND358 FND359 FND503 FND507 5082 7730 HDSP 3400 HDSP 3403 5082 7300 5082 7302 5082 7304 5082 7340 2 95 2 95 2 00 1 00 75 75 uous LED TIMEX T1001 CRYSTAL DISPLAY CLASS 1 FIELD EFFECT 4 DIGIT 5 CHARACTERS THREE ENUNCIATORS 2 00 X 1 20 PACKAGE INCLUDES CONNECTOR T1001 Transmissive 7 95 T1001A Reflective 8 25 HT PRICE POLARITY Common Anode red 1 560 99 Common Cathode red D 0 550 99 Common Cathode red gt 1 560 99 Common Anode red 560 99 Common Cathode red 560 99 Common 1 300 99 Common Cathode red 300 99 Common Anode red 300 99 Common Cathode rad 500 1 49 Anode red 600 125 Common Anode red 1 630 149 Common Anode red 800 149 Common Cathode red 1 630 149 Common Cathode red 600 1 49 Common Cathode red 110 35 Common Cathode 250 69 Common Cathode 1 357 9g Common Cathode 357 25 Common Cathode FNDS00 500 99 Common Anode FND510 500 99 300 1 30 Common Anode red B00 210 Common Cathode red 800 2 10 4 7 sgl Digit
34. _ _ 18 21 Command Productions 90 26 Computer Components 98 16 amp 29 Continental Specialties Cov 2 amp 67 Dage Scientific 98 41 Davis Electronics 84 11 Delta Electronics 92 3 104 Digital Research Corporation 96 54 Electra Company 13 Electronic Development Lab 92 E M C Electronic Measurements 76 36 Electronic Supermarket 100 Electronic 91 ____ gt _ 69 38 Fordham Radio Supply 101 Forest Belt s Training Workshop 81 12 amp 13 Formula International 94 95 u 107 General Electric waqasa 34 63 Godbout Electronics 110 47 Gould Inc Instruments Div 86 64 Grantham College of Engineering 78 100 7 gt 3 _ 70 73 48 Hickok Electrical Instruments 33 3 Hobby World 110 33 ITC Electronic Supermarket 96 Information Unlimited 92 67 Integrated Computer Systems 75 58 International Crystal Mfg Co
35. at 1 5 amps e Board only 12 50 Part No 6085 with parts excluding transformers 42 50 Part 6085A Circuits designed by John Bell 6 6L SPEAKER INFORMATION KIT Get 70 pages of speaker facts specs construction tips plus info on our raw speakers crossovers and a line of 9 quality hi fi speaker system kits We ll send you our full color catalog plus How to Hook Up Your System an exhaustive step by step treatise on hi fi system installation and our Speaker Operating Manual chock full of facts on how to get the most from any speaker system for Free Even if you don t buy from us we want you to have the facts That s how we got to be the vworld s largest manufac turer of speaker kits Send to Speakerlab Dept 7 735 N Northlake Seattle WA 98103 Delta Burglar Deha No 6118 Complete 42 Featured in April Radio Electronics and Popular Mechanics Magazines Elementary Electronics Too DELTA MOTION DETECTOR This device detecta any motion or movement for a minimum distance of 8 ft The secret ia in the ultra complex custom LSI chi 1 linear amp digital circuitry contained in a case 6 x 3 x 2 and operates from four AA NiCad batteries Nothing else is needed for the deviceto perform ita basic function motion detection When motion or movement is detected a whoop alarm 18 sounded The MOTION DETECTOR is designed to prov
36. phasis is on optimum input coupling for the phono cartridge and optimum output coupling to the loudspeakers Amplifiers from different manufacturers using this approach show variations which may re sult from different views regarding sound quality physical performance and cost vs performance considerations For example the Onkyo model A 708 and model A 705 use an equalizer circuit that is divided into two sections as shown in Fig 5 A negative feedback circuit is used for equalizing low frequencies while an R C circuit is used to rolloff the high frequencies in accordance with RIAA equalization requirements In the Yamaha model 1 power amplifier gain is increased during the record playing and the input capacitor less DC designed equalizer is directly coupled to the power section as shown by the dotted lines in Fig 4 4 In this instance only one coupling capacitor 15 introduced into the signal path On the other hand when the tone control ampli fier is introduced into the circuit the signals pass through a capacitor coupled tone control section In the case of Sony s variation of this design as presented in their model TA F6B when the DC equalizer is used the amount of feedback in the DC range 15 partially restricted to obtain additional stability A small value capacitor remains in the negative feedback loop This de sign is often referred to as a DC feed back type Similarly in the case of JV
37. think that Stereo Review failed to give the correct informa tion by publishing the test results of the receiver the tuner circuits of which were not correctly adjusted Radio Electronics published its results several months earlier from which Stereo Review could have no ticed there was something wrong with its test results Nobody has commented on this matter neither the readers nor the magazine s editorial staff to date Returning to the question of what is best and most useful for the consumer it is clear that such a discrepancy between the tests of the same product is nothing but confus ing Anyone can find somewhat similar case by comparing the test reports of the Harman Kardon Citation 16 published in both magazines The problems associated with modern FM tuner measurements are not unknown to me The quality of tuners seems to outperform their test equipment to a great er and greater extent One such aspect is the measurement of the channel separa tion assume that in both tests the Sound Technology mode 1000A stereo signal generator was used for the channel sepa ration measurement This fine equipment however is claimed to give a separation of 50 dB from 50 Hz to 8 kHz so a separation of 60 dB at 100 Hz achieved by the Luxman model R 1120 receiver should be very near the limit of the test signal itself THE BENCH TYPE DMM S FROM SOAR THEY FIT YOUR BUDGET AND ALL OF RADIO ELECTR
38. 1979 1980 line since increasing speaker efficiencies are prompting consumers to select lower powered receivers as central components of their stereo systems Because the model CR 2040is the flagship of Yamaha s new receiver line they have spared no effort in equipping it with every imaginable feature At its suggested retail price the new Yamaha receiver performs as well or better than many of last year s models including their own that retail for as much or even more The model CR 2040 is as close to a dream receiver as the high fi industry has achieved to date I IM id r a ww TL k t 4 SLE w F F High cut filter response is shown in Fig 10 in which three traces in addition to flat response are shown since both filter pushbut tons can be depressed either simultaneously or individually Figure 11 shows overall frequency response as the separate loudness control is varied over its entire range approximately 20 dB Note that this variation in loudness level and tonal response is achieved without changing the master volume control setting Summary Table 3 contains an overall product evalua tion along with our summary comments re garding the listening and handling qualities Yamaha obviously believes that today those who purchase a higher powered receiver are no longer casual listeners but require every bit as much flexibility and versatility in an integrated componen
39. 3 45 2240 VOLTS W 12 1 00 1M1188 15A 400V SCR 2N1849 35A i 600 SCR 1 64 300 SCR 12 50V FW BRIDGE REC 12A 200v FW BRIDGE REC 70 62 55 470 25V 31 M 76477 SOUND GENERATDA Generates Sounds Low Power Programmable 3 95 each 7 95 set 4741 400 PIV 35 AMP SCR AND FW BRIDGE RECTIFIERS AY 5 9100 a Button Telephone Dialler 14 95 AY 5 9200 epertory Dialler 14 95 AY 5 9500 MOS Clock Generator 4 95 AY 5 2376 Encoder 88 keys 14 95 HD0165 Keyboard Encoder 16 keys 7 95 740922 Keyboard Encoder 16 keys 5 95 ICM CHIPS ICM7045 CMOS Precision Timer 24 95 ICM7205 CMOS LED Stopwatch Timer 19 95 ICM7207 Osciltator Controller 7 50 ICM7208 Seven Decade Counter 19 95 ICM7208 Clock Generator 6 95 NMOS REAO ONLY MEMORIES MCM6571 128 X 9 X 7 5CII Shifted with Greek 13 50 MCM6574 128 X 9 X 7 Math Symbol Pictures 13 50 MCM6575 128 X 9 X 7 Alphanumeric Control 13 50 Character Generator MISCELLANEOUS TLO74CN Quad Low Noise bi fet Op Amp 2 49 TL494CN Switching Regulator 4 49 TL496CP Single Switching Regulator 1 75 11690 Divide 10 1 Prescaler 19 95 95H90 Hi Speed Divide 10 11 Prescaler 11 95 4N33 Photo Darlington Opto Isolatar 3 95 MK50240 Octave Freq Generator 17 50 DS0026CH hz 2 phase MOS clock driver 3 75 TIL308 27 red num display w integ logic chip 10 50 MM5320 TV Camera Sync Generator 14 95 MM5330 4
40. Direct Memory Access DMA Channel 7 Audio Cassette Interface for Easy Program Storage and Retrieval 8 On Board 8 Digit LED Display 9 On Board Keyboard for Program and Data Entry 10 Space for User s Hardware Additions 11 Power Supply with Capacity for Off the Board Devices as Well Expandable using the optional 5 100 Bus Interconnect Board the Microcomputer Training System permits interfacing with a variety of RAM and PROM memory modules CRT terminals TV monitors printers floppy disks and other peripheral devices With an expanded system you may add disk operating systems text editors and assemblers and high level languages such as BASIC PASCAL and PL M Advanced Training available with the Self Study Microcomputer Interface Training Course which builds on the material of the Microcomputer Software Hardware Training Course to develop advanced Input Output techniques and applications for process control and other types of real time microcomputer controlled operations CIRCLE 67 ON FREE INFORMATION CARD This Self Study course is designed for people who really need to know how microcomputers work at the fundamental detailed hardware software level The course has been delivered to thou sands of professional engineers and scientists at organizations such as Bell Labs DEC GE GM IBM and Xerox and to hundreds of serious amateurs as well What this training course is m A detailed 750
41. Granular Finish Corning glass promotes the most even thermal distribution Neon safety lamp is trig gered by the built in thermostat add glows 7 orange thru the glass as a reminder that the unit is on THE APPLICATION list is so numerous that we leave it up to you and your imagination Cat No 102 RE Wt 1 Ib Price 3 95 THERE is now a better way to measure or monitor mechanical motion with magnetically activated HALL EFFECT integrated circuits Available exclusively at Tek El The unique device is actually a non mechanical digital switch mounted in a TO 92 style package APPLICATIONS unlimited and security devices etc Sup plied with app notes and spec sheets Cat No 100 RE Wt 1 oz Price 1 49 10 for 12 00 RADIO ELECTRONICS 350 mf 330v 100 9 720 mt 360v 150 1 1600 mf 360V 2 25 J 23778 STROBE TUBEASST Hichiy POLISHED Brand new fac REFLECTOR FOR STROBE TUBES tory prime 073200 wi hamata 3 00 E Y a CHANEY Visa and COD accepted electronics Phone orders are weicome BOX 27038 DENVER 80227 Ph 303 7815750 Send for our FREE GIANT CATALOG of unique tems C23451 2 49 Write for details on how you can gain great benefits and participate in the destinies of this great C00 5 MAY BE TERMS Add Postage
42. Period Meas Stability Digits 520MHz Resol AC DC You ll choose B amp K PRECISION FEATURES TCXO time base Internal time base output on rear panel Period measure ment from 5Hz to 1MHz Leading zero suppression Handle tilt stand adjusts to four viewing angles or folds behind the case Bright 0 43 tall LED readout No warm up time required Covers all major land mobile bands including the new T band Operates on 117 or 234VAC or 12VDC Well protected input circuitry Available for immediate delivery at your local distributor DAK PRECISION DYNASCAN CORPORATION 6460 West Cortland Street Chicago Illinois 60635 312 889 9087 in Canada Atlas Electronics Ontario Intl Sis Empire Exporters Inc 270 Newtown Road Plainview L I NY 11803 CIRCLE 57 ON FREE INFORMATION CARD HEART RATE MONITOR continued from page 38 convenient means of grounding your fin ger to circuit ground This is accom plished by connecting a short bare wire to pins 2 and 4 bending it around and pushing it into the conductive foam after it has been glued to the perforated board This ground connection will considerably reduce the capacitive coupling of AC hum into the sensor assembly Now attach some self stick Velcro material as shown in Fig 7 with silicone adhesive and allow to dry thoroughly If you use a 4 4 inch meter as sug gested
43. RATED Net 30 PHONE 617 631 7434 9 00 A M to 4 30 P M MINIMUM ORDER 10 Mastercharge and Visa accepted When ordering always use catalog number industry type no the name of the magazine you are ordering from and the month E an TEK EL Corp NATESA Box 761R 5908 South Troy Street 25 Marblehead Mass Chicago Illinois 60629 01945 CIRCLE 70 ON FREE INFORMATION CARD CIRCLE 40 ON FREE INFORMATION CARD AVAILABLE NOW Ooxvvss9s Add 1 00 for shipping JAPANESE TRANSISTOR SUBSTITUTION MANUAL An onvalucble japanese to joponese subsurun n guide for approxmarety 3000 transistors Covers ZA 250 2 and 250 series includes guide understanding Japanese 90 8 PARTS PROCUREMENT PROBLEMS FUJI SVEA Has the Largest Inventory of Original Japanese Parts Anywhere by 11 sot Seekinq Oriqinal Japanese Replacement Parts for CB aver book TV and Stereo Repair Use TYPE 25 UP 10 24 1 9 TYPE 25 UP 10 24 1 9 TYPE 25 UP 10 24 1 9 TYPE 25 UP 10 24 1 9 TYPE 25 UP 10 24 1 9 2SA 473 45 55 60 2SB 346 30 35 40 2SC 693F 20 27 30 2SC 1226A 50 55 60 2SD 234 60 70 80 254 483 200 2 20 2 50 258 367 110 125 1 40 2SC 696 100 120 1 30 25C 1237 1 80 200 225 250 235 60 70 80 25 484 150 175 195 258 3688 180 200 225 25C 708 130 145 160 25C 1239 220 270 290 250 261 35 40 45 2SA 485 140 1 60 1 80 258 379 70 80 90 2SC 710 20 27 30 2SC 1279 50 55 60 250 287 250 27
44. Tri Star Corporation Phone 303 243 5200 P O Box 1727 Grand Junction Colorado 81501 RADIO ELECTRONICS delivery include 41 in stamps CIRCLE 63 ON FREE INFORMATION CARD This Month s SPECIALS Cat No Description Price 1292 1147 1142 1979 IC MASTER with updales Shae 35 00 VERBATIM DISKETTES TRS 80 Apple box of 10 for 27 00 DATA CASSETTES C 10 leaderless 10 for 17 00 KR2376 ST KEYBOARD ENCODER ROM ASCI 9 50 1340 76477 1358 TRANSIENT EMI FILTER 20Amp Corcom 2081 6 00 COMPLEX SOUND GENERATOR iC 2 75 10 x 18 COPPER CLAD PC two sided 1 oz 3 00 1150 14 3 14 31818 MHz CRYSTAL 4x color burst 2 00 1233 1339 1156 1007 1226 1117 1117 1289 1290 1291 1224 1167 1337 1378 1387 1139 1140 1150 18 1150 24 SWITCHING DIODES 1N4148 factory prime20 for 1 00 TRANSFORMER 9V with 15V 4A 53 00 MEMORY ADD ON for TRS 80 Apple 565 00 12V 300mA TRANSFORMER PC leads 75 LINE CORDS 6 ft 18 with molded plug 4 for 1 00 14 PIN IC SOCKETS soldertail 6 for 1 00 16 PIN IC SOCKETS soidertail 5 for 1 00 4 POS DIP SWITCH 7 POS DIP SWITCH 8 POS DIP SWITCH SOUND ACTIVATED SWITCH vox 40 CONDUCTOR RIBBON CABLE 10 Ft 5 00 MINI NIXIE TUBES Burroughs 85853 51 2 for 1 00 AC RECEPTACLE 2 prong chassis mt 4 for 1 00 AC RECEPTACLE w GND 3 prong chassis mt 2 for 1 00 2N3904 TRAN
45. advance in literary clarity the computer field You don t have to be a computer engineer in order to understand it Keyed to ELF II it s loaded with hands on illustrations When you re finished with the Short Course neither ELF II nor the RCA 1802 will hold any mysteries for you In fact not only will you now be able to use a personal compuler creatively you ll also be able to read magazines such as BYTE INTERFACE AGE POPU LAR ELECTRONICS and PERSONAL COMPUTING and fully uaderstand the articles And you ll understand how 10 expand ELF II to give you the exact capabilities you need II you work with large computers ELF II and the Short Course will help you understand what they re doing Get Started For Just 99 95 Complete 99 95 ELF II includes all the hardware and software you need to start writing and funning programs at home displaying graphics on your TV screen and designing circuits using a microprocessor very first night even il you ve never used a computer before ELF II connects directly to the video input of your TV set without any addi tional hardware Or with an 8 39 RF modulator isee coupon below you can connect ELF li to your TV s antenna terminals instead ELF II has been designed to play all the video games you want including tascinating new targetimisse gun game that was developed specifically for ELF But games are only the cing on the cake The real value of ELF II is that i
46. amp case masa LI 89 9 required to fire xenon flash tubes PHOTOFLASH CAPS Now more than ever who KNOW say 5 THE ANSWER HELP NATESA HELP YOU BY DOING YOUR PART Are YOU the operator of an ethical professional caliber tv radio home electronics service business we 7 WATT AUDIO AMP KIT NO CDD S SE 01 SOUND EFFECTS KIT e SEND CHECK OR VISA SMALL SINGLE HYBRID IC AND ADD 5 FOR COMPONENTS FIT ON A 2 x 3 PC E BOARD INCLUDED RUNS ON 12 VOC TALOG FREE UPON REQUEST GREAT PROJECT THAT NEEDS CADERAS UNDER 10 gt COMPLETE gt INEXPENSIVE AMP LESS THAN 3 RESIDENTS ADD INSTRUCTIONS THD 5 WATTS COMPATIBLE WITH gt 9 SALES TAX e QUALITY PLATEO cesses oes amp DRILLEO BOARD 5 95 ARTS 301 OP AMP LEAD CAN 3 1 00 IC SPECS INCLUDED 723 VOLT REG 10 LEAO CAN 50 Piu OR DIGIT AUTO VAN CLOCK 13741 FET INPUT 741 MINI 3 1 10 Fog 30 000 15V COMPUTER GRADE 2 10 VOLT BATTERY e LARGE V CHARACTERS LED GEN PURPOSE 8 1 00 gt _ e QUARTZ XTAL TIMEBASE 2N4402 PNP COMPLIMENT 8 1 00 Mud D 2 6028 W SPECS 50 1 6 95 ALARM amp SNOOZE OPTIONS LM3802W AUDIO IC W SPECS 1 09 LM377 DUAL LM380 W SPECS 2 50 LESS SPEAKER Wet ee
47. b FIG 2 CONVENTIONAL AMPLIFIER uses ca in feedback loop as shown in DC amplifier eliminates capacitor as shown in 6 stage a tone control section and a power amplifier section may have one or all of its sections designed in a DC configura tion and manufacturers would still label the product as a DC amplifier Why design a DC amplifier Amplification of direct current signals is not required in the reproduction of musical signals The purposes of de signing a DC amplifier are threefold 1 To establish a constant driving 6261 RADIO ELECTRONICS EQUALIZER AMP ROR R C NETWORK TONE CONTROL AMP POWER AMP 4 TT we FIG 3 INTEGRATED DC AMPLIFIER may still have capacitors in the signal path power versus frequency relation ship between the amplifier and its loudspeakers or between the phono cartridge and the pream plifier equalizer section over a very wide frequency range 2 To eliminate capacitors which can generate their own harmonic distortion components from all signal paths including the nega tive feedback loop as much as possible 3 To improve the waveform trans mission characteristics of the am plifier including the phase and time relationships inherent in complex signals and thereby to also reduce transient intermodu lation distortion TIM Eliminating capacitors In an integrated amplifier without out put capacitors there may stil
48. features a large bright 10cm x rectangular CRT Check this capability Versatile triggering in excess of 25MHz 2mV sensitivity differential mode and much more Quality You Bet Backed by Exclusive Gould 2 yr warranty its a winner Call us for the full story on the 05255 For free brochure call TOLL FREE NUMBER 800 325 6400 in Missouri 8 42 GOULD An Electricai Electronics Company CIRCLE 47 ON FREE INFORMATION CARD Gould inc instruments Division 3631 Perkins Ave Cleveland OH 44114 FREQUENCY COUNTERS for the FIRST TIME RECEIVE FREQUENCY ADAPTER 7208 10 Hz to 600 MHz MINI COUNTER Metal Cabinet s 8 Digit 4 LED Readout e 115V or 12V Operation 1 amp 1 Sec Gate Times e Automatic DP e Stable Crystal 1 ppm 7208 Kit 1c1 3995 7208A Assembled Options Prop Crystal Oven IOCxO 1 ppm 10 to 50 C Ni Cad Battery Built in with charger Handle VHF UHF Preamp Receive Frequency Adapter 5199 95 539 95 achieve superior frequency stability through the use of proportional control oven which maintains the crystal at a stabte temperature CALL FACTORY DIRECT 1 716 874 5848 _ TERMS Add 53 00 shinping to U S amp Canaua Other coun tries 10 to total price N Y State residents add 7 Sales tax C O D Fee 1 00 accepted rated companies DAVII DAVIS ELECTR 636 Sheridan Drive Tonawanda New York
49. of step change in temperature in stirred liquid bath Voltage standoff 200V fram sensor case to el ther active lead Cable length 10 feet be extended to several hundred feet Connector phono plug Meter Operating Temperature Range Display 0 50 dz D 43 inch high high intensity red LED digits Size H x 41 W x 5 4inches D Weight Input Power 14 oz 20 with batteries and charger 9 14 volts AC 175 mA 1 7 watts This easy to build electronic thermometer provides a resolution of 0 1 degree with unusually rapid response time Two switch selectable sensor probes can be used for accurate measurements from remote areas and 4 597 volts from the R output as shown in Fig 2 This is accomplished by having the voltmeter measure the differ ence between the scaled output voltage and the appropriate reference voltage The reference voltages must be very stable so a 6 9 volt precision integrated circuit Zener 1 7 LM329DZ is used with appropriate resistor dividers Figure 3 shows the complete temperature to voltage circuit with Celsius to Fahren heit and sensor switches Trimmer resis tors are used to calibrate the temperature sensors and to precisely adjust the refer ence voltages The selected temperature sensor s Cel sius or Fahrenheit output voltage is mea sured by a 3 digit digital voltmeter DVM The DVM has a 1 999 volt to
50. or Si SIGNAL 0100 5 SPD tVDC 200 ohm coils High quality marked i 1 amp 20 watt MC contacts Grin DIP computer grade signal WILL DRIVE A TTL GATE Long 1 1x10E 9 oper diodes Leads trimmed High speed 500 Hz WITH TEN MA LED CURRENT for pcp mounting i Hermet ice sealed jens 69 ea ten 6 e 3 8x3 8x3 4 2 956a gt dE C 9 0 SD SD O AE OSD 0 0 G e aito e o STACKPOLE B AMP snap action biah Quality Slide switch 15 8 mounting center 40 ea 3 16 TRANSISTOR BONANZA VOICE ACTUAT COMPLETELY ASSEMBLED ON CIRCUIT BOARD AS SHOWN CONTAINS CRYSTAL MICROPHONE GAIN CONTROL TRANSISTOR AMPIFTER AND 4 AMP SCR WHICH IS TURNED AUDIO FROM MICROPHOME REQUIRES 5 15 Ce u 4 PRIME 10 92 PLASTIC TRANSISTORS FROM DIODE ARRAY SEMI CONDUCTOR MANUFACTURER THESE 10 1N914 s ARE FIRST QUALITY DZVICES MADE FOR COM E M 20 ea PUTER FIRM TMt NPN s HAVE CUT AMD FORMED f pine spacen TTN 10 1 50 LEADS Tos SHAPE MO ARE FULL TWO STAGGERED ROMS 12 50 LENGTH LEADS SPECIFY NPN OR PNP 50 PER TYPE MINIMUM 25 each 10 2 25 PATOCONDUC TIE CELLS 6 for 50 L i a gt ANO G s s _ MV5054 Monsanto 2 red diffused LED with panel hdwr PRIME PARTS Not cosmetic
51. put of IC610 Set 519 to PEAK Monitor the output of IC605 with the scope It should display a full wave recti fied sinewave Adjust R620 for equal amplitude in both halves of the waveform Adjust R625 for approximately 4 volts peak Check to be sure that it is possible for each half of the waveform to reach at least 4 volts peak without clipping Increase the timebase frequency to 100 kHz while checking the rectified sine wave Some degradation of the valleys is acceptable however the peaks should not be affected Reduce R3 to O Adjust R622 for O volt at the output of IC609 Adjust R3 so the output of IC609 is exactly 4 volts peak Adjust R625 so the output of IC609 is 4 volts DC Monitor the signal at the arm of S19 Place S19 in the true RMS The DC voltage should drop to approx imately 2 8 volts Now reduce the time base frequency to around 20 Hz With S18 in the FAST position a defi nite droop should be noted when S19 is at PEAK An approximately equal amount of ripple should be noted when 519 is set returned to TRMS Placing S18 in the SLOW position should significantly reduce both the droop and the ripple Log converter The procedure for calibrating the log converter is as follows Set the timebase for a 1 kHz triangle waveform Set R3 for 4 volts P P peak to peak Set R4 to 2 volts This will produce a triangle wave between 0 and 4 volts Set S16 to EXTERNAL wi
52. 1 25 25 595 80 1 35 1 35 1 35 SN7470N 29 SN7472N 29 SN7473N SN7474N 35 SN7475N 49 SN7476N 35 SN7479N 5 00 SN7480N 50 SN7482N 99 SN7483N 59 SN7485N 79 SN74B6N 35 SN7489N 1275 SN7490N 45 SN7491N 59 SN7492N 43 SN7493N 43 SN 494N 65 SN7495N 65 SN7496N 65 SN7497N 3 00 SN74100N 89 SN74107N 35 SN74109N 59 SN74116N 1 95 SN74121N 35 SN74122N 39 SN74123N 49 SN74125N 49 SN74126N 49 SN74132N 75 SN74136N 5 SN74141N 79 54741424 2 95 SN74143N 2 95 SN74144N 2 95 SN74145N 79 SN74147N 1 95 SN74148N 1 29 SN74150N 89 SN74151N 59 5M74152M 59 SN74153N 59 SN74154N 99 SN74155N 79 SN74156N 79 SN74157N 65 C04028 604029 604030 CD4035 CD4040 604041 C04042 C04043 C04044 604046 CD4047 04048 CD4049 CD4050 CD4051 CD4053 C04056 04059 604060 604056 CD4068 04069 74000 74085 74090 74093 74095 740107 740151 740154 740157 74C160 74C161 C MOS 8 A9 99 7 19 1 49 2 49 1 95 1 95 1 95 1 25 2 90 3 00 2 15 2 49 2 49 LINEAR LM340K 18 1 35 LM340K 24 1 35 LW340T 5 1 25 LM340T 6 1 25 LM340T 8 1 25 LM340T 12 1 25 LM3401 45 1 25 LM340T 18 1 25 LM340T 24 125 LM358N 1 00 LM370N 1 95 LM373N 3 25 LM377N 4 00 LM380N 1 25 LM380CN 99 LM381N 1 78 LM382N 1 79 NE501N 8 00 NES10A 6 00 NE529A 4 95 NE531H V 3 95 NE536T 6 00 NE540L 6 00 NE544N 4 95 NESSON 1 30 M6555V 39 NE556N 99 5
53. 1 49 B 12 274 242 1 49 2 Pin Male amp Female Not shown 274 222 Pair 89 Displays red green yellow Uniform night output of 0 6 mcd Forward voltage 2 2VDC Max current 25mA T1 34 case style 276 035 1 39 S Operates directly from 5VDC power source Pulse rate 3 current 20 at 5VDC 276 036 1 29 WHY WAIT FOR MAIL ORDER DELIVERY o i _IN STOCK NOW AT OUR STORE NEAR YOU ad 1 haek Prices may vary at individual stores and dealers A DIVISION OF TANDY CORPORATION FORT WORTH TEXAS 76102 OVER 7000 LOCATIONS IM NINE COUNTRIES 4 FREE INFORMATION 93 AAAAAAAAAAAA GREEN COLOR 0 6 LED ALARM CLOCK THE MOST ADVANCED TIMEPIECE DIGITAL AUTO SECURITY SYSTEM OF ITS KIND IN THE WORLD PERSONAL CODE LCD Quartz Alarm Chronograph with calen dar and dual time zone Watch is the same as Setko but you pay a lot more for the name Features e proximity triggered voltage triggered e mechanically triggered 24 hour alarm Chronograph counts up to 12 hrs 59 mins 59 9 sec Precision of chrono up to 1 10 sec indicated by 10 moving arrows Lap time with chrono run ning uninterrupted Time displays by LCD for hour min sec day date of the week and Calenda
54. 14 95 7 95 TK 80A 299 00 16K 416 5 8224 2 75 16K 16Kx1 300NS 16PIN l Rockwell International 8226 1 98 6810 3 95 AIM65 8228 3 98 475 6820 3 95 UART s epar 3 98 n e kp Part No Price has an addressing Capability upto 65K bytes and an AY5 1013A 54 80 4 25 and three spare sockets are included 10 expand on board ROM or PROM up to 20K bytes An application Connector provides tor attaching TIY and one or two audio cassette recorders and gives external access to Ihe user ded tated general purpose 1 0 lines Also included as standard a comprehensive AIM 65 User s Manual 8 handy pocket reference card an 86500 Hardware Manual an 6500 Programming Manual and and an AIM 65 schematic AIM B5 15 packaged on two compact modules The circuit module 15 12 inches wide and 10 inches long the keyboard module 15 12 inches wide and 4 inches long They are COnected by a 8253 14 95 6852 4 95 280 CTC E Zilog 780A 13 10 Z80 DMA 32 20 AY3 1015 5 50 5 25 1K CMOS RAM Part No Price 5101 4 95 4 50 450NS Low Power deiachable cable ZB0 SIO 0 45 00 AIM65 375 00 280 Z804 CPU 16 20 Z80 SIOn 45 00 MULTIBUS MEMORY LARGE SCALE MULTIBUS MEMOR Los 31090 MEMORY ONLY a Z804 PIO 513 10 ZRO SIO 2 45 00 L E D LAMPS
55. 14150 716 874 5848 CIRCLE 41 ON FREE INFORMATION CARD LEADER PRECISION PRECISION TRIPLETT VIZ Non Linear Systems 25MHz Dual Trace Dual Time LBO 515 Scope with Variable Delay DIGITAL MULTIMETERS WEL 8022A Extensive overload and transient protection Rugged construction Hi Lo power ohms for in circuit resistance and diode testing 10 MQ input Impedance doesn t load circuit 200 hour battery life low battery Indicator Large LCD readout 2000 counts 1 year calibration cycle One hand operation NOW 129 BASIC SPECIFICATIONS M Vette Corremt Current LEADER xe Due Instruments Corp Built in variable delay circuitry tu Sec to 5 Sec 16 5 5mV Div Vertical Sensitivity BT ISU Bh Rectanguiar 8 x 10Div CRT with internal graticule _ 1 1 7 5 Selectable synchronization automatic normal DIGITAL MULTIMETERS single trace and reset modes 3 3 gt _ _ _ REG 1395 14nSec rise time 8 Trigger CH 1 or CH 2 filter plus TV sync assures Stable displays 0 1 Basic accuracy 020 NOW 26 Ranges 5 Functions plus New Conductance Function for up to 10 000 MQ Leakage Measurements Extensive Overload and Translent Protection Rugged C
56. 2 00 postage and handling California residents add 6 Sales Tax VISA Mastercharge state number expiration date and signature OEM and institutional inquiries invited 10080 BRAND NEW FEATURES FOUR JUMBO INCH LED DISPLAYS 24 HR REAL TIME FORMAT 24 HR ALARM SIGNAL OUTPUT 50 OR 60 Hz OPERATION LED BRIGHTNESS CONTROL POWER FAILURE INDICATOR SLEEP amp SNOOZE TIMERS DIRECT LED DRIVE LOW AFH COMES WITH FULL DATA COMPARE AT UP TO TWICE OUR PRICE MANUFACTURER S CLOSEOUT MINI PROJECT CASE Black Motded Plastic 2 x1 x2 in Has open front with mounting ears so unit can be easily attached to auto dash etc Case has molded card guides for mounting PC Board inside Perfect for digital clocks car burgtar alarms or almost any electronic project Can also be used for sis v ya modules uper Specia 75 each Purchase COMPLEMENTARY POWER TRANSISTORS SILICON NPN AND PNP TO 220 CASE 40 PD 30 WATTS FOR AUDIO POWER AMPS ETC YOUR CHOICE 3 FOR 1 SONY 30 WATT AUDIO AMP MODULE WHILE THEY LAST 92 Digital Research Corporation P O BOX 401247A GARLAND TEXAS 75040 214 271 2461 STK 056 30 WATTS SUPER CLEAN AUDIO 20 HZ to 100 KHZ 2 DB HYBRID SILICON SELF CONTAINED MODULE ONLY 1 X2 IN WITH DATA COMPARE AT UP TO TWICE OUR PRICE 99 TERMS Add 30 postage we pay balance Orders under 15 add 75 handling No C O D We
57. 4004 190 2 10 2 40 258 202 1 10 1 20 130 2SC 632A 35 40 45 25C 1212A 80 90 100 250 130 1 10 1 25 1 40 4005 200 220 2 50 258 220 90 110 120 2SC 634A 35 40 45 25C 1213 30 35 40 250 187 35 40 45 56 613 520 540 595 2SB 303 30 35 40 2SC 680 190 210 240 25C 1215 35 40 45 250 201 2 30 2 40 2 65 78L05 90 1 00 110 258 324 30 35 40 2SC 681A 3 00 3 25 350 25C 1222 20 27 30 250 202 3 40 3 55 3 90 MPS U31 150 1 70 190 258 337 70 80 90 2SC 684 80 90 100 2SC 1226 50 55 60 2SD 218 250 2 70 3 00 SN 7400 15 17 19 PRICES MAY CHANGE WITHOUT NOTICE COD ORDERS WELCOMED IMMEDIATE DELIVERY WITHIN 48 5 ON ALL TRANSISTORS IM STOCK FUJI SVEA ENTERPRISE a Division of Svea Incorporated Box 40325 Cincinnati Ohio 15210 Telex 21 4732 Minimum order 5 00 residents add 4 sales az Add 1 00 postage and handling Quantity discount prices Ask For Our Complete Price Lie Manulaciurer inquiries Welcomed All parts quaranteed against factory defect TOLL FREE TELEPHONE LOCAL 513 874 0220 874 0223 Nationwide 800 543 1607 800 582 1630 Hours Mon Fri 10 7 Sat 11 5 6 6L 107 ____ WE VE THE BUG THE NEW MOTOROLA BUG 151 By now you ve probably read the article in June issue of Kilobaud about Motorola s new fantastic Miro Chroma 68 It 15 the latest in TV Bugs which enables you to hook up directly to your own standard color TV with the fewest of parts Micro Chroma 68 kit includes MC137
58. 404 u sdujeejd ui AjAgisues e O 0r L Wddl O 8559 eun OXOL e 419 UN0D ZHINOO9 9 ZHOL x SH31NnOD 318V1HOd AHSLLVE OQ OV MAN OML SIN T IMV 1IIL 10 3IVI
59. 449 7475 276 1806 79 ae x 7476 276 1813 596 Hist d inline Relay 7485 276 1826 1 19 7486 276 1827 496 7490 276 1808 794 7492 276 1819 69 74123 276 1817 99 senses Fits Std 14 74145 275 1828 1 19 0 PC Board Mounts two 14 or 16 pin ICs or sockets for bread boarding Copper clad Pin IC Socket 21157 1 39 2V2X5X1 6 276 151 MEE P JN gt gt 2 99 741 276 1 1 29 i pi 74192 276 1831 119 nd aia ne cis o 16 pin NONE __ __ 74194 276 1832 1 19 16 Pin IC Test Clip 276 1951 NM et 74196 276 1833 1 29 6 16 Pin DIP Header With snap on cover 276 1980 uds 1 29 Subminiature relay is designed for use 4001 276 2401 49 E 8 Position DIP Switch 275 1301 1 99 with TTL or CMOS circuitry Contacts pa IM a 4 Position DIP Switch shown 275 1304 rated 1A 125VAC Coil requires 4013 276 2413 896 F Vertical 16 pin Socket For LED displays 276 1986 gt 5VDC Coil resistance 50 ohms 4017 276 2417 1 49 8 16 Pin DIP Jumper Cable 18 long 276 1976 oe 3 99 275 2158 et art 4 49 4020 276 2420 my 4021 276 2421 1 4 4023 276 2423 696 Digital IC 495 4027 276 2427 894 4028 276 2428 1 29 Logic Probe 25 18 404 6 244 9c a 4050 276 2450 69 Multi Logic Family 4051 276 2451 1 49 Compatibility 4066 276 2466 99 4070 276 2470 694 from 5 15VDC Lead Zero Bia
60. 8j 4128 19 R 22 20 Disposable probe cover 4366N 95 197 708 amp Assy In gram loading editing and execution with SINGLE features at additional cost or not at all Compare 74367M 95 lt A SUA n compact case Switches trom F to C STEP tor program debugging which is not in before you buy Super Kit 106 95 High 27006 155 290 COMPUTER BOARD KITS Tem 7 5 27161 29 50 8K RAM Board 5135 00 cluded in others at the same price With SINGLE address oplion 8 95 Low address option PALSOUN F pla um IM 3 95 2716 Inel 4800 EPROM Kit 114 95 STEP you can seethe microprocessor i ith dri S04N 25 1030 995 2 02 L 4 1 60 Board 44 50 8 9 95 Custom Cabinet with drilled and labelled MM 5 L6G CRYSTALS Extender Board wiconnector 12 50 ting with the unique Quest address and data bus plexiglass front pane 24 95 NiCad Battery TSOEN 22 ICL7103 350 2102 55 sun TER err ors displays before during and after executing in i 74L510M 25 ICL7107 1425 2105 4 95 4 4 25 Additional Orive 41500 uting Memory Saver Kit 6 95 All kits and options 22 8702 1795 21078 i2 i Y onal structions Also CPU mode and instruction cycle also come completely assembled and tested 74LS14N 90 2111 1 375 10MM SPECIAL are decoded and displayed on eight LED indicator H A 2 21143 im T E 730 l
61. A through P for those nonin terfering signals I can t think of an easier way to remotely control electrical functions in anyone s home or apartment and the price is surprisingly reasonable for what the equipment can do This is one of those products among the many Jupa ea Have Radio Electronics delivered to your door every month we ve tested that I am pgoing to want for myself The System X10 is available from Ad vanced Electronics 54 W 45 St New York NY 10036 R E RCA CDP18S020 COSMAC Evaluation Kit THE RCA 1800 SERIES COSMAC MICROPROCESSOR and its associated family of devices have a couple of unique characteristics First because they are COS MOS devices the power drain is low starting at the milliwatt level Single IC standby memory power is also in the low milli watt range Second the 1800 family tolerates an unusu ally wide power supply range 3 to 12 volts for and be sure of getting your copy even if your local newsstand runs out Save money too while you enjoy the best electronics magazine of all Every page is packed with excitement and ideas with news you won t want to miss projects you ll want to build servicing tips you ll want to learn equipment test reports you ll want to read before you buy Make sure you get it all by making sure you get every issue of Radio Electronics from now on Check out the subscription offers on the coupon below offers that can save you up to 18 00 off the
62. CT ON UNDERSIDE OF BOARO the main PC board hg G I x FIG 10 PLACEMENT OF SEVEN SEGMENT READOUTS on the dispiay PC board Be sure that the readouts are right side up and that DS4 is in correct position a AD590 Seed 5 MINUTE EPOXY FIG 11 HOW TEMPERATURE PROBES ARE CONSTRUCTED Note that clear quick setting epoxy ROTATE WHILE EPOXY SETS cement is used to insulate and seal the sensor connections positive and negative leads back to inch in length and tin them Remove inch of insulation from the end of the probe cable and twist and tin the shield and the center conductor wires Solder the shield to the sensor s positive lead and the center conductor to its negative lead Clear drying five minute epoxy ce ment should be used to waterproof the sensors Thoroughly mix some epoxy and apply it around the solder connections on the sensor while rotating the cable see Fig 11 while the epoxy sets Calibration After completing the sensor probes plug them into the instrument and apply power to the circuit Even without cali FIG 9 SLIDE SWITCHES and few other parts are mounted on side 2 of Calibration requires a DVM to set the reference voltages Connect the negative lead to pin 2 of the 7905 voltage regulator 1 3 and the positive lead to ground and then check for 5 volts 0 25 volt Next connect the positive DVM lead to pin 2 of the
63. GETTING STARTED Basic starter kit includes 1 Command Console 2 Lamp Modules 1 Appliance Module Only 87 95 plus 3 00 shipping and handlirg Exra Lamp and Appliance Modules 16 00 each Wall switch modules also 16 0C each Extra Command Consoles 39 35 each appliances from any location in your home without a lot of running around MICROPROCESSOR BASED DESIGN The BSR X 10 System uses the latest digital techniques for BSR X 10 System 4 starter kit 87 95 set trouble free operation Digital pulse codes are sent through Lamp Modules i each n h Applian 00 the power lines to assure reliable control throughout caben ad oes the system Amazingly compact the commanc console Command Consoles 39 95 each is only 434 X 3V2 X 3V2 To order use this call TOLL FREE HOT LINE 800 223 0474 IN NEW YORK STATE 212 687 2224 54 West 45 Street New York N Y 10036 Payment enctosed Ba my MASTER CHARGE VISA eee ee Exp Date d o qa i e m LAMP MODULE Each module will control any incandescent lamp rated up to 300 watts from control signals received from the Command Console city Name Add 3 00 Shipping Zad ing NYS Res add sales tax RADIO ELECTRONICS John Simonton s time proven design provides two envelope generators amp VCF in a low cost easy to use package Us
64. LI E rejects m ea 50 for e 25047 1024 bit shift register 10 99 80 LERO um SWITCH 004025 CMOS 3 input NOR gate DIP d AC posed 14 pin DIP 9 04011 CMOS 2 input NAND gate 9 IC vSed to trigger TRIAC MC4015 TTL quad latch MOTOROLA devices RCA CA3079 F EE 60 ea 5 ten DIP TRIMMER 75451 dual peripheral driver e 445058 1024 bit static shift reg 7402N quad 2 input NOR TTL gate 74304 8 input MAND gate 74924 divide by 12 TTL counter ta XI 50380 08836 NOR BUS receiver 1 00 12 TUR VI DM8811 quad MOS interface IC 50 5K or 200K only Ta Yo pwr dua SR flip flop 25 m g DALE pin compatible 7400 A 10 TEN i pu 8270 4 bit shift reg 308 5 50 FOR 54 10321 dual JK flip Flop SIG 25 Lun LINEAR IC s 747 dual 741 op amp 50 WATT RESISTORS 9 i TT068PC Su audio out w heat sink 1 25 1 A8M 1 6070 IW out audio 1300 precision regulator 10 59 501 10 ta 390 L8k pe 6 ap Y 2307 op aep improved 741 a 35 43k 68k 240k percent to LM308AH micro pwr 1 00 uA715 h speed 100 us 60MHz op amp 80 FOR 4 available in DIP DIL or T099 2 004 _ MC1303 Motorola sterio amplifier 2 75 programmable op amp 1 00 POTTER UO e L 309K 5V AMP REGULATOR TO 3 1 0 BRUMFt 7812K 12 1 AMP REGULATOR 10 3 35i L51412 12 3 REGULATOR 10 3 KHP RELAY
65. P Terminal and each hole You complete your cir Otherwise the program is started at the Distribution Strips are cuits with ordinary solid wire jump address typed immediately after P ers you don t need special patch A large loose leaf binder comes with the kit ideal building blocks cords Terminals clip tight make su IL includes detailed sections on kit assembly for your breadboarding perb contact after time They re design and operation of the system the utility Now you can put together assim _ noncorrosive copper alloy 770 CE ane ple or as elaborate a breadboard These versatile building blocks priced at Qs you want and be sure of top come in wide variety of shapes 249 and is available from RCA Solid State quality all the way and pay only andsizes and we include hardware Division Somerville NJ 08876 or from RCA for what you need Using AP Termi and mounting templates with each Solid State distributors R E nal and Distribution Strips as mod strip You get all the flexibility in ules is the world s most economical the world way to assemble full performance Where At your nearby A P Prod J solderless breadboards ucts dealer Need the address You know how our strips work Your Phone toll free 800 321 9668 And electronic components plug right ask for the complete A P catalog into the spring clip terminals behind The Faster
66. PIN 24 LM555N 8 29 Timer 741CN 8 r Op Amb 16 PIN 14 28 PIN 28 LM556N 14 59 Dual Timer LM1458N 8 49 Dual Op Amp 18 PIN 18 40 PIN 40 LM723CN 36 Voltage Regulator RC4558N 8 45 Dual Op Amp 20PIN 20 LM723CH 39 Voltage Regulator P O BOX 1035 FRAMINGHAM MASSACHUSETTS 01701 Over the counter sales MINIMUM ORDER 10 00 ADD 2 00 TO 12 Mercer Rd Natick Mass 01760 COVER PCSTAGE amp HANDLING Behind Zayres on Rte 9 4 7 Foreign customers please remit payment on 17 87 7 Telephone Orders 8 Enquifles 617 879 00 internationa bank dratt or international postal IN CANADA money ordar American dollars gt 5651 FERRIER ST 4800 DUFFERIN ST BAXTER C NTRE VANCOUVER C MONTREAL QUEBEC DOWNSVIEW ONTARIO t050 BAXTER ROAD OPENING H4P 2K5 M3H 5S9 OTTAWA ONTARIO 1979 514 735 6425 416 561 1115 K2C 3P2 613 820 927 e 97 CIRCLE 19 ON FREE INFORMATION CARD RADIO ELECTRONICS You Are Not ALONE FREE KIT Catalog AUTORANGE DIGITAL CAP METER KIT Still the best for only 74 95 TEST amp c Phone 415 447 3433 EXPERI Write or Phone for FREE CATALOG 5 Average l minute Saturday call is 21 SCIENTIFIC INSTRUMENTS DAGE 1054R LIVERMORE 94550 HIGH STABILITY CRYSTALS FOR FREQUENCY OR TIME nnn USE THE BEST BUY JAN CRYSTALS OSHA TEST YOUR Economics Quotient
67. RHDP 600 1995 4 7 Sg Digit LHDP 60 1995 Overrange character 1 600 1500 4x7 501 Digit Hexadecimal 600 22 50 SOLDERTAIL STANDARD TIN Pn LP SOLDERTAIL STANDARD GOLD WIRE WRAP SOCKETS GOLD LEVEL 3 1 4 WATT RESISTOR ASSORTMENTS 12 OHM 33 OHM 82 OHM 220 560 OHM 1 54 3 9K 10K 27K 58K 180K 470K 1 2M 3 3M 15 OHM 39 OHM 100 OHM 270 OHM 680 OHM t Bk 47 12M 33K 82M 220K 560K 15M 3 9M 18 OHM 37 OHM 120 OHM 330 OHM 820 OHM 5 6K 15K 19 100 270K 680K LEM 4 7M 1 24 25 49 50 100 22 pn LP 37 36 35 24 pin LP 38 137 36 28 LP 45 44 43 63 62 61 28 pa ST 99 90 81 36 pn ST 1 39 1 26 1 15 40 pin ST 1 59 1 45 1 30 24 pn SG 70 63 57 26 SG 1 10 1 00 90 36 6 1 55 1 40 1 26 SG 1 75 1 59 5 22 pn WW 95 5 75 24 pin WW 1 05 95 85 28 pin WW 140 1 25 1 10 36 pin WW 1 59 1 45 1 30 40 pn WW 1 75 1 55 22 OHM 56 150 OHM 390 OHM 1K 6 8K 18K 47K 120K 330k 820k 2 2M 5 6M Includes Resistor Assortments 1 7 350 PCS 10 00 MINIMUM ORDER U S Funds Only Spec Sheets 25 California Residents Add 6 Sales Tax ameco MAIL ORDER ELECTRONICS ELECTRONICS CLOCK CHIPS MM5309 MM5311 M445312 MM53t4 MM5316 MM5318 MM5369 MM5387 1998A MM5841 4 95 MOTOROLA 140817 4 95 MC1408L8 5 75 MC4016 74416 7 50 MC4024P 3 95 M
68. SUPER 1S WATT AUDIO AMP KIT qa T m power transformer front Amp with tone control ali mm a am electronic parts as well as PC Board Less than 0 5 88 88 Model 737 01 for clock 19 lt harmonic distortion at full power dB response from MTM 4 digits with PM alarm 20 100 000 Hz This amplifier has QUASI Compli snooze indicators 523 50 each mentary class B output Output max is watt 10 watt 8 88 Model 739 04 for panel RMS at 4 0 MINI ELECTRONIC tio ORGAN KIT PET 102 25 KEYS 2 7 The kit contains ail electronic mechanical parts key boards speaker switches and PC Board as well as the wooden cabinet Ideal for schooi project or gift to children interested in electronics Uses 6V C size x 4 battery not included 38 50 MANY SOUND DECISIONS Solid state sound indicator operating voltage 6V DC 30 4 Small size approxi mately 3 4 X 4 Model 682116 Continuous Model EB2126 Slow 5 53 60 EACH Model EB2136 Fast Pulse 777777779 ON AA ADAG HLLLLLEEPLLLELTLITIE 1111 NEN Slow pulse Fast pulse Continuous AUDIO AMP parts pre assembled f on a mini PC Board i Supply Voltage 6 9V D C SPECIAL PRICE 1 95 ea FISHER 30 WATT STEREO AMP MAIN AMP 15W X 2 Kit includes 2 pcs Fisher PA 30 Hybrid IC electronic par
69. TP DROPOUT nl PULSE FIG 6 VIDEO FM SIGNAL PROCESSING CIRCUIT is made up of two separate video demodulator circuit modules switch and can be monitored at the test point on pin 10 The electronic dropout switch receives 540 ns delayed video on point and one line delayed 64 us composite video on point B The voltage at pin 15 determines which of these signals is applied to the electronic burst switch The voltage at pin 15 is the high frequency identification voltage from the dropout detector module When a dropout occurs the voltage goes high and creates a dropout pulse for the duration of the dropout The dropout switch is normally in position and receives the unde layed video 540 ns However when a dropout pulse is present the dropout switch moves to position B and receives the delayed video 64 us The selected signal leaves at pins 7 and 11 The 540 ns delay line compensates for the dropout response time About 540 ns is required for the dropout circuitry to respond to the actual dropout Thus the undelayed video is actually delayed by 540 ns When a dropout occurs the unde layed video remains present at position A of the dropout switch for 540 ns and gives the dropout circuit time to switch in the delayed video The actual time difference between the two video signals is 64 us minus 540 ns This equals about 63 5 us The electronic burst switch on the video demodulator II module is used to maintain the 180 phase
70. WATT FEATHERWEIGHT SOLDERING IRON WITH REPLACEABLE TIPS Designed for hobbyists and technicians SLASHED TO 5 99 CIRCLE 33 ON FREE INFORMATION CARD FAIRCHILD RED LED LAMPS FLV5057 Medium Size Clear Case RED EMITTING These are retested off spec units as sold by some of our competition These are factory prime first Quality new units 10 FOR 51 eh _ 50 FOR 4 WE BOUGHT 250 000 PCS THE COLOSSUS FAIRCHILD SUPER JUMBO LED READOUT A full 80 inch character The biggest readout we have ever sold Super efficient Compare at up to 2 95 each from others YOUR CHOICE 149 FND 847 Common Anode 6 for 6 95 FND 850 Common Cathode 16K DYNAMIC RAM CHIP WORKS IN TRS 80 OR APPLE H 16K X 1 Bits 16 Pin Package Same as Mostek 4116 4 250 NS access 410 NS cycle time Our best price yet for this state of the art RAM 32K and 64K RAM boards using this chip are readily available These are new fully guaranteed devices by a VERY LIMITED STOCK MAGAZINE SPECIAL 8 For 79 50 G I FULL WAVE BRIDGE 4 AMP 600 PIV 3 4 In Square With Lugs LM 1 75 ea 3 2 EXPERIMENTER S HEATING PLATE major mig FAIRCHILD PNP SUPER TRANSISTOR 2N4402 TO 92 Plastic Silicon PNP Driver High Current VCEO 40 HFE 50 lo 150 at 150 FT 150 MHZ A super BEEFED UP Version of tne 2N3906 8 FOR 1 FET SALE 2N4304 Brand New N Channel Junction Fet BVGDO 30V IDSS 15 MA Typ 1500 uMHOS TO 18
71. accept Visa Master charge and American Express cards Tex Res add 5 Tax Foreign orders except Canada add 20 P amp H 90 Day Money Back Guarantee on items EPROM S Special of the Month 1702A 6 6295 4 45 256 8 1 515 9 95 IK x 8 450 NS MOS Static RAM s PartNo Price 2101 5245 2 99 2102LFPC 249 1 14 1K 35045 Low Power 21021 98 0 94 1K 450NS 2114 56 99 6 75 4K 1K x 4 300NS 2114 6 50 4K 1K x 4 45045 MICROCOMPUTER BOARDS SYM 1 MICROCOMPUTER BOARD e Hardware compatibility with MIM 1 e Standardontertaces include audio cassetig with remote control both 6 bytes second KIM ano 185 bytes second 5 1 casselte formats and 5232 system expansion bus TV KB expansion board nlectace jour buffers ana an oscilioscope Single ne display Singie t 5V power reqwrements SYM 1 329 00 MOS Dynamic RAM s INTERFACE i INTERFACE Part No Price NEC MICROCOMPUTER TK 80A SUPPORT CIRCUITS AK 4027 295 xri 1 300NS 16 PIN II Also features 300 200 baud cassette I 8212 1 98 8255 4 95 16K 416 3 9 95 Ports 24 unesi Keypad wiih 25 reat neys not a quonia n 10 95 16K 16Kx1 200NS 16PIN asplay also inctuded 59
72. addition 50 commonly used phrases are listed on the back of the translator with a code number for each You just type the code number on the translator and the foreign equivalent appears on the fluo rescent display that holds up to 16 letters but can accom modate more with a right to left crawl similar to that on a movie theater marquee display Any of 1 500 words may be entered on the keyboard for translation to any language whose cartridge is inserted in the machine In addition the unit helps correct spelling works as a language quiz machine and fulfills other language learning functions While the first generation of these machines helps accomplish the obviously important function of language translation future cartridges will fulfill other needs Recipe storage dictionary synonyms and calorie counting come to mind immediately and undoubtedly there will be more According to Craig a near future generation of the ma chine will be programmable making it an important device for storage of personal information DAVID LACHENBRUCH CONTRIBUTING EDITOR COMPARABLE AMPLIFIERS DO SOUND DIFFERENT Choosing the best amplifier for your audio system involves comparing specs features and of course price But ultimately if you love music you should base your decision on the way an amplifier sounds when reproducing music Two amplifiers may have identical power ratings and virtually no Tota Harmonic Distortion but can sound v
73. al ae D3 ON OFF 1N4001 C16 R33 1000 uF 1202 01 02 03 22926 OR 2N3904 RADIO ELECTRONICS sponds the varying levels of infrared skin transmissivity caused by the chang ing blood volume with each heartbeat The phetotransistor Q1 senses am plifies the signal for further amplification by ICI 2 The bandpass amplifier IC1 ampli fies the signal within the range of about 03 1 5Hz 60Hz 40 OUTPUT 0 5 Hz to 6 Hz to reduce 60 Hz hum and other noise source problems It is a non inverting amplifier with the variable gain controlled by sensitivity potentiometer R9 Resistor R10 is an end mounted resistor that is used as a scope test point for the electrocardiogram signal 3 The Schmitt trigger IC2 is trig TO C5 R11 JUNCTION TO 12V R15 R16 z 100K 10K 25 R17 C7 2 2K 01 12 3 02 103 To A 818 555 n 6 555 C6 1 R14 t cg 1 300mSec CAL SIGNAL S j m INPUT POINT FROM C19 12V R30 M ME 300mSec 3902 x 100 M R29 R38 102 IK LEO 1 om CES aK 7 4 500 Hz 01 R21 R22 7 9 1K 7 5K 1N914 R28 IC5 M R tcm 10K E 555 2 PUR T 1 5 e 1800 A r R23 V2MC1458 10K C13 1 T 1 R26 R38 Q 12V 1K 4702 R24 R37 R25 R32 10K 82K 47K 5K d VOLUME GREATER 28 12V SOURCE 53 CALIBRATE C18
74. and present them in the best way we know how either as an application note a construction or tutorial article etc Certainly a percentage of the new ideas come from you our reader But the percentage 15 small Too small This could be interpreted to mean that our readers are basically idealess This is surprising as it has been our contention for many years that you our reader the electronics activist are a vast untapped reservoir of new ideas Why then haven t we seen more of your ideas We feel that the problem comes down to the fact that it is just too much of a pain to write an article about the ideas that you have Let s face it writing a three or four page article is downright difficult We now think we ve found a solution It s a new column and you guessed it it s called New Ideas It will consist of just about anything innovative It could be a new circuit IC application gadget or even an innovative use for a new component a new way to hook up your test equipment or a new or faster way to lay out or etch your PC boards Submitting your idea is easy but it must include an illustration If it is a new application of a component or a better circuit approach to something that has already been done include a schematic or a pictorial drawing You can draw it freehand but be sure that it is legible If we use it we ll have it redrawn by our illustrators Otherwise a photograph black and white and in focus please will suff
75. and Easier Book gt F lt PRODUCTS A amp E INCORPORATED y 1 Box 110 B 72 Corwin Drive II Painesville Ohio 44077 2 Tel 216 354 2101 TWX 810 425 2250 TOWNSEND No matter what the project he s working on is supposed to be it ends up being a light dimmer CIRCLE 56 ON FREE INFORMATION CARD KEINE ALL THE MOST WANTED FEATURES AT A MOST WANTED PRICE BIG HIGH LCD DISPLAY USE INDOORS OR OUT 200 HOUR 9V BATTERY LIFE AUTO ZERO POLARITY OVERRANGE INDICATION 100 mV DC F S SENSITIVITY 19 RANGES AND FUNCTIONS 5 495 HICKOK T4E HICKOK ELECTRICAL INSTRUMENT CO 10514 Oupont Avenue Cleveland Ohio 44108 216 541 8060 TWX 810 421 8286 Here is the handfull of accuracy youve been waiting for Hande somely encased Compact Efficient Only120unces Hickok s exciting new LX 303 3 digit Mini Multime ter with high quality components one year guarantee and rugged Cyco lac case offers features previously found only in ex pensive units at a price under 75 00 So why wait any longer The amazing LX 303 is here NOW Another American made test equip ment breakthrough from Hickok The Value Innovator Order today Removable cover stores test lead set furnished as part of the unit Available accessories include AC adapter padded vinyl carrying case 40KV DC probe 10 Amo DC shunt X10 DCV pr
76. as joy Slick Jk memory required 14 95 posipaid 3 Tom Pitman s Short Course on Tiny Basic for ELF 5 postpaid J ELF BUGTM Deluxe System Monitor on casselte tape Allows displaying the contentis of at registers on your IV at any point in your program Also displays 24 bytes ol memory with tuli addresses blinking Cursor and auto Scrolling must lor 1he serious programmer 14 95 postpaid CJ Text Editor on cassette tape gives you the ability 10 inser delete or edit ines and words fom your programs whe they are displayed on your video monitor printer and you can use ELF II to type error tree letters plus insert names and addresses trom your mailing OSI 19 95 postpaid Assembler on cassette tape translates assembly language programs into hexidecimal machine Code tor ELF use Mnemonic abbreviations for instructions father than numencs make programs easier 10 read and help prevent errors 19 95 postpaid C Osassembler on cassette tape lakes machine code ings 10 help you understand and mmprove your programs 19 95 on cassette tape SAVE 9 90 Editor Assemble amp Disassembier purchased together only 49 95 Require Video Dis play Board plus 4k memory ELF II Light Pen assembled amp tested 7 95 pius 1 p amp r LI ELF II Color Graphics amp Music System Board ki 43 95 pius 2 L ELF II connects direcliy 10 the video of your IV sel without additional hardware TO co
77. at bargain prices Includes such items as special phone equipment 8 laminating machine a digitai clock a solid state color TV chassis a radar detector plus hundreds of other discounted items The catalog features a special 16 page insert offering quantity discounts to and volume users ETCO Elec tronics Corp Dept 077 North Country Shopping Center Plattsburgh NY 12901 CIRCLE 142 ON FREE INFORMATION CARD TOOLS amp HARDWARE CATALOG Catalog 179 contains 196 pages of hand and power tools for the hobbyist and technician Also included among the Items listed are voltmeters radar detectors wire and cable strippers TV antennas CB radios and accessories telephone amplifiers and many many more Order form and handy index are included 1 refundable with first order U S General Supply Corp Dept R E 100 General Place Jericho NY 17753 DIGITAL STORAGE SCOPES Bulletin 449 5 contains 6 illustrated pages covering two dual trace oscilloscopes providing infinite storage time The model 054000 is a 10 MHz dual trace scope the model OS4 1000 offers X Y capability Complete specs are given Gould Inc Instru ments Div 3631 Perkins Ave Cleveland OH 44114 CIRCLE 143 ON FREE INFORMATION CARD ELECTRONIC PRODUCTS BROCHURE 1979 Distributor Short Form Catalog contains 12 pages summarizing technical specs and order information for resistor networks trimmer pots turns counting dials LCD s and planar gas di
78. bad spot on the videodisc is encountered the 8 MHz signal disappears and the dropout detector senses its absence The 8 MHz signal is also applied through the 64 us delay line the time period of one horizontal line to video demodulator II When a dropout occurs the dropout detector activates the electronic dropout switch It then applies the previ ous horizontal line in place of the one that was dropped out The result on the screen is two successive horizontal scan lines with the same video information signal processing circuitry is located on the video servo board The total FM signal from the preamp module is applied to the high frequency processor module as shown in Fig 3 The RF amplifier amplifies the entire signal Gain control R3002 sets the correct amplitude output The output from the RF amplifier is fed to the input of the sound FM amplifier This input is tuned and therefore passes only the 2 3 MHz and 2 8 MHz sound carriers Both of the amplified sound carriers BURST E dL VIDEO 12 23 28Muz ROM 7 PRE AMP FM VARIABLE FREQ HIGH FREQ EMPHASIS PROCESSOR L 70398 5 13 FIG 3 FM SIGNAL PROCESSING CIRCUIT uses the signals provided by the preamp appear at pin 15 of the FM amplifier As we pointed out earlier the high frequency portion of the RF signal taken off the videodisc has less amplitude at the inside of the videodisc than the s
79. be something I m missing What is it E D Tappan NY In a typical vertical output tube circuit for many color sets there is a little 50 F electrolytic capacitor in the output stage cathode If it goes bad it can cause all different kinds of trouble The big headache is that in this chassis the capacitor itself is not on the chassis it s over on the convergence board Be cause even the schematic shows it s ap parently not there we overlook it As this capacitor seems to be the only component you haven t changed try testing it OHMMETER CAN TEST SCR S Several readers have written to ask if an SCR can be tested with an ohmmeter the same way that transistors can Trying this test out showed that you can use an ohmmeter at least with smaller SCR s First measure the SCR from the anode to the cathode This should show an open circuit in both directions Now connect the positive lead of the ohmmeter to the anode and short the gate terminal to the anode where the positive lead is located This should turn the SCR on The larger SCR s won t latch on but will conduct either polarity when the gate is shorted to the anode You can definitely check SCR s for shorts just as you d check a diode R E TUNE in with DAVIS 850 includes probes and front cover Full Features Yet Portable Say Hello to an excitingly new 15 I 15 MHz scope Smart looking and really convenient only 5 high yet
80. burst switch pulses are at 30 Hz because only one half of each track is read at a time The burst switch is then in position B for revolution of a second and position A for the other half revolution The resultant composite video signal is coupled out of the module at pin 17 where it is sent to the video processor module The composite video at pin 7 is identical to the signal t pin 17 except it lacks the burst switch correction This signal is sent to the reference control module The video signal from the electronic burst switch is coupled to the first video amplifier in the video processor module at pin 17 as shown in Fig 7 The video blanking input at pin 16 blanks the video signal during the return of the light beam to the inside of the videodisc and also during initial turn on The video signal from the amplifier is processed by the DC clamp circuit It clamps the video signal to the correct DC level The clamp adjust control R3029 can vary this DC level The DC clamp is driven by a horizontal rate clamp gate pulse at pin 15 The DC level is corrected during each horizontal blanking interval Composite video is clipped in the reference control module by the amp clipper stage The resultant clipped video contains the digital code that represents the picture number This code is applied to a decoder on the mode control module The video generator actually creates the video signal for the picture number video signal is also
81. but no EPROMS 1339 with 4 EPROMS 179 with 8 EPROMS 219 WINC ine drive shugart pertek remic 5 amp 8 drives up to 8 drives on board PROM with power boot u included PC 8D will operate with CP oe ne eee FPB 1 Front Panel Finally AMSAI size hex not 95 displays Byte or instruction single step MEM 1A BKx8 fully buffered 5 100 uses 24 95 168 Kit QMB 12 MOTHER BOARD 13 slot termi 34 95 2102 type RAMS PCB pee 6 9 nated 5 100 board only oe 9 s ee oe ores eee 89 95 Kit CPU 1 8080A Processor board S 100 with 8 level vector interrupt PCBD 9095 89 95 Kit RTC 1 Realtime clock board Two independ ent interrupts Software programmable PCBD 25 95 4 C EPM 1 17024 4K EPROM card PCBD eee 60 95 Kit 25 95 49 95 Wi less EPROMS 49 95 HE QGMB 12 9 Slots PCBD e 3 o 2716 16K 38K 24 95 toes EM 2 16Kx8 Fully Buffered 2114 Board 25 95 269 95 Kit Mention part number description and price In USA shipping paid for orders accompanied by check money order or Master Charge BankAmericard cr VISA number expiration date and signature Shipping charges added to C O D orders California residents add 6 5 fo
82. console appliance module and a couple of lamp mod ules For less than 100 it is possible to buy a System X10 including enough modules to control lights and appliances at up to four different locations The command console model SC 311 through its keyboard permits remote control operation of lights or appli ances in up to 16 separate locations By rotat ing a bottom of the control switch more groups of 16 controlled switches can be provid ed It plugs into any AC wail outlet in the house and transmits FM command signals ov r the electrical wiring Optionally available is a cordless controller model CC401 It transmits signals to the ultrasonic command console over distances of as much as 30 feet functions of the command console are duplicated on the cordless controller The lamp module model LM501 will con trol any incandescent lamp rated up to 300 watts Functions include on and off bright and dim The appliance module model 601 turns an appliance on or off a TV stereo fan etc Maximum appliance ratings on a resistive load are 15 amp motorload horsepower incan descent lamp 500 watts A wall switch module RCA 5 5 make it easy for you to New Numbering System offer reliable service at ap ofit SKs now feature where applicable the product num bers of the other leading system used by ECG REN and TM For example whenever an SK device replaces an ECG device the EC
83. demodulator module as shown in Fig 6 The video demodulator I module receives the undelayed video FM signal and applies it to the FM demodulator stage at pin 15 The composite video output of the demodulator appears at a test point on pin 1 and is applied to the video amplifier This ampli fier has a frequency response extending to 4 2 MHz The amplifier s gain is controlled by R3013 The output from pin 4 is applied through DL3 a 540 ns delay line to pin 4 of the video demodulator II module Here the composite video signal is applied to point A of the electronic dropout switch The 64 us delayed video FM signal is applied through pin 17 to the FM demodulator stage on the video demodulator 1l module Its composite video output appears at a test point on pin 1 and applied to the video amplifier The frequency response of this amplifier is rolled off at 2 6 MHz because the 64 us delay line cannot pass signals above that frequency As a result drop out corrections are in black and white The effect is not notice able on the screen however Resistor R3013 controls the gain of the video amplifier The video output is applied to point B of the electronic dropout COMP VIDEO TO y VIDEO PROCESSOR 2VP P 08888 I I UNDELAYED FROM MODE VIDEO F MOO SUREH VIDEO PULSES L 1 I ISHZ STILL _ J 2 FAST F OR REV COMP_ VIDEO TO REFERENCE CONTROL 6405 DELAYED VIDEO FM
84. difference in the 3 58 MHz chroma signal from frame to frame during special modes of operation such as still picture reverse fast forward and slow motion The chroma signal is normally 180 out of phase from track to track on the videodisc This chroma rela tionship is also true from frame to frame on normal TV broad casts since it is standard NTSC format The purpose is to cancel 3 58 MHz interference in the picture However when the same track frame is being played over E i E r INSIDE THE VIDEODISC PLAYER The laser tube is visible in the center of the photo At the top are some of the many plug in modules and over such as during still picture operation the chroma signal would not be 180 out of phase from frame to frame To introduce this phase difference the signal is delayed by 140 ns every other revolution during still picture The 140 ns delay line 0122 is equivalent to of a 3 58 MHz period The electronic burst switches delay line DL2 in or out depen ding on the burst switch pulses at pin 16 These pulses come from the mode control module During normal play no pulses are present the burst switch remains in position A and the 140 ns delay line is not in the circuit During still picture the burst switch pulses are at a 15 Hz rate As a result the burst switch is in position B for sth of a second one frame and in position A for th of a second During reverse play and fast forward the
85. i y P k fa i wai es a R 14 A 1 A a 4 s m r M gt 3 E ua a Pree mas ins il di FE zi d a PN MS i P r F j d DE e eR rent I JE ND doa B a gi F Alo MORD asa ms P w Je Kier E I Pa d z Pa i FEF 7 ral Ie E nos FIG 7 DC AMPLIFIER with different design scheme than the amplifier in Fig 6 is evaluated using the same input waveform upper trace Output waveform shows phase shift of 400 Hz component JA S55 use this approach this repre sents the best compromise short of totally removing all capacitors in the signal path The output capacitors remaining in the circuit between the equalizer and flat amplifier and between the flat amplifier and the power amplifier are designed for a minimum low frequency time stant Comparing waveforms When comparing a DC amplifier or more correctly a fully DC coupled sec tion of such an amplifier with an AC coupled amplifier it is easy to note differ ences in the output by using a squarewave input signal The tilt of the output squarewave delivered by the AC amplifi er indicates the amount of phase shift in the amplifier s low frequency range In compar
86. mike kit Transmits a stable signal up to 30D yards with excep tional audio quality by means of its built in electret mike Kit includes case mixe on off switch antenna The UN KIT only 1 ee ee 5 solder connections VIDEO TERMINAL 5 a super looking rugged and accurate auto A completely self contained stand alone video ter clock which is a snap to build and install Clock minal card Requires only an ASCII keyboard and TV battery and super instructions This movement is completely assembied you only solder set to become a complete terminal unit Two units is the finest unit available 3 wires and 2 switches takes about 15 minutes available common features are single 5V supply FM 3 kit 1295 Display is bright green with automatic brightness XTAL controlled sync and baud rates to 9600 M FM 3 wired and tested 16 95 contro photoceil assures you of a highly readable complete computer and keyboard control of cursor I ee e PUER display day or night Comes in a satin finish an Parity error control and display Accepts and gener a a E m CLOCK KITS odized aluminum case which can be attached 5 ates serial ASCII plus parallel keyboard input The 3216 is 32 char by 16 lines 2 pages with memory dump feature The 6416 is 64 char by 16 lines with scrolling upper and lower case optional and has RS 232 and 20ma loop interfaces on board Kits include sockets and complete documentation RE 3216 terminal
87. nearest you Have you seen real computerized digital home weather station precision electronic scale for your bathroom or ad vanced educational programs that let you learn electronics or au tomotive maintenance at home or totally broadbanc ed ama teur radio transceiver the world s only programmable color TV with fully automatic antenna rotor If you haven t send for a free Heathkit Catalog L 1 Fi 8 i j 7 oo lt p SAVE You ll see nearly 400 unique elec AF477477 MAM ORDER CATALOG 399 tronic products the latest tech lt Z w w C 45 on Pre popular nology the newest features the Modulus Stereo best values The kind of quality IU System See page 7 products Heath Company has 2 been offering for some 60 years damis on dapt as It s fascinating reading But the excitement doesn t stop there These sophisticated products are easy to build kits illustrated step by step instructions guide you and detailed ex planations help you learn how the product works trom the inside out It s fun easy and educational C 3 Heath Company Dept 020 550 4 NEA Benton Harbor Michigan 49022 4 Please send me my FREE Heathkit Catalog am not currently receiving catalogs Name _ _ Address L _ e If coupon is missing write Hea
88. new jobs created by the expanding world of the computer Learn at Home in Your Spare Time NRI can train you for this exciting rewarding field Train you at home to service not only micro computers but their larger brothers too Train you at your convenience with clearly written bite size lessons that you do evenings _ or weekends without _ going to classes or quitting your present job Assemble Your Own Microcomputer NRI training goes far beyond theory It includes practical experience too As you progress you perform meaningful experiments building and studying elec tronic circuits on the NRI Discovery Lab You assemble test instruments that in clude a transistorized volt ohm meter and CMOS digital frequency counter instru ments you learn on use later in your work And you build your own microcomputer Each step of construction advances your knowledge gives you deeper insights into this amazing world that s upon us This is the only microcomputer de signed for learning It looks operates and performs just like the finest of its kind ac tually does more than many commercial units But NRI engineers have designed components and planned the assembly procedure so it demonstrates important principles gives you working experience in detecting and correcting problems And that s a cae what EE lt training Te is all E c ibout Oth
89. newsstand price and check off the one you like best Do it today and get in on all the electronics excitement every month Mail to Radio Electronics Name please print Address City indicate the offer you prefer 1 Year 12 issues ONLY 9 98 2 Years 24 issues ONLY 19 00 713 Years 36 issues ONLY 27 00 Save Even More Save 18 00 off newsstand price SUBSCRIPTION DEPT P O BOX 2520 BOULDER COLO 80322 You save 5 02 off newsstand price Save More 11 00 off newsstand price Extra Shipping Canada 3 00 per year all other countries 5 00 per year 41G9 Zip Code Bill me Check here if this is a new subscription Check here if you are extending or renewing your subscription H Payment enclosed pL VES m CIRCLE 103 ON FREE INFORMATION CARD the CDP1802 with a 3 2 MHz clock And the operating temperature range for the full speed processor and certain memory products covers the full 55 to 125 C temperature range This is important if your microprocessor controlled gadget will form part of an automotive sys tem The processor instruction set is based on a 16 X 16 bit scratch pad organization that provides good programming flexibility The RCA CDP18S020 Evaluation Kit is a relatively inexpensive tool with which to learn about the RCA 1802 prototype a microcom puter system or develop software A 20 mA loop or RS232C terminal is normally required to use th
90. on domestic orders ver 10 MC and VISA accepted 15 m mini j i i in shipping 1 added open queni o r Califermia vernwent entities and large rated firms 95841 SAME DAY SHIPMENT telephone 916 M P IBI m i 4811 Myrtle Avenue Sacramento 95841 CIRCLE 60 ON FREE INFORMATION CARD ADVERTISING INDEX RADIO ELECTRONICS does not assume any responsibility for errors that may appear in the index below Free Information Number Page AMC A we tabe abu 90 56 P Products ehh JU U rmn ar 32 10 Aaron Gavin Instruments 85 19 Active 97 23 Advanced Computer Products 105 69 Advance Electronics 2177 87 37 AM Eleetronicsy _ _ _ 110 30 American Antenna Cov 4 66 AMDO ae 108 35 Austin Electronics 108 57 B amp K Precision Dynascan 82 60 Babylon Electronics 112 Karel Barta u 90 Bullet Electronics TERRA 106 Burdex Security 92 Chaney Electronics 106 8 14 C I E Cleveland Institute of
91. on the plate Hmm there was no DC voltage on video amplifier screen The B was good so was the dropping resistor but hot The screen read ground I clipped the connections but it still read ground on the lead from the dropping resistor Finally I traced this to one stud on a terminal strip the kind of strip with the studs on top of the chasis I looked on top of the chassis and someone had dropped a ring into the set It had hit the terminal strip and the B line had welded it to ground So I removed the ring the set now plays DC VOLTAGE PROBLEMS have an Admiral T3L6 chassis with a blown fuse When I changed the fuse I got 159 volts but none of the other DC voltages do not know where to go from here T T Brooklyn NY Go to the horizontal output stage All the low DC voltages in this chassis are developed by rectifying pulses from the flyback Check the horizontal output and oscillator driver transistors and all the diodes connected to the flybacks for shorts This set may have been hit by lightning Check it over carefully for signs of other damage such as blown resistors or PC conductors HEIGHT LINEARITY PROBLEM losing about inch of raster from the top and bottom on this Admiral model 6K 1668 3 thought this would be easy But after checking the circuit thoroughly and finding all OK not so sure any The cathode and grid voltages slightly off There must
92. one approaches the low and high frequency extremes Nevertheless our policy is to report our readings as we find them in the specific sample tested In fact the results obtained by Hirsch Houck Laboratories and pub lished in Stereo Review are probably more typical of an average receiver As for your more philosophical ques tions may say that stereo separation in excess of 30 35 dB is rather academic in any case The high numbers that we report and that many manufacturers boast about are largely an exercise in engineering perfection and will not audibly improve the stereo image My own feeling is that su perb specs are an indirect indication of serious engineering efforts and do have an indirect if not an audible relationship to the quality of a given piece of equipment am sure that as a practitioner in this field you are also aware that especially at low frequencies actual channel separation be comes even less important since bass tones as reproduced in a listening room are largely nondirectional As for the test equipment both Hirsch Houck Labs and we use you are correct that the guaranteed separation capability of the Sound Technology model 10004 is 50 dB but my own unit is known to be capable of providing an FM stereo signal that has separation in excess of 60 dB across the audio frequency band Just as home audio equipment varies slightly in specs so do individual pieces of test equip ment continued
93. only Orders under 10 00 include 2 00 for shipping handling All components guaranteed or money refunded Immediate shipping N J residents add 5 sales tax MICRO MART e 352 SUMMIT AVE WESTFIELD N J 07090 201 654 6008 CIRCLE 42 ON FREE INFORMATION CARD Data sheets included with each kit DIP SOCKETS B PIN 17 24 PIN 35 14 PIN 20 28 PIN 40 16 PIN 22 40 PIN 60 I8 PIN 25 TRANSISTOR SPECIALS 2N6233 NPN SWITCHING POWER MRF 8004 a CB RF Transistor NPN 2N3772 NPN S TO 3 PRINTED CIRCUIT BOARD 2N1546 PNP GE TO 3 s 5 4 x 6 DDUBLE SIDED EPOXY BOARD 1 16 thick _ 60 ea 5 2 60 7 WATT LD 65 LASER DIODE IR 5895 2N 3820P FET 45 2N 5457 N FET 45 2N2646 UJT S 45 ER 900 TRIGGER DIODES 4 100 2M 6028 PROG UJT S 65 MINIATURE MULTI TURN TRIM POTS 100 1K 2K 10K 20K 50K 200K 1 2Mea 75 each 3 52 00 HAR DUPLE DEVICES CCD 201C 100x100 Image Sensor 95 00 CCD 202C 100x100 Image Sensor 145 00 VERIPAX BOARD _ 16 95 4071 20 Our new Prototyping is a hi density 4 x 6 pest Be 4072 PsC uM 1 05 li single sided 1 16 epoxy board It will hoid 40 0 4076 97 74C175 1 05 24 16 34 units 14 pin IC s There TTL IC SERIES 7447 7549 4029 95 4518 95 74C901 48 three busses 5V ground and a floating buss 7448 3 5492 4030 33 4520 0 74C902 There is a pad for a 220 regulator There is 7400 15 7450 74154 4035 97 74C00 22 740
94. phone included I C Creates almost any type 2 of sound gun shot Only 10 50 e sion train car crash star war birds organ ext built in audio amplifier provides high level output Operates from one 9V battery 28 pin dip supply the datas 2 90 EACH Sub Mini Size PANEL METER 500 UA ONLY 1 20 ea HARD TO FIND 12V RELAY 3 Amp Contact 3 50 Each 15 50 TRANSFORMERS ALL 117 VOLT INPUT COS LIGHT CONTROL SWITCH KIT High Sensitivity Darlington Circuit operated c 4AMP with 9V D C supply to control lights or use 2120 it for burglar alarm shoonng game visitor 48V 3AMP 8 50 EA 1M A movement 1 2 scale length buzzer product counting flashtight slave 24V CT 8 50 EA Scale in VU 20db to 3db Meter 24V CT 0 8AMP 1 80 EA unit of automatic door opener and many S RUE face 5 1 8 x 2 3 8 with a smoke more The poten 12v CT 120 1 25 EA 4 Plastic cover tometer is tO ad AC POWER SUPPLY just the sensitivity SPECIAL and the relay in Wall Type Transformer 11 f 12V Qunur 200 2 15 EA 850 I6 up to 200 I6V 100MA 2 10 EA i 4 50 ea kit watts 6V DC Output 120 5190 EA Each 12V DC Ourpur 100MA 51 30 PUSH BUTTON SWITCH N O
95. project It is excellent method if you have the time and patience to use it but it only works if the projects you want to build are the ones from magazine articles But what if you want to design your own projects or add improvements to the preprinted foil patterns If you don t know how to make your own PC boards or to lay out the PC board itself you are limited Over the past several years I have developed PC construction skills to make my own project boards All my PC construction is accomplished on a one to one basis That is in most cases you will only require one or two printed circuit boards You are probably not going to offer the boards for sale What you re looking for is a reliable and sturdy base for your project and if repairs are necessary the circuit board will not fall apart Besides if your pet project is a good one you may want to write an article on it for publication Submitting the project built around PC boards is far better than a point to point wiring method that is hard to copy and show in an article I want to emphasize that designing your own boards is not a difficult skill to master And with a PC board the project is reliable repairs are easier to handle and tracing problems is much simpler too If you ve ever tried to troubleshoot a rats nest project you know this is in itself a major headache After all you must build it right the first time or you won t get it right at all With PC boards troublesho
96. regulated LM 233 400 M1303 20 Ord 7 70267 6 00 iP 3M x 2 x 1 case with mtng_tabs 2 00 Bader Please specify color amp size Jumbo Medium Small T LM 308H 85 175 Green 7 1 00 Yellow 7 1 00 Red 10 1 00 a Teletype Computer Supplies LM 308 85 LM 1391 2 00 100 13 00 100 13 00 100 9 00 5 sp MO33 RO 248 88 LM 310 80 1 1414 150 with full sized sound at TTY MD35 KSR 388 88 LM 311H 80 LM 1800 70 OPERATIONAL AMPLIFIERS 25 of list price Slight TTY 035 ASR 448 88 LH F UA 7415 25 dents and delaminations 1BM 725 w keyboard 498 88 but so what Includes 9 LM 320 15 110 1 1828 200 BRIDGES 8 woofer 10 passive 898089 LM 320K 12 110 1 1830 225 IM Amp 50 6 Amp 2 00 25 Amp 1 50 rad 3 superhornT MIMB 20 Size 26 H x Nora IBM top terminal 34085 339 100 IM 1889 250 10 1 00 x 11470 Incl damping EE draton ASG 008 68 LM 340M 12 100 LM 2111 115 a cloth Sh wt 80 ibs pr 1 VIATRON s sm 21 495 00 3412 12 80 LlM2ll3 175 IN 41485 ITT 30 1 00 98 0090 88 88 pair Salectric ball printer susie LM 320 207 20 CONDENSE
97. removed from sockets full i I specifications guaranteed 3 95 4PDT e CA3079 zero crossing switch DIL 60 3 24VDC 650 ohms j uA703 VHF transistor array epoxy TO99 30 gt MISC IC s 11605 Fairchild 23Hz divide by 4 120VAC 10 SMA URF scaler 95490 Fairchild 300MH2 decade ctr 2708 1Kx8 bit EPROM 45095 FC0820 Fafrehfld opto isolator DIL 6 75 NL MM I Numeric Display SIGNAL pak of 40 prime or s signa diodes leads are M Single Digit pre trinmed for board specify 1 40 min each type 2 00 GaAsP LED URED Pte ERES Bie to 1N4581 6 4V 0058 reference diode 167 Motorola 16 5 1 zener TRANSISTORS YTEVIMG AMGLE 12Sms PER DIGIT AT TYPICAL Complementary 10 TO 220 pwr trans Magpie ote I 15 BRIGHTWESS LEVELS istors 2N61D1 and GE 04598 80 60V t 75 504 similar betes NM 155 each 10 for 5 95 _ MJE 1091 PWR Darlington T0220 60V M VARO SEMICONDUCTOR 708 Motorola 0106 Ec Y EPOXY RECTIFIERS 101 e 2n4304 N channel FET M 35 40327 RCA 3007 1 AMP SW TO 5 04101 G E PNP 30 1 6w 10 220 30 90 16 fer 7 56 100 365 M4033 MJ4030 NPN PNP dart 103 2 25 126 PNP 10220 darlington mag 75 __ O BOX 41778 SEND FOR FREE FLYER TODAY 5 minimum order add 1 handling charge to orders Sacramento ini than 10 We pay post or UPS
98. required lor operations 4 1 XC2096 POLARITY Common Anode red 5 x 7 Dot Matrix red Common Cathode red Common Common Anade green Common Anode yellow Common Anode red Common Cathode red Common Anode yeliow Common Cathode yellow Common Anode orange Common 1 300 Common Cathode orange Common Anode orange Common Cathode orange Common Anode red Common Anode red 1 Common Cathode red Common Anade yellaw Common Cathode yellaw Common Anode orange D D 560 Common Common Cathode orange D D 560 Common Cathode orange 1 560 Common Anode orange Common Cathode orange Common Anode red D 0 RCA LINEAR C 3082M 2 00 1 FULL 8 BIT LATCHED 19 KEYBOARD The 16600 Encoder Keyboard provides separate hexadecimal digits produced trom sequential key entries 0 allow direct prog ramming for 8 bit microprocessor or B bit memory circuits Three 3 additional keys are provided tor user Operations with one having a bistable output available The outputs are latched and monitored with LED readouts Atso included is a key entry strobe 559 95 ait 125 dla 4191 XC209R red DISF PLAY LEDS HT 270 300 125 187 300 300 300 300 300 300 300 300 300 400 400 400 400 400 400 1 560 560 560 560 CA3083N 50 5725 CA3086N 85 5738 C 3089M 3 75 0M8864 CA3130T 1 39 OMB
99. sometainc illogical we ve included reverse polar ty and short circuit pro tection as well It s smart ta save time wit a DP 1 At S74 95 it s a smart buy tco Smarter tools for testing and design CORPORATION 70 Fulton New nan CT 06509 203 624 ET TWX 710 465 1227 OTHER OFFICES San Francisco 415 421 8872 TWX 910 372 7992 Europe CSC UK _TD PBone Saffron Walden 0799 29682 817477 Canada Len ntler Ltc Ontario Call toll free for details 1 800 243 6077 Im specifications subect to change without 1979 Continental So2ecalties Corporatior CIRCLE 16 ON FREE INFORMATION CARD TBI mm I mI ___ i Don t take our word for it can heartily recommend the Superboard II computer system for the beginner who wants to get into microcomputers with a minimum of cost Moreover this is real com puter with full expandability Popular Electronics March 1979 Their new Challenger 1P weighs in at 279 and provides a remarkable amount of com puting for this incredible price Kilobaud Microcomputing February 1979 Over the past four years we have taken delivery on over 25 computer systems Only two have worked totally glitch free and without adjustment as they came out of the carton The Tektronic 4051 at 7 000 the most expensive computer we tested and the Ohio Scientific Superboard
100. still had more data 0020 1234 5678 9ABC DE10 2938 4756 0000 0000 to enter but wanted to continue on the next 2M8CO0 20 line With the comma the data continues in 8 00 DODO 8C02 FF00 814F 9401 804A 8000 EF82 suenos aad At the end of the third line I decided to go a FA24 FF66 FF02 7F00 80EF 0000 2800 8000 back and till in data starting at OOOF so I used the semicolon again Finally at the end of line 4 simply used SPO100 _ _ 32 FIG 1 volts at 600 mA or 10 volts at 200 mA with a NEW FROM LEADER separate 5 volt 400 mA supply for the LED s yam High Performance Kit assembly was pleasantly uneventful with 5 the help of a high quality double sided PC board with plated through holes Close PC OW t 1 Z runs are necessity on microcomputer boards 1 and careful soldering and inspection tech niques are a must Sockets are provided for the microprocessor and utility IC 7 but as losco S always I recommend using additional sockets a or Molex pins to mount some or all of the remaining 22 circuits 5 2 The checkout procedures consists of mea suring the resistance of the supply input leads Ee and loading and executing a four instruction program that sets and resets flip flop Q Modell B0 513 Figure demonstrates the writing of data to 1 Single Trace memory the rea
101. that the present stereo signal generators are inadequate for the stereo separation mea surement of tuners in the very near future Because am faced with this problem so often came to think why not measure the separation with the dynamic signals in stead of the static sinewave as a modulat ing signal It could be done by tone bursts for instance A dynamic test signal could reveal some deficiencies of the tuner cir cuits that are not readily detected by using the static signalis Furthermore since the music signal to be received contains tran sients and is dynamic in nature the use of a dynamic test signal in the tests is highly justified if for any reason it would be more appro priate to go on testing the stereo perfor mance in an ordinary manner then it might be a good idea to shift from using a so called switching type multiplex generator which the Sound Generator model 1000A is to a matrix type generator Then test signal separation values of 55 dB or more from 20 Hz 15 kHz are available LEO BACKMAN Helsinki Finland If you will examine the actual separation response curve of the FM section of the model R 1120 stereo receiver as shown in the test report you will note that maximum separation of this particular sample receiv er occurred almost exactly at 100 Hz Admittedly this is most unusual since in most receivers and tuners we test maxi mum separation occurs at mid frequencies and tends to decrease as
102. the required count for that column Each column indicates a measure of time in a binary coded decimal BCD format In each column the bottom LED represents the decimal count of 1 the next LED above it represents a count of 2 the next one above is 4 and the next one above in three columns that have one repre sents 8 Suppose the time 15 11 05 29 11 hours 5 minutes 29 seconds as shown in the photograph Since a lighted LED represents the decimal number just described the five rows reading from left to right have the following LED s on during that second col umn hours 1 2 amp 8 column 2 10 of Now more than ever 5 m z _ _ a pa T m verted to electrical enerav Rut tha minutes none column 3 minutes amp 4 column 4 10 s of seconds 2 column 5 sec onds 8 amp 1 It s fascinating to watch the seconds count in this unconventional manner with the minutes advancing right on cue up to 11 59 59 and then repeating This clock does not display in a 24 hour format This may sound very complex to those of you who are unfamiliar with digital electron ics however the Graymark instruction manual guides you through each stage step by step This manual was written by George F Martin Graymark s director of engineering and R L Kall of the engineering staff and reflects consi
103. the am 100MV DC F S sensitivity 19 ranges and functions e D C volt 0 1 MV to 1000 V AC volt 0 1 V to 600 V e Resistance 0 1 210 20 D C current O01 100 MA Ali Boards are made of High Quality G10 Fiber glass and Phenolic Pre drilled in 042 diameter holes on 0 1 centers with tin plated copper OUR PRICE 71 45 phfier Just hook up with the speaker output IN KIT FORM 18 50 eyelet and finger edge connectors single sided to aliow any kind of standard components to fit board ELECTRONIC tice DUAL SPEAKER PROTECTOR Part No Size Holes Fiberglass Phenolic Cut off when circuit is shorted o Over USP 723 2 2 8 529 1 27 50 load to protect U S P 724 28 x 39 750 2 42 80 yOur amplifier as Use 725 37 5 1500 4 89 1 38 well as your speak U S P 728 7 x9 66 6240 19 50 10 40 d ers must for ere 35 x 6 1 70 H 561 3 6 170 A Mis H 5606 3 x 5 150 H 5602 2 x 6 1 50 S8 75 EA BUTTON CELL NI CD RECHARGEABLE BATTERIES 225MA hr 1 2V per cell 7 8 3 8 Single Celt 1 2V 1 20 4 cells stack 4 8V 4 80 5 cells stack 6V 6 00 special voltage order accepted at 1 30 per cell rate FM WIRELESS MIC KIT It is not a pack of cigarettes IL is a new FM wireless mic kit New design PC board fits into a plastic cigarette box case included Uses a con densor microphone to low you to have a better response in sound p
104. the meter overlay Fig 8 can be cut out and glued with rubber cement to the face of the meter This will result in a neat professional appearing project Use extreme care when disassembling the me ter to prevent damage to the delicate meter movement and needle In the prototype Cardiotach the on off indicator LED D7 was not used this LED is optional and can be omitted if you wish If the LED is not used eliminate R34 from the PC board SOLDER RESISTOR PC BOARD DETAIL OF RESISTORS M10 amp R20 AS USED FOR TEST POINTS 1 amp 2 FIG S TEST POINTS consist of 10 ohm watt resistors soldered upright on the board An experienced builder NEVER marks or covers a meter scale Instead he turns the dial plate over and cements the new scale on the back Editor Resistors RIO and R20 are end mounted watt resistors at test points 1 and 2 Cut the lead on one end of each resistor to 2 inch and form it into a loop then solder the other end of the resistor snugly against the PC board as in Fig 9 Any low value resistor can be used or even a piece of bare wire however a resistor tends to be a sturdier test point Resistor R37 was added after the PC board was designed You will have to break the foil between the 12V supply and trimmer R24 to add the resistor You can omit R37 but then it becomes a little tricky to adjust R24 properly A DPDT switch and calibration resis tor could be added to t
105. unusual indoor AM antenna shown in Fig 3 This true loop anten na proved to be somewhat more sensitive than the usual straight stick type and it can be mounted on the rear panel or on any conve nient nearby surface since its bracket is coated with self adhesive material While a 75 coaxial connector is provided for unbalanced FM transmission lines the connector is a nonstandard unit Yamaha supplies a mating male connector that can be easily attached to incoming coaxial cable without any soldering Three convenience AC receptacles are also included one switched two unswitched Fig ure 4 shows how additional high fidelity com ponents could be combined with the Yamaha model CR 2040 Construction and circuitry An internal view of the chassis is shown in Fig 5 An unusual feature of the layout is the use of flexible cables that couple several of the front panel controls to multiple position slide switches that are physically close to the cir cuits they handle thereby reducing the possi bility of hum and noise pickup substantial section of the chassis contains large heat sink structures housing the power transistors while TABLE 1 RADIO ELECTRONICS PRODUCT TEST REPORT Manufacturer Yamaha FM PERFORMANCE MEASUREMENTS SENSITIVITY NOISE AND FREEDOM FROM INTERFERENCE IHF sensitivity mono uV dBf Sensitivity stereo uV dBf 50 dB quieting signal mono uV dBf 50 dB quieting signal ster
106. use the brush and resist direct application method but it took a period of time to master I will try to pass on some of the techniques and time savers I use in future article but the skills you will have to master yourself You can do it R E conductor see Fig 1 This can represented as the circuit shown in Fig 2 with the heat source as a voltage generator and the temperature probe as a high impedance voltmeter The substrate on which the semiconductor is mounted 15 a good insulator and is represented by a high resistance Heat losses through radiation from the enclosure are represented by a resistance and the heat capacitance of the enclosure by a capac itor The temperature probe has similar losses the object is to reduce these losses to a minimum Figure also shows the design of a typical probe with a temperature element mounted in a metal tip isolated thermally from the rest of the probe Again there are heat capacitance and resistive heat losses and a resistance attributable to the temperature gradient across the tip One further problem is trying to make a good thermal contact with the object being measured so contact resistance also has to be noted An efficient design The design of a probe has to take all these points into account The probe tip must be as small as possible to reduce heat resis tance and capacitance to a minimum and it must be well insu lated from the rest of the probe to reduce heat loss
107. with 0 1 C resolution must be used to calibrate the sensors at each end of the selected span An accurate clinical thermometer can be used over the clinical range however note that it tends to inte grate the temperature from the tissue with which it is in contact along its length while the ADS90K measures the temperature of the point it contacts Accurate glass thermometers with 0 1 resolution are available from most labora tory supply distributors for under 525 however they are very fragile and require that a specific length of thermometer be immersed for accurate measurements The glass thermometer should be used in a well stirred water bath in order to C II brate the sensor probes R E ELF I by Netronics FE COSMAC CPU Own a powerful home computer system starting for just 99 95 3 price that gets you up and running the very first night with your own TV for a video display 99 95 ELF II includes 1802 8 bit microprocessor addressable to 64k bytes with OMA interrupt 16 registers ALU 256 byte RAM lull hex keyboard two digit hex output display stable crystal clock lor timing purposes RCA 1861 video IC 10 display your programs on any video monitor TV screen and 55 plug in expansion bus less connectors to expand into a giant ELF II Explodes Into A Giant Master ELF I s 99 95 capabilities then expand with GIANT BDARD KLUGE BOARD 4k RAM BOARDS TINY BASIC KEYBOARD LIGHT PE
108. you can use it in adjusting for minimum distortion Adjust R223 for 16 volts P P out put Switch the scope to DC input Adjust R222 for zero offset Set S5 to TRIANGLE Check the waveform quality at each position of S3 At the 10K position the waveform will be distorted however this is not too important because this position is used only to trigger the pulse genera tor For initial checks on the low frequency ranges set R to 100 Any deviation from strict linearity indicates capacitor leakage A slight curvature of the wave form is acceptable for most applications However if curving is severe the circuit may not oscillate at all at low currents For testing at the lowest positions of 53 set the scope s horizontal timebase for external sweep This will produce just a vertical trace Follow the oscillator through a couple of cycles to insure that there is no excessive leakage At the 002 position of S3 a single cycle takes approx imately 8 minutes If the scope beam stops while approaching one peak in crease R1 slightly to increase the charg ing current The beam should advance slightly This action indicates excessive leakage in the capacitor involved Increas ing R1 beyond some point should cause oscillations to resume Replace the faulty capacitor Set R3 to maximum Set S9 to MANUAL Set R4 to O Set R206 to 0 output Move R4 to 5 volts Set R209 for 8 volts output Move R4 to 5 volts The o
109. 0 up 7410M 17 LM703H 40 switches Very compac wih 50 and 7414N 63 LM709H 28 74604 33 1 020 25 00 84 digits 7420N 17 M723H N 50 74010 CDP1861 12 95 MA10024 C or E 50 8 35 7422N 139 LM733N 67 2 28 6820 9 05 10263 Transtormer 2 25 7430N 20 LM7410H 35 74C20 28 6850 12 95 MATOOA C or E 84 11 95 a 74630 28 6502 12 50 102P2 Trantiormer 2 25 74048 3 95 Special transformer and stz 7447N 60 LM748N 7448N 6 LMI nC 75 Sager ta Lo 74C76 1 40 wimo bie 2 95 7450M 17 LM1304 1 10 74690 15 10 PIN 1UP 1003 car module 3 SN 2 v 2 2 2 gt green Huor disptay 15 95 7485M 8 1310 2 75 T 18 1 28 42 7489 200 LM1458 ar 1 2 3 58 noc 012 7490M 43 1 1800 177 740192 166 20 29 40 57 25 per 025 358 piece pack EN E i mee 2 100 per type 015 per type 6 75 7495M 69 LM211 me level 14 pin ww 20 KEYBOARDS 74100M 90 LM2902 1 50 56 key ASCII keyboard III 57 50 Cosmac Super Elf Computer 106 95 74107N 29 LM3900N 60 PD WIRE WRAP LEVEL 3 Fly cca 77 50 Compare features before you decide to buy any tect monitor select and single step Large on M 2 E 74092 5 50 ak TUN cone other computer There is other computer on board displays provide output and optional high 74125M 39 2 740926 16 3 2 100
110. 0 100 db in 20 db steps per Rotation increasing attenuation in CCW direction pac 6 position 45 throw with stops at each end of rotation 3 bacs Impedance 50 ohms 8 00 Insertion Loss gt 0 5 Fantastic assortment of ALLEN BRADLEY and Range DC to 1 GHz STACKPOLE resistors 1 8W 1 4W 1 2W 1W Power 0 5 watts and 2W resistors 11 with full length leads 5 Accuracy 0 5 db from DC to 500 MHz assorted values for less than 2 cents per resi stor Color code for easy identification of resis tors is included TOTAL of 160 pieces must for your workbench and lab kits No 8899R 5126 RF Connectors 1 0 db from 500 MHz to 1 GHz SMA Jack recePtacle 1 7 8 diam x 7 16 long COMPUTER GRADE CAPACITOR SALE D d COMPUTER GRADE capacitors have just about idisappeared from the market We have come a cross highly desirable lot Allin the new small size configuration Allare either GENERAL ELECTRIC or SPRAGUE Powerlytic 5 values Deita Mfd diam Sale 4for 2780R 5800 40V 13 8 x 31 8 2 75 10 2781R 8400 40V 2 x 31 8 3 25 12 2782R 12000 40V 2 x 4 3 50 13 2783R 19000 40V 2 x 4 4 00 15 2784R 2500 75V 13 8 x 44 3 50 13 NM E MEE A 56428 VE REDUCED T gt RADIO ELECTRONICS M Tested AA When in our area northeastern Mass or sou
111. 0 2 90 25 489 110 125 1 40 258 381 30 35 40 25C 711 20 27 30 2 5C 1306 130 145 1 60 250 300 450 500 5 60 254 490 70 80 90 258 400 30 35 40 2SC 712 20 27 30 25C 1307 1 90 210 230 250 313 60 70 80 25 493 45 53 59 258 405 30 35 40 25C 715 30 35 40 25C 1310 20 27 30 2SD 315 60 70 80 2SA 495 30 35 40 258 407 80 90 1 00 2SC 717 35 40 45 2SC 1312 20 27 30 2SD 325 60 70 80 25 496 50 64 70 258 415 30 35 40 25C 727 100 120 1 30 25C 13136 20 27 30 250 330 60 7C 80 254 497 100 1 20 1 30 258 433 80 90 1 00 25C 730 300 320 3 40 25C 1316 420 440 490 256 350 380 400 4 40 25 505 50 64 70 2SB 435 90 110 1 20 2SC 731 250 270 290 2SC 1317 20 27 30 2SD 380 520 540 5 95 2SA 509 30 35 40 2SB 440 40 53 59 2SC 732 20 27 30 2SC 1318 35 40 45 2SD 381 85 100 110 2SA 525 50 64 70 258 449 1 30 145 1 60 25C 733 20 27 30 25 1325A 650 690 760 256 424 380 400 4 40 2SA 530 50 170 1 90 258 461 90 110 1 20 2SC 734 20 27 30 25C 1327 20 27 30 250 125 290 3 20 3 40 2SA 5374 150 170 1 90 258 463 90 1 10 1 20 2 735 20 27 30 25C 1330 50 55 60 250 426 310 330 360 254 539 40 45 50 258 471 1 10 271 25 140 25C 738 20 27 30 25C 1335 50 55 60 250 427 180 200 225 2SA 545 45 53 59 2SB 472 210 250 2 80 25C 756 150 180 200 25C 1342 45 53 59 250 525 90 110 1 20 254 561 30 35 40 258 473 80 90 1 00 2SC 756A 150 180 2 00 4 2SC 1334 45 53 59 250 526 60 70 80 25 562 30 35 40 258 474 70 80 90 25 763 35 40 45 25 1358 4 20 440 490 2SK 19BL 50 55 60 2SA 564A 20 27 30 258 481 90 110 1 20 2SC 77
112. 1 right hand decimal point 21 7805 5 volt regulator IC2 NES555 timer IC3 7905 5 regulator IC4 ICLT107CPL 3 4 digit CMOS A D converter Intersil IC5 1206 AD590K temperature sensor Analog Devices 27 LM329DZ precision Zener 6 9 volts Miscellaneous 51 53 minlature slide switch 54 miniature toggle switch SPDT Power transformer 9 volts AC 300 mA plug type with molded plug Socket 40 pins DIP Socket 8 pins DIP 41 J2 phono jacks PC mount J3 pin type power receptacle to match power transformer Case assorted hardware The following kits lor the digital ther mometer are available from Optoelec tronics Inc 5821 N E 14th Ave Ft Lau derdale FL 33334 The complete kit for the PDT 580 digital thermometer includes cabinet power supply two probes and all parts except oplional MiCad battery and charger 99 95 The PDT 590 WT wired and tested 159 95 Rechargeable battery option MI CAD 590 includes batteries holder mounting hardware switch and charging circuit used in kit and factory wired models 25 00 Set of PC boards and switches PCB 590 19 95 Extra probe kit P 590K 12 00 exlra assembled probe P 580 15 00 6261 J RADIO ELECTRONICS gt FIG 8 PARTS PLACEMENT DIAGRAM showing locations of most of the components Note that IC3 and IC1 are back to back BATTERY TERMINAL SEE TEXT
113. 1 0 USART 7 95 MM5230N 2048 B t Read Only Memory p fnomer Moen ole H Ha a and quads gt Prog DIM 14 a addition It is free of critical adjustments and is built with non precision readily available 4 rog Periph 1 0 PPI 9 95 parts safely and automatically 8257 Prog OMA Control 19 95 1101 256X1 Static 5 49 Data Transmisston Method Frequency Shitt Keying 01 hait duplex Iowa medium and Pigh Prog Interrupt Control 19 9 1103 1024X1 Oynamit 39 Peer cr my Sire gw x Gn go D 6800 6800 SUPPORT OEVICES 210108101 256X4 3S Ota ert o B ai MC6800 14 95 2102 1024X1 Static 1 75 e Asynchronous Serta return to mark level require between each character Receive Channel Frequencies 2025 Hz for space 2225 Hz mark Transmit Channel Frequencies Switch selectable Low normai 1070 spate C cell battery not included Trans Check 529 95 ea MC6802CP MPU with Clock and Ram 24 95 21102 1024X1 Static 1 95 6810 128X8 Static Ram 5 95 2111 8111 256X4 Static 395 MC5821 Periph Inter Adapt MC6820 749 2112 256 4 Static MOS 4 95 MC6828 Pnonty Interrupt Controler 1295 2114 1024X4 Static 45015 9 95 anatia sendit a A i m 2225 mark 8 3018 1024 8 ROM MC68 30 8 14 95 21141
114. 1 999 volt range and so when the scaled output voltage falls below the reference voltage a negative temperature is indicated Because the input voltage is 10 mV per degree Celsius or Fahrenheit the decimal point is placed between the l mV and 10 mV digits to obtain a degree C or degree F readout The complete schematic is shown in Fig 4 The DVM is built around In tersil s 7107 analog to digital A D con verter IC The 7107 uses the dual slope AD590K 273 2 OUTPUT 10MV K SCALING OR R RESISTORS FIG 2 SCALING RESISTOR adjusted to give Kelvin and Rankine proportional voltages i hh x mi i integration method of conversion and autozero and a true differential input it measures the net difference between volt ages applied to its input high and input low terminals The A D converter contains amplifi ers buffers analog switches a compara tor a clock oscillator counters latches and LED segment drivers In the first KELVIN Vout 2 732V 10K SCALING RESISTOR 10MV 1 of a measurement cycle the A D converter internally shorts the inputs and charges autozero capacitor C15 to com pensate for the amplifier and integrator offset voltages In the next phase the integrator output voltage increases at a rate that is proportional to the unknown input voltage for a fixed number of clock pulses In the f
115. 1024X4 Static 450ns iow power 10 95 Lavel ae remi ao MC6850 Asynchronous Comm Adapter 795 2114 3 1024X4 State 300ns 10 95 030991 MC6852 Synchronous 5 Data 9 95 2114 3 1024X4 Static 300ns tow power 11 95 MC6860 0 600 bas Digital MODEM 12 95 5101 256X4 Statlc 7 95 MCB862 2400 bps Modulator 14 95 5280 2107 4096 Dynamic 4 95 Receive Frequency Tolerance Frequency reterence automatically adjusts to allow for operation between 1800 Hz and 2400 Hz Digital Data Interface RS 232C or 20 mA current loop is a MCB880A Quad 3 State Bus Trans MCBT26 225 7489 16X4 Static 1 75 5 ptoisolated and non polar Seri Cabl MICROPROCESSOR CHIPS MISCELLANEQUS 2801 Tnstate ie Power Reguirementr 120 VAC single phase 10 Watt DB 25 Series Cables 280 7800 CPU 19 95 aK 495 1 Physical enses components mount on a Single 5 by 9 Part Cable Length Connectors Price 2804 780 1 CPU 24 95 MK4027 Y printed circuit board components mcluded DB25P 4 P 4 Ft 2_DP25P 15 95 ea A 19 95 046 16K Dynamic 16 pin 9 95 L Hequires VOM Audio Oscillator Frequency Counter and or Oscilloscope to align MPU 1
116. 15 volts uses 3 45 ohm speaker Ramsey s famous MINI KITS 567 125 7912 3900 50 TTL ICs CMOS ICs 74500 4011 20 7447 4013 35 7375 4046 185 7490 4049 40 74196 4518 1 25 SPECIAL ICs 5369 75 11090 TRANSISTORS 10116 2N3904 type 10 00 4511 243906 type 10 7 00 5314 NPN 30W Fwr 3 00 5375 PNP 30W Pwr 377 00 7001 2N3055 60 4059 UJT 232645 type 3 200 7208 FET MPF1C2 type 3 2 00 LEDs UNF 2N5179 type 3 2 00 Jumbo red MRF 238 2 1 95 Jumbo green SOCKETS Jumbo yellow B pin 10 2 00 Mini red 14 pin 1072 00 Micro red 16 pin 10 2 00 BiPolar 24 pin 4 200 FERRITE BEADS 28 pin 4 3 00 With info 5 3 2 00 amp nole balun Complete kit BL 1 2 95 Complete kit SM 3 2 95 c TEAMS Satstactian guaranteed or Money Hi li Hi L i L PHONE ORDERS CALL refunded COD ads 50 Minimum order D 5 00 Orde s under 10 00 add 75 Add 71 6 271 6487 5 for postage insurance handling Over 4072 ROCHESTER N Y 14610 seas add 1 5 NY residents add 7 tax 3 99 CIRCLE 39 ON FREE INFORMATION CARD ICRO 552 Summit Ave Westfield N J 07090 201 654 6008 ELECTRONIC SUPERMARKET Your Source for Surplus Electronic Values INPUT 115 VOLT ai 16 HZ A TIL 7403 12 74H53 20 REVOLUTIONARY NEW CHIP e 49 95 74H04 20 7474 25 LI
117. 2 Color TV video modulator MC6821 Peripheral interface adapter MC6808 Microprocessor with clock MC6846 Rom 1 O Timer MC6847 V ideo display generator 6850 Asynchronous communications interface adapter Also includes printed circuit board and data sheets on all above mentioned LSI 129 AND WE 28 GOT Electricity from the sun GIANT 3 inch cell delivers 1 amp 8 50 Giant cell w special motor amp propellor 10 25 SOLID STATE power supply 12 VDC 15 amp 40 00 SOLID STATE power supply 5 35 amp 50 00 Above supplies unused in original cartons Operate from 115 volts AC 60 cycle Made for computer work Solid state filtered regulated over voltage protected ULTRASONIC room alarm intrusion detection with full data for hookup EE SEE IN THE DARK IR viewer complete ready to operate Guaranteed by the manufacturer Portable runs on lantern battery New see in total darkness MICRO MOTORGLAS MICROPROCESSOR TD TELEVISION INTERFACE CHIP SET 1 n A 3 We at Austin Electronics went one step all support devices These parts for the cult to find and expensive We ve made re THROUGH AUSTIN ELECTRONICS IN STOCK AND NOW AVAILABLE THE PARTS KIT further and put together a parts kit of average enthusiast would be very diffi it easy and substantially less expensive Bug kit II comes complete with all
118. 2 Damping Factor 40 IM Distortion 0 02 Frequency Response ail inputs 20 Hz to 20 kHz 0 2 dB Input Sensitivity MC phono 100 uV MM phono 2 5 mV high level 120 mV S N Ratio A weighted referenced to full output phono MC 88 dB referenced to 500 uV phono MM 95 dB referenced to 10 mV high level 100 dB Bass and Treble Range see text 10 dB Midrange Control 6 dB Low Filter Cutoff 3 dB at 25 Hz High Filter Cutoff 3 dB at 6 kHz or 10 kHz Loudness Control Range 20 dB Audio Muting 20 dB GENERAL SPECIFICATIONS Power Consumption 600 watts 120 voits 60 Hz Dimensions 223 6 W X 6 As H X 16 inches D Weight 44 Ibs 14 oz Suggested Approximate Retail Price 850 Radio Electronics Audio Lab Tests Yamaha Model CR 2040 D AM FM Receiver LEN FELDMAN CONTRIBUTING HI FI EDITOR TS E RADIO ELECTRONICS AUDIO LAB SOUND masa R AT E Saw YAMAHA CR 2040 RECEIVER EXCELLENT Copyright 6 Gernsback Publications Inc 1979 The top of the panel contains a softly illumi nated pair of frequency AM and FM scales to the left of which are a red power on light a green half power light and a red overload light that illuminates whenever the amplifier is driv en beyond its rated output capability Six small indicator lights to the right of the frequency scales illuminate to show AM reception stereo FM reception activation of an automatic FM blend circuit local or DX FM opera
119. 2 762 60 00 for European prices a Name Bldg No Job Title or Mailstop 2 Company Le wr If payinq by credit card Address State Province Postal C _ _ Country _ computer products More information on new products is available from manufacturers of items identified by a Free Information number Free Information Card is inside the back cover DISC DRIVE SYSTEM is a dual drive floppy disc system that comes assembled and is S 100 2 80 8080 and IBM compatible System consists of CIRCLE 121 ON FREE INFORMATION CARD two 8 inch drives a Tarbell controller with 4 drive capability and on board PROM bootstrap loader for CP M assembler power supply interface cables and cooling fan The drives offer full 250K byte storage per drive 3 3K bytes per track 8 ms track to track access time and 211 ms average access time Recommended for use with DOS CP M assembler text editor and de bugger System sells for 1995 Electro Ana lytic Systems Inc Box 102 Ledgewood NJ 07852 5 100 BUS ADAPTER MOTHERBOARD model 8700 is available as a kit or assembled and allows interfacing S 100 based devices to a TRS 80 computer to provide memory expansion and extended 1 0 capabilities Built in 6 slot mother board can be set on a tabletop and is connected to the TRS 80 via a ribbon cable optional on board support circuitry and sockets are available for 16
120. 2 30 35 40 25C 1359 30 35 40 3SK 22 140 160 180 25 565 70 80 90 258 492 60 70 80 2SC 773 35 40 45 2SC 1360 50 55 60 3SK 39 90 110 120 2SA 566 250 2 70 300 2SB 507 80 30 100 25C 774 100 1 20 130 25C 1362 35 40 45 35M 40 90 110 120 2SA 606 100 120 1 30 258 509 16 10 1 20 30 2 775 140 160 1 80 25C 1364 35 40 45 3SK 41 1 30 145 1 60 2SA 607 110 125 1 40 258 511 70 80 90 2 776 2 00 2 20 2 50 2SC 1377 3 20 3 40 3 70 3SK 45 130 145 160 2SA 624 70 80 90 258 514 70 80 90 2SC 777 3 00 3 25 3 50 25 1383 30 35 40 AN 203 140 160 1 80 254 627 3 10 3 30 3 60 258 523 70 80 90 25 778 290 320 340 25C 1384 35 40 45 M 2140 150 170 1 90 254 628 30 35 40 258 526C 70 80 90 25C 781 190 210 2 40 25C 1396 45 53 59 239 420 440 4 90 254 634 40 45 50 258 527 90 110 1 20 2SC 783 210 250 280 2SC 1398 70 80 90 237 250 270 300 2SA 640 30 35 40 258 5280 70 80 90 2SC 784 30 35 40 25C 1400 35 40 45 274 150 1 75 195 254 642 30 35 40 258 529 70 80 90 2 785 35 40 45 25C 1402 300 320 3 40 AN 313 3 00 320 3 40 2SA 643 30 40 45 2SB 530 320 330 70 25C 789 80 90 100 25C 1403 3 20 85800 M 315 180 200 225 25 653 190 210 240 258 531 180 2 00 2 25 2SC 790 BO 90 1 00 2SC 1407 50 55 60 BA 511A 180 200 225 2SA 659 35 40 45 258 536 100 1 20 1 30 25C 793 200 220 250 2SC 1419 60 BA 521 190 210 240 254 661 50 64 70 258 537 100 1 20 1 30 2SC 799 2 00 2 20 2 50 2SC 1444 160 1 80 2 00 HA 1151 150 1 75 195 254 663 365 380 4 20 2SB 539 3 20 340 3 70 2SC
121. 200 220 250 25A 706 85 100 1 10 25C 317 40 53 59 2SC 929 20 27 30 25C 1628 60 70 80 STK 011 380 4 00 4 40 254 715 60 70 80 25C 352 2 00 220 2 50 25C 930 20 28 30 2SC 1647 70 90 STK 013 760 8 00 8 80 2SA 719 30 35 40 2SC 353A 140 1 60 180 2SC 941 20 27 30 25C 1667 300 320 3 40 STK 015 420 440 490 2SA 720 30 35 40 2SC 367 60 70 80 2SC 943 35 40 45 2SC 1669 9 0 1 00 110 STK 435 450 500 5 60 25 721 30 35 40 25C 369 88 35 40 25C 945 20 30 25C 1674 30 35 40 STK 439 790 800 8 80 25 725 30 35 40 25C 370 20 27 30 25C 959 1 00 2051 25C 1675 20 27 30 7045M 200 220 2 50 25 726 30 35 40 25C 371 30 35 40 25 971 70 180 90 2SC 1678 110 125 140 7055P 200 220 2 50 2SA 733 20 27 30 2SC 372 20 27 30 2SC 982 70 80 90 2SC 1679 3 00 320 3 40 TA 7061AP 90 1 10 1 20 2SA 738 40 53 59 2SC 373 20 wel 30 25C 983 50 64 70 2SC 1681 30 35 40 TA 7062P 110 1 25 1 40 2SA 740 150 170 1 90 2SC 374 30 35 40 25C 1000 35 40 45 25C 1682 30 35 40 7203P 250 270 290 2SA 743A 85 100 1 10 25C 375 30 1 35 40 2 1012 1 20 140 150 25C 1684 30 89 40 7204P 2 00 2 20 2 50 254 744 420 440 4 90 2SC 377 30 35 40 2SC 1013 50 64 70 2SC 1687 40 45 50 7205P 1 60 1 80 2 00 2SA 745R 380 4 00 4 40 25C 380 20 27 30 25C 1014 50 64 70 25C 1688 35 40 45 7222P 3 40 355 3 90 25 747 420 440 4 90 25C 381 35 40 45 2SC 1017 80 90 100 25C 1708 30 35 40 7310P 130 145 1 60 254 748 70 80 90 25 382 35 40 45 2SC 1018 60 70 80 25
122. 42 J3 2 93 St SS II 50 SH 512910991 811 4 Ste 620619 616 H IM 51 J 518 LOCATIONS DESIGNATIONS ot the controls mounted on the front panel output of IC501 will make fine adjust ments more precise With S9 on sweer run R4 to its lowest position Set the desired low frequency end point by adjusting 59 Move R4 to its upper position and set the upper frequency end point with R8 Recheck the lower end point Voltmeter adjustments Start by calibrating the input attenua tor Set S16 to TIMEBASE Set S3 to 1K Set S5 to SINEWAVE Set METER RANGE Switch S17 to 24 dB Monitor the output of IC610 with the scope Set R4 to 0 Set R3 to produce 3 to 4 volts peak at the output of IC610 Move 81 through its full travel Adjust trimmer capacitor C604 for minimum deviation from the 1 kHz level Repeat the steps outlined above to adjust the appropriate compensating ca pacitors for the 12 through 24 dB positions of S17 Apply a 1 kHz sinewave simula neously to pins 2 and 3 of mike jack J6 Set 517 to 72dB Monitor the output of C610 while adjusting trimmer resistor R604 for minimum output This adjusts the common mode rejection for the mike preamp AC to DC converter The following procedure is for setting up the AC to DC converters Set the METER RANGE Switch S 17 to dB Set S16 to TIMEBASE Adjust the timebase section for a 1 kHz 4 volt peak sinewave at the out
123. 470 00 to crystal time base Outstanding accuracy Kit able 375 00 4X version 450 00 4K Assem update service through 1979 Domestic postage 8 16 Eprom Kit less PROMS 89 00 includes PC board IC crystal resistors ca 85 00 8X Basic Interpreter 100 00 3 50 Foreign 5 00 1978 IC Master tloseout Video Interface Kit 139 00 pacitor and trimmer Power supply assembled in case 60 00 19 50 Motherboard 39 Extender Board 8 99 TERMS 5 00 min order U S Funds Calif residents add 6 tax BankAmericard and Master Charge accepted FREE Send for your copy of our NEW 1973 Shipping charges wil be added on charge cards QUEST CATALOG Inciude 282 stamp 1 CIRCLE 21 ON FREE INFORMATION CARD 6 61 Aine MA1003 CLOCK AND CASE SPECIAL 19 95 Easy to build just add 12V DC and time setting switches Includes built in crystal timebase ideal for mobile and portable operation Beautiful blue green fiuorescent readouts Case includes filter and mounting hardware available separately for 5 95 MA1003 module avaliable separately for 16 50 16K MEMORY EXPANSION CHIP SET 109 3 320 For Radio Shack 80 Exidy Sorcerer and Apple machines Compare our features with similar chip sets 250 ns access time DIP shunts included 1 year limited warranty and easy to follow instruc tions that make memory expansion a snap even for beginners X POPULAR ICs XXX AT POPULAR PRICES Low power 2102s for 2 M
124. 49 00 Complete with enclosure power S supply All features of Superboard II Easy to expand to more memory and floppy disk C1P MF 995 00 The first floppy disk based computer system the world has ever seen for under 1 000 8K BASIC in ROM 12K RAM Expandable to 32K RAM OHIO SCIENTIFIC 1333 S CHILLICOTHE RD AURORA OHIO 44202 216 562 3101 See your Ohio Scientific dealer for full details CIRCLE 5 ON FREE INFORMATION CARD 6261 PRECISION Model 935 DIGITAL MULTIMETER 5149 s ACCURATE basic 0 1 DC accuracy better than that of many bench lab DMM s VERSATILE all the functions and ranges you need 29 in all volis amp amps AC amp DC switchable HI amp Lo ohms ECONOMICAL operates up to 200 hours on a standard 9V alkaline battery TOUGH built to take rough everyday field usage and electrical overload yet maintain its calibration HANDY easy to hold to carry to use to read RELIABLE backed by a full 2 year warranty ALSO AVAILABLE Model 938 0 1 3 2 digit CAPACITANCE METER only 149 Ask for details Order Toll Free Call 800 223 0474 oe Q sas Qs wa wai s w sa swscassa ss mw wa ee ee ee WE ELECTRONICS 7 _ e 54 W 45th Street New York 10036 212 687 2224 BASIC SPECIFICATIONS PLEASE SEND
125. 5 0 19 2 50 at 108 OUTLETS Model CR 2040 R E Evaluation Good Very good Excellent Excellent Superb Superb Good Very good Very good Superb Superb Excellent Excellent Superb Superb Superb Superb Excellent Excellent Good Very good Very good Superb Superb Superb Very good Excellent Superb Very good Excellent Excellent Excellent Good Excellent Excellent SPEAKER SYSTEM B AC ANOTHER PIECE TAPE DECK 1 TAPE DECK 2 POWER AMP SPECIALIZED 4 AUDIO EQUIPMENT AUDIO EQUIPMENT 6261 m RADIO ELECTRONICS N tuner circuits and preamplifier stages are as far removed from the power transformer as possi ble The FM front end uses a four section tuning capacitor and is equipped with a juntion FET for the RF amplifier stage The IF section operates in two modes the local wide band mode and the DX or narrow band mode for high selectivity Three uniresonance ceramic filters one discrete transistor stage and a six stage differential JC amplifier with current limiter are used in the local mode while two additional ceramic filters and a second differential amplifier are used in the DX mode An auto DX circuit activates the operat ing mode depending upon the amount of noise and interference present in the received signal addition if stereo signal strength is low a multiplexed blend circuit automatically duces noise whi
126. 508 5 00 NE561B 5 00 NE5628 5 00 NES65N H 1 25 M6566CM 1 75 NE567V H 99 57 4 95 LM703CN H X 69 LM70SN H 29 74L500LIL 74L547 74L551 39 74L554 29 74L555 29 741573 45 741 74 45 741875 59 74 876 45 74 878 49 741 583 89 741585 1 25 741586 45 741590 59 74 892 75 74593 75 741895 99 741596 1 15 74L5107 45 74L 109 45 7415112 45 7415123 1 28 7418125 69 7415132 99 74L5136 49 7400 emm M74160M SN74161N SN74162N SN74163N SN74364N SN74165N SN74166N SN74167N SN74170N SN74172N SN74173N SN74174N SN74175N SN74176N SN74177N SN74179N SN74180N SN74181N SN74182N SN74184N SN74185N SN74185N SN74188N SN74190N SN 4191N SN74192N SN74193N SN74194N SN74195N SN74196N SN74197N SN74198N SN74199N SN745200 SN74251N SN74279N SN74283N SN74284N SN74285N SN74365N 5N74366N SN74367N SN74368N SN74390N SN74393N CD4070 CD4071 C04072 CD4076 604081 604082 C04093 CD4098 MC14409 MC1t4410 MC14411 MC14419 MC14433 MC14506 MC14507 MC14562 MC14583 CD4508 CD4510 CD4511 CD4515 CD4518 04520 CD4566 74C163 74C164 740173 740192 740199 740195 740922 740923 74C925 740926 80695 80697 LM710M LM711M LM723N H LM733N LM739N LM741CN H LM741 14N LM747N H LM748N H LM1310N LM1458CN H MC1488N MC1489N LM1496N LM1556V MC1741SCP LM2111N LM2901N LM3053N LM3065N 89 89 1 95 1 49 1 49 4 95 1 79 79 2 25 3 95 3 95 69 69 69 69 1 95 1 95
127. 6 06 Auto Clock Kit 15 95 DC clock with 4 50 displays Uses National MA 1012 module with alarm option Includes light dimmer crystal timebase PC boards Fully regulated comp instructs Add 3 95 for beau tiful dark gray case Best value anywhere RCA Cosmac VIP Kit 229 00 Video computer with games and graphics Digital Temperature Meter Kit Indoor and outdoor Switches back and forth Beautiful 50 LED readouts Nothing like it available Needs no additional parts for com plete full operation Will measure 100 to 200 F tenths of a degree air or liquid Very accurate 39 95 Beautiful woodgrain case w bezel 11 75 M ulti volt Computer Power Supply 8v 5 18v 5 amp 5v 1 5 amp 5V 5 amp 12v 5 amp 12 option are regulated Kit 29 95 Kit with punched frame 34 95 Woodgrain case 10 00 Video Modulator Kit Convert your TV set into a high quality monitor 5v 12 8 95 Stopwatch Kit Full six digit battery operated 2 5 volts 26 95 3 2768 MHz crystal accuracy Tynes to 59 min 59 sec 99 1 100 sec Times std split and Taylor 7205 chip all components minus case Full instructions Hickok 372 Digit LCD Multimeter without affecting normal usage Complete kit with full instructions 2 5 MHz Frequency Counter Kit Complete kit less case 37 50 30 MHz
128. 6 6 1 77 1019 4 000 L VI II6I0 890 5501 yo V e aseo e 9 037 9 I e 6666 9 19 WOJ sounseay e suizebey S21004129 3 8 61 1995 08I 8 e 1 818V V C1I2 6 C2 C1 6 VM 14 YON Spio ejeguepne7 pue 06V6 39 19 2 AIO amp me tcl 966 877 0 I Wddl 0 98558 OXOL U0 SIO81d 0 OX91 CE EN ere ot 1951802 pue 0V IM 04 QVO IN Z Yed OV OL OVH 96666 _ wod 154 70002 0180 en gt MM 198 peiquiessy 0002 0140 piepue1S 5 68I 0 5 e 0 e ejeo 92895 01 1 295 e sinduiuuuO OS 9 2 1 ese uinuluiniy e 2 Wdd80 9558 OXO D IV IX e ZHN 009 01 ZH OL MC BEL HEP MIS 85952 5112350 QvO IN 08 QVO IN 3 Ctt genter temm eojueJent syed 198 XV 0008 01940 SEO 6768 eejuesent 1808 Z peiquessy VI012 5 1 0008 130 5ununoo asjey 001X OLX LX 40jenueje uonisod 2924 e 5 2 e BSED unuiun y e e ZHW 009 amp AW OS ZHN 051 O AU 0 gt 5 WYO OS 9 Z IH
129. 618 Phone 312 583 6565 AMAZING ELECTRONIC PROJECTS and PROOUCTS Lasers Super Powered Burning Cutting Rifle Pistol Pocket See in Dark Shotgun Directional Mike Unscramblers Giant Tesla Stunwand TV Disrupt er Energy Producing Surveillance Detection Elec trifying Ultrasonic CB Auto and Mech Devices Hun dreds More All New Plus INFO UNLTD PARTS SER VICE Catalog 1 Information Unlimited Dept 88 Box 716 Amherst N H 03031 BIG SCREEN OSCILLOSCOPE Converted from ANY Size TV Set Hams Technicians Hobbyists Broadcasters Minor inexpensive changes convert TV set to super sensitive testing device No electronic ex perience needed Follow clear cut plans Fully illustrated Use in workshop lab school etc Any size screen size TV set zu Complete Set of Plans INCL 50 FOR POST 8 HANDLING MILLCO IND DEPT OP 03 BOX 91 KOSSE TX 76653 Radio Shack No 1 Parts Place Low Prices and New Items Everyday Top quality devices fully functional carefully inspected Guaranteed to meet aii specifications both electrically and mechanically All are made by well known American manufacturers and all have to pass manufacturer s quality control procedures These are not rejects not fallouts not seconds In fact there are none better on the market Always count on Radio Shack for the finest quality electronic parts TTL and SN 76477 Sound Music CMOS Logic ICs
130. 75 2000 mfg 230 another exclusive from Quest It includes register 12 50 for easy connection between the Super E 3 ED 20 m 2 2 1 save and readout block move capability and Elf and the Super Expansion Board 13 508 425 8216 US 100 5800 300 video graphics driver with blinking cursor Break power Supply Kit for the Super Expansion LM3407 5 1 25 04511 8228 535 Connectors 15232 6100 SV 300 points can used with the register save feature rdi 2 M 282 90 ES Em cara 250 ini Board is a 5 amp supply with multiple positive LM340T 12 1 25 CD4516 1 10 68253 10 00 D825P 2 95 55 2 50 0 isolate program bugs quickly then follow with LM340T 15 1 25 CD4518 1 02 8255 9 25 08255 3 95 10000 20 250 ace ie The S Ganiter th and negative voltages 29 95 Add 4 00 for LM340T 18 1 25 CD4520 102 8257 950 Cover 1 50 12000 30 350 Ingle 5160 e Super Monitor is written wit shipping Prepunched frame S5 00 Case LM3401 25 125 C04527 51 8259 19 50 5232 Complete Set 6 50 35000 25v 5 00 subroutines allowing users to take advantage Of 610 00 1 gt gt c 150 8 rue r 1 50 55000 500 50 for shipping LM350 7 50 CD4553 350 18020P plas 17 95 095 1 95 82000 600 monitor functions simply calling them LM370 115 04566 225 1861P 1 50 DAISP 210 60000 40V 6 00 LM377 3 00 CD4583 4 50 CDP1802CD 995 DA15S 3 10 76000 atv 6 00 120000 10V
131. 7805 regulator and check for 10 6 volts to 11 volts If the voltage is below 10 6 then increase R3 to 180 ohms or 200 ohms to raisc the posi tive supply voltage With the negative DVM lead on pin 2 of the 7905 voltage regulator connect the positive lead to the center lug of trimmer resistor R6 and adjust R6 for 1 000 volt Next connect the positive lead to the center lug of trimmer R9 and adjust R9 for a 2 73 volt measurement Then con nect the positive lead to the center lug of R12 and adjust R12 for 4 59 volts The sensor probes are easily calibrated using the boiling point and freezing point of water for reference To achieve 0 6 C accuracy or better the sensor probes should be calibrated at both points and the error should be evenly split between them For instance if the meter is adjusted to read 0 0 C at the freezing _ 601 mM ET he 05 I 50 40 30 20 10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 TEMPERATURE C FIG 12 SENSOR NONLINEARITY the PDT 590 digital thermometer improves over reduced temperature ranges Note that linearity is as good as 0 05 between 0 and 50 bration the display count should increase as the sensor responds to the heat from your hand Label one probe Sensor and the other Sensor B and do not unplug or interchange them during cali bration point of water and 101 0 a
132. 8 250 270 290 25C 485 1 30 1 40 150 2SC 1116 340 355 3 90 2SC 2028 50 64 70 uPC 1008C 4 20 440 4 90 25 839T 130 1 45 1 60 25C 486 1 30 140 150 2SC 1124 80 90 1 00 25C 2029 150 180 2 00 uPC 1020H 1 90 210 240 2SA 908 860 880 9 80 25C 493 3 00 320 3 40 25 1127 80 90 1 00 25C 2074 80 90 1 00 uPC 1025 180 2 10 240 25 913 70 80 90 25C 495 45 55 60 2SC 1161 130 145 1 60 2SC 2076 50 64 70 uPC 1154 200 220 2 50 258 22 30 35 40 25C 496 45 55 60 2SC 1162 70 80 90 2SC 2091 90 110 1 20 uPC 1155 2 00 2 20 2 50 2SB 54 20 21 30 25 497 110 125 140 25C 1166 20 27 30 25C 2092 180 200 225 uPC 1156 1 90 2 10 2 40 2SB 55 40 53 59 2SC 509 35 40 45 2SC 1167 3 80 4 00 440 2SC 2098 3 20 3 40 3 70 uPD 861 8 00 840 950 258 75 35 40 45 25C 510 1 30 140 150 2SC 11708 3 80 400 440 25C 2166 1 0 1 60 1 80 uPD 857 8 00 840 9 50 258 77 35 40 45 25C 515A 80 90 1 00 250 1172B 320 360 395 250 72 50 64 70 uPD 858 6 00 630 7 00 2SB 173 30 35 40 2SC 517 250 2 70 3 00 2SC 1173 50 55 60 2SD 77 35 40 45 PLL OIA 300 420 4 60 258 175 20 27 30 2SC 535 30 8 5 40 2SC 1175 35 40 45 250 90 130 145 1 60 PLL 02 500 520 590 258 175 30 35 40 2SC 536 30 35 40 2SC 1177 11 00 1260 14 00 250 91 1 30 1 45 1 60 PLL 760 800 880 258 178 35 40 45 2SC 537 30 35 40 25 189 700 1 10 1 20 250 92 130 145 160 C 3001 130 145 1 60 258 186 20 27 30 2SC 627 130 145 1 60 2SC 1209 30 35 40 250 93 1 60 1 80 2 00 25C F8 2 20 270 2 90 2SB 187 20 27 30 25C 631 35 40 45 2SC 1211D 30 35 40 250 118 290 3 20 340
133. 828 Do 2 30 25 1445 250 1156W 160 1 80 2 00 254 666 35 40 45 2SB 541 320 340 3 70 25 829 20 27 30 2SC 1447 60 170 80 1306W 2 00 2 20 250 2SA 671 80 99 100 25 554 500 600 660 25C 830H 250 270 300 25 1448 70 566 90 HA 1339 250 2 70 3 00 2SA 672 30 35 40 2SB 556 3 20 340 3 70 2SC 838 35 40 45 2SC 1449 60 13394 250 270 3 00 25 673 35 40 45 258 557 210 250 2 80 2SC 839 30 35 40 2SC 1451 100 110 1 20 HA 1342A 2 50 2 70 3 00 2SA 678 35 40 45 258 5618 35 40 45 25C 853 70 80 90 25C 1454 3 20 3 40 3 70 1366W 2 50 2 70 3 00 2SA 679 420 4 40 490 2SB 564 40 53 59 2SC 867 320 340 3 70 2SC 1475 80 990 1 00 1366WR 250 2 70 3 00 2SA 680 4 20 440 490 258 595 110 1 40 1 50 2SC 867A 3 20 340 370 2SC 1478 EN 55 60 LA 4031P 1 80 2 00 2 25 2SA 682 80 90 1 00 258 596 110 140 1 50 2SC 870 35 40 45 25C 1509 50 55 60 LA 4032P 1 80 2 00 2 25 2SA 683 30 35 40 258 600 500 600 660 25C 871 35 40 45 2SC 1567 60 70 80 LA 4051P 1 80 2 00 2 25 254 684 35 40 45 250 183 40 53 59 2SC 895 420 440 4 90 2SC 1567A 60 70 80 LA 4400 190 2 10 2 40 25 695 40 53 59 2SC 184 40 53 59 2SC B97 200 2 20 2 50 25C 1584 6 00 6 30 7 00 LA 4400Y 200 220 2 50 254 697 40 53 59 2SC 281 30 35 40 2SC 898 2 50 2 70 3 00 2SC 1586 6 50 690 7 60 LA 4420 200 2 20 2 50 254 699A 50 64 70 2 283 40 53 59 25C 900 792 6 25C 1624 60 70 80 LD 3001 200 220 250 254 705 40 53 59 25C 284 80 90 1 00 25 923 EM 21 30 2SC 1626 60 70 80 5 1513L
134. 865 CA3140T 1 25 8887 CA3160T 1 25 DM8889 CA3401N 491 9374 7 seg CA3600N 3 50 pin LP E 14 pin LP 16 pin LP 18 pin LP 20 pin LP 14 pin ST 16 pin ST 18 pin ST 24 pln ST B pin SG 14 pin SG 16 SG 18 pin SG 8 WW 10 pin WW 14 pin WW 16 pin WW 18 pin WW ASST 1 ASST ASST 2 ASST 3 ASST 4 ASST 5 ASST 6 ASST 7 8R 25 49 16 45 19 18 21 20 28 27 32 30 25 M 27 25 3 30 45 42 27 24 32 29 E 32 47 43 41 37 3 37 10 OHM 5 62 27 OHM 68 OHM 5 ea 180 OHM 470 OHM 5 1 2K 3 3K 5 82k 22K 5 56K 150K 9 390K 1M 5 27M 50 100 LED driver green XC556C clear 4 1 XC209Y yellow 200 dia XC22R red 551 ted XC22G green 4 1 5266 green XC22Y 4 51 C526Y yeliow 170 dia XC526C clear MV1OB red 4 1 4 190 dla 085 dia XC111R red MV50 red 6 1 XC111G green INFRA RED LEO XC111Y yellow 1 4 x1 4 x1 16 flat XC111C clear PRICE 2 95 4 95 25 1 95 1 25 99 99 125 99 99 99 CALCULATOR CHIPS DRIVERS EXCITING NEW KITS gt nk Digital Thermometer Kit x gt sensors switching control for in door outdoor or dual BY ht display 40 F 199 F pros to 100 s Accuracy 1 nominal Set for Fahrenheit or Celslus reading
135. 9 95 DB25P 4 S 4 Ft 1 DP25P 1 25S 16 95 ea 8035 8 MPU wiclock 1 0 tines 19 95 gt 08255 45 2 DP25S 17 95 ea 2805 ll B S 9 0 Dip Jumpers TMS9900JL wihardware multiply ie TMS4045 102444 Stab 14 95 ir 49 95 2117 16 384X1 Dynamic 350ns 9 95 z 0214 1 1 ft 1 14 Pin 1 59 ea SHIFT REGISTERS house marked DJ16 1 1 ft 1 16 Pin 1 79 ea 500 Dual 25 Bit Dynamic 550 5262 2 1 Dynamic 4 1 00 V 024 1 1 ft 1 24 Pin 2 79 ea MM503H 50 Dynamic 50 MM504H Dual 16 Stat 50 PRO S DJ14 1 14 if 2 14 Pin 2 79 ea s a on Expand your 4K TRS 80 System to 16K DJ16 1 16 11 2 16 3 19 ea MM510H Dual 64 Bit Accumulator 50 S7IBINTEL 16K EPROM 5935 COMES complete with DJ24 1 24 1 tt 2 24 Pin 4 95 ea air ual a TMS2516 16k EPROM 435 s 8 each UPD416 1 16K Dynamic R 250NS For Custom Cables 4 Jumpers See JAMECO 1979 Calalog for Pricing 2518 Hex 32 Bit Static 4 95 o m po Power supply LJ D eac y mic Rams 2522 Bit Static 2 95 2708 M EPROM 10 95 ocumentation for conversion CONNECTORS V D Wen e oem 77 TRS 16K 75 00 E 2527 Dual 256 Static 29 zo dee osi s 25 Pin D Subminiature xd 92 520 2048 FAMOS 14 95 55 si i 9301 7611 1024 Tristate Bipolar 3 49 DB25P as pictured PLUG Meets RS232 2 95 2532 Q
136. 90 dB signal to noise ratio in mono or an 84 dB signal to noise ratio in stereo we will have to take Yamaha s word on those claims The S N readings we did obtain were superb and were no doubt limited by our equipment Figure 6 shows the FM stereo frequency response and separation shown in the lower trace The center trace shows what happens when the multiplex blend circuit is automati cally introduced because of low stereo signal strengths Under those circumstances separa tion across the entire frequency band decreases to not much more than 10 dB Such a low separation level still manages to offer some degree of stereo effect but the advantage is that noise is vastly reduced making it possible to listen to such signals in stereo without having to endure unbearable background noise levels In our listening tests we discovered that many of the stereo signals that would have had to be switched to the monophonic mode on sets not provided with the multiplex blend feature were quite listenable with this circuit operat ing The vertical scale in the scope photo of Fig 6 and in all other scope photos in this report is 10 dB per division Both mono and stereo FM distortion levels are so low that we wonder whether again our measurement capa bility was limited by the test equipment instead of the receiver itself For all we know the actual THD values for the Yamaha model CR 2040 may even be a bit better than those shown in Tabl
137. 914 22 pin edge connector with 156 spacing 740 15 7472 25 7435 4042 65 74C02 22 100 PHOTO TRANS 50 740 15 n Ms _ 4044 74CI0 27 RED YELLOW GREEN 7403 15 2416 LARGE LED s 2 6 1 00 489 85212 INTERFACE TIL 118 OPTO ISOLATOR 75 iu e 9 2509 TAI STATE STAT SR 6 ISOLATOR 80 7406 22 74164 85 74L509 251 CHAHAC GEN U P 7483 74165 741510 7518 6X 12 BIT SH 2522 STATIC Saf T AEG REGULATED POWER SUPPLIES POWER SYSTEMS 51111 115 230V 50 60 cy in 5v DC at 35A out 6 X 16X x 15 26 Ibs shipping weight S55 00 POWER SYSTEMS PS1106 115 230V 50 60 t2v DC at 1 out 5 x 16 5 19 Ibs shipping weight OV PROTECT OS DIODE CLAMPED 4019 37 4049 40 74671 65 4020 90 4050 40 74074 AS 4021 3051 1 00 74586 40 4022 4053 110 j4c94 75 4023 18 psa lt 746151 1 40 4024 75 74 160 1 05 4025 1g 4069 45 74 161 1 05 2N4908 PNP 5 2N5086 PNP S 92 2N3137 NPN Si RF 2N3919 NPN S TO 38 2N1420 NPN Si TO 5 2M3767 NPN S TO 66 2M2222 NPN TO 18 2N3055 NPN S TO 3 2N3904 NPN TO 9 2N3906 PNP 5 TO 92 2N5296 NPN 5 220 2N6109 PNP 5 220 2N3638 PNP 5 MPSA 13 NPN Si SANKEN AUDIO POWER AMPS S 1019 G10 WATTS 7 80 1 1020 G 20 WATTS 515 70 S 1050 G 50 WATTS 28 59 TANTULUM CAPACITORS 22UF 35V 5 1 00 6 8UF 35V 4 1 00 47UF 35V 5 1 00 TtOUF 10V 25 68UF 35V 5 1 00 22UF 25V 40 1
138. 94 GOD 91245 5I 8 0 58 epiuojj 190 0 JO OL 005 Seujunoo 5 pue Burddius 29 13040 98 0001 jO 0 S S N 518040 SWH31 89 M0V4239136180 Sy COOL X ui C 26455780 G6 91 FALCON wu Q s T A SA w s asodind 2 xz Z IH ZO L d3t S691 0007 XIII 1C JH SSeg 0 LOL d amp G6 lt PES a s 49 0 yang X1 uluo oS 001 i i 962 MEET ibi bd lr nn 9AOQV 10j OS L a eee s gs Pee ZHIN OtL yong euuejuv 9p L Qst _ vs 777 ZHW 09 M I dy Jeqqny 7 el 4104 IX WOOL L 9665 8 peiquiessy 5 4001 1 jou 1 4 8 AG OM e JAW HIA UUM 10 uognjoseH e I5 80 1 8 09 1 64 8I05 51IIM6 6 e 398 680 0 e C1I8 0 SN 104 194 7 7 v IX 29024 40001 d3t 96624 5 UOJ 000L WOf ee qojd 000L 5
139. C 1728 70 80 90 8105 190 210 240 2SA 750 35 40 45 25 383 35 40 45 2SC 1030 180 210 2 40 25C 1730 45 53 59 TC 5080P 5 00 5 20 5 80 25 755 80 90 1 00 25C 387A 35 40 45 25 1047 35 40 45 2SC 1756 50 55 60 TC 5081P 3 00 3 20 3 40 2SA 756 2 30 2 40 2 65 25C 388A 40 53 59 25 1051 3 40 3 55 390 2SC 1760 70 80 90 TC 5082P 3 40 355 3 90 2SA 758 340 355 3 90 25C 394 20 27 30 25C 1060 70 80 90 25C 1816 150 175 1 95 UHIC 001 420 4 40 4 90 2SA 764 380 400 4 40 25C 403 30 35 40 25C 1061 70 80 90 2SC 1856 45 53 59 UHIC 002 420 440 490 254 765 310 330 3 60 2SC 430 50 64 76 250 1076 30 00 35 00 39 00 25 1885 45 53 59 UHIC 003 4 20 4 40 4 90 2SA 774 40 45 50 2SC 454 30 35 40 2SC 1079 340 355 390 2SC 1908 30 35 40 UHIC 004 420 440 490 254 777 50 64 70 25 458 20 27 30 25C 1080 340 355 390 25C 1909 180 200 225 UHIC 005 4 20 4 40 490 2SA 794A 60 70 80 25 460 35 40 45 2SC 1096 45 55 60 2SC 1945 4 50 5 00 560 uPC 20C 210 2 50 2 80 2SA 798 50 55 60 2SC 461 35 40 45 25 1098 50 64 70 2SC 1957 50 70 80 uPC 563 190 210 2 40 25 814 70 80 90 2SC 478 60 70 80 25C 1111 210 250 280 25C 1969 360 4 00 4 40 575C2 1 30 145 1 60 2SA 815 60 70 80 25 481 130 1 40 1 50 25C 1114 4 20 440 490 25C 1973 70 80 90 uPC 576 1 90 2 19 2 40 2SA 816 50 64 70 25C 482 1 70 1 25 240 2SC 1115 250 270 3 00 2SC 1975 130 170 190 uPC 592H 70 80 90 25 818 70 80 90 25C 484 1 30 1 40 50 2SC 1116 320 340 370 25C 1978 540 600 660 uPC 10010 190 210 2 40 2SA 837
140. C s model JA S41 a capacitor re mains in the negative feedback loop of the preamplifier equalizer for shunting the DC feedback In Fig 4 e all stages DC designed in their feedback networks but coupling capacitors are still used in the tone control and power amplifier stages example of this design is Pioneer s model 006 Finally Fig 4 f shows design in which all the stages have eliminated capacitors in the feedback loops and all input capacitors to the various sections have also been eliminated According to JVC whose model JA S77 and model ROLL OFF NETWORK TURNOVER NETWORK TO THE TONE CONTROL AMP FIG 5 TWO STAGE EQUALIZER circuit is used by Onkyo in their model A 708 and A 705 DE g s pi T I alg jab ped Ru L DET T PEE np T s ie a XI x Lr Fi Pet os i r B5 y gt a u rl KU FS x d ed I b oe EPA I lt FIG 6 DC AMPLIFIER is evaluated using 400 Hz tone burst riding on a 20 Hz sinewave up per trace as the input signal Output from DC amplifier lower trace shows little phase shift P zs Ra iP a npa JA a LM Par Fd a Ze a Rma a i aa j war Fj i Fa E Fa F m N Ea P gk s i i
141. C4040P 6 951 sopcs 1 75 sopcs 1 75 sopcs 1 75 sopcs 1 75 sopcs 1 75 sopcs 1 75 sopcs 1 75 9 95 ea 1979 Catalog Avallable Send 417 stamp PHONE ORDERS WELCOME 415 592 8097 WORLDWIDE 1021 HOWARD AVENUE SAN CARLOS CA 94070 CIRCLE 7 ON FREE INFORMATION CARD 95 IV XR1489 1N4001 C360 C38M 2N2328 MDA 380 1 MDA 980 3 610681 MPSA05 MPSA06 1I597 TIS98 40409 40410 40673 2M918 2N2219A 2N2221A 2 2222 2N2369 2N2369A MPS2369 2N24B4 2N2906 2N2907 2N2925 MJE2955 2N3053 APA 10 p 22 pt 4 p 100 pt 220 pt 470 of 001m 0022 0047 01m 1 35V 15 35V 221354 33 35V 47 35V 68 35V 1 0 35V 47 50V 1 0 50 3 3 50v 4 7 25V 10 25V 10 50V 22 25V 22 50N 47 25V A7 50V 100 25v 100 50v 220 25V 220 50V 470 25V 1000 16V 2200 16V LITRONIX ISO LIT 1 Photo Transistor Oplo Isolator Same as MCT 2 or 4N25 2 997 AY 3 8500 includes score dispiay 6 games and select angles etc 50 PIV 1 AMP TELEPHONE KEYBOARD CHIPS CHIP AND CRYSTAL 1 and 2 01 MHZ Crystal Chip amp Crystal 1 39 DIODES
142. CLE 6 ON FREE INFORMATION CARD SN7400N SN7401N SN7402N SN7403N SN7404N SN7405N SN7406N SN7407N SN7408N SN7409N SN7410N SN 411N SN7412N SN7413N SN 414N SN7416N SN7417N SN7420N SN7421N SN7422N SN7429N SN7425N SN7426N SN7427N SN7429N SN7430N SN7432N SN7437N SN7438N SN7439N SN7440N SN7441N SN7442N SN7443N SN7444N SN7445N SN7446N SN7447N SN7448N SN7450N SN7451N SN7453N SN7454N SN7459A SN 7460N CD4000 CD4001 C04002 CD4006 604007 604009 604010 004011 C04012 604013 204014 604015 CD4016 CD4017 CD4018 CD4019 C04020 C04021 CD4022 CD4023 CD4024 CD4025 CD4026 CD4027 74C00 74002 74004 74008 74010 74014 74020 74030 74042 74048 74C73 4674 78MG LM106H LM300H LM301CN H LM302H LM304H LM305H LM307CN H LM308CN H LM309H LM309M LM310CM LM311N H LM312H LM317K LM318CN H LM319N LM320K 5 LM320M 5 2 LM320K 12 LM320K 15 LM320K 18 LM320K 24 LM320T 5 LM320T 5 2 LM320T 8 LM320T 12 LM320T 15 LM320T 18 LM320T 24 LM323M 5 LM324M LM339M LM340M 5 LM340K 6 LM340 8 LM340K 12 741500 74L501 74L502 74L503 74L504 74L505 74L508 74L509 74L510 74L511 74L513 74L514 74L515 74L520 74L521 74L522 741526 741527 741526 741530 74532 741537 741540 741 542 LM340K 15 gt LS hic 1 1 35 35 35 1 35 1 25 1 25 1 25 1 25 125
143. D state design useful for experimental or clinical monitoring of the human heart rate The term cardiotach is derived from the Greek word kardia meaning heart and the Greek word takhos mean ing speed Thus cardiotach literally means heart speed or heart rate Research has shown that the heart rate is generally proportional to the body s level of tension excitement or anxiety therefore a slower heart rate can be used as an indicator of the degree of relaxation For those practicing various methods of meditation or tension reducing relax ation the Cardiotach can be useful for displaying the relative degree of calm ness Experimenters and clinical technicians can use it as a response indicator of anxi ety states or relaxation responses to such external stimuli as words music odors visual displays etc The pulse rate in crease is usually quite rapid in response to anxiety producing stimuli and can be a more accurate indicator of the body s state than verbal responses This is one reason why a heart rate monitor usually forms part of a polygraph or detec tor Often during relaxation training ses sions an aural indicator can disturb the state of relaxation for the participants The Cardiotach has a front panel meter that provides a visual indication of the heart rate For those physical fitness enthusiasts who might want to monitor heart rate in relation to physical stress the Cardiotach could be useful t
144. DER CAT NO AND VALUE 1 12VDC SMIL REED RELAY spst N O 2200 ohms 7 8 x 5 16 x 5 16 5515 1 29 2for 1 30 25 2 1 OH 50 TEMP COEFFICIENT VOLTAGE REF DIODES ass volt 5054055647 1 29 100 for 1 30 208 ae Cee b 777 8 6 SKINNY TRIM POTS PRECISION 50 yield z3389 ess 129 12 for 1 30 250 25 32 Axa 33 m SU 60 pc PRECUT PRETINNED WIRE various lengths and colors 1971 8 ees 1 29 120 for 1 30 250 50 45 Axtal P 25 AMP BRIDGE 8 5 DUAL DIGIT READOUTS H P 5082 Type Bubble Magnifier 5748 1 29 10 for 1 30 300 15 31 Axis d 4 CALCULATOR KEYBOARDS 17 keys and up multl tunction 5777 1 29 B for 1 30 300 E 82 P RECTIFIERS 10 5 POTS audio taper plastic snap in mounting z5124 oes 1 29 20 for 1 30 500 2 lt 10 142 MEG DUAL POTS audio taper snap in mounting 5125 eo 1 20 20 for 1 30 20 85 ANE 2 50 1 AMP ZENERS wide asst of values 165IC 1964 2 1 29 100 for 1 30 2 2 ites 12 SCR S amp TRIACS 10 AMP 2551 salia E T 12 AB 130 8 3 QUADRACS 10 AMP 100 prime 50 100 TO or 1 D 200 165 z do MINI RECTIFIERS 15 AMPS 25V epoxy axial 285374 1 29 40 for 1 30 _____ by Cat No 92CV 5718 and Value O 400 3 50 3 51 10 2M3704 TRANSISTORS silic
145. DIGITSON A DIP LED red Diz33 1887 zoom remm 1 29 4 for 1 30 EPEa and 1 8 Textured Glass Surface for even heat dia 3 MM5262 2K DYNAMIC RAM specify 3459 1 29 for 1 30 name of the magaxina You are tribution Generates up to 150 120 watts Use for 10 2N711 HIGH SPEED SWITCHING TRANSISTORS TO18 npn 43374 1 29 20for 1 30 andthe manti photographic applications laboratory work aquarium 2 15W HI POWER TRANSISTORS 220V I 66 92797 mm sums 1 29 4 for 1 30 pete Sise 10 38 x m 1 HEAVY DUTY LINE 8 ft 2 cond 18 guage black 5803 1 29 2101 30 in No 92605723 m 1 MM5312 DIGITAL CLOCK CHIP 100 1525 1 29 2 1 30 ___ 8 2 MM5725 4 FUNCTION CALCULATOR CHIP 100 2036 ira 1 30 tor m 25 PLASTIC TRANSISTORS untested 92 5731 1 29 130 POLY P a 1 AMP 20 3 10 AMP 25V BRIDGE RECT comb IVIC gt 2447 ren 6 for 1 30 5 1 ALLEN BRADLEY POT 40K 2 14 watts IvDe l 2x a shafl 21748 00 0 vOLT 2 49 6 LINEAR SWITCHING TRANSISTORS 242905 pnp 05 73375 1 29 1210 1 30 942 R7 1000 50 2 AMP CYLINDRICAL RECT up to I
146. DITOR to deliver AC power to the load without applying DC voltage Such a DC voltage would of course damage speaker voice coils if appreciable direct current flowed At the very least the presence of a small amount of DC voltage would offset the position of the speaker cone and cause nonlinear operation Nowadays when audio manufacturers refer to DC amplifiers they mean a new type of amplifier capable of amplifying signals of extremely low frequency theoretically down to 0 hertz or DC II can be argued that since there is no musi cal content in any program source that goes to O hertz there is no point in designing an amplifier that actually can amplify DC signals After all even the lowest note on a giant pipe organ is a relatively high 16 Hz and attempts to capture the sound of that low note deliver it as more of a vibration that we feel rath er than hear Indeed some manufacturers define a DC amplifier not so much as one that can amplify down to 0 hertz but rather one that has no low frequency time constants in any of its negative feedback circuits Figure 2 a shows a conventional negative feedback loop while Fig 2 b shows how negative feedback is applied in so called DC amplifiers While the capacitor in the feedback network is eliminated there may still be coupling capacitors elsewhere in the signal path Generally an integrated amplifier consisting of a preamplifier equalizer INPUT OUTPUT OUTPUT
147. Digit DPM Logic Biock Special 3 95 LD110 111 3 Digit A D Converter Set 25 00 set XR205 8 40 XR2242CP 1 50 XR210 4 40 EX XR2264 XR215 4 40 XR2556 XR320 1 55 JE2206KA 14 95 XR2567 XR L555 1 50 JE2206KB 19 95 3403 X8555 39 XR1800 3 20 XR4136 XR556 99 XR2206 4 40 XR4151 XA567CP 99 2207 3 85 XR4194 XR567CT 1 25 XR2208 520 XR4202 XR1310P 1 30 XR2209 1 75 XR4212 XR1468CN 3 85 2211 5 25 XR4558 XR1488 1 39 XR2212 4 35 XR4739 1N4002 100 PIV 1 AMP TYPE VOLTS W PRICE 1144003 200 PIV t AMP 1N746 33 400m 444 00 1N4004 400 1 AMP 14751 51 400m 41 00 1N4005 600 1 1N752 56 400m 4 1 00 1N4006 800 PIV 1 AMP 1N753 6 2 400m 4 1 00 1N4007 1000 PIV 1 AMP 754 6 8 400m 4 1 00 1 3600 50 200 13757 9 0 400m 411 00 144148 75 16m 1N759 120 400m 4 1 00 1M4154 35 10m 1M959 82 400m 4 1 00 194305 75 25m 1N965 15 400m 4 1 00 1N4734 5 6 1 1N5232 56 500m 28 1N4735 6 2 lw 1N5234 6 2 500m 28 1N4736 68 lw 1N5235 68 500 28 1N4738 8 2 tw 1N5236 7 5 500m 28 1N4742 12 1w 1N5242 12 500m 28 1N4744 15 1w 1M5245 15 500m 28 1M1183 50 PIV 35 AMP 1N456 25 40m 6 1 00 tN11B4 100 35 AMP 1N458 150 7m 6 1 00 1N1185 150 35 1N4B5A 180 10m 5 1 00 IM118 200 35 s I TORS 2N3904 30 2 3055 2N3905 9 1 00 3055 4 2N3906 6 00 2N3382 5 1 00 24013 6 1 00 203398 5 1 00 2N4123 1 75 PN3567 3 100 249 175 PN3568 41 00 PN4250 1 75 pN3569 4 00 2N4400 4 1 00
148. Frequency Counter Kit Complete kit Jess case 47 75 NiCad Battery Fixer Charger Kit Opens shorted cells that won t hold a charge and then charges them up all in one w fuli parts and instructions 1 25 PROM Eraser will erase 25 PROMs in 15 minutes Ultraviolet assembled 34 50 Batt AC oper 0 1mv 1000v 5 ranges 0 5 accur Resistance 6 low power ranges 0 1 ohm 20M ohm DC curr 01 10 100 Hand held Y2 LCD displays auto zero polarity over range 74 95 S 100 Computer Boards Fully assem and test 249 00 Not a Cheap Clock Kit 14 95 Inciudes everything except case 2 PC boards 6 50 LED Displays 5314 clock chip trans former all components and full instructions Orange displays also avail Same w 80 Prescaler kit to 350 MHz 19 95 8K Static Kit Godbout 135 00 displays Red only 21 95 Case 11 75 Rockwell AIM 65 Computer 16K Static RAM Kit 265 00 6502 based single board with full keyboard 79 IC Update Master Manual 3500 24 static RAM Kit 423 00 60 Hz Crystal Time Base Kit 4 40 and 20 column thermal printer 20 char al Complete IC data selector 2500 pg master ref 32K Dynamic RAM Kit 310 00 Converts digital clocks from AC line frequency phanumeric display ROM monitor fully expand erence guide Over 50 000 cross references Free 64K Dynamic RAM Kit
149. G number is now part of the SK number SK 3444 a direct replacement for ECG 1234 is now listed as SK 3444 123A Thenew 1979 RCA SK Solid State Replacement Guide is the only guide you need You can buy and install RCA SK devices with confidence that the replacement is right and the quality is right too NPK 5 Tr osito AF Output 510995 Best of all RCA Top of theLinequality means fewer costly call backs and more profitable customerservicingforyou See your RCA SK distributor for all your solid state re placement needs and ask for your copy ofthenew authori tative RCA SK Replacement Guide SPG 202 or send your request with check or money order for 1 50 to RCA Distributor and Special Products P O Box 597 Wood bury N J 08096 PNP Ge R h 4 F Trans Broedcaai is a trademark of GTE Sylvania 626 M RADIO ELECTRONICS is also available It looks like an ordinary wall switch operates like one installs like one but can also be remotely controlled When we first looked at the unit we wondered what would happen if we had one an upstairs neighbor had one or the guy next door had one if his units would turn mine on and if my units would turn his on Obviously if our signal gets into his apartment it will But BSR is just one little step ahead of us There are 16 separate ranges that will automatically prevent overlap A simple dial selector on the unit codes the letters
150. HOTO FLASH ELECTRO CAP 600 360V 3897 1 29 2 for 1 30 MFD VOLTS TAE LE ps 63 driver adjust 8 4 MICRO SWITCH plunger style N O contacts SPDT solder tabs 5785 1 29 8 1 30 52 a5 EC Cat 250 tolerance 05 10 TRANSISTOR LED SOCKETS 1 4 high 3 pc leads plastic 23745 1 29 20for 1 30 4 E 92CU3866 Watt ratings cermet 8 5 SLIDF VOLUME CONTROLS asst of popular values for HIFI 2318 1 29 10for 1 30 50 15 mau d 10 IM ES PC leads 8 10 D33021 TRANSISTORS low power silicon hfe 60 92 5627 1 29 20for ME 50 25 do 35 20 2k 8 50 1 4 WATTERS asst value carbon resistors some 5 45797 Litas ia 1 29 100 for 1 30 50 100 21 Axial 22 50 2 5K 100K 2 FOR 1 29 8 60 CERAMIC CAPS incl NPO s neg coef N750 s assi values 590 1 29 1200 1 30 100 15 23 Axial 24 100 SK 200K 10 TV FM SPLICERS for 300 ohm shielded twin lead Bakelite 5547 1 29 20for 1 30 100 25 25 P C 26 LOK uM 30730 WIRE WRAP WIRE fits all tools and machines continuous length 3803 1 29 60 1 30 p MU X Nc tnmen 4 FOR 1 30 sg oG POWER TAB TRANSISTORS D40N1 N2 some NS 220 56291 1 29 20 for 1 30 no 2 A g 2 14 BLOCK TRIM POTS 200K 15 TURN PC 5 22535 1 29 4for1 30 Ho OU z OR
151. Hz systems 10 9 90 1791 MOS LSI dual density disc controlier from Western Digital 59 with pinout and data 1771 single density controller 22 50 All parts offered on a while they last basis H8 EXTENDER BOARD KIT Brand new from Mullen Computer Products This kit really takes the hassle out of troubleshooting or testing the popular Heath H8 computer Includes jumper links in supply lines for insertion of fuses Ammeters current limiters etc 39 TERMS Cal res add tax Allow 5 shipping excess refunded orders under 15 add 1 handling VISA Mastercharge call 24 hr order desk at 415 562 0636 Prices good through cover month of magazine COD OK with street address 02800 BILL GODBOUT ELECTRONICS BOX 2355 OAKLAND AIRPORT CA 94614 FREE FLYER Our new flyer is tilled with bargains for computer users electronic musicians experimenters and mad scientists Send us your name and address we ll take care of the rest For 1s class 24288808 save gas Enjoy the benefits of 20 better gas mileage quicker starting elimination of tune ups reduced pollution and 50 000 miles on plugs and points Update your car with a TIGER solid state electronic ignition system Easily installed in 30 minutes even on new cars Tiger 500 CD Assembled 49 95 Simplikit 29 95 Postpaid USA Master Charge amp Bank Americard accepted 36 30
152. II at 279 the least expensive The Superboard II and panion C1P deserve your serious consideration Creative Computing January 1979 The Superboard and its fully dressed companion the Challenger 1P series incorporate all the fundamental necessities of a personal computer at a very attractive price With the expansion capabilities provided this series becomes a very formidable competitor in the home computer area interface Age April 1979 The graphics available permit some really dramatic effects and are relatively simple to program The fact that the system can be easily expanded to include a floppy means that while you are starting out with a low cost minimal system you don t have to throw it away when you are ready to go on to more complex computer functions Everything is there that you need you simply build on to what you already have You don t have to worry about trading off existing equipment to get the system that will really do what you want it to do At 279 Superboard ll is a tough act to follow Radio Electronics June 1979 The Superboard II is an excellent choice for the personal computer enthusiast on a budget Byte May 1979 Oe SUPERB O ABDI Ww 00 ghe v The world s first complete computer system a board including full keyboard video display audio cassette interface 8K BASIC in ROM and 4K RAM Expandable Requires 5V at 3 amp power supply C1P 3
153. IPs and ICs The point is where theres solder there s Ungar Tools and accessories that let you handle every job Drop us a line and we ll send you our new catalog It s free And it includes everything you need for successful soldering Except the solder For our com plete catalog write to Ungar Division of Eldon Industries Inc Box 6005 Compton CA 90220 213 774 5950 La niii RADIO ELECTRONICS PTS the NEW vou need to know for semiconductors Transistors SCRs Sas ICs diodes rectifiers zeners the same components we use for our module and tuner rebuilding A high quality line of profit builders for the servicing technician dealer Ask for a complete price list at any PTS tuner module servicenter CIRCLE 46 ON FREE INFORMATION CARD 2 Catch PanaVise It tilts turns and rotates your work exactly where you want Add our new Tray It catches small parts you drop separates tools and keeps parts sorted The Tray s wide 874 diameter of cast metal gives no tip stability has 6 slip resistant neoprene feet Catch all the PanaVise combinations at your distributors now Write for FREE brochure and distributor list VISE 2850 29th St Long Beach 90806 CIRCLE 65 ON FREE INFORMATION CARD PTS ELECTRONICS INC i The Only Name
154. ISENGAGE SWITCH SPEED SENSOR AIRLINE PILOTS COMPARE COMPUCRUISEr TO SOPHISTICATED AVIONICS EQUIPMENT Similar to types of computers used on modern airliners the CompuCruise slim panel mounted control module contains a digital readout and back lighted control buttons both readily visible in the dark By quickly learned systems of in quiry the driver can elicit virtually any informa Hooma Hoone 7 2 C 415 838 8060 tion relating to time distance fuel and perfor mance of his vehicle There are a number of digital type instruments on the market which can be purchased for your car purporting to provide functional data on per formance but all are basically calculators operating on fixed information provided by the driver CompucCruise is a true computer operating from automatic data sensors which constantly react to changing conditions automatically recomputing vital data every second Each func tion operates independently with data dis played and updated constantly until you change your request of the computer Fuel management takes on new Significance because CompuCruise tells you the most effec tive driving speeds the type and brand of gasoline most suitable for your vehicle will tell you the effects of different types of tires and different tire pressures road conditions and engine tune up condition You can get instan taneous computations on current gas mileage fu
155. ITCH I 80X I 703787 TE c2 1 ANTENNA RF La D I 0M IV I 1 I I J FIG 9 ANTENNA SWITCH BOX connects videodisc player to TV antenna The ideal scope for most industrial laboratory educa terminals it acts automatically and prevents videodisc signals from tional and servicing applications Frequency response See DC to 15MHz Rise time 23 nsec Sensitivity 10mV cm is now coupled through both baluns to the set Ultrastable trig action with simplified level adjustment tion a minimum of 60 dB The player will operate properly on supplied channel 3 or 4 even if a medium strength signal is already present at the external VHF antenna those channels See your local VIZ distributor or write VIZ VII Test Instruments Group 335 E Price 51 Philadelphia PA 19144 The VoltOhmyst company 6261 market center CLASSIFIED COMMERCIAL RATE for firms or individuals offering commercia products or services 1 50 per word no charge for zip code minimum 15 words NONCOMMERCIAL RATE for individuals who want to buy or seil personal items 856 per word no minimum ONLY FIRST WORD AND NAME set in bold caps Additional bold face not available as all caps at 10 per word Payment must accompany all ads except those placed by accredited advertising agencies 5 discount for 6 issues 10 for 12 issues
156. J3 HP5082 7656 mum 60 Hz rejection is achieved by hav ing the integration period be an integral multiple of the line frequency Three conversions per second are performed with the 48 kHz clock frequency Accuracy with the dual slope A D converter is achieved without using preci sion resistors or capacitors Integration capacitor C14 autozero capacitor CIS and reference capacitor 12 must have low leakage characteristics as well as low dielectric adsorption Polypropylene film Mylar and polycarbonate capacitors are recommended for their excellent dielec tric properties R25 4702 054 IC4 ICL 7107 CPL REF IM IM C V HIGH V LOW HIGH REF generates a pulse train that is voltage doubled and rectified for the negative supply REF TPUT K INPUT FIG 4 THE DIGITAL THERMOMETER is designed around a 3 digit A D converter The 555 timer IC Although the A D converter has an on chip voltage reference the LM329DZ reference voltage is more stable because it Is not subject to internal heating caused by the LED segment drivers The 1 volt reference is externally supplied from a resistive divider across the LM329DZ precision Zener The circuit requires a 5 6 as well as a 5 volt power supply The 9 to 14 volts AC or DC input supply is rectified and filtered by DI D4 and The 7805 volt age regulator supplies the 5 volts The 555 timer IC2 operates the astable mode and ge
157. K u test z4006 00 129 100 for 1 30 50 LYNNFIELD gCTIFIERS 1 HEAVY DUTY LINE CORD 2 cond 6 ft 18 guage white 25804 1 29 3 bad a Terms Add Posta 40 f MINI R 40 m 10 2N2222 or equiv TO 18 metal 71992 10 Tr m 1529 0 Pirani 617 2 Rated Net 30 epuxy rec 10 ENTRY SWITCHES SPST 1 amp norm open 125V 25321 200 1 Retail 45 3828 Famous for 8 TRANSISTOR RADIO EARPHONES 8 ohms imped 2946 e st 29 T for1 30 il 16 18 Del Carmine St lt tfrers E eae axial lends 2 50 15 FLUORESCENT OVERFLOW READOUT TUBES I63 3288 1 29 30for 1 30 MINIMUM ORDER 8 Wakefi ld 8 M use 8 2 ALUMINUM HEAT SINKS for T0 220 553381 2 1 29 4 for 1 30 ee eld MA ENS 3 1 2N5001 80V TRANSISTORS 57100 2800 1 29 2 for 1 30 Cat 92CU2385 _ LEUR n ANY P 5 gt CIRCLE 18 FREE INFORMATION 111 E E PADIO ELECTRONICS CARBON FILM 14W 5 CMOS BOARD 52 95 CONTAINS 4553 3 digit decade counter 4511 4bit latch 7 seg decoder driver for LED display 4060 oscillator 14 stage binary counter 4011 CMOS gate 2 switches resistors capacitors HP 2 digit LED display RCA 10220 8M 600V TRIAC ea 99 ten 9 50 89 c BISTABLE RELA ISOLATOR
158. K dynamic RAM Also available are optional on board 1 0 interfaces for serial and parallel 1 0 serial interface provides RS232 20 mA current loop with software programmable baud rate model control lines word length stop bits etc to on board D8 25 connector Jumpers can be used to drive printers or to interface to larger computers or modems The board contains 2 CIRCLE 122 ON FREE INFORMATION CARD latched 8 bit parallel input and output ports with standard 22 44 pin edge connector Prices basic unit including S 100 bus interface and edge connector card guide manual cable 185 kit 245 assembled other connectors and card guides 45 kit 75 assembled RAM support option 45 kit 75 assembled I O option 85 kit 115 assembled HUH Electronics 1429 Maple St San Mateo CA 94402 R E RADIO ELECTRONICS j Kleps 40 Kleps 30 Kleps 1 Kieps 10 Kleps 30 E Kieps 20 Clever Kleps Test probes designed by your needs Push to seize push to release all Kieps spring loaded Kieps 10 Boathook clamp grips wires lugs terminals Accepts banana plug or bare wire tead 434 long 1 59 Kleps 20 Same but 7 long 1 69 Kleps 30 Completely flexible Forked tongue gripper Ac cepts banana plug or bare lead 6 long 1 99 _ Kleps 40 Completely flexible 3 segment automatic collet firmly grips wire ends PC board terminals connector pins Accepts banana
159. LITY Measurement Evaluation RMS power channel 8 ohms 1 kHz watts 145 3 Excellent RMS 8 ohms 20 Hz watts 140 0 Superb RMS power channel 8 ohms 20 kHz watts 148 7 Excellent RMS power channel 4 ohms 1 kHz watts 205 0 Excellent RMS power channel 4 ohms 20 Hz watts N A N A RMS power channel 4 ohms 20 kHz watts N A N A Frequency limits for rated output Hz kHz 10 40 Excellent Dynamic headroom dB 1 2 Nonrated DISTORTION MEASUREMENTS Harmonic distortion at rated output 1 kHz 0 0029 Superb Intermodulation distortion rated output 0 0025 Superb Harmonic distortion at 1 watt output 1 kHz 0 008 Excellent Intermodulation distortion at 1 watt output 0 01 Excellent DAMPING FACTOR AT 8 OHMS 50 Hz 50 Very good PHONO PREANPLIFIER MEASUREMENTS Frequency response RIAA dB 0 0 2 Excellent Maximum input before overload mV 275 33 for MC Superb Hum noise A weighted referenced to 1 watt or 0 5 volt output for 5 mV input dB 81 5 73 for MC Excellent HIGH LEVEL INPUT MEASUREMENTS Frequency response Hz kHz dB 3 5 80 3 Excellent Hum noise A weighted referenced to 0 5 volt or 1 watt output 0 5 volt input dB 83 Excellent Residual noise A weighted minimum volume referenced to 1 watt output 84 Very good TONAL COMPENSATION MEASUREMENTS Action of bass and treble controls See Fig 8 Superb Action of secondary tone controls See Fig 9 Superb Action of high and low c
160. Letters from A through F are used to represent 10 through 15 with a single symbol When Quality Counts Spaces can be imbedded between words if 151 Dupont Street Plainview N Y 11803 M ADER desired At the end of the line you have a i Regional Offices Chicago amp Los Angeles number of choices In Fig the first line 15 _ _ Instruments Corp terminated by a semicolon This told the at aa machine wasn t finished yet and that I will Call Toll Free 800 645 7120 For the Name of Your Nearest Distributor give a new address and more input Everything else was ignored until the next hexadecimal CIRCLE 52 ON FREE INFORMATION CARD 6261 N RADIO ELECTRONICS Train with NTS for the MicroComputers digital The world of electronics is daily becoming more challenging Technology is growing more specialized and the importance of digital systems increases every day Test instruments home entertainment units and industrial control systems are all going digital And now NTS training programs include a wider choice of solid state and digital equipment than ever before offered in any home study course Advanced NTS Heath digital color TV 25 diagonal with optional programming capability NTS Heath microcomputer digital test equipment digital stereo receiver 70 watts per channel NTS compu trainer plus much more state of the art equipment to make your training exc
161. N ELF BUG MONITOR COLOR GRAPHICS 8 MUSIC SYSTEM TEXT EDITOR ASSEMBLER DISASSEMBLER VIDED DISPLAY 80480 and More Breakthroughs Coming Soon Soon to be introduced ELF II special application kits that give you the hard ware and software you need 0 use ELF II tor specialized purposes such as a telephone diater industrial controlter home photography secursly sys tem police alert motor controller _ station output monitor on a conveyor heli assembly line and some new super tantastic games Also coming soon PROM Programmer A 0 OA Converter Controller Board and more Unlike some heavily advertised hobby computers ELF II doesn limit you to pre recorded programs With ELF II you learn computing from the ground up tram machine language to assembly language to BASIC in quick clear and easy steps ELF II is a powerful computing tool but one that you can master with the same ease you once mastered a slide tule or pocket calculator Master This Computer In Flash Regardless of how minimal your computer background iS you can learn to program an ELF II in almost no time at ail Dur Short Course On Micropro cessor amp Computer Programming written in non technical language guides you through each of the COSMAC 18025 capabilities so you ll understand everything ELF II can do and how to get ELF if to do it worry if you ve been stumped hy computer books before The Short Course represents a major
162. ONICS High accuracy dependability five function modes 37 and 8 45 digit displays auto rang ing automatic zero adjustment automatic polarity indication battery operation or optional AC to DC adapters these are just some of the features that make SOAR s bench type DMM S different and better Take our MC 545 It s priced below 290 and it measures DC voltages to 1000 V AC voltages to 750 V DC and AC current to 1000 mA and resistance to 20 meg Maximum indication is 19999 or 19999 It also comes with an optional BCD output 8 4 2 1 for connecting the multimeter between a CPU and a digital recorder And then we have the top of the line the MC 546 It has most of the features of the 545 plus auto ranging 4 546 If a 3 digit display satisfies your requirements consider the MC 535 or MC 536 They have HI LO Ohm switches for all ranges and prices start at 199 95 536 To get the full story call or write for a free catalog on SOAR s entire line of dependable and economical test instruments SOAR ELECTRONICS U S A CORP OA 4 200 1 STH AVENUE ation RONKONKOMA NEW YORK 11779 cor poration TEL 516 981 6444 TELEX 144638 CIRCLE 49 ON FREE INFORMATION CARD Some of the newest stereo decoder IC s using the PLL Phase Locked Loop tech nique are capable of maintaining a separa tion of around 60 dB throughout the audio frequency band so it can be expected
163. OR Ses m TRUE _ RADIAL ERROR RADIAL ERROR 705980 FIG 1 PHOTODIODES AND PREAMP MODULE are located on the slide assembly The preamp provides reverse bias to ail diodes 0 DYA ideodisc 1 Look at the circuitry Part 2 in depth look at the signal processing circuitry in Magnavox s new videodisc player It even includes a circuit that automatically compensates for dropouts LARRY STECKER EDITOR the total FM signal from the photodiodes This signal is passed on to the signal processing circuits on the video servo panel A block diagram of this circuit is shown in Fig 2 A high frequency amplifier splitter separates the sound FM from the video FM The sound FM is fed to two frequency sensitive stages the 2 8 MHz sound II demodulator and the 2 3 MHz sound 1 demodulator These stages serve as FM detec tors and retrieve the audio signals from their respective carriers The two resulting audio signals are applied to an elec ronic switch network that applies either one or both of the signals to the VHF modulator The sound button on the front panel of the player determines which audio signals are used The video FM an 8 MHz signal is applied to video demodu lator I The demodulator extracts the composite video signal from the carrier This signal is then amplified by the video amplifier and applied to the modulator The digita
164. ORMATION CARD mounted on a 24 X 28 inch panel Display contains 5 packs each of 4 nylon tie sizes reus able ties two assortment packs and 5 each of 3 sizes of wire connectors color coded for size Stock numbers are listed on the back of each pack Vaco Products Co 1510 Skokie Blvd Northbrook IL 60062 R E Surprised Dont Because today Ungar has one of the broad est most complete lines of sol dering and desoldering equipment and accessories in the business Product by product you ll find application oriented designs that let vou neatly handle any job that may come along Take for example the Ungar soldering irons Modularly designed to give you a complete choice of handles heaters and tips You get the versatility you need And fast easy economical on line replacements Plus the The Onl We Don t Make The Solder hi ing right tool for every job micro electronics bench or field service repairs of energized circuits compatibility with sensitive components Or consider Hot Vac 2000 A revolutionary new design in desoldering tools Lightweight Pistol grip Easy to clean Extra long life tips And try our versatile lightweight Heat Gun on your assemblies and repairs There s an Ungar tool for CIRCLE 31 ON FREE INFORMATION CARD mii i annt MI 1 dt special jobs too Like our highly sophisticated Ungarmatic Soldering Station And special kits for desoldering D
165. Plastic Case Mfg by Teledyne 6 FOR 1 15 AMP SPECIAL Units are brand new non submersible NATIONAL SEMICONDUCTOR UMBO CLOCK MODULE 495 795 59 95 ZULU 50 OFF SALE MOTOROLA POWER TRIAC TO 220 CASE 89 each 5 FOR 3 95 Large Manufacturers Surplus 5 Ax10 In Made of 3 8 in tempered glass with heating element laminated on back Works off 120 VAC Protected by thermostat and two thermal fuses Rated 120 Watts Use for any heating applications Perfect for heating ferric chloride to increase PC board etching efficiency ADD 1 95 FOR AC XFMR PERFECT FOR USE WITH A TIMEBASE EXPERIMENTER S CRYSTAL 262 144KHZ This frequency is 2 to the 18th power Easity divided down to any power of 2 and even to 1HZ New by CTS Knight A 5 ica 1 25 each 4 00 MHZ 1 75 400 PRV TIP29 NPN TIP30 PNP MILITARY TIME FORMAT VACO wiring amp crimping tool does it all e Strips wire Crimps all terminals Cuts wire Cuts bolts 5 49 1963 REGULAR 11 22 This is the Wiring and Crimping Tool that does it all It slices 6 sizes of bolts 4 40 5 40 6 32 8 32 10 32 and 10 24 It strips wire 22 10 guage It crimps atl ter minais bolh insulated and non insulated Conveniently located wire cutter at tip of jaws cuts wire percisely easily ITC ELECTRONIC SUPERMARKET 2772 W Olympic Blvd Los Angeles CA 90006 213 388 0621 Minimum Order 5 00 Please add
166. QUID LEVEL DETECTOR CHIP R 484A TC i 7427 18 7482 50 Contains an on board osciltator amplifier amp power POWER SUPPLY KITS Unless you re a do ith d 7429 29 7492 35 driver Can drive siren or alarm directly Can monitor We supply ail electrical and electronic ears you won t h g with very goo 7432 20 74145 40 basement moisture etc A myriad of applications parts you supply labor and mechanical th 2 ear a thing from 747 20 74151 50 Specs amp application notes included 7 50 2 12 00 parts tools and case an alin wien te ak ae E 2 Complete Kit additional parts amp case 15 00 Battery Charger 12VOC 20 20 Ibs wave Motnteron 7439 25 8235 50 RADIATION DETECTOR not kit Grd 19 50 etc Optional delay mode auto reset 7442 30 8266 20 lst time offered safeguard your home Battery Charger 12VDC 15A 15 I Also has connections for fire detection 7445 50 8563 50 This device moniters microwave ovens amp color TV s Ord no 9C0089 14 50 Operates 12 5V0C Originally sold 7447 35 8815 25 Accurately calibrated to meet strict government radia Ni Cad Battery Charger Up to 35VOC tor 179 Only weighs 3 Ibs 7451 16 75324 75 tion exposure standards 535 00 m ma IS Ibs Order no 8030336 daca ae LINEAR MOTION DETECTORS Logic PS Kit 5V 1A
167. R MIKE 1 50 Brand Name Speaker Kits 37 20 6 60 10 5 Case TRANSISTOR SOCKETS 5 9100 Aie MM d IT os gt i pO LM 381 1 25 LM 3064 2 00 3V 1 2 Amp Transformer 1 25 sound repro 3 way 138 88 chip ME8900 2 tow 8 legs ea 10 250 Self Adhesive Rubber Bumpers 25 for 1 00 ans 0 mare dita rear firing passive rad LM 389 120 LM 3070 2 50 AUDIO CABLE 24 2 conductor 1 00 100 ft MR W 34 superhorn 320 is iB 2 100 HARDWARE piezoT Freq resp 30 Hz 7 170160 6 95ea 60 00 10 LM 748CN 30 LM 3089 125 4 40x 4 3 screws 1 000 pcs ass t 3 50 to 25 KHz power 10 80 0 t RMS watts Size 19 H ESI Box 619 Dept R7 6 32 4 3 screws 1 000 pcs ass t 4 00 ELECTROLYTICS 100 uf 10V 25 470 uf 10V 25 3200 uf 25V 50 x 11 m x 74 D List price over 500 pair Our price is 138 88 pair 9130224 96lbs pr i Lynnfield Mass 01940 SEND FOR OUR FREE CATALOG Use Major Credit Cards by Phone 617 532 2323 7 5 Mon Fri 9 3 Sat 510 min on charge orders No C O D s Please edd postage in Manchester NH visit our store The Towne Dumpe CIRCLE 36 ON FREE INFORMATION CARD Voltage Regulators 7805 78051 7812T 7905T 79121 1 25 each Terms MICRO MART accepts Visa MC and telephone COD S Foreign orders 50 00 minimum plus shipping US funds
168. SELECTOR switches enable you to feed any program source to the tape output Jacks while the INPUT SELECTOR switch chooses the program source that will be con nected to the speakers The PHONO SELECTOR switch chooses any of four load resistance values for the cartridge and in addition selects moving coil MC preamplifier cir cuit that lets you use low output cartridges without having to add a matching transformer or pre preamplifier head amp RADIO ELECTRONICS go e MANUFACTURER S PUBLISHED SPECIFICATIONS FM TUNER Usable Sensitivity mono 1 6 uV 9 8 dBf 50 dB Quieting mono 3 2 uV 15 3 dBf stereo 35 uV 36 1 dBf S N Ratio mono 90 dB stereo 84 dB Capture Ratio 1 5 dB Selectivity DX local 82 48 dB IF and Spurious Rejection 100 dB Image Rejection 80 dB AM Rejection 60 dB Frequency Response 30 Hz to 15 kHz 0 4 1 0 dB THD mono 0 07 at 100 Hz amp 1 kHz 0 1 at 6 kHz THD stereo 0 09 at 100 Hz amp 1 kHz 0 15 at 6 kHz Stereo Separation 50 dB at 1 kHz and 100 Hz 45 dB at 10 kHz Subcarrier Rejection 70 dB Sensitivity 5 uV 19 2 dBf Auto DX Switching Sensitivity 35 zV 39 2 dBf AM TUNER Usable Sensitivity 15 Selectivity 30 dB S N Ratio 50 dB THD 0 4 Image Rejection 40 dB IF Rejection 35 dB Spurious Rejection 60 dB AMPLIFIER Power Output 120 watts per channel 8 ohms 140 watts per channel 4 ohms 20 Hz to 20 kHz Rated THD 0 0
169. SISTOR EQUAL npn switching 8 for 1 00 2N3906 TRANSISTOR EQUAL pnp switching 8 for 1 00 18MHz CRYSTAL 002 tol 3 00 24MHz CRYSTAL 002 tol sss 3 60 36MHz CRYSTAL 002 tol 3 00 LM340T 5 5V VOLTAGE REGULATORS 2 for 1 50 Noltage Regulators Type Equal to Vollge Case Price 7805K LM340K 5 5 10 3 1 40 7812K LM340K 12 12 TO 3 1 40 7815K LM 340 15 15 TO 3 1 40 78051 LM 340T 5 5 10 22 95 7812 LM340T 12 12 TO 220 95 7815 1 43407 15 10 220 95 7818 I MI I8 L IO 220 95 78241 1AA140T1 24 10 22 95 2 for 1 00 CIRCLE 25 ON FREE INFORMATION CARD 74123 60 FREE CATALOG Featuring The best selection of computer accessories add ons factory fresh IC s led s semi s soft ware PC aids prototyping aids books test equipment and more Always updated Dozens of new products every issue 19355 BUSINESS CTR DR 6R7 NORTHRIDGE CA 91324 CIRCLE 53 ON FREE INFORMATION CARD HOUSE MARKED SPECIAL CE DARLINGTON a gt POWER TRANSISTOR 16 Amps 60 Volts 150 Wans Similar to MJ4030 PNP 1 50 each Specily NPN or ND TUN M J4033 NPN 12 VOLT RELAY Clear Plastic Enclosed 3 PDT 12 Amp Contacts 3 00 eoch 3 AMP DIODES MERCURY SWITCH 100 PIV Axial Leads 1 00 Package of 8 60 each ALCO MINIATURE SWITCH MAGNETICALLY ACTVATED SWITCH NO W Magnet Engaged inSialis in Magnet Inclu
170. Simply plug the Command into your wall outlet in any desired location in your home Plug each lamp or appliance into the appropriate module and then plug that module into any wall outlet Any number of command consoles may be used in a single system TOTAL CONVENIENCE With System X 10 at your side you can almost every light and electrical appliance in your home without leaving the comfort of your easy chair Imagine turning on a TV setor stereo even dimming alight in the next room without moving from your chair It may sound like one of trose electronic devices found in a spy thriller but you can have one today And how many times have you left a light or ar electrical appliance on overnight simply because you were too tired or too lazy to turn it off Think of the money you can save on electric bills with System X 10 Turn off heaters or APPLIANCE MODULE Each module receives signals the Command Console to turn appliances on and off such as TV stereo fan etc Maximum appliance ratings Resistive load 15 amps Motor load 1 3 H gt Incandescent Lamp 500 wats UL listed WALL SWITCH MODULE NOW AVAILABL Receives signals from the Sommand Console to control incandescent lamps normal y operated a wall switch up to 500 watts Installs just like amy norrral wall Switch Functions include on remote local control and brighten and dim by emots control UL listed
171. Synthesizer IC Full Spec Devices o Direct from Motorola and National Semiconductor Cat No _ ONLY 7400 276 1801 35 7402 276 1811 39 7404 276 1802 356 15 Mercury Tilt Switch Trimmers Hermetically Sealed Perfect for Alarm Circuits 89 299 Featured in Oct Popular Electronics Actual Size un 2161651 Creates almost any type of sound Subminiature position detecting Assorted low loss RF trimmer 7413 276 1815 79 music to gunshots Built in audio amp Switch for uSe in projects or special capacitors May include both com 7420 276 1809 39 Includes 2 VCO s LF osc noise gen applications Switch is normally closed pression and piston types rated up to 7427 276 1823 asc filter 2 mixers envelope modulator logic when upright opens when tilted more 500VDC with maximum capacity values bye ME circuit 28 pin DIP With data appli than 45 Rated 100mA at 24VDC of 3 to 100 pF 7447 276 1805 aoe cations circuits 276 1765 2 99 275025 nl os Ot 272 805 Pkg of 15 1 98 7491 5761829 3 7473 2764803 49 Top Quality IC and PCB Accessories 7474 276 1818 49 V T
172. T Parts Program You get four free information packages every year RCA s QT 150 Parts Program is better than ever Registered dealers receive four free information mailings per year through RCA s Direct Information Service program Quarterly mailings include Complete Dealer Price Book RCA Consumer Parts Latest Price Supplement RCA Drawing Number to Stock Number Cross Reference Color TV Module Cross Reference 9 B amp W TV Module Cross Reference Dealer QT Inventory Control Form and many other useful publications To join contact your RCA Distributor and register as a QT Dealer You will receive your package of 150 of the most needed fastest moving parts to repair older TV sets You will also receive your first quarterly information package Every information mailing will include the latest price publication plus additional infor mation about RCA Parts required in your servicing business Don t forget your QT Parts inventory program has automated annual drop ship updating for your convenience special QT Parts Rack is also available to save time and space Call your RCA Distributor or write to RCA Distributor and Special Products Division Deptford N J 08096 J RGA QT Parts AMERICA S ONIY LAND SEA AND Only incredible new no crystal Bearcat 220 Scanner tunes in all the real excitementof the entire AM aircraft band plus every FM public service frequency w
173. TERN for the components side of the PC board Approximately half size nylon machine screw The three 7805 leads must be bent straight down about inch away from the regulator body and soldered and clipped before the 7905 leads are soldered Clip the excess 7805 leads close to the PC board so that they do not touch the 7905 leads The LED digits are soldered to the display board as shown in Fig 10 After completing the PC boards place inch piece of excess resistor lead in main PC board locations b and e and solder them in place so that one half the lead length extends from each side of the board Bend these wires forward and insert the ends of wire b into locations a and c and insert wire e into locations d and f on the display board Solder the wires after carefully aligning the two PC boards so that they are at right angles with all foil fingers exactly matching There are two sets of foil semicircles that can be used as indica tors to check the alignment After re checking alignment solder the 26 mating foil fingers together Secure the three slide switches to the cabinet top with small flat head screws Put the main PC board on the switch lugs FIG 6 PATTERN for side 2 of the board Only a few parts are mounted on this side and check the positioning with the rear panel front panel and cabinet top in place Solder the 18 slide switch lugs to the main PC board Power input jack J3 is mounted on the rear
174. TOR PROCESSOR 703985 gt Bos i A At T i 4 n E CLAMPGATE LY LS VID PULSE PIX BACKGROUND sor NO BLANKING B m ro aei MEL VIDEO s IREFERENCE CM e TIE ICONTROL E f VIDEO 117 1 st I 1703992 21 MOU Bs FIG 7 COMPOSITE VIDEO SIGNAL PROCESSING CIRCUIT is made up The 15MHz scope with accuracy convenience vers of a video processor mode control and reference control modules atility and a broader voltage capability DC thru 600V I2V than several others costing more money View channels L _ CHANNEL A B A and B A B or with calibrated X Y SELECTOR capability through 15MHz Built in delay line allows for T viewing the full input waveform so information such as LM E m undershoot and overshoot can be seen and analyzed VHF Unique simplified trig hold and adjustment control with LED indicators show trig polarity at a glance Two RF TO y g AUDIO I MODULATORI _ gt ANTENNA direct X10 LoCap probes are supplied j 702780 The Everything Scope X pol s y 0 VI Single Trace WO 527A 525 FIG 8 RF SIGNAL MODULATOR takes the signal from the player modu lates a channel 3 or 4 RF signal and feeds that signal to the TV set s antenna terminals through an antenna switch box EXTERNAL ts 1 300 n 1 SW
175. TORS 2 51 51060 n p 1 29 200 for 1 30 12 TRANSISTOR SOCKETS asst npn and pnp 1 651 1 29 24 for 1 30 49 50 3 AMP SILICON RECTIFIERS axial asst V 865 1 29 100 for 1 30 50 POLYST YRENE CAPS plastic coated 1052 viene 1229 100 for 1 30 ILadies 30 4 CABLE TIES non slip a TES e Cat 2 tor Men s B 30 pc HEAT SHRINK asst sizes 50 5 95248 Ed 2 ES 3 ELEMENT 2 514 5 10W STUD ZENER DO 4 5287 1 29 4 X 1 30 iil 1 50 BE es 10 RCA PHONO JACKS chasis mount leflon 55119 1 29 20for 1 30 E 120 15 THERMISTORS asst lypes styles amp 2048 1 03 30 for 1 30 B 4 5 DIGIT 7 SEGMENT READOUTS in Hn quce Y 2 j k a L ee BF B 25 CAN TRANS asst prime hobby TO 1 TO 5 TO 18 2603A 6 88 2 for 6 89 m 1 FOTO FET N CHANNEL Effect HET 20 ets HOW TO ORDER ity 1 VOLTAGE REGULATOR 10202 case 12V 600 1900 i or 1 When ordering shways 5 Laat 2 a1
176. UF 35V 5 1 00 15UF 35V 3 51 00 2 2UF 20V 5 1 00 3OUF 6V 5 1 00 3 3UF 20V 4 1 00 33UF 20V 40 4 7UF 15V 5 1 00 47UF 20V 35 68UF 15V LINEAR CIRCUITS LM 201 75 LM 30 748 LM30 LM 308 LM 311 LM 318 LM 324 LM 339 LM 358 LM 370 49 00 dpi Co CO fun 74L5138 7445139 74L515 7405553 74L5155 74L5 56 7415157 L DYN _ 5 420410 tan STAT 5 41162 5280 2107B UYN TMS 4050L 7445160 1445161 7415162 74 5163 1 WATT ZENERS 3 3 4 7 5 1 56 9 1 24173 10 12 15 18 22V 6 1 00 7410 15 7486 74174 511 748311 204 4K 74L514 2 gt 2708 Bk EPROM 450 m1 e 6571A 7 x 9 character gen 10 75 7411 18 1 2 74175 NE 2 rel LM 377 TMS 4050NL 2 2 91 74176 TMS 3409 NC BITS DYN S R 825129 UNIVERSAL 4Kx8 MEMORY BOARD KIT aa ME n 2 Mes LM 380 mam ENEZ VAN 69 95 mia eo 2499 429 ma 741822 80 Sd ata TELEDYNE RE Ai 32 2102 1 fully buttered 16 address tines 7416 22 74181 1 74 526 gt 74L5173 LM386 ae 145 CONVEHI board decoding for any 4 of 64 pages standard 417 25 lt gt 74190 1 144527 mgn LM 387 MK4008P 1957 PT 1482 PSAT 605 44 pin buss may be used with 8 amp KIM p T AW e m rte zi HS Us 2101 254 4 STATIC 245 BOBDA 1 Bk 30 a 4 74C 30 LM 537 21329 6 State TR Si
177. You Need To Know E Aj i 315 Circuit P um gt k gt bgt 4 Mount STATE OF SOLID STATE continued from page 68 changes each comparator responds and produces an output signal indicating whether that particular voltage sample is above or below its respective reference voltage The 255 comparators produce a unique digital 255 bit output word corre sponding to each of the possible 256 input levels For example when the input volt age 15 at I volt midway in the input range the top 128 comparators are switched off and the lower ones are switched on producing a code of 128 zeroes and 127 ones This coded informa is compacted into an 8 bit word by the 255 to 8 bit encoder Reduction of the digital word length is possible since 256 2 levels can be completely distin guished by 8 bits The TDC1007J digitizes an analog sig nal at clock rates from DC to 30 mega samples per second MSPS It accurate ly samples signals up to 7 MHz without an external sample and hold amplifier The comparator 3 dB bandwidth is 40 M Hz The system clock is applied to the convert strobe terminal and samples the input during positive clock transitions Two additional control leads NMINV and NLINV permit the selection bi nary complemented binary offset 2 s com plement and inverted 2 s complement The maximum input capacitance of the converter is 300 pF which
178. al or the RCA capaci tance system But Japan s biggest consumer electronics manufacturer Matsushita apparently feels the stakes are too high to wait passively Matsushita s earlier videodisc system called Visc could easily have been brought into compatibility with RCA s capacitance system and most observers thought it would be It was surprising therefore when at a very late stage in the game Matsushita introduced a new videodisc system and pointedly said it was ready for production The new Visc O Pac is a variable speed disc that can store at least two hours on two sides of a 9 inch diameter record The speed varies from 300 rpm at the outside of the disc to 700 near the center Like the original Visc the new system uses grooved discs and reads them out mechanically with a twist stylus that translates the discs s hills and dales to variations in torque The new disc is packed in a transpar ent case that is automatically removed when the record is played and restored when playing is complete RCA s SelectaVision discs are 12 inches in diameter and revolve at a constant 450 rpm Each one is packed in a plastic caddy which is slid into the changer and pulled out An RCA spokesman says SelectaVision s design is fro and won t be changed to compromise with the new Matsushita system If Matsushita really intends to introduce a third standard it could have a rough road since both RCA and MCA have been
179. al the very best readings or the worst Or something in between Which would be most useful to the consumer who is thinking of buying the Luxman mode 1120 since the particular unit he gets can have a low frequency channel separation anywhere between or outside of 42 dB and 60 dB don t know which one of the two tests was made first but Radio Electronics published its results in the June issue whereas Stereo Heview included its report in the September issue thereby being the continued on page 16 WHY CUT WHY STRIP WHY SLIT WHY NOT AWG 30 Wire PENDING e 025 Square Posts Daisy Chain or Point To Point Stripping or Slitting Required JUST WRAP rw Built In Cut Off e Easy Loading of Wire e Available Wire Colors Blue White Red amp Yellow JUST TOOL WITH BY gt 50 ROLL OF WIRE COLOR PART NO U S LIST PRICE BLUE 14 95 WHITE 14 95 YELLOW JW 1 Y 14 95 RED JW 1 R 14 95 REPLACEMENT ROLL WIRE 50 FT BLUE R JW B 2 98 WHITE R JW W 2 98 YELLOW R JW Y 2 98 RED R JW R 2 98 DAISY CHAIN POINT POINT OK MACHINE amp TOOL CORPORATION 3455 CONNER ST BRONX N Y 10475 212 994 6600 TELEX 125091 MINIMUM BILLING 25 00 ADD SHIPPING CHARGE 2 00 NEW YORK CITY STATE RESIDENTS ADD APPLICABLE TAX CIRCLE 32 ON FREE INFORMATION CARD LETTERS continued from page 14 later of the two Anyway
180. ally calibrate the Cardiotach and for later recalibration FIG 5 FOIL PATTERN for the printed circuit board used in making the cardiotach The board may be cut in two and the pieces wired separately Pattern is shown half size PARTS LIST R37 82 000 ohms R38 470 ohms Capacitors C1 C6 C11 C12 C18 10 aF 16 volts electrolytic C2 C7 01 aF ceramic C3 C5 22 aF 50 volts Mylar C4 C13 C19 0 1 uF 50 volts Mylar C8 10 pF tantalum C9 C10 615 C 17 47 uF 16 volts electrolytic C14 C16 1000 zF 16 volts electrolytic Miscellaneous OED1 OPB7068 Optron 01 14914 02 03 144001 04 1144742 12 volt 1 watt Zener diode LED1 LED2 Visible red LED LED 2 not used in prototype 05 1N4733 5 1 volt 1 watt Zener diode Q1 Q2 3 2N2926 2N3904 or equal IC1 IC4 1458 or 5558 IC2 IC5 NES555 IC6 7812 or LM34UT 12 IC 78L05 IC8 74LS90 9 741 5107 51 SP8T toggle on off switch 52 SPST switch forms part of R32 53 mini PC mount slide switch M1 100 44 4 s inch meter Tt 12 6 500 mA or greater Cabinet plus assorted hardward knobs ete The author Mark Worley 3504 Mi nerva Flint MI 48504 has the following available Meter with separate dial over lay 22 50 G 10 etched and drilled PC board 12 00 Optron type OPB706 sensor only not complete assembly 6 50 A kit of the three items list
181. although it is similar to that provided by 75 ohm coaxi al cable should be driven from a low impedance source follower because of the capacitance s nonlinearity and DC bias Both ends of the reference voltage divid er are brought out to pins to give you a choice of operating level t is possible to run the converter with less than I volt across the divider but some performance specifications may be degraded as a re sult Reference voltages and are selected to set the first and 255th thresh old levels Center tap resistor is provided so that the upper or lower divid er half can be trimmed with an external resistor to permit linearity compensation for the extended temperature version Compensation is not necessary over the 0 to 70 C temperature range The TDC1007PCB video A D con verter edge connected evaluation board is designed for easy set up and hands on experience ncluded with the board are the TDC1007J A D converter IC volt age regulators and an analog input buffer amplifier with a gain of 2 and 1000 ohm input impedance The evaluation board accepts and digitizes a 1 volt peak to peak 75 ohm signal Complete layouts and schematic diagrams are given in the preliminary data sheet The TDC1007J is packaged in a 64 pin DIP rated for 2 watts power dissipation For information write TRW LSI Prod ucts P O Box 1125 Redondo Beach CA 90278 R E zd n p XS w d With your own tutor elec
182. amaha mode CR 2040 The controls are extremely sophisticated and the tone controls in particular are more flexible and precise than those found on most of the costlier separate preamplifiers and integrated amplifiers We believe that its power output rating is about as high as anyone would want in an all in one component and Yamaha s emphasis on performance and versatility as opposed to ever greater power ratings makes a lot of sense The emphasis on actual user specifications such as the NDCR ratings is also a progressive step forward though with the new IHF Amplifier Standards now in force we hope that the company will adjust their various reference levels to fit the new standards The sound quality delivered by a pair of high quality speakers hooked up to the receiver is audibly better than that produced by Yamaha s earlier receivers and that s saying quite a lot The introduction of an all DC coupled power amplifier has resulted in improved sound The distortion levels of the FM tuner rival those of the amplifier and place severe limits on our otherwise state of the art lab test equipment Yamaha has borrowed some of the circuit designs from their separate tuners and integrated ampli fiers to achieve this level of performance We have been impressed with Yamaha s philosophy of carrying major features on all their units from the most expensive to the lower powered receivers We hope that they will follow this approach in the rest of the
183. ame signal taken off at the outer diameters The variable high frequency emphasis network is used to level out the high frequency response over the entire surface of the videodisc This circuit is controlled by a DC voltage at pin 1 The control voltage at pin 1 is directly propor tional to the 3 58 MHz burst amplitude of the composite video signal The color separator module removes the burst from the video signal by keying the burst separator with the horizontal rate burst gate pulse at pin 15 The amplitude detector creates a DC voltage that is proportional to the burst amplitude As the DC voltage at pin 1 decreases the high frequency response increases The net effect is to boost the high frequen cies at the inside of the videodisc The video FM amplifier boosts the 8 MHz video FM signal and applies it to pin 3 of the module The 2 8 MHz trap removes any remaining channel I sound carrier at this point The sound circuits The sound FM signal is processed in two modules as shown in Fig 4 lt is applied to the 2 3 MHz FM demodulator on the sound demodulator I module The demodulator output is the left channel audio signal This left channel signal is applied to the electronic switch on the sound demodulator I module The 2 8 MHz FM demodulator on sound demodulator II also receives the sound FM signal The resulting right channel audio signal from the demodulator is also applied to a switch The switches are controlled by DC voltages a
184. amps Questdata a 12 page monthly software publica 74LS28N T CD4000 r 4116 10 95 gt m Pushbutton 2 5 5 An WA TB _ tor 1802 computer users is available sub PASE 2 B Em m uud Encoder 6 apr scription for 12 00 per year 74L538M 30 D4006 10 MM5280 3 00 35795 MHz 1 20 connect to your own TV with an inexpensive video 74L574M 115 04007 2 5320 295 1095 NI 7 j MM5330 5 7 Operates 5 8 Volt DC to 5 MHz modulator to do graphics and games There is a 3 chaos 39 04110 3 100 23576 MHZ 450 EM iti 9 604010 39 E 2758 MH 50 uma cB Din Ee GB Peas A New products in hardware and software 7aL 8 12N 3 04013 36 82525 2 90 57 450 Model 107 written The speaker amplifier may also used ou LEITIN gt Bui 36 91L02A 0 229 00 to drive relays for control purposes 9 D ERA MS 6 MM57100 5369 00 35 18 4 Hz 4 50 tabber 24 key HEX keyboard includes 16 HEX keys Tiny Basic cassette 10 00 on ROM 38 00 TALS ISSN 9 MCMESHA 958 450 eter S945 oad wait I L 74L5157N 57 04019 21 3 50 Clock Calendar 23 95 plus load reset run wait input memory pro original Elf kit board 14 95 TALS 2N 1 004020 Q 4100 000 Chap sage 275 TRANSFORMERS 74151638 9 C0402 102 416 18 00 100 pm edge 4 50 6 300 3 25
185. anel lights anything Runs on 3 to 15 voits DECODER VIDEO MODULATOR KIT Converts any TV to video monitor Super stable tunable over ch 4 6 Runs on 5 15V accepts std video signal Best unit on the market Complete kit VD 1 6 95 A complete tone decoder on a single PC board b Features 400 5000 Hz adjustable range via 20 turn pot voltage regulation 567 IC Usefui for touch tone decoding tone burst detection FSK etc Can also be used as a stable tone en coder Runs on 5 to 12 volts Complete kit TD 1 ME sa SPER LIGHT KIT An interesting kit small mike picks up sounds and converts them to light The louder the sound the brighter the light Completely seit contained includes mike runs on 110VAC controis up to 300 watts SUPER SLEUTH 93 A super sensitive pliter which will pick up a pin drop at 15 feet Great for monitoring s room or as general purpose amplifier Full 2 W rms output runs on 6 to 15 volts uses 8 45 ohm speaker Complete kit BN 9 POWER SUPPLY KIT Complete triple regu lated power supply pro ap vides vanable 6 to 18 volts at 200 ma and 5V at 1 Amp Excellent load regulation good filtering and small size Less transformers requires 6 3V and 24 VCT Complete kit PS 3LT SIREN KIT Produces upward and downward wail characteristic of a police siren 5W peak audio output runson 3
186. anodized finish Front panels come blank and undriiled to allow you to make panels of your own design For large quantity orders Formula International wil silkscreen print and drill panet holes at a minimal extra charge NIC1200 12hr 24 50 EA NIC2400 24 hr 26 50 EA UNIVERSAL PROTOBOARDS CIRCUIT FIT AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A 12 16V AC 50 60 Hz SIZE PRICE inDut 19 W x 25 H x 12 D 36 85 10 min snooze con 19 VI x 4 H x 12 D 45 25 trol 18 8 X x 6 72 00 16 W x 2 8 26 50 8 50 EACH 16 W x 4 8 0 33 45 BE CM 701 9 W x 24 H x 12 D 33 45 5 WIx 4 HI x 12 D 24 50 Transformer iW x 4 8 0 30 25 1 75 HICKOK LX 303 DIGITAL LCD MULTIMETER 3 digits display 200 hours 9V battery life Auto zero polarity overrange indication NEW MARK III Steps Celers LED VU Stereo level indicator kit with arc shape dis play panel This Mark III LED level indicator is a new design PC board with an 5 4 colors LED dispiay change color from red yellow green and the peak output indicated by rose red The power range is very large from 3OdB to 5dB The Mark III indicator is applicable to 1 watt 200 watts amplifier operating voltage is 3V 9V DC at max 400 MA The circuit uses 10 LEDs per channe t 15 very easy 10 COnnect to
187. ards and the developing solutions You must read the instructions for these materials Spraying your own boards requires a dark well ventilated area The fumes from these sensitizing sprays are about as heavy as any lacquer spray and except for the odors of the fumes there should be no unusu al problems Commercial presensitized boards are available for photo copying techniques Only glass or metal trays should be used with the developing solution for an exposed board Other than working in a well ventilated area you should have no problems in handling the developers used in the process THE TYPE 650 PHOTO ETCH KIT by Injectorall contains materials needed to layout and etch boards up to 3 by 4 inches Basic tools The first consideration in PC board techniques are the tools you will need for working quickly and accurately A drill is required to drill the boards not the inch handyman s type of drill but a quality hobby drill The Dremel drill with its many accessories is the best This drill has a built in speed control Low speeds are preferable when using quality carbide bits for drilling fine holes into the board You should also consider purchasing only the better quality accessories cutters buffers reamers etc They pay for themselves over a period of time because you won t need to buy replacements as often The Dremel line is excellent and readily available Carbide drill bits rather than steel drill bits
188. are a better choice for doing PC work because they outlast steel bits They have a higher initial cost but really save money over a period of time The best bit sizes are the No 58 for holes to mount sockets into and the No 65 for direct mounting and soldering DIP IC packages Other sizes also come in handy the 1 32 and the 1 16 are good to have The carbide bits tend to be brittle when compared with steel bits So do not use excessive pressure on the tool or bit when drilling the board Let the bit do the work making sure to guide it in a straight downward motion I ve used one bit for over several months that translates into several thousand PC board holes The bits do last if handled correctly If you are not sure of your skill at first perhaps you should use the steel bits until you develop confidence Steel bits don t break as readily as the carbide bits but they do become dull quickly from the PC boards A steel bit also leaves copper burrs that must be cleaned up before you can use the board The rule here is to use the steel bits until you have developed the feel for board drilling Then switch to the carbide bits for future work Dremel has a special chuck for the num bered drill bit sizes make sure to obtain this chuck along with your drill You will find that some type of PC board magnification is useful when drilling or applying the etch resistant Hobby magnifiers are readily available There is a type of magnifier th
189. asterCharge Code Account No Expiration Date Name I YY YI X lI ADI City _ State Zip tContinental U S only AK amp PR 5 00 Canada 6 50 Foreign 19 00 Airmail 676 AINE RADIO ELECTRONICS Everybody s making money selling microcomputers Somebody s going to make money servicing them New NRI Home Study Course Shows You How to Make Money Servicing Repairing and Programming Personal and Small Business Computers Wakana gt n tm _ Seems like every time you turn around somebody comes along with 4 new computer for home or business use And what s made it all possible is the amazing microprocessor the tiny little chip that s a computer in itself Using this new technology the industry is offering compact affordable computers that wil handle things like payrolls billing inventory and other jobs for businesses of every size per form household functions including budgeting environmental systems control indexing recipes and more And thousands of hobbyists are already owners experimenting and developing their own programs Growing Demand for Computer Technicians This is only one of the growth factors influencing the increasing opportunities for qualified computer technicians The U S Department of Labor projects over a 100 increase in k job openings for the decade through 1985 Most of them
190. at is placed over the head similar to a pair of glasses What appears as a very small hole to the naked eye becomes quite large when you use a hobby magnifier A good close light on the work area is needed when working with the head type magnifiers If your budget allows obtain the type of fluorescent light fixture that has a built in 4 inch diam eter magnifying surface This is a standard fixture art and PRINTED CIRCUIT KIT NO 22 297 from GC Electronics is what you need to make PC boards using the negative method hobby stores carry it or you can buy it from Lafayette Stores It represents an expense of about 50 but if you are serious about doing your own PC work this type of hobby light cannot be measured in terms of dollars For beginners try the headset from Radio Shack about 7 then consider a fluorescent magnifying light fixture at a future date A magnifying type of hobby fixture does make a major difference in the long run Along with the hand hobby drill the numbered bits and the magnifier as basic tools you must consider your work surface for drilling the PC boards I recommend using a 12 inch by 12 inch tightly pressed cork board about I C thick Lum ber suppliers carry these boards When drilling place the PC board flat on the cork surface When you drill through the PC board the bit will not have a hard surface to come in contact with and there is less chance of breaking the bit You should also have the
191. basic sections sensor bandpass amplifier Schmitt trigger charge pump meter circuit beep tone generator cali brator and power supply We ll consider the operation of each section in turn and see how they all combine into one instru ment 1 The sensor is an infrared reflective sensor manufactured by Optron Inc 1201 Tappan Circle Carrollton TX 75006 containing an infrared emitting diode and an infrared sensitive phototran sistor that are shielded from each other 6461 IC1 a amp b 01 102 SCHMITT THIGGER sj xO CA LIBRATE OPERATE J POWER SUPPLY IC8 C9 Lim 12V 5 SOURCE 11 117VAC 02 03 106 04 12 SOURCE CALIBRATE CIRCUIT FIG 2 BLOCK DIAGRAM of the cardiotach Infrared optoelectronic sensor detects pulses in blood flowing close to the skin surface and interprets each pulse as a heartbeat by a barrier see Fig 4 The transparent cover allows the infrared emission to be coupled back to the transistor via reflec tion or conduction from a nearby surface In this application the transparent face of the optocoupler is held against the skin As blood pulses through the body the infrared sensitive phototransistor re R5 1 MEG C2 12V 01 69 47 pF C10 FROM 163 gt 4 R18 R19 100K 100K 12 C11 V2MC 1458 166 iir 7812 IC7 78105 IN TOUT 0VIIIIM GND GND d ARE S 12 6VAC 1000uF 500mA
192. called absolute zero Absolute zero is the coldest possible temperature where mo lecular motion is at a minimum The rela tionship between the Kelvin Celsius and Fahrenheit scales is as follows T C 273 2 T F T C 32 T PK 2732 327 There is also a little used Rankine tem perature scale that starts at absolute zero with Fahrenheit size degrees and is offset 459 7 from the Fahrenheit scale Ran kine to Fahrenheit conversion is as fol lows T F 459 7 When the output current of the ADS590K is passed through the appropri ate value scaling resistor the resulting output voltage is proportional to the Kel vin or Rankine temperature as shown in Fig 1 The scaling resistors can be com bined as shown in Fig 2 so that K or R can be switch selectable and read from a voltmeter To generate an output voltage that 15 proportional to the more common Celsius and Fahrenheit scales we need to subtract 2 732 volts from the K output TABLE 1 DIGITAL THERMOMETER SPECIFICATIONS Range 50 150 Celsius 60 200 Resolution Sensor Linearity Meter Error Accuracy Probe Inputs Sensor Probe I IC 0 1 F 0 5 C 55 to 150 C 1 count 0 1 C Linearity error calibration error meter error Two switch selectable Number 2 Type ternperature dependent current source Response time 3 4 seconds to reach 63 2
193. card 149 95 RE 6416 terminal card 189 95 ower Case 4 Try your hand at building the finest looking Power Supply Kit 14 95 1 clock on the market Its satin finish anodized Video RF Modulator VD 1 6 95 aluminum case looks great anywhere while six 4 Assembled tested units add 60 00 LED digits provide a highly readable display This is a complete kit no extras needed and it only takes 1 2 TRAN E Sar Dm SESS SS hours to assembie Your choice of case colors silver gold bronze biack blue specify CALENDAR ALARM CLOCK Clock kit 12 24 hour DC 5 22 95 The clock that s got all 6 5 LEDs 12 24 hour Clock with 10 min 10 timer 12 24 hour snooze 24 hour alarm 4 year calendar battery DC 10 47 95 backup and lots more The super 7001 chip 15 used Alarm clock 12 hour enly OC 8 24 95 Size 5x4x2 inches 12V DC car clock 7 47 95 Complete kit less case not available For wired and tested clocks add 10 00 to kit different ways using 2 sided tape Choice of silver black or gold case specify DC 3 kit 12 hour format 22 95 DC 3 wired and tested 29 95 110V AC adapter 5 95 our Best Seller your Best Deal S ums Under dash car clock 12 24 hour clock in a beau titul plastic case features 6 jumbo RED LEDS high accuracy 1min mo easy 3 wire hookup display blanks with ignition and super instructions Optional dimmer automatically adjusts display to amb
194. ceivers at predeter mined frequencies The FM 2400CH with its extended range covers 25 to 1000 MHz The frequencies can be those of the radio frequency channels of operation and or the intermediate frequencies of the receiver be tween 5 MHz and 40 MHz Frequency stabitity 0005 from 50 to 104 F Frequency stability with built in thermometer and temperature cor rected charts 00025 25 to 125 000125 specia 450 MHz crystals available Tests Predetermined Frequencies 25 to 1000 MHz Extended Range Covers 950 MHz Band Pin Diode Attenuator for Full Range Coverage as Signal Generator Measures FM Deviation FM 2400CH meter only Cat No 035320 627 72 RF crystais with temperature correction 26 26 ea RF crystals less temperature correction 19 93 ea IF crystals catalog price INC INTERNATIONAL CRYSTAL MFG CO 10 North Lee Oklahoma City Okla 73102 CIRCLE 58 ON FREE INFORMATION CARD For faster service USE CODE on all mail THE GOVERNMENT CAN DO EVERYTHING THE UNITED DOES ONLY THEY WRAP IT UP FOR YOU IN NICE RED RIBBON MILESAND MILES OF IT cp ese m eT p L 5 T J T3 A stb ds One of the best things about United Way is not what it does but what it doesn t do For instance because United Way is run almost entirely by volunteers it is able to return an amazing 8 of e
195. ces sor And with the ELF BUG Monitor instead of single stepping through your programs vou can now display the entire contents of the registers on your Ty screen You lind out immediately what s going on and can make any necessary changes The incredible ELF II Light Pen lets you write or draw anything you want on TV screen with just a wave of the magic wand Netronics has also introduced the ELF II Color Graphics 8 Music System more breakthroughs that ELF II owners wete the first to enjoy ELF Il Tiny BASIC Ultimately ELF II understands only machine language he lundamental coding required by all computers But to simplify your relationship with ELF II we ve introduced an ELF II Tiny BASIC that makes communicating with ELF breeze Tiny BASIC saves you the time of having to code your individual instructions In machine language for ELF Instead you simply type instructions on a keyboard PRINT RUN LOAD ETC Your Tiny BASIC program automatically translates them into machine language for ELF II Then it translates ELF 15 output back into simple words and symbols for you Now Available Text Editor Assembler Disassembler And A New Video Display Board The Text Editor gives you word processing ability and the ability to edit programs or text while it 15 displayed on your video monitor Lines and charac ters may be quickly inserted deleted er changed Add printer and ELF II can type letters for you error free pl
196. ck to JE200 board includes components y SORE hardware amp instructions 5129 36 X2 X 9 16 h JE200 14 95 size 3 x5 x2 H 205 12 95 CAN Bl USED AS REMOTE CONTROL 08 u t VOR YOUN NOOA Cri Ni h TRAESMITE 36 TWLEN AND 41 r its a THOUSANDS USES FOR REMOTE CONTROL APPLICATIONS TRANSMSTTER USES A bY BaltERY 19 95 SCHEMATICINCLUDEO This is a 63 key terminal keyboard newly manufactured by a large computer manufacturer It is unencoded with SPST keys unattached to any kind of PC board very solid molded plastic 13 x 4 base suits most application IM STOCK 29 95 each 10 00 Minimum Order U S Funds Only Spec Sheets 25e Digital Stopwatch Kit Residents Add 6 Sales Tax 1979 Catalog Avallable Send 41 stamp Use Intersit 7205 Chip _ gt P C Board L ORDERS Hexadecimal Times to 59 min 59 59 sec with auto reset WELCOME Unencoded ELECTRONICS 415 592 8097 Quartz crystal controlled Three stopwatches in one single event split Keypad _ MAIL ORDER ELECTRONICS WORLDWIDE 19 key pad includes 1 10 keys Size 4 5 x 2 15 x 90 900 39 05 1021 HOWARD AVENUE SAN CARLOS 94070 ABCDEF and 2 optional keys and a JE ADVERTISED PRICES GOOD THRU JULY shift key 10 95 each CIR
197. cluded for the automotive service facility CompuCruise units are fully operable on most foreign or American cars trucks or RV s At 199 95 the unit is only a few dollars more than the cost of cruise control alone on most vehicles yet offers a whole new worid of com puterized management functions This is an exclusive system fully warranted for 90 days from installation delivered to you complete with all required hardware You need only basic tools for the total job When you receive your unit inspect it com pletely If you are not 100 satisfied return the complete unit before installation and your money will be refunded without question TO ORDER YOUR UNIT complete the coupon below enclosing 199 95 ADD 5 50 if front wheel drive This covers all shipping insurance and handling costs Your unit will be shipped within three weeks NOTE Mountable on foreign or domestic vehicles including standard trans EXCEPT FOR DIESEL OR FUEL INJECTED ENGINES TO ZEMCO Inc 12907 Alcosta Blvd San Ramon Ca 94583 CompuCruisery units 7 199 95 Model 44 WITH CRUISE CONTROL Add 5 50 for front drive CompuCruiseru Units 159 95 Model 41 WITHOUT CRUISE CONTROL Add 5 50 for front drive Total enclosed CA residents add Sales Tax 415 838 8060 Ship Ship Charge to my Master Charge Visa Card Number Date Expires Signature Make vehicle Name Address City State amp Zip 646 Ann
198. coils in sequence so as to cause the particles to accelerate toward each other They enter the black bodied oven via two small ports and collide If the accelera tion is sufficient to produce the required pressure to cause the particles to become greater than their greatest possible density to interchange themselves with energy what results is a very small very hot ball of Sharp Enough raw power Those elements that can radi ate through a vacuum i e light will do so and will be converted to heat upon reach ing the oven The rest will be contained in the ball It can then be tapped by allowing a measured air pressure into the oven The heat can be used to produce steam Now here come the electronics We need a humdinger of a real fast computer to determine when the coils are to be switched on and off or the particles will not accelerate sufficiently It must also keep both particles in the dead center of the tubes or they won t intercept each other To do this it will have to sense the position of the particle and adjust it with the deflec tion yokes Furthermore the computer will have to adjust for any differences in the relative velocities of the two approaching To Cut A Human Harr Tough Enough To Cut Piano Wire A precision cutting tool with muscle to match NM Perfectly mated cutting edges hand honed sci entifically hardened Jaw opener coiled spring a great help on repetitive jobs Drop forged fi
199. com ponents necessary for on board operation Including 6 2114 rams BUG KIT II 149 95 MIC 0 CHROMA 68 KIT 129 95 PC BOARD SEPARATE 545 No shipments to ARATE 545 00 Mg ADDITIONAL 2114 RAMS 8 50 Calif Comes complete with built in IR source and BUY THE MICRO CHROMA 68 AND THE BUG KIT t NOW SAVE 15 00 SEND FOR OUR NEW CATALOG f adjustable focus lens WHICH INCLUDES GREAT BARGAINS ON ASCII KEYBOARDS MODEMS SPL 21 199 00 COMPUTER POWER SUPPLIES AUSTIN ELECTRONICS EEE E E 1536 EAST ANDERSON LN SUITE E AUSTIN TEXAS 78752 All items FOB Lynn Mass Send for free 72 page Catalog jam packed with goodies Micro Processor Power Supplies Brand New 60 Discount Send for List Meshna Inc PO Box 62 E Lynn Mass 01904 CIRCLE 43 ON FREE INFORMATION CARD NEW DIGITAL MULTIMETERS TERMS Check or money order NO COD s Texas residents add 5 sales tax Overseas countries 1 512 836 9677 add 5 90 for surface rates Jii TiL CIRCLE 35 FREE INFORMATION CARD Test Instrumentsi OSCILLOSCOPES The 30 MHz Dual Trace Oscilloscope with Delay 5mV sensitivity Built in delay line Singie shot trigger CH 1 2 5 P D A CRT assures brighter sharper trace 20 nS cm sweep capability plus 11 7 nSec rise time LIST PRICE 1050 OUR C 5888 25 MHz Dual Trace
200. d between the main board and the calibrator power supply board If the PC board is cut in two and mounted separately the jumpers will of course have to be longer Additionally run a 110 My BPM C FIG 8 METER SCALE can photographed full size cut from the pages of this magazine and cemented directly onto the face of a 4 inch 100uA meter GND LEAD T CASE SPKR GND 115VAC INPUT TO LINE CORD CONDUCTIVE FOAM CUSHION SURROUNDING SENSOR STICKY SIDE OF VELERO 3 V2 LENGTH SILICONE ADHESIVE V2 LENGTH STICKY SIDE OF VELCRO FIG 7 HOW THE SENSOR 15 ASSEMBLED Connecting circuit leads are not shown jumper between the output of the calibra tor R36 and the junction of C5 and EE Install the board or boards with the necessary connections to the input jack gain potentiometer meter etc in the enclosure Assemble the sensor as shown in Fig 7 using a small piece of perforated board measuring X Ys inch Note that pins 2 and 4 Fig 4 of the sensor are jumpered Use shielded two conductor cable or jacketed flexible three conductor cable a 3 to 4 foot long section is sufficient Connect a stereo phone plug to one end of the piece of cable and the sensor assembly to the other end A piece of conductive foam plastic of the type used to protect MOS devices can act as a cushion and as a continued on page 82
201. d from page 46 boiling point This method of equalizing the error over the temperature range 15 sometimes referred to as splitting the rock Place both sensors in a pot of mineral free water distilled if necessary and after it is freely boiling adjust R16 for Sensor A and R20 for Sensor B for 100 0 C R14 and R18 should be set at mid range If you are very far above sea level then it may be necessary to make an altitude correction For the freezing point of water mix crushed ice with an equal amount of cold water Stir the mixture for several min utes you should observe the temperature reach a low point and stabilize for several minutes when equilibrium is reached If it measures right on 0 0 C then you finished with calibration II the tempera ture is below 0 0 C then adjust trimmers R16 and R20 until the amount of error is reduced by a half splitting the rock li L3 SWITCHES are mounted on Side 2 of the PC board and protrude through top of the case Next place the sensors in tap water and allow them to come to equilibrium at room temperature Use the conversion equations and calculate the Fahrenheit temperature from the indicated Celsius temperature Adjust 14 and R18 for the correct Fahrenheit temperature Figure 12 shows the sensor linearity error over several different temperature spans In order to achieve these accura cies Over reduced spans an accurate ther mometer
202. ded gt J a 75e each 4 SPDT 5 Amps c 125 Voits 1 15 each 10 for 10 00 10 MEG POTS 1O K LINEAR e Standard 1 4 Wott Size SLIDE POTS 3 8 Long Shan 3 Long _ 75 each 1 4 Dio I 4 tar 1 00 CORNELL DUBILIER COMPUTER GRADE TANTALUM CAPACITOR 150 000 MFD 15 VDC 150 MFD 30 VDC 3 Dia 5 High 3 4 Long 3 8 Dia 18V Surge 3 50 each Axial Leads 75 each ALL ELECTRONICS CORP SEND FOR OUR FREE FLIER 905 S Vermont Ave Quantities Limited Los Angeles CA 90006 Min Order 5 00 213 380 8000 Add 5150 Shipping USA Calf Res Add 6 Same Day Shipping with Cert Check ar M O Store amp 5 Hours 5 PM Monday thru Friday _ CIRCLE 37 ON FREE INFORMATION CARD YOU RE UNDER SURVEILLANCE HOST OF PEOPLE AGENCIES AND COMPUTERS ARE BUSY SPYING ON YOU AND YOUR BUSINESS EVERY DAY OFTEN ILLEGALLY HOW TO STOP IT OR DO IT BACK BIG BROTHER c A A Large Format 8 x 11 Quality Paperback 240 Pages BUGGING WIRETAPPING 1 95 TAILING BB OPTICAL AND ELECTRONIC SURVEILLANCE SURREPTITIOUS ENTRY DETECTIVE TECHNIQUES WEAPONS COUNTERMEASURES A VIRTUAL ENCYCLOPEDIA ON SURVEILLANCE EVERYTHING YOU VE ALWAYS WANTED KNOW ABOUT SPYING PLAYBOY MAGAZINE With this order FREE SHOPLIFTING BOOKLET FOR DETECTIVES p
203. derable teaching experience Those want ing the full value of an education in binary counting and TTL theory can assemble a small section of the kit then test it using a multi meter and oscilloscope with the manual explaining how everything works This is called Mode I For those who just want to build the kit and don t have any particular interest in TTL theory Mode II is provided In Mode you perform the printed steps New RCA SK Solid State Replacement Guide e Largest RCA SK Replacement Guide to date e Over 950 SK types replace over 153 000 domestic and foreign types e Everything you need under one cover for quick easy profitable servicing e Theindustry s only Guide to include SK numbers and the other leading numbering system The new 1979 RCA SK Solid State Replacement Guidehas easy to find easy to read information on RCA s full line of replacement transistors rectifiers thyristors inte grated circuits and high voltage triplers Thousands of hours of engineering went into the preparation of this guide which covers consumer commercial and industrial applications SK Replacement Solid State RADIO ELECTRONICS gt Mode II you only read and perform the steps that are printed in red The manual is printed throughout in two colors has over 100 explicit illustrations and diagrams and contains virtually no errors Ex ceptions On page 34 step 5 refers to Fig 49 but should refe
204. ding of data from memory t k 995 n p and starting programs The UT4 program recognizes three commands corresponding to each of these functions After pressing the RESET and RUN U push buttons type either a carriage return or a line feed depending on whether your terminal is Le a 0 C L66 C connected for full duplex or half duplex opera tion Full duplex operation requires the com YE Ld puter to echo back characters typed on the E keyboard to the printer since the two terminal 645 functions are completely isolated Based on the first character typed the utility program sets up to echo or not and calculates the bit timing necessary to talk and listen to the terminal Figure 1 shows how the three command repertoire works First you enter a program either from the keyboard or trom punched paper or magnetic tape The command 15 the write memory command which is immedi Tri d Displ ately followed by the address where the input riggering an 15 d this 9 0000 The sould inthis ase or 0000 Controls 8x10 CRT data Next the program instructions or data are entered in hexadecimal format with cach two characters accounting for a single memory word In hexadecimal or base 16 format addi Send for Complete Data tional symbols are needed for numbers be NNIVE All Leader Instruments Backed by a Two Year Warranty tween 10 to 15
205. ducts 62 1379 4 95 Semiconductor Reference and Application RAM Memory ICs Under 450 nS Access Time 2102 1024 x 1 Array Low cost static memory chip 16 pin DIP Buy 8 and DI Everything you need for making high ave uality custom PC boards 276 2501 2 49 Ea or 8 14 95 276 1576 7 95 icati 2114L 1024 x 4 Array NMOS static Extra Resis Pen 276 1530 1 29 Handbook Complete Specs and applications for opular IC transistors diodes 276 4002 1 95 RAM 18 pin DIP 276 2604 1295 extra Etching Solution 276 1535 2 19 NEW LEDs Molded Connectors Tri Color Flasher k s Digital Project Accessories Bezel with Lens High contrast filter for LED displays 39 x 1 lens opening 270 301 3 95 amp Deluxe Molded Display Case Red lens Mount up to four 0 6 or eight 0 3 LED digits With brackets 113 x314x47 7 270 285 3 95 1003 Clock Case For car clock modules Accepts 3 pushbut ton switches not inc With brackets blue lens 3V2X2MX2 C 270 303 5 95 Rated 250V Standard 093 pin diameter Fig Pins Each Cat No 4 274 224 99c B Female 274 234 99c 61 274 226 1 19 B 274 236 1 19 A 91MWale 274 229 1 39 B 9 Female 274 239 39 A 12 1Maiel 274 232
206. e of pin Insert the hinges into the bottom of the drawing board and line them up with the edge of the desk Screw the hinges into the desk edge Taking out the hinge pins permits the draw 6261 m RADIO ELECTRONICS ing board to be removed from the desk surface You can replace the board when you make your drawings You can use a box beneath the back edge of the board to angle it to suit your needs You have not only saved the costs of a separate drawing table and boards you have created a convertible drawing table or desk work area In the area of drafting and art supplies it is possible to skimp somewhat A wooden T square is just as good as a 15 steel one and costs about 2 A drafting pencil costs about 2 and uses a fine 005 inch thick lead Why bother with standard wooden drawing pencils and sharpeners with a lead this fine Angles templates and other drafting tools can be standard rather than fancy instruments Quality erasers should be used and a brush is useful to clean up the work area If you are going to make ink drawings of your own positives or negatives for PC copy work then get the best pens Pelikan pen sets with various nibs are best and can be used with a China type of permanent ink This China ink by the way adheres to plastic film and Mylar film it is permanent and extremely dense You should also have quality bond paper and drawing paper Layout bond paper is good and holds in
207. e 1 The AM section uses minimal circuitry only a two section tuning capacitor and the frequency response shown in Fig 7 is about as poor as that found in most high fidelity receivers Sensitivity when we used the sup plied antenna loop was quite good however as were the signal to noise ratio 50 dB as claim ed and the distortion reading it measured 0 5 for 30 modulation f F i I di a m K i 1 p Nees 1 4 E d a gt Kue gt C pur clan fig Pa T a s m F E pote m gt e me i a m mmm mp zr Amplifier measurements Table 2 shows the results of measurements on the power amplifier and control sections Yamaha has been extremely conservative in rating the power output at 120 watts per chan nel The unit could easily have been rated as a 140 watt per channel unit into 8 ohms and have still complied fully with the Federal Trade Commission Rule on power disclosure for audio amplifiers Note also that the refer enced or rated harmonic distortion level is a mere 0 02 The input sensitivity and signal to noise val ues shown in Table 2 cannot be compared directly with published claims since we now use IHF Standard reference levels and weight ing n
208. e Evaluation Kit although a simple keyboard or switch interface can be designed Board dimensions are 14 X 9 7 inches includ ing fully decoded prewired locations for expan sion to 4096 bytes of random access memory RAM and a 6 X 4 inch user area wired to accept standard DIP packages Three edge connectors provide access to the microprocessor pins and the user input output I O area and connect to external power sources and peripheral devices The kit comes with a 2 MHz crystal which for the 16 and 24 clock period instructions calculates to 8 us or 12 us execution times 6 4 MHz oscilla tor reduces these values to 2 5 and 3 75 us A 512 byte ROM is assigned address space from 8000 to 81 FF and permanently stores the UT4 monitor program 32 word RAM start ing at 8COO is used by the utility program to store register contents Two supplied RAM IC s fit into the first two locations in the 4K memory area for an initial 256 word user programming space System operation is controlled by three pushbuttons and a toggle switch The RESET pushbutton intializes the CPU and control logic RUN U Run Utility gives control to the ROM monitor program by starting execution at 8000 The RUN P Run Program pushbut ton starts program execution at 0000 where the first user s program instruction is usually entered The CONTINUOUS STEP toggle switch lets the user choose between the normal clocked mode or single cycle operation where
209. e alone with its built in ribbon controller or to use with guitar electronic piano polytonic keyboards etc The perfect introduction to electronic music and best of all the Gnome is onl 59 95 in easy to assemble kit form Is it any wonder why we ve sold thousands 59 95 plus 2 00 postage GNOME MICRO SYNTHESIZER Fully Assembled 100 00 plus 2 postage Send FREE CATALOG name city 4 stat zip BAC VISA MC cardno DEPT 7 R 1020 W WILSHIRE OKLAHOMA CITY OK 73116 em p e pp ppl mme S CIRCLE 22 ON FREE INFORMATION CARD Put Professional Knowledge and a COLLEGE DEGREE in your Electronics Career through Earn Your DEGREE by correspondence while continuing your present job No commuting to class Study at your own pace Learn from complete and explicit lesson materials with additional assistance from our home study instructors Advance as fast as you wish but take all the time you need to master each topic The Grantham electronics degree pro gram begins with basics leads first to the A S E T degree and then to the B S E T degree Our free bulletin gives complete details of the program itself the degrees awarded the requirements for each degree and how to enroll We are located at 2500 S LaCienega B1 Los Angeles Calif Write to our mailing address shown below for Bulletin R 79 Grantham College of Engineering P O Box 35499 Los Ang
210. e boards is quite thin and the board is flexible Push ing and pulling on the board showed up more bad joints We decided that the reason for the reaction in set No was that pulling 1C302 out of the socket and putting it back had exerted enough pres sure on the board to make some of the bad joints at least temporarily The sets described here are Wards Airlines chassis Nos GGY 16218A GGY 16218B and GGY 16231A and B They are stamped or labelled Made in Juarez Mexico If you experience this problem or any others in any of these chassis it would be a good idea to exam ine all the solder joints on the underside of the board especially around those ground lances Not long ago I received a letter asking about a completely unknown TV set manufactured in Singapore or somewhere in the Far East This set was sold by a New Orleans discount distributor No data could be located on it at all Several months later the technician wrote saying got tired looking at the thing on bench and jerked it out of the cabinet Looking it over there were bad solder joints all over the place So many that kept track finally remade 47 of them Now the blankety blank thing is work ing A warning note on this appeared in Reader Questions a while ago but repetition never hurts Another difficulty that turns up regu larly is contact problems in modular sets If this happens make sure to check al contacts on the module involv
211. e frequency either 50 Hz or 60 Hz jumper selected so this clock provides long term accuracy since pow er companies keep a close tolerance on the average output frequency The model 540 Binary Clock sells for 39 95 in kit form including the manual post paid in the United States from Graymark International Inc 1751 McGraw Ave Dept RE Irvine CA 92714 Foreign orders add 6 postage and handling California residents add state and local taxes as applicable The manual is available separately for 2 R E BSR System X10 AC Remote Control CIRCLE 102 ON FREE INFORMATION CARD HERE IS A REMOTE CONTROL SYSTEM THAT gives you at your fingertips complete control of the lights and appliances in your home with out getting involved in any special wiring You use the house wiring as the signal carrying system For example if you suddenly hear a strange noise downstairs you push a button on the control unit and it turns on the lights With the BSR System X10 light and appliance com mand console by your bedside or chairside you can turn lights on and off dim or brighten them at the touch of a button You can even use the System 10 to trigger a simple alarm device Using this system you can literally operate almost every light and electrical appliance tn your home without leaving your easy chair That means you can turn air conditioners on and off as well as TV s stereos or lights The basic system comes with a command
212. e generated waveforms with the pattern To provide a stable overlap of the generated and plot ted patterns you will find it helpful to sync the scope from the triangle output of the timebase generator Use the manual trigger level rather than auto Also try switching S8 to INVERT If your scope has a dual trace feature try it The peak of the antilog function is easy to locate the low point of the valley is not The method used here makes it easy to establish the end points of the antilog function Adjust R401 and R403 so that the antilog waveform has approximately the same span as that provided by R11 sweep voltage without clipping at the peaks Use the scope s vertical attenuator to fit the generated waveform to the plotted antilog function Adjust R401 and R403 for the best visual match between the generated and plotted waveforms Note the effect each movement of each pot has on the generated waveform This completes the rough adjustment of the antilog waveform Fine tuning comes later At this point everything is at least approximately calibrated so that the timebase will sweep the audio sweep gen 646 A Inr RADIO ELECTRONICS m erator either manually or automatically in linear and logarithmic modes Now to calibrate the manual sweep control Set 53 to 100 and R1 to its lowest position Set S4 to the SYMMETRICAL upper position Set 59 to SWEEP At this point we will use the audi
213. e you buy check our prices 800 645 9518 INC ADD 3 00 TO ZOVER In N Y State call 516 752 0050 Fearing WW SING 66 YOUR ONE STOP DISCOUNT CENTER Res add approp We Will Beat Any Master Charge Bank Americard Visa C 0 D s accepted sales tax Send f 1979 f over 3 000 items 164 ipment Advertised Price FREE Call TOLL FREE CONTINENTAL SP 100 MHz 8 Digit Counter 119 00 He p ej LED n Automatic _ Sinclair PDM35 digital MultiMeter e 3 2 digit resolution Sharp bright LED display SENCORE TU VTR MATV Model 6500 SOOMHZ Prescaler 52 9 MEE m Digital x _ 85 Changer 59 95 52 95 pacitance Meter 2 ARS i ola Devices 24 95 P Wiremote Cri E Model 1400 199 99 Se Overhead Protected Batter ryor i 3 hgh LED Display d 3 Model 2800 130 00 i V 150 TIP comes complete with tesi 85 51 10 50 820 y Quick Charge leads Operating manual and spare luse 27 95 7500 Cordless Soldering Iron 17 95 5800 Thermal Spx Teste 22 50 Automaticalty displays static and dynamic 10946 e Works wiin DIL HTL TTL and CMOSe 16 LED displa
214. ed Try taking the module out and putting it back If doing this clears up your symp tom or changes the symptoms at all check those contacts Clean and tighten all contact springs etc If you suspect a certain module and replacing the module clears up the trouble always try putting the old one back and see what happens I believe this is why factory service people complain that technicians are sending back perfectly good modules One manufacturer whose name forgotten luckily sent out a bulletin on a certain chassis with a contact problem The recommended fix was to solder that contact hope that this will help somewhat in alerting you to some of these problems so that you can do something about it Knowing these things can save both you and your customers money R E service questions ERRATIC SYNC The syncs were quite erratic in this GE CD chassis It looked like a defective sync separator was causing the problem When the picture locked in there was a slight shift to the right in sync After some checking the 39K resistor R251 was found to have greatly increased in value This reduced the amplitude of the hori zontal sync pulse to the AFC unit This in turn caused sync and AGC problems Thanks to Leon Caldwell Caldwell TV Mena AR CORRECTION NOTED I recently wrote J G of Tucson AZ that I couldn t find a substitute for Am bassador flyback No A 29056 A At the time this was correct Mr Wi
215. ed here is 37 50 prices are postpaid The enclosure is available from Trace well Enclosures Inc 7032 Worthington Galena Road Columbus OH 43058 Model H457 18 35 plus 2 00 shipping and han dling Will be shipped UPS collect upon request For further details call 1 B00 B48 4525 6461 RADIO ELECTRONICS TO LED 2 NOT USED IM PROTOTYPE AU DRILL FOR 4 SCREW TO R32 DNLY IF NOT MOUNTED VOL CONTROL IN TRACEWELL ENCLOSURE 52 TO R9 SENSITIVITY 0R 10 GAIN CONTROL E D um fed ptt itc BREAK FOIL M1 M1 HERE TO TP ADD R37 FIG 6 HOW PARTS ARE PLACED on the PC board Note pads that are used for making connections to meter and other parts that are not mounted directly on the board checks Regulator IC7 is a low current 5 volt regulator used to power the circuit IC8 and C9 together divide the 60 Hz frequency by 40 to yield a 1 5 Hz output and R35 and 05 limit and square the 60 Hz sinewave into suitable digital levels for TTL IC s Standard TTL IC s can be used instead of L or LS TTL types but at an increased current drain from the nomi nal 10 to 12 mA 8 The power supply is a straightfor ward half wave dual polarity supply The 12 volt current drain is less than 100 mA while the 12 volt drain is less than 10 mA thus eliminating the need for more elaborate rectification or filter ing Voltage regula
216. ees Celsius High accuracy and the advantages of custom design in the LSI circuits have meant that modern digital multimeters have a place in engineering circles similar to that of an electronic calculator in general use The LSI circuitry in the multimeter controls both the analog to digital conversion and the numeric display as well as being able to measure current voltage and resistance The tempera ture sensor in the probe is a resistive element varying in value from approximately 27 ohms at 60 C to approximately 62 ohms at 200 C Temperature checking Temperature checking is necessary in general servicing for any appliance where temperature is a target high or low Freezers refrigerators air conditioning washing machines and dishwashers all need temperature regulation In more general electrical servicing fields temperature checks are necessary on motors bearings and power switch contacts to locate problems before they become serious thus insuring long life A design and service tool Many equipment faults are due to overheating An amplifier producing 1 watt of useful power consumes several watts This extra power has to be dissipated as heat Most components have a limited temperature range so temperature checking is essen tial to locate and remove unwanted hot spots Some form of temperature measurement is essential in the design stage to insure the correct rating of components heat sinks and ventila tion Te
217. ei ther can be used to provide a manual frequency sweep of the audio sweep gen erator Earlier we set aside fine tuning of the manual timebase We will take that up now This procedure uses the frequency counter as the calibration standard for the sweep circuit It is the voltage levels that will be calibrated so the frequency count er can be considered as being a digital voltmeter Proceed as follows Set 511 10 MANUAL Sweep R6 through its maximum travel and check the end point fre quencies Adjust R502 and R503 for the de sired end points R503 sets the total sweep width R502 affects mainly the low frequen cy end point Connect the scope to the output of IC501 Set the vertical amplifier for 1 volt per division and adjust the trace for one division from the top of the screen with no input Run R6 through its full range and note the end point voltage levels Set the timebase frequency to 1 kHz Set 54 to SYMMETRICAL and 59 to SWEEP Set 512 to LINEAR and S11 to Sweep You should now see a triangle wave that can be positioned and scaled by R10 and 11 so its peaks correspond to the end point voltages developed by sweeping R6 through its full travel hy R502 R206 R209 R224 R225 R223 Switch 12 to Loa R8 the front panel HIGHLOG set control to the end of its travel at maximum sweep width Now back off 3 turns Plot an antilog function Fig 18 on the scope screen and align th
218. el required to arrival and actual fuel remain ing Battery condition can be checked regularly saving you from the potential embarassment of being stranded without warning TYPICAL DATA Cruise Control Time E T Lap Timer Alarm Time Distance Fuel to Arrival Time Distance Fuel to Empty Time Distance and Fuel on Trip Current or Average MPG GPH Fuel Used Distance since Fillup Current and Average Vehicle Speed Inside Outside or Coolant Temperature Battery Voltage English or Metric Display c comeUcrUse m Technically competent personnel available to answer your questions CIRCLE 17 ON FREE INFORMATION CARD COMPUCRUISE DIGITAL QUARTZ CRYSTAL TIME SYSTEM IS INCREDIBLE CompuCruise digital time system performs four independent time functions encompassing a stop watch and lap timer functions b hours minutes and seconds c alarm or warning func tion and d trip time indicator The time system Operates full time whether your vehicle is operating or not It will even wake you up after a short roadside nap YOUR COMPUCRUISE IS SMART IF YOU PUSH THE WRONG BUTTON II WILL LET YOU KNOW BY DISPLAYING ERROR COMPUCRUISE WORKS ON FOREIGN OR AMERICAN CARS IS PRICED FOR THE AVERAGE MAN S BUDGET You do it yourselfers can readily install the unit but complete and detailed instructions are also in
219. eles California 90035 Worldwide Career Training thru Home Study CIRCLE 64 ON FREE INFORMATION CARD Send GNOME MICRO SYNTHESIZER Kit E E E gt m 1 amp F t 4 E om amp W ltU OR A de ae Ae PLE 8 4 i a i F s gt gt UL X aum More information on new products is available from manufacturers of items identified by a Free Information number Free Information Card is inside the back cover DIGITAL MULTIMETER mode 3030A is a 7 function 3 4 digit instrument that offers true RMS response over a 20 Hz 50 kHz bandwidth plus 10 milliohm 10 mV and 10 nA resolution The unit measures AC DC voltages from 20 mV to 1200 volts AC DC current from 20 pA to 2 resistance from 20 ohms to 20 megohms and has a 60 dB level range Features include EMI shield CIRCLE 151 ON FREE INFORMATION CARD ing ohmmeter circuit functions on all ranges front panel zero adjust control and bright orange 0 43 inch LED display All ranges are overload protected An optional rechargeable battery pack is available other options include 100 120 220 240 volt operation and BCD out put probes carrying case and rack mounting The mode 303A comes a rugged plastic case weighs Ib 8 oz measures 8 W X 8 V D X 2 s inches H P
220. eo uV dBf Maximum S N ratio mono dB Maximum S N ratio stereo dB Capture ratio dB AM suppression dB Image rejection dB IF rejection dB Spurious rejection dB Alternate channel selectivity dB FIDELITY AND DISTORTION MEASUREMENTS Frequency response 50 Hz to 15 kHz dB Harmonic distortion 1 KHz mono Harmonic distortion 1 kHz stereo Harmonic distortion 100 Hz mono Harmonic distortion 100 Hz stereo Harmonic distortion 6 kHz mono Harmonic distortion 6 kHz stereo Distortion at 50 dB quieting mono Distortion at 50 dB quieting stereo STEREO PERFORMANCE MEASUREMENTS Stereo threshold uV dBf Separation 1 kHz dB Separation 100 Hz dB Separation 10 kHz dB MISCELLANEOUS MEASUREMENTS Muting threshold uV 981 Dial calibration accuracy kHz at MHz EVALUATION OF CONTROLS DESIGN CONSTRUCTION Control layout Ease of tuning Accuracy of meters or other tuning aids Usefulness of other controls Construction and internal layout Ease of servicing Evaluation of extra features if any OVERALL FM PERFORMANCE RATING FM T TYPE AM LOOP ANTENNA FM EXTERNAL ANTENNA M 50 309 COAXIAL FEEDER LINE SPEAKER SYSTEM A R E Measurement 1 9 10 8 4 2 17 7 2 4 12 8 33 0 35 6 86 75 See text 83 50 local 0 3 0 045 0 045 0 055 0 055 0 12 0 12 0 75 0 28 3 0 14 7 55 53 4
221. er Opportunities in Electronics Since 1914 before commercial radio was even on the air NRI has been the way to learn new electronics skills Today s modern offerings include in addition to three different computer courses TV Au dio Video Systems Servicing with training on the only designed for learning 25 diagonal color TV with state of the art computer programming Or check out our Complete Communications Course preparing you to enter this booming field servicing installing and repairing equipment like microwave broadcast CB shortwave radio paging radar and more Mail Postage Paid Card for Free Catalog No Salesman Will Call Send today for your free copy of our 100 page full color catalog It describes all of our electronics courses in detail show ing kits equipment and lesson plans Look it over at your convenience then decide how NRI can help you make the most of your talents There s no obligation and no salesman will ever call or bother you With more than a million students and unmatched experience in home train ing NRI gives you the most in training for new opportunity If card has been removed write to NRI Schools McGraw Hill Continuing Education Center 3939 Wisconsin Avenue Washington D C 20016 I we II N s sss 6261 mh h SOLVING THE ENERGY CRISIS It seems to me that the big challenge for electronics in the immediate future 15 ene
222. ery different one clean and clear the other harsh and metallic The difference you hear is Transient Intermodulation Distortion for short The real effects of TIM on music however have only recently been recognized since TIM does not show up in even the most accurate traditional laboratory measurements Measurements for THD are made with smooth repetitive signals sine waves Music on the other hand presents an amplifier with a series of non repeating pulsive transient signals as illus trated below SINE WAVES DYNAMIC MUSIC SIGNALS An amplifier that cannot faithfully follow the sharp transients demanded by music may have very low THD but very high TIM WHAT CAUSES TIM It has been discovered that TIM distortion in an amplifier is caused by an insufficient slew rate the engineer s term for an amplifier s ability to handle the high power high frequency signals a musical transient presents Poor slew rate in conventional amplifiers is most often caused by the very mech anism used to reduce THD namely the addition of negative feedback Put more simply in convention ally designed power amplifiers the more negative feedback you use the lower will be the THD which is good but the higher will be the TIM which is not so good It took Sansui and a whole new approach to amplifier design to solve the high frequency slew rate problems of TIM without compromising our superbly low THD specificat
223. es The probe wires should be good conductors and very thin to prevent inter nal heat losses The response time of a probe is usually specified as the time taken to reach 66 of the measured temperature typical figures would be 5 to 20 seconds A more useful figure is the time taken to reach 99 of the final temperature which for digital instruments should be fast and should be less than 10 seconds or better than 1 second for 66 To get this speed there must be low contact resistance between probe and object low probe tip heat capacitance mini mum tip volume low connection resistance between tip surface and the temperature element low capacitance of the tempera ture element and the insulation between tip and probe must be very good to avoid heat leakage In other words the require ments for good temperature reproduction and fast response are similar AN ACCURATE TEMPERATURE CHECK is necessary when servicing household appliances such as a clothes dryer Vec Vcc2 R8 OUTPUT S 14 4 gt 0 54V R6 R10 R5 R3 R11 FIG 3 TEMPERATURE PROBES can locate the area of a fault in a circuit but other measurements are then necessary to pinpoint the malfunction ing component An example of an instrument that meets these requirements is a digital multimeter from Philips the model PM 251 3 which includes a temperature measuring facility that checks tempera tures from 60 to 200 degr
224. etworks Nonetheless a comparison with other top quality units using IHF standards shows that the noise levels of the model CR 2040 are extremely low even when the higher gain moving coil phono inputs are used If you want to use an MC cartridge the savings that accrue from having a built in head amp are quite substantial The high phono overload capability of the preamplifier for both the MM and MC modes is particularly worth while if you plan to play some of the new direct to disc recordings that typically contain higher groove velocities i e modulation lev els than commercially mass produced discs Figures 8 and 9 show the flexible six control tone setup We have plotted only three possible turnover frequency settings for each control for the BASS and TREBLE controls in Fig 8 for the midrange in Fig 9 But a limitless number of intermediate settings could have been achieved for each of these controls TABLE 3 RADIO ELECTRONICS PRODUCT TEST REPORT Manufacturer Yamaha Model CR 2040 OVERALL PRODUCT ANALYSIS Retail price Price category Price performance ratio Styling and appearance Sound quality Mechanical performance 850 approximate High Excellent Superb Excellent Excellent Comments There is no technical reason why an all in one stereo receiver should not perform fully as well as separate components and there is no better proof of this than the measured and listened to results of the Y
225. f the scope tube the sinewave pattern Fig 17 available from Fidelity Sound may be fastened to the tube screen and the out put of the AF sweep generator is adjusted so that the period and amplitude corre spond to the peaks and zero crossings of the plotted sinewave This same signal is simultaneously fed to the input of the distortion analyzer The output of the distortion analyzer is applied to the second trace of the scope The first adjustments are made with a screwdriver in each hand Simulta neously adjust R510 and R513 to pro vide the best visual fit between the gener ator waveform and the plotted pattern Watching the output of the distortion analyzer as you make the adjustments will help you understand the interaction of these two controls The final adjust ments are made while watching the meter on the distortion analyzer However if there is a noticeable deviation between the generator output and the reference waveform it indicates that a further improvement is possible A simpler but less precise test is to use a single trace scope with a sinewave pattern superimposed on the screen A visual match between the plotted and generated waveforms will produce a sig nal having distortion components that are low enough to be insignificant in frequen cy response measurements Calibrating the manual frequency sweep involves both the timebase and r i R526 R534 503 R232 R524 audio sweep generator sections since
226. ge Make sure that when R4 is at its end points the beam is on an end vertical line Switch S12 to LINEAR Set R4 to O Adjust R11 for the desired center frequency Move R4 to its lowest position Set R10 through the front panel for the desired low frequency limit Move R4 to its upper position Check for the desired high frequen Cy limits Several readjustments of R10 and R11 may be necessary Adjust R9 to the extreme low fre quency end and then back off 3 turns Run R4 through its full travel FIG 17 SINE FUNCTION can be plotted on the CRT screen and used to adjust the sweep generator for minimum distortion R5 RI R2 R3 R4 R8 11 FIG 18 CALIBRATION WAVEFORMS Log function is shown in 8 triangular wave is shown in b and antilog function is shown in c Watch the beam as it moves horizon tally across the scope screen Stop at each vertical centimeter division and note the frequency perfect log sweep will have the frequencies indicated in Table 1 Adjust R401 and R403 for the best fit at the frequencies listed It is important to be able to occasional ly look at the waveform at the output of TABLE 1 0 1 2 3 4 5 6 7 8 9 0 1 501 as was done when the first approx imate adjustments of R401 and R403 were made This is because it is easy to grossly misadjust R401 and R403 and keeping an eye on the waveform at the RE B 921 522 67 756
227. generated that provides the grey background behind the picture numbers on the screen These video signals are applied to the second video amplifer and then to the VHF modulator The composite video signal is also applied to the rear panel monitor jack The VHF modulator Fig 8 receives the composite video signal and the audio signal These signals modulate the RF carrier in the RF modulator stage The RF modulator is an oscillator that delivers an RF signal on VHF TV channel 3 or 4 If the channel selector switch connects to ground channel 3 is generated If the switch connects to 12V channel 4 is generated A simplified diagram of the antenna switch box is shown in continued on page 89 646L b RADIO ELECTRONICS D DA D a Pre ision Digital Thermometer BILL OWEN THE PRECISION DIGITAL THERMOMETER described in this article uses large scale integrated circuitry and laser trimmed temperature transducers to achieve state of the art temperature sensing capabili tres The two switch selectable probes can be connected through hundreds of feet of cable to provide accurate temperature sensing in remote areas Celsius or Fahr enheit measurement is switch selectable with 0 1 resolution with an accuracy better than 0 5 C 1 2 F over a 50 to 150 C range 60 to 200 F Table shows the digital thermome ter specifications The digital thermometer can operate from a 117 volt t
228. h up R634 Adjust R635 for 100 meter deflec tion Well that wraps up the calibration procedure Next month we will conclude this series with some hints and applica tion notes on using the Audio Test Sys tem R E NEW TECHNICIAN The Board of Directors of the new Aec tronics Technicians Association ETA has appointed Dick Glass of Indianapolis as President of the not for profit professional association Dick Glass has been deeply involved in association activities in the con sumer electronics field in the past having served as Executive Vice President of NEA and NESDA President of NEA three times President of the Indianapolis Television Technicians Association director of the Certified Electronics Technician program Director of Training for the NEA U S Labor Dept Apprenticeship Training program in 1967 68 publisher of ServiceShop maga zine and an instructor in the PSM business management schools of NESDA Mr Glass resigned from his position with NESDA in 1977 and has since operated his Own service management consulting firm authored numerous trade publication arti cles and has taught electronics technology S a DICK GLASS ASSOCIATION at ITT Technical Institute Dick stated that is a national associ ation of electronics technicians Member ship is open to all of the technicians engaged in this profession Ron Crow former ISCET executive is a native of lowa and now
229. hanged and what new directions the field is taking You ll probably want to be a part of IL It s free Just mail the card or coupon Today ee ee ee NATIONAL TECHNICAL SCHOOLS Dept 206 079 4000 South Figueroa Street Los Angeles California 90037 Please send FREE Color Catalog and Sample Lesson C Color TV Servicing amp W TV and Radio Servicing License Course L Electronic Communications O Electronics Technology 0 Audio Electronics Servicing D Digital Electronics 0 MicroComputers MicroProcessors NO OBLIGATION NO SALESMAN WILL CALL APPROVED FOR VETERAN TRAINING Name Address ac NATIONAL SCHOOLS I 2555775 TECHNICAL TRADE TRAINING SINCE 1905 I State _ Zip Resident and Home Study Schools Check if interested in G I Bill information 4000 South Figueroa St Los Angeles Calif 90037 Check if interested ONLY in classroom train ng in Los Angeles G G 6461 RADIO ELECTRONICS 22 EQUIPMENT REPORTS continued from page 27 carriage return indicating I was through and the machine responded with the prompt aster isk on the following line At this point you re ready to check by read ing out memory contents with the M com mand Again you use O as the starting address however the 30 is not data but the number of words in hexadecimal format to be typed out
230. hannel separation readings of the tuner section According to Radio Electronics stereo performance measurements the channel separation at 100 Hz was a very high 60 dB superb while Hirsch Houck Labs obtained only something like 42 dB up to 500 Hz Furthermore their descrip tion of the channel separation vs frequen Cy makes me think that they have been testing a downright different receiver Also there is a difference am not saying error between their readings of the harmonic distortion of the amplifier sec tion At 1 watt and 1 kHz Radio Electron ics gives 0 03 while Hirsch Houck Labs offer only 0 0176 As someone who works in this field it is hard for me to believe that the results of these two tests represent both extremes of the performance tolerances of this particular Luxman receiver If this is so in spite of my disbelief there is no point in claiming channel separation or anything else with an accuracy of decibels some times even tenths of dB s The same applies to all measurements A more obvi ous reason why Hirsch Houck Labs re ceived lower separation readings is that the stereo decoder adjustments were not tuned to their optimum as they were in the unit tested by Radio Electronics You may have noted that in bringing up the issue of the discrepancies between test results published by the two magazines have based everything on the fact that both tests are completely valid Should a test report reve
231. he meter to connect it to test point 2 during calibra tion This would eliminate the need for a separate meter during calibration An 18K resistor plus the internal meter resistance would roughly allow the meter to read 2 volts full scale Using an addi tional meter you could determine where to place the calibration mark on the meter face After assembly is complete and all connections are carefully checked the unit can be calibrated Calibration and check out With the cover off apply power to the Cardiotach but don t plug in the sensor assembly Place switch S3 in the calibrate position LEDI should start flashing and the beep tone should be heard if it is turned on Connect a voltmeter to TP2 and adjust R16 to exactly 1 5 volts DC The filtering action of 1 4 will slow down the action of R16 Adjust the control a little at a time and wait for the meter to reach its final value before read justing the control Now adjust R24 so that the meter reads 90 BPM The Car diotach is now calibrated Set S3 back into the operate position and plug in the sensor assembly Attach the sensor to your index or middle finger placing it against the fin ger pad and wrap the self stick straps around your finger moderately tightly Your finger should not feel uncomfort able or cold due to excessive tightness nor should the sensor be loose enough to slip around Adjust the sensitivity control upward from the minimum until the LED
232. hing is finished and to wash out the etching trays Immediately after etching a board take the time to pour the etchant into a second plastic bottle Do not mix the used and unused etchant Clean and dry the etchant tray Secure the chemicals and lock them up if necessary What about the disposal of the final used up etchant If you have copper pipes in your home do not dump them into the plumbing system Store the used up etchant in an old plastic or glass container and check in your community for chemical disposal areas If you must dispose of the etchant in your plumb ing system be sure to dilute the etchant extremely well Several gallons of water to about a pint of etchant will dilute the etchant safely for disposal Also flush the pipe system with several gallons more of water It is completely safe to dispose of etchant in this manner the solution is extremely diluted and harmless to plumbing Other than these two safety precautions using stor ing and disposing of the chemical should offer no problems Etch resist lacquer paint and the lacquer remover solvent are the chemicals used to apply etch resist to copper boards Safety measures are the same as for any other type of solvent used around the house Make sure your work area has adequate ventilation when finished boards are cleaned And again store the solvent away where it is safe from small hands The chemicals used in photocopying your designs are a spray to sensitize the bo
233. iCd batteries or AC adapter charger Display 0 36 9 2mm Digits reading to 1999 Size 8 W x 6 5 D x 3 H 203 x 165 x 76 mm Weight 1 5 bs 0 68kg exci battery LED display with automatic decimal placement and large 9mm numerals Of course that s what you d expect from a quality DMM But we ve even added more features for extra convenience flexibility and reduction of human error 9 Unique X10 Multiplier Switch gives you convenient push button selection to the next higher decade range Hi Lo Power Ohms capability gives you three high ohms ranges that supply enough voltage to turn on a silicon junction for diode and transistor testing For in circuit resistance measurement without turning on a semiconductor junction you use the three low ohms ranges Wide Frenquency Response 40H to 40kHz bandwidth lets you measure audio through ultra sonic AC signals Touch and Hold Capability with optional probe retains readings for as long as you wish You can make measurements in hard m 0 w 13426 Floyd Circle M S 35 Dallas TX 75243 To Sabtronics International Inc Please send sabtro MOREL amoa places without taking your eyes off the probe tip or stopping to record data e Plus More Auto Polarity Auto Zero Overrange indication and fully overload protected on all ranges And although designed for bench
234. ibels and plenty more Order 48A 12 50 postpaid Handle complex math easier than you ever thought possible P S The above title is available also as a Order 28A 12 50 postpaid Forest Beit s SELF TRAINER KIT two audio cassettes Scientific Calculator Order 28SC 35 50 postpaid plus a dozen sets of Worksheets for a group Order 48K 79 50 postpaid Additional Worksheets Qrder 48W Ten for 25 50 eee em ew eee eee Enclosed in my 5 check or money order outside U S add 20 to all prices Please ship MONOGRAPH 28A Easi Way Solutions for Electronics Math and Formulas 0 12 50 each Scientific Calculator 28SC suits use with 28A 35 50 each MONOGRAPH 48A TRIGGERED OSCILLOSCOPES Four Hours to Famillarity 12 50 each SELF TRAINER KIT 48K TRIGGERED OSCILLOSCOPES Four Hours to Familiarity 79 50 each kit Additional Worksheets 48W for larger groups to use with KIT 25 50 for ten My_name 15 Address Phon City State gt Zip Code _ Forest Belt s Service Training 5 Box 68120 Indianapolis IN 46268 69 646 RADIO ELECTRONICS FREQUENCY COUNTERS COMPARE B amp K PRECISION TO H P B amp K PRECISION 1850 5Hz 520MHz 10Hz 520MHz manual 50mV NO 2 5 0 40 1Hz AC ONLY _ 650 Gate time auto Sensitivity
235. ic trigger from either channel including TV sync PnRIcE S635 10 mV sensitivity The 20 MHz Single Trace Resistance resolution to 0 0010 with 8012A Built in batteries and charger Option 01 Rugged enough for field or bench 69 i FREE OUR PRICE 299 SEND FOR OUR CATALOG Call TOLL FREE 8001526 2514 201 227 7720 Mastercharge Bankamericard and COD Accepted LIST PRICE 769 Triggered Oscilloscope Outstanding trigger sensitivity over entire operational range 10 mV sensitivity and 17 4 nSec rise time ELECTRONICS AMPOWER INST INC TEST LEADS WITH EVERY ORDER add 3 00 to cover shipping handling insurance 6 X5 magnification 5 dellvers 100 nS cm 26 JUST ROAD FAIRFIELD N J 07006 N J res add amp maximum speed for easy precise readings CALL 59 d 455 THE MEASUREMENT SPECIALISTS LIST PRICE 549 OUR PRICE WE SE RVICE WHAT WE SELL 108 CIRCLE 66 ON FREE INFORMATION CARD P O Box 4430E Santa Clara 95054 For will call oniy 408 988 1640 Same day shipment First line parts only 2322 Walsh Ave Factory tested Guaranteed money back Quality iC s and other components at fac tory prices INTEGRATED CIRCUITS 7400IILC ps y ue sm ELECTRONICS 402N dg p oe 4 LM38 1 6
236. ice The written description is also a lot easier than a full length article a maximum of four and a minimum of two typewritten pages double spaced The first paragraph should describe your New Idea Next explain why it 1s innovative The rest of the text should be a detailed explanation that includes any necessary information your fellow readers will need to be able to actually use it Keep the words simple Submitting the idea is a matter of snipping out the coupon filling it out signing it and mailing it with your idea to us The coupon contains some legal copyright jargon which gives us your permission to publish it If we don t publish it we ll return all of the material to you If we do publish your New Idea you ll see your name in print and we ll send you a check for 25 So now what s your excuse We know you have the ideas Get up off your er laurels and write them up gt 27 a ART KLEIMAN Managing Editor S a a W siwa E E gt Radio Electronics Hugo Gernsback 1884 1967 founder M Harvey Gernsback editor in chief and publisher Larry Steckler KTX 3644 CET editor Arthur Kleiman KTZ 3288 managing editor Robert F Scott CET W2PWG KXK 8533 technical editor Sonia Greenbaum copy editor Jack Darr CET service editor Leonard Feldman contributing high fidelity editor Karl Savon semiconductor editor Herb Freidman communications editor David Lachenbruch c
237. ick up Transmits up to 350 ft With an LED indicator to Signal the unit is on zeumz KIT FORM 7 95 PLASTIC PROJECT BOX COMPLETED UNIT NOT A KIT OCL pre amp amp power stereo amp with bass middle treble 3 way tone control Fully assembled and tested ready to work Total harmonic distortion less than 0 5 at full power Output maximum is 60 watts per channel at 842 Power supply is 24 36V AC or DC Complete unit Assembied 49 50 ea S 8 50 ea 22W 22W STEREO HYBRID AMPLIFIER KIT It Works in 12V D C As Well Kit includes 1 PC SANYO STK AA Power transformer AAAAAAAAAAAAAA o 024 stereo power amp IC LM 1458 as pre amp all other gt a ene Deak tronic parts PC Board all contro pots and special heat sink copper ciad PC board cover it allows for hybrid Power transformer not included IL produces Yoo to circUni made qh ultra hi fi output up to 44 watts 22 watts per channel yet i pula gives out less than 0 1 total harmonic distortion between 2 7 8 X2 1 4 x1 3 8 0 80 EACH 100Mz and 10KHz 32 50 PER KIT E aie m 1 25 EACH POWER TRANSFORMER 6 50 EACH C lt CIRCLE 12 FREE INFORMATION CARD gt AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA A A A A
238. ide either an audible or silent alarm The silent alarm controlled by a timer which delays the alarm up to 30 seconds The silent alarm activates a relay whose contacts are brought out to plug and will activate ANY device auch as siren horn tape recorder telephone dialer etc Description motion detector kit less batteries j 1072R Motion Detector Chip eniy with data D 5611R P C boards set of 2 52888 AA NiCad Batteries set of 4 56368 Battery charger for above 56358 Completely assembled kit w batteries amp ISTOR WAVETEK 4 hip which combines the latest in EDUCATION amp INSTRUCTION TELEPHONE bugged Don t be Watergated Countermeasures brochure 1 00 NEGEYE LA BORATORIES Box 547 RE Pennsboro WV 26415 UNIVERSITY degrees by Bachelors Mas ters Ph D s Free revealing details COUN SELING Box 317 RE6 Tustin CA 92680 UNDERSTAND digital electronics Programmed learning courses Design of Digital Systems 6 volumes only 19 95 Digital Computer Logic 4 volumes 14 95 Both 29 95 Free detaiis GFN INDUSTRIES Bidg 7 20 203 Loudon Road Concord NH 03301 ASTONISH your friends with magic ESE card tricks you can do Details LANGEN Box 191 CA Downsview ONT Motion amp FIRE e device 18 completely self Sale E 56 ANTENUATORS 225 DEL 50100 2 Rotary Attenuator Attenuation
239. ideo circuits The 8 MHz video FM signal from the high frequency processor module is applied to the 8 MHz video FM amplifier through pin 3 on the dropout detector as shown in Fig 5 The trap removes any 2 3 MHz sound carrier still present at this point The amplifier delivers two outputs one at pin 15 and one at pin 17 The output at pin 17 is passed through a 64 ys delay line It delays the signal by one horizontal scan line The undelayed video FM is applied to the dropout detector The output of this stage is a voltage at pin 7 As long as the dropout detector senses the 8 MHz signal it maintains an output of about 1 VDC at pin 7 If the high frequency signal should drop out momentarily caused by a videodisc defect 42V l punctum eric mecha DROPOUT DETECTOR I I 703798 VIDEO VIDEO FM 4 8 MHZ ISI EM HI Q PROCESSOR AMP DELAYED VIDEO FM DROPOUT ADJUST 5 13 R3024 7 Won ok TH 6866 5V DROPOUT FIG 5 DROPOUT DETECTION CIRCUIT spots signal dropouts and auto matically fills those gaps the output at pin 7 goes high to about 5 VDC The DROPOUT ADJUST potentiometer R 3024 sets the actual amount of time the high frequency must be absent before the dropout detector responds The output at pin 7 is the high frequency identifica tion voltage It will b used later in other circuits The video FM and the delayed video FM signals are both applied to a
240. ient light level DC 11 clock with mtg bracket 27 95 DM 1 dimmer adapter PS Se Sa eee ee PRESCALER 30 Watt 2 mtr PWR AMP Hard to find PARTS Simple Class C power amp features 8 times power 1 Win for 8 out 2 in for 15 out 4 W in for 30 out LINEAR 1Cs REGULATORS Max output of 35 incredible value complete with 301 35 78MG all parts less case and T R relay aan 380 8 75 7805 555 45 78 05 556 85 7905 566 1 15 7812 34 95 Extend the range of your counter to 600 Works with any counter Includes 2 transistor pre amp to give super sens typically 20 mv at 150 mHz Specify 10 100 ratio 2 PS 1B 600 prescaler 59 95 1 30 W pwr amp kit PS 1BK 600 mHz prescaler kit 49 95 TR 1 RF sensed T R relay kit 6 95 1458 50 7815 FM WIRELESS MIKE KIT Transmits up to 300 to any FM broadcast radio uses any type of mike Runs on 3 to 9V Type FM 2 has added sen mike preamp stage FM 1 2 95 FM 2 kit 4 95 SEE eS rs COLOR ORGAN MUSIC LIGHTS See music come alive 3 different lights flicker with music One light tor lows one for the mid range and one for the highs Each channel individually adjustable and drives up to 300W Great tor parties band music nite clubs and more Complete kit ML 1 LED BLINKY KIT great attention getter which aiter nately flashes 2 jumbo LEDs Use name badges buttons warning p
241. inal phase the integrator AD590K Vout 4 917V AT 32 F 10MV 1 R RANKINE 18K SCALING RESISTOR FIG 1 TEMPERATURE DERIVED CURRENT flows through scaling resistors to develop voltages proportional to Rankine and Kelvin temperatures TO VOLTMETER 10MV C OR OR F 106 SENSOR AD590K R18 1K R19 7 86 SCALING RESISTORS R20 1K R21 9 53K FIG 3 REFERENCE VOLTAGES derived from a 6 9 volt precision source are used to produce temperature dependent voltages corresponding to Centigrade and Fahrenheit scales amp 626 Aine L RADIO ELECTRONICS output voltage is decreased at a rate that is proportional to the reference voltage stored on reference capacitor C12 The number of clock pulses required for the integrator to reach 0 volt is counted and displayed If the unknown voltage is inte grated for 1000 counts and if it requires 1000 counts during the final phase to reach 0 using a l volt reference then 1000 is displayed corresponding to 1 000 volt Resistor R22 and capacitor C13 are connected to the internal oscillator to generate a frequency of 48 kHz which is divided by 4 before being used Maxi C3 01 E 6 NICAD CELLS _ gt SUPPLY D UNITS C UNITS B UNITS A UNITS F UNITS G UNITS E UNITS D TENS C TENS B TENS A TENS F TENS AB 1000 20150 LARITY MINUS 9VOC OR 12VAC AT 300mA VIA
242. individual program steps can be dissected down to 2 machine or 3 machine cycles per instruction A series of 29 LED s display the status of the 16 bit memory address bus the 8 bit data bus the SO and 51 processor state codes the CLEAR and WAIT control signals and the processor s Q flip flop Bidirectional communications to a data ter minal are provided by interface circuits that use the Q flip flop for output and the EF4 flag to input the serial data Detailed instructions show how to hook up to current loop terminals such as Teletypes and to EIA RS232C inter faces such as Texas Instruments Silent 700 terminal Parallel 8 bit input and output ports are included in the kit External power supplies are required of 5 digit then added an extra line feed to make MO 112233445566778899AABBCCDDEEFF the printout more legible On the second line 100020 123456789ABCDE started to type 10 but decided I really wanted TN to enter more data starting at address 20 The system being forgiving only pays attention to 000F AFBECD the last four numbers entered so I typed 0020 MO 30 or could have typed 020 since one 0 was 0000 1122 3344 5566 7788 99AA BBCC DDEE FFAF already there from the 10 1 then hit the space 0010 BECD 0000 0000 0000 0000 0000 0000 0000 bar and typed in the data 0020 1234 5678 9ABC DE10 2938 4756 0000 0000 This time hit a comma at the end of the 2M20 10 line that told the machine 1
243. ined and tight bass reproduction For optimum overall sound reproduction this design approach requires a fairly heavy duty power supply This design approach is incorporated in Sansui s mod el AU 707 model AU 607 model AU 717 and model AU 515 amplifiers as well as Technics by Panasonic models SU 8080 and SU 8075 Figure 4 b shows another approach that involves a DC power amplifier plus a preamplifier equalizer in which the input capacitor has also been eliminated This method permits extremely low level low frequency signals to be applied directly from the phono cartridge into the first a o M I I m I I I I I I I I I EQUALIZATION ecu POWER SEES epee I BYPASSED DURING 0I5C preamplifier stage without passing through a coupling capacitor Since a cartridge can be considered to be a volt age generator the preamplifier equalizer usually uses an FET because of its volt age amplifying capability Using an FET as a first stage has the advantage of not requiring any bias voltage Although there is a difference in the signal to noise ratio between an FET and a conventional bipolar transistor phono input circuit when it is measured under short circuit input conditions the FET circuit pro vides an excellent signal to noise ratio during actual o
244. ing different DC amplifier designs however using a simple square wave input signal may not show such obvious output differences at all Accord ingly more complex input waveforms more easily show up these minor differ ences For example imagine that a 400 Hz tone burst were superimposed upon a 20 Hz sinewave When using such a waveform to compare two DC amplifier designs such as those shown in Fig 4 b and Fig 4 f such differences are easily found See Figs 6 and 7 The scope photo of Fig 6 shows that when the Fig 4 f design is used the 400 Hz burst appears at the same relative position in the output waveform with respect to the 20 Hz low frequency com ponent in the composite signal Using another amplifier which is designed ac cording to the scheme shown in Fig 4 b and using the same input waveform shown by the upper trace in both Figs 6 and 7 the scope photo of Fig 7 shows that the 20 Hz component in the output lower trace has been displaced in time with respect to the 400 Hz tone burst Many audio theorists suggest that such subtle differences in time phase relation ships are detectable by the human ear even though all frequencies are ultimately reproduced at their correct relative am plitudes Others argue just as vehemently that such phase differences are undetect able by the human ear Nevertheless early reactions to the new breed of DC amplifiers seem to indicate that they do sound audibly better d
245. ions THE SANSUI SOLUTION The most important step in the solution was to speed up increase the frequency response Of the basic amplifier even before negative feedback is applied by using Sansui s own patent pending DD DC Diamond Differential Direct Couplea LOW TIM MAKES THE LISTENING DIFFERENT AU 919 DD DC AMPLIFIER circuit The DD DC circuitry includes a sophisti cated lag lag lead dual compensation sys tem more often found in instrumentation amplifiers than hi fi products which maintains stability without decreasing frequency response With DD DC the amplifier can instantly supply the enormous negative feedback current demanded by transients without restricting the slew rate so without introducing TIM How well our unique Circuitry Suc fo i ceeds in eliminating TIM while maintaining extraordinarily low levels of THD is shown in these comparative curves The Sansui AU 919 amplifier bottom Curve is rat ed at 110 watts per channel min RMS both channels into 8 ohms from 10Hz to 20 000Hz with no more than 0 008 total harmonic distortion Power output vs TIM distortion curves for the Sansui AU 919 and competitive amplifiers Derived using the TIM mea surement method described in a paper presented at the 63rd Convention of the AES May 1979 available from Sansui on request LET YOUR EARS BE THE JUDGE Instruments and circuit design anal
246. irmly to the board it is useless Radio Shack has a resist type of pen that can apply a fine line to the copper PC board In a pinch you can use a black pen to make the resist line to the board but I find these lines tend to undercut Of all three methods for direct transfer to a PC board recommend using the brush and resist method The brush and resist method allows you to apply very fine lines to the PC boards If a line is too thick you can easily thin it down by cutting the dried lacquer paint with an Xacto knife blade Lines as thin as hold up well in the etchant and undercutting of these lines has been minimal for me The whole point of the PC board method you choose is that the lines on the copper board must resist the etchant and not be undercut or etched away during the time that the board is exposed to the ferric chloride etchant If the etch resist is not holding up to the etching of the board and the foil is being etched away under the resist material you must develop another method or perfect the one you have chosen to work with From the drawing stage to the laying in of the PC board resist material to the finished board you should encounter no major problems once you have practiced your skills And as soon as you have mastered these skills you should be able to make circuits of any size or complexity By starting small making small circuit boards and adding to your skills you can master the methods you have chosen I
247. itance Meter 333_______ lt price 130 5109 MODEL 820 m PRECISION MAST ERCHARGE VISA TOLL FREE HOT LINE 800 223 0474 54 West 45 Street New York 10036 212 687 2224 I 8 Measures Capacitence from 0 1pF to 1 Farad Reeocives io 0 1pF 10 ranges lor etcurecy end resolution 4 digit eay lo ree d LEO displey 0 5 accuracy Speciel lead Insertion or banana Fuse protected Uses either rechargeebis or disposable barteries Overrange indication 169 E 149 95 REG 180 LTC 906 Transistor Checker in or out of circuit Automatically identifies Germanium or Silicon Automaticalty identifies emitter base and collector LED display plus audible tone indication e Automatically checks transistors FET s diodes good bad Covers 0 02Hz 2MHz 1000 7 tuning renge Low distortion high eccurecy outputs Three elep attenuetor plus vernier control Interne lineer end log eweepe E Tone burelt output Is front penel or extemelly progremmeble Absolute meter readout of Hfe Bve and Leakage current THE TEST EQUIPMENT SPECIALISTS ADVANCE 6261 j RADIO ELECTRONICS INTERNATIONAL FM 2400CH Portable Solid State Rechargaabis Batteries The FM 2400CH provides an accurate frequency standard for testing and adjustment of mobile transmitters and re
248. ith pushbutton ease Now Tune in all the real excitement of the wild blue yonder at the touch of a button The new no crystal Bearcat 220 Scanner searches and tunes in the entire air craft band Jets at 30 000 feet All the tense tower talk Everything is pre programmed in space age memory banks Only the 7 band Bearcat 220 Scanner also brings home every public service frequency too Pre programmed Marine frequencies Police ac tion Fire calls Weather warnings You name it The new Bearcat 220 has all the features and quality Bearcat Scanners are famous for Track tuning Decimal display readout Automatic Search Selective Scan Display Automatic squeich and lockout Priority And much much more BEARCAT After all Bearcat invented Scanning And we ll 220 SCANNER stop at nothing to bring you all the excitement of land sea and air Follow the leader to real excitement Copyright 1979 Electra Company Division of Masco Corp of Indiana 300 East County Line Raad Cumberland Inciana 46229 CIRCLE 54 ON FREE INFORMATION CARD 6461 AINE RADIO ELECTRONICS LETTERS continued front page 12 tube the mirror image of the first Here s the procedure Place a particle of matter at each end of the tube suck out all the air and cool everything down with liquid nitrogen helium or some other coolant Switch the power on and off for each of the inductance
249. iting and relevant The equipment you receive with NTS training programs is selected to provide you with a solid the first name background in electronic systems Kits and lessons are designed to work together to demonstrate electronic principles and applications The kit building not only shows you how electronic hardware functions but how various circuit designs accomplish different purposes Your lessons guide you through any number of experiments associated with many projects This is the Project Method and it works Step by step you learn how and why digital electronics has become a part of our world and the even bigger role it is sure to play in the future Whether you are looking for training in Consumer Commercial or Industrial electronics NTS offers fourteen courses some basic many advanced in several areas of electronics An all new full color NTS catalog shows you what each course covers electronics of the future systems and more from in home study _ 12918 2 52 AL 40109 g s FH EIL AT LiL LLL TT FEELER 3 III IL a 111 1LLL E 11 11212 fine LLL U ce every piece of equipment included Send for it today and see for yourself what s really happening in electronics training technology at NTS Find out how much has c
250. k well For fine layout work use vellum papers A supply of clear plastic film is handy for overlays On these clear films the permanent type marker pens work well but I find the lines a little thick Use various colors red black green for overlay work POSITIVE PHOTORESIST etched circuit kit Vector Electronics 32XA 1 includes photo sensitized copper clad boards artwork patterns and all other materials needed to make seven PC boards For those who want to specialize in photocopy work Mylar film is the best quality albeit expensive film to work with Once the layout is placed on Mylar film photocopies are easily obtained To date I have used clear film but I understand that the opaque film is invisible to a black ultraviolet light for copy work Films with grid lines with a 0 1 inch spacing are avail able but costs are high Graph paper can be used for the initial layout use 10 lines to the inch and you will have a perfect layout for all the IC components for your board Transferring this layout to a film overlay if a two sided board is contemplated gives you a permanent basic drawing with an overlay film for the top and bottom sides to check against your PC board lines suggest that you visit a good art and drafting supply store and ask if they have inexpensive starter sets If you do not have drafting experience consider a do it yourself book on the subject Try your hand at your own drawings These drawing skills co
251. l be as many as eight capacitors in the signal path as shown in Fig 3 The large capacitance electrolytics used previously in output stages are the most likely to degrade sound quality since they can behave as nonlinear impedances even when properly polarized Such capacitors are likely to affect the coupling between speakers and cartridges and the amplifier It is no wonder then that they were the first to be eliminated in modern amplifiers In theory it is possible to design an amplifier having no capacitors at all However in practice this may be difficult and in some cases undesirable If a very small amount of direct current is pro duced by a signal source for instance a tuner having a slightly leaky output ca pacitor or a tape deck having the same problem this current will be amplified by the gain factor of the entire integrated amplifier often by 30 dB or more and appears as a DC voltage at the speakers which could easily destroy an expensive loudspeaker system For this reason a few coupling capacitors remain necessary in integrated amplifier design Different companies have approached the DC amplifier design problem in dif ferent ways Figure 4 shows some of these approaches In Fig 4 a only the power amplifier uses a pure capacitor less DC design Using such a DC design in the power amplifier has the advantage of providing excellent damping factors at low frequencies which in turn provides well def
252. l logic for the picture number is removed from the composite video signal by the clipper decoder circuit Here the logic is decoded and converted to the picture number video signal This signal is also amplified by the video amplifier and applied to the VHF modulator The VHF modulator takes both the audio and video and impresses them onto the required channel 3 or channel 4 RF frequencies The resulting RF signal is connected to the antenna terminals of the TV set through an antenna switch box The video circuitry creates a DC voltage that is proportional P N CLIPPER DECODER ASSEMBLY DELAYED Eu VIDEO DEMOO DO VARIABLE EMPHASIS 8 MHZ SwITCH DROP OUT DETECTOR FIG 2 SIGNAL PROCESSING Simple block diagram shows all of the circuit elements involved 6 6L RADIO ELECTRONICS D to burst amplitude This voltage is called emphasis control because it is applied to the high frequency amplifier to empha size the high frequencies when playing the tracks that are near the inner diameter of the videodisc The high frequency empha sis effect decreases as the program progresses toward the outer diameter This control is required because the pits are more closely spaced at the inner diameter and therefore result in reduced high frequency response This circuit compensates for that reduced response The 8 MHz FM signal is applied to a dropout detector circuit When a
253. le sacrificing stereo FM separa tion The AFC circuitry OTS is defeated when the tuning knob is touched during tuning but it locks the local oscillator frequency once the desired signal is tuned in and the knob is released When the OTS is activated this also activates the muting circuit to eliminate interstation noise when tuning The stereo decoder contains a phase locked loop demodulator plus a tracking pilot signal canceller that removes residual 19 kHz signal before it reaches the demodulator This special circuit even takes into consideration any minor variations in the 19 kHz level that are trans mitted by the station pilot signals may legally range from 8 to 10 of total modulation thus tracking both the level and the phase of the incoming pilot signal This canceller circuit makes it possible to achieve excellent high frequency response in stereo FM since brute force filtering of the 19 kHz signal which often degrades response in the 10 kHz to 15 kHz range is not required after decoding The elaborate tone controls use low noise IC s with gyrator or simulated L C circuits that are immune to hum pickup The phono section uses five low noise transistors per channel and the equalization feedback resis tors have a 1 tolerance while the equivalent TABLE 2 RADIO ELECTRONICS PRODUCT TEST REPORT Manufacturer Yamaha Model CR 2040 AMPLIFIER PERFORMANCE MEASUREMENTS R E R E POWER OUTPUT CAPABI
254. lem monitor editor IN GIANT BOARO wiih cassene 1 0 RS 237 0 Hol 1 0 decoders tor 14 separate 1 0 39 95 plus 57 Kluge Prototype Board accepts up 10 46 IC 5 17 00 mus 1 4k Stabc VII Addressanle to any 4k page 10 89 95 pius 3 Goin plated 86 pin Connectors one required tor each m boardi 5 70 Expansion Power Supply required when adding 4k RAM 34 95 pius 2 Professional ASCH Keyboard kil with 128 ASCH upper iower case sel 96 printable characters onboard reQulator parily logic selection and Choice of 4 hand shaking sumals to mate with almost any computer 64 95 nlus Deluxe metal cabinet tor 5 Keyboard 19 95 piu 52 50 na Videa Oisplay Board kit 1615 you generate a Sharp professional 32 0 h character by 16 ine upper and Case display on your IV Screen or video monitor draniahcally improving your unexpanded 99 95 ELF tI ibis inside ASCH Keyboard cabinet 89 95 ius 2 p amp n ELF II Tiny BASIC cassete tape Com mands include SAVE 10AD x j 26 vanables AZ LET IF THEN PRINT GO TO GO SUB RETURN END REM CLEAR LIST RUN PLOT PEEK POKE Comes fully documented and in cludes alphanumeric generator required to display alphanumeric characlers directly On your IV screen wilh oul additional hardware Also plays laCk toe plus drawing game that uses ELF H s hex keyboard
255. les The device could be toroidal but a linear setup would be more practical since it would not involve changing the direction of the particles we wish to impact In other words build junior sized atom smasher IL would be shaped as a tube several miles long so that it can achieve the veloci ties required for the densities being used It will be airtight because you want to evacu ate the atmosphere from inside it so that the rapidly moving particle will not encoun ter friction from the gas molecules and incinerate itself Induction coils will be spaced out along the length of the tube their magnetic fields will move the matter around Also used will be sensing coils and some deflection coils their function will be described later on To derive the flux densities required to do the job some heavy currents will have to flow through the induction coils To do this without generating excessive heat the coil resistance must be negligible The tube must be encased in a jacket inside which a supercoolant can be injected At the terminal end of the accelerator will be a structure containing a black bodied oven the walls of which contain pipes through which water or some other heat exchanging liquid can pass to extract the heat of the impact and remove it so it can be converted to electricity Beyond the oven structure is a second accelerator continued on page 14 RADIO ELECTRONICS N Another reason to join RCA s Q
256. licon Power Rectitiers gt gt ux sid lt I LM 553 2116 STAY RAM 8 125A 240A o E E ue lt wn 556 a a 7432 22 74196 0 ee oe 30 3130 4125 200 2 X nm d a 438 74279 y 565 CRYSTALS 3 45 ea RIBBON CABLE 650 950 7440 72135 74298 Lise S MU 566 2 000 MH LAT COLOR CODED r 341 7414B 74368 74L575 LL 7415257 567 30 WIRE 12 50 1442 74150 14399 125 576 141 5258 203 26 cond 50 per toot 1050 16 50 7445 n151 75322 74 586 i 1405259 733H 40 cond 75 foot 12 50 20 00 75153 74325 1 50 741590 lt 74L5265 709 50 90 foot z 14 592 741 5266 oer MPSAD 1024 NEDTCON 1024 analog Bucker PATA CASSETTES 1 2 HR 95 6 c CV Brigade shift register 14 95 74L51095 14 5290 747 15751 00 VP OUEST 35 00 aie h MMC LM 1310 CTS 206 8 eight position dip switch 1 1 ut 25V ceramic caps 16 1 00 5 00 100 MM5387AA 5 95 74L5114 74 5388 1456 CTS 206 4 four position dip switch 5145 85232 DB 25P male 2 95 M7001 7 50 rat S308 o LIGHT ACTIVATED SCR s to 18 200 V 70 CONNECTORS DB 255 female 5250 MM5 369 3 75 7415126 7415286 4L5390 SILICON SOLAR CELLS HOODS 1 50 74 5670 24 diameter 4V at 500 ma 4 00 30 WIRE WRAP WIRE SINGLE gt 4 diameter AV at 10 0 REGULATORS STRAND 100 1 40 FND 359 4 5 60 LED READOUTS 323K 5V
257. lient adjust able sensitivity Recorder activated by voices other sounds Uses recorder mike or remote mike Great for home business etc 2 1 4 x 3 4 x 1 2 24 95 AMAZING ELECTRONIC MICRO MINI MIKE Among worid s smallest solid state self contained WIRELESS MIKE Mercury Bat furn Picks up most sounds and transmits without wires up to 300 ft thru FM Radio Tuneable Use as mike ampf atarm amp alert System baby sitter hot line etc Plus 1 00 Pstg amp Hdig Money back guarantee California residents add tax Free data Mail order Visa M C Cod s o h Quantity discount available AMC Sales Dept 19 9335 Lubec 518 95 2 St Box 928 Downey Calif 90241 Phone 213 869 8519 HIGHLY PROFITABLE ONE MAN ELECTRONIC FACTORY Investment unnecessary knowledge not re quired sales handled by professionals Ideal home business Write today for facts Postcard will do Barta RE S Box 248 Wainut Creek CA 94597 INVENTORS FREE information on offering your invention for sale KESSLER SALES CORPORATION C 316 Fremont OH 43420 BUSINESS OPPORTUNITIES MECHANICALLY inclined individuals desiring ownership of Small Electronics Manufacturing Business without investment Write BUSI NESSES 92 R Brighton 11th Brooklyn NY 11235 RADIO ELECTRONICS 1 2 4 5 GET 50 CHANNELS MEE TEES UNE NC s EL uU it s true NO matter where you live i
258. lining up programming for the capacitance and optical systems respectively and Matsu shita would appear to be well behind in this activity Matshushita would be a formidable ally for either propo nent and both the Philips MCA and RCA camps are trying to determine whether it really will seriously pursue a third system or whether Matshushita is using Visc O Pac to improve its bargaining position or is trying to delay the videodisc market to avoid cutting into the videocassette boom Eight shows one channel Borrowing liberally from other people s inventions RCA Americom which operates Satcom satellites is proposing a new transmission system to the Armed Forces Radio amp Television Service that will make possible simultaneous reception of TV shows AFRTS which operates about 150 TV stations at U S mili tary bases on foreign soil currently does most of its programming by videocassettes shipped from the U S RCA proposes to supply two TV channels five full 15 kHz audio channels and an on screen teletext channel carrying them all on a single satellite channel They would be beamed directly via Satcom to U S bases in the Western Hemisphere and relayed to Intelsat to serve U S troops elsewhere The two channels in one are derived from an invention by CBS and Thomson CSF called STRAP or Vidiplex which interweaves two separate TV pictures using alternate fields of each picture The missing fields are reconstructed at the receiving e
259. lliam J Utterbach Cupertino CA sent me a Thordarson flyer in which the A 29056 A Ambassador flyback is listed as a FLY 265 Thordarson Thanks very much am always happy to be corrected in cases like this LOW DC VOLTAGES The DC voltages in this Magnavox model T991 are all very low except for the 150 volt source Is this a scan derived DC power supply There s no picture and no sound 4J R Detroit MI The DC power supply on this set does use scan derived voltages From the read ings you re getting it seems that the hori continued on page 84 What the workbook text teaches you Fundamentals of Microcomputer Hardware and Architecture 8 Fundamentals of Microcomputer Software How to Load and Execute Programs Program Flow and Program Loops 8 Program Specification and Design 8 Program Modules and Subroutines m Logic and Bit Manipulation 1 O Programming parallel serial How to Use Programmable O Device Interrupt Handling vectored priority Organizing Data in PROM and RAM Memory Advanced Math Routines m Advanced O Block Data and DMA Use What the Training Microcomputer Includes 1 Microcomputer and Power Supply 2 8080A Microprocessor and Control Logic 3 Eraseable PROM Memory Containing the Educational Monitor Program 1024 Bytes Expandable On Board to 8K Bytes 4 2048 Bytes of RAM Memory Expandable to 4K Bytes 5 Programmable I O Including Three 8 Bit Ports 6
260. lt age that is proportional to the heart rate This voltage can be measured at R20 which is an end mounted resistor used as a test point during calibration Integrated circuit 4 b is a voltage to current con verter used to drive meter MI Input resistors R21 and R22 filter and scale the meter drive circuit to produce a 60 uA current for a 1 volt input Since the meter is in the feedback path of IC4 b its inter nal resistance and any thermal resistance changes will have no effect upon the Resistors watt 10 unless otherwise specilied Resistors R1 470 ohms watt R2 R4 R14 R23 R28 10 000 ohms R3 RH7 R 12 R 15 R18 H 19 R36 R38 100 000 ohms R5 R6 R11 1 magohm RB R26 R27 R29 R35 1000 ohms 100 000 ohm linear pot sensitivity control R10 R20 10 ohms watt test points 1 amp 2 R13 27 000 ohms 816 124 10 000 ohm trimmer R17 2200 ohms R21 8100 ohms 1 R22 7500 ohms 1 25 47 000 ohms R30 390 ohms R31 180 ohms Fr32 5000 ohm audio taper pot with switch R33 120 ohms s watt R34 380 ohms walt current through it Diode D prevents reverse meter current and since it also is in the feedback path it has no other effect on the meter Resistor R24 is used to cancel offset voltages and to position the meter needle during calibration Re sistors R21 and R22 are selected for a series resistance of 16 660 ohms result ing in a 60
261. lus other Investigative materials QUIMTRONIX Postpaid P O Box 548 RE Seattle Washington 98111 CIRCLE 15 ON FREE INFORMATION CARD ONE CENTERS 1 r 1 _ _ __ __ __ _________ _ MORE GETS YOU TWO U U _ _ _ 8 6 OPTO COUPLER 1500V isolation hobby material u test 2629A 12 1 30 6 2M915 UHF TO 18 TRANSISTORS 1423 ccs n 1 29 12 for 1 30 ONE PENNY MORE 8 75 MOLEX SOCKETS Type M1938 4 nos 1a 40 129 ue E 8 6 CALCULAT OR AC ADAPTOR IACK standard threads 3 terminals z2316 3 or 1 50 TUBE SOCKETS 4 5 6 7 pin tubes asst 3839 2 129 100 for 1 30 GETS YOU TWO SKINNY TRIMS 40 CTS RESISTOR NET WORK asst styles and values singles and dips 45699 1 29 80 for 1 30 4 LECTROS POTENTIOMETERS 10 BULLETT RECTIFIERS 1 5 amp 200V anial 84 00 6 1 29 20 for 1 30 MINI 8 6 READOUTS MAN 3 common cath LED the claw RED 3338 1 29 12 for 1 30 Plastic SINGLE 3 8 square Single 8 LEDS asst sizes and shapes red green vellow amber 3869 1 29 16 for 4 TURN FLAT See Ih 8 P
262. m 1 bright horizontal line in the raster about one third of the way down from the top of the screen This results from several scanning lines being piled on top of each other there is a blank space above and below the bright line On set No 1 my friend tried replacing the vertical IC 1C302 This fixed it Back in the shop he found another set set No 2 with the same problem He tried putting in the IC he had taken out of set No 1 and it worked On set No 3 the next day because he was getting suspicious he simply pulled 1C302 out of the socket and pushed it back This cleared up the problem Further investigation on set No 3 showed that moving the convergence plug socket would cause the symptom to appear and disappear as would pushing on the PC board When he took the chas sis out he saw quite a few suspicious looking solder joints Repairing all these joints cleared up the problem Back at the shop again the set No 2 chassis was pulled to reveal the same problem JACK DARR SERVICE EDITOR There seemed to be enough solder on the joints In some cases the component leads hadn t been pushed far enough through the board to make a good joint A voluntary callback to set 1 revealed the same problem which was redone According to my friend Leon the worst offenders are the four long rectan gular ground lances going through the PC board on the right hand side from the top The foil used on thes
263. me naturally Even the cavemen learned to draw so can you It s just a matter of doing it and good materials can only help Drafting aids Many manufacturers offer electronic drafting aids from templates of symbols to IC pad layouts these come in X1 X2 and X4 sizes For your hobby work the size can be used Direct drawings of a X4 size are for military specifications but require photoreduction to a size this is too costly for hobby work Direct dry transfers from letters numbers electronic symbols IC pads etc are also available Bishop Graphics is a major supplier of drawing and drafting aids The Digi Key Corporation catalog shows that there are over 16 000 different Bishop Drafting supplies The 14 lead and 16 lead IC pads are a handy item but they tend to be expensive if a lot of IC pads are needed in the layout drawing The 0 10 lines of a draftsman ruler provide the centers of the IC leads and you can draw the IC pads directly A XI template does provide the pad for copying directly to the drawing but a fine lead pencil must be used to draw the lines As for the supplies needed for the actual PC board itself a good etch resist lacquer is important The Radio Shack resist lacquer is good but you may have to thin it out with some solvent Use a fine artist s brush the 00000 size for very fine lines and a 000 brush for general PC lines When these brushes are used with the lacquer resist they will wear out
264. mp and power duse 24 14 pin DIP capacity tractive Twa quality case Al metal construction 395 L x64 W x ZN H 5105 the features ot the PB 203 plui Adicional power supply flexibility provides 1 Regulatad SVOC suppiy same specitications as PA 203 Reg ulated preme 15VOC and 5 VDC 05 waples each with internally and independently adjust adie output voltage Ripple and noise of and 15V ICL 0 25 Pressure switches for hours minutes amp hold functlons Includes al components case and walt transformer z Fu ap MP adi Size 3 x lY x ly D WOIKS WI r 7 203 575 00 203A 5124 95 501 20 IRS 80 Challenger 2730 14 95 LxWxH LxWrH etc Number Inches Price Number Inches Price d i MOO II is pretuned to Channel 33 Jumbo PB 6 6 0x4 5x1 4 15 95 PB 102 70x45x14 26 95 2 P 6 Digit Clock Kit 6 0 4 5 1 4 22 95 PB 104 9 8 x 8 0 x 1 4 54 95 transformer THE SINCLAIR PDM35 DC Volis 4 ranges Range imV to 1000V Accuracy ot reading 1 0 1 count Note 10M 1 input impedance AC Volts 40 Hz 5 kHz MOD II 29 95 Kit Four 630 ht and two 300 ht common anode displays Uses MM5314 clock chip Switches for h
265. mperature measurement is also useful in servicing as mentioned earlier But in this case the temperature information is indirect A component overheating be it transistor resistor or any other circuit element is not always a direct indication of which component is at fault Take the amplifier circuit in Fig 3 The correct bias voltages for transistor Q4 are as shown Any variations in the bias volt ages can lead to overheating but the cause could be anything from a simple fault in the transistor through a fault in resistors R8 R9 or R10 to faults in components Q1 Q2 or Q3 The temperature probe will locate only the area of the fault Measurements of voltage levels current and resistance are then necessary for accurate fault location The combination of temperature measurement and the other functions of a normal multimeter make the model PM 2513 a flexible tool R E 6261 RADIO ELECTRONICS Super Accurate Digital Alarm The ideal choice for a first with snooze fea ture AM and PM indicator 12 or 24 hr format and pleas ant green blue digital dis play Budget priced too ADoorbell That Plays Your Favorite Tune A fun way to greet guests with any 16 note tune you pro gram and you can even add remote speakers Custom Car Accessories like the Heathkit GC 1406 Digital Quartz Car Clock shown or it s companion car clock with trip timer and stopwa
266. n and the frequency of the audo sweep generator is decreasing S12 in the LOG position note the turn around point of the beam and the lowest frequen cy reached on the frequency counter Note that it is possible to interpolate frac tions of a hertz by observing the bobble of the counter between two frequencies If for instance it bobbles between 20 and 21 Hz every time the counter re freshes every half second the frequency is 20 5 Hz Or if the reading stays on one number longer than the other the fre quency is closest to that figure Repeat the slow sweep a couple of times to confirm the end point frequen cies Remember to switch S12 as the trace switches directions Set S9 to MANUAL Sweep R4 through its full travel The frequency of the audio sweep gener ator should track R4 Set 512 to LOG and drop 4 to its lowest position Note the frequency of the audio generator Adjust R206 and R209 in the timebase section so that R4 as it is moved through its travel range and S12 is switched produces the same end point frequencies as those pro duced during the automatic sweep mode Trimmer R209 establishes the total sweep width and 8206 sets the center point When these trimmers are properly set R4 with S9 in the MANUAL position will produce the same sweep as the triangle timebase did with S9 and the sweep mode Set S9 to MANUAL Sweep the scope horizontal amplifier by running R4 through its full ran
267. nd from information contained in adjacent fields Four of the five audio channels are digitally encoded into the television picture by a process called DATE digital audio for TV developed by the Public Broadcasting System The teletext channel is carried in the TV signal s vertical interval Pocket brains The successor to the pocket calculator almost certainly will be the hand held memory or micro computer or whatever you want to call it it s so new there s no generic name for it yet The trend started with the pocket memo pad that could store about 30 phone numbers or whatever you wanted to store in it Now memo ries have been sharply expanded and two hand held lan guage translators have come on the market at almost exactly the same time Called the Lexicon and the Craig 100 they are made by different companies but both presumably based on the same Mostek IC They both sell in the 200 range and contain alphanumeric keyboards doing double duty as calculators and metric converters Although there are differences between the two let s discuss the Craig as probably typical of this new type of device Initially finger sized program cartridges are avail able for English French German Spanish and Japanese Three cartridges can be loaded into the battery operated unit at one time and translations can be made from any one to any other Each cartridge has a vocabulary of 1 500 words or phrases in
268. ne polished top quality steel Blue dipped plastic MEET comfort grips In brief the extras that reward 3 you for insisting on hand tools by CHANNELLOCK Send Our Free Catalog CHANNELLOCK INC Meadville Pa 16335 NEL No 436 GS Diagonal Cutter CIRCLE 8 ON FREE INFORMATION CARD particles so that they collide dead center in the black bodied oven Perhaps the logic of this computer could be created with LSI tunnel diodes because tunnel diodes can switch very fast and the LSI techniques can reduce the distances the pulse must travel and thus the delay You ll also need a new semiconductor device a mega thyristor perhaps that can switch thousands of amps at thou sands of volts extremely quickly Printed circuit boards for the control circuitry will be available shortly check your local dealers for a few miles of surplus reinforced 9 inch glass pipe and a couple of hundred gallons of liquid helium The coils can be hand wound with No 000 magnet wire STEVE RIMMER Markham Canada TUNER TEST COMPARISONS The June 1978 issue of Radio Electron ics contained a test on the Luxman model H 1120 receiver The same model was tested by Stereo Heview another reputa ble hi fi magazine The results were pub lished in Stereo Heviews September 1978 issue However the results between the two tests were quite different in some respects The greatest difference appeared in the c
269. nerates a 2 kHz squarewave NOT USED DIS 1 2 3 HP5082 7651 11 C15 047 7 A2 29 R23 470K Burr 28 C osc osc osc IMIL2 C14 38 39 40 22 C13 e R22 p 100k SPACE ON PC BOARD P FOR2 luF IN PARALLEL S2 b On OF R21 9 53K R20 1K R19 7 86K R18 el B 106 AD590K J2 D1 D12 1N4002 CAN that is voltage doubled and clamped to produce the negative supply voltage that is regulated by 7905 regulator IC3 Construction Assembly is simple and straightfor ward the PC foil patterns are shown in Figs 5 6 and 7 and parts placement is shown in Figs 8 9 and 10 Insert and solder all components referring to the parts list and Fig 8 Start with the resis tors and diodes working your way up to the larger items Note that some compo nents are installed on the side of the main PC board opposite the other components as in Fig 9 Many components are top soldered or soldered on both sides of the PC board wherever the PC foil surrounds a component lead There are several feed through locations indicated by a in the parts layout where a short piece of wire clipped from a component lead is inserted through a hole and soldered to the PC foil on both sides of the board The 7905 voltage regulator is installed on side 1 of the main PC board and the 7805 voltage regulator is installed on side 2 using mica insulators and an insulating FIG 5 FOIL PAT
270. ng A magnetic field is a conservative force field like gravity Energy cannot be extracted from it only trans formed For example mechanical energy turning an armature of a generator whose coils are in a magnetic field will be con impart to the reader reaardina the nartici eA EA ee ee MCI Y UAE arra T F1 1 Ie B 97 4 gt c za gt raj LL 1 J ra 9 LE 2 Graymark Model 540 Binary Clock CIRCLE 101 ON FREE INFORMATION CARD IF YOU ARE TECHNICALLY ORIENTED AND would like to have a conversation piece with a purpose the Graymark model 540 Binary Clock Kit should fit the bill The clock is in an attractive simulated wood grain plastic case measuring 7 W X 3 H X 4 inches D witha black and chrome trimmed front panel It storing energy it does not create it The ama mes Alla mx EET Eu contains 11 integrated circuits 10 TTL and voltage regulator 24 resistors 6 capaci tors 2 power diodes signal diode 18 light emitting diodes LED s 2 transistors and a power transformer assembled to three PC boards Three pushbutton switches on the back panel are used to set the time display The front PC board holds the 18 LED s arranged in five vertical columns with either 3 or 4 LED s in each column depending on
271. ng with video graphics for just 99 95 then use low cost add ons to create your own personal system that rivals home computers sold for 5 times ELF Ils low price if you ve pre recorded tape cassettes ELF II Gives You The Power To Make Things Happen Expanded ELF II can give you more power to make things happen in the real world than heavily advertised home computers that for iot more money Thanks to an ongoing committment to develop the RCA 1802 tor home computer use the ELF II products being introduced by Netrontcs keep you right on the outer fringe of today s small computer technology It s a perfect computer lor engineering business industrial scientific and personal applications Plug in the GIANT BOARD to record and play back programs edn and debug programs communicate with remote devices and make things happen in the outside world Add Kluge prototyping Board and you can use ELF II to solve Special problems such as operating complex alarm system of controlling a printing press Add 4k RAM Boards to write longer programs store more inlarmation and salve more sophisticated problems ELF II add ons already include the ELF II Light Pen and the amazing ELF BUG Monitor two extremely recent breakthroughs that have not yet been duplicated by any other manufacturer The ELF 8UG Monitor lets you debug programs with lighten ng speed because the key to debugging s to know what s inside the registers o Ihe micropro
272. nheit to 0 1 degree resolution Rate Monitor provides a direct By Bill Owen A readout of your pulse rate in 54 Audio Test Station Concluding article provides the step by step calibration beats per minute It also procedures beeps to provide an audible by nay Savsan indication Sounds interesting Read about it starting on page 35 VIDEO 39 Videodisc A Look At The Circuitry Part 2 What s inside the new videodisc players by Larry Steckler 74 Service Clinic Intermittents can cause Strange symptoms by Jack Darr 74 Service Questions R E s Service Editor solves technician problems HEART WAVEFORM is detected by Heart Rate Monitor circuit to provide a direct readout in AUDIO 47 Amplifiers ere New audio amplifier circuitry provides ultra wide frequency beats per minute To see how it works turn to response page 35 by Len Feldman 50 R E A L Sound Lab Tests Yamaha CR 2040 Receiver Top of the line receiver rates excellent Ew a MEC M J Y MEI MEI g t TECHNOLOGY 4 Looking Ahead L S UR Tomorrow s news today _ Dave Lachenbruch 55 Make Your Own PC Boards A look at the tools and techniques by James Temple k I 61 Switching Power Supplies How to design your own by L Steven Cheairs 1 COMPLEX WAVEFORMS are needed to com 64 Secret Weapon Against Tough Dogs pare the performance of DC amplifie
273. nistered exam In continuing surveys nearly 4 out of 5 CIE gradu ates who take the exam get their Licenses For professionals only CIE training is not for the hobby ist It s for people who are willing to roll up their sleeves and go to work to build a career The work can be hard sure But the benefits are worth it Send for more details and a FREE school catalog Mail the card today If it s gone cut out and mail the coupon You ll get a FREE school catalog plus com plete information on independent home study For your convenience we ll try to have representa tive contact you to answer any ques tions you may have Mail the card or the coupon or write CIE mentioning name and date of this magazine at 1776 East 17th Street Cleveland Ohio 44114 Patterns shown on TV and oscilloscope screens are simulated IGI Cleveland Institute of Electronics Inc 4776 East 17th Street Cleveland Ohio 44114 Accredited Member National Study Council a C want the best of everything Send me my FREE CIE school catalog including details about troubleshooting courses plus my FREE package Our specialists offer you home study information RE 67 personal a Print Name e m Sometimes you may even have question about specific lesson Address ___________ _ LA Apt s Sa Fine Write it down and mail it in Ci Our experts will answer you
274. nking 100 Hz Up to 45 MHz kHz and MHz Decimals Accuracy is 3 ppm at 25 C less than 30 Hz at10 MHz Overload protected 1 meg input Sensitivity 30 mV up to 30 MHz 3x4V2 With mini rod antenna leads case instructions Requires 9V battery 22 351 Sale 69 95 AC Adapter U L listed 65 731 4 95 Custom Printed Circuit Board Kit Detects one shot low repetition rate narrow pulses scopes miss Combines level detector pulse de tector and pulse stretcher Hi LED indicates logic 1 Lo LED is logic 0 Pulse LED displays pulse tran sitions to 300 nanoseconds blinks at 3 Hz for high frequency signals up to 1 5 MHz With cables 222300 lor 24 95 4511 276 2447 1 69 4518 276 2490 1 49 4543 276 2491 MC14553 3 Digit BCD Counter IC For Low Cost Digital Readout CMOS chip replaces over 8 separate IC s in a digital display circuit Input pulse shaping Master reset pin 16 pin DIP 276 2498 2 99 Computer Data Manuals amp Semiconductor Handbook Intel 8080 8085 Programming Manual Handy reference for programming with Intel s assembly language 62 1377 3 95 Inte Memory Design Handbook Explains use of Intel s memory components and support cir cuits in systems 62 1378 3 95 intel Data Catalog 928 pages of specifications on most of Intel s standard microcomputer related pro
275. nnecl LL 11 10 your antenna terminals instead order RF Modulator 8 95 postpaid Coming Soon 0 D A Converter Controller Board and more Print Name Address City State CIRCLE 44 ON FREE INFORMATION CARD SEA r rc CEN DEALER INQUIRIES INVITED Al 6261 AINE RADIO ELECTRONICS SERVICE QUESTIONS continued from page 74 zontal oscillator is not running which means no DC voltages can be developed There s a starter circuit in this oscillator that applies a DC pulse on the oscillator until it starts In this chassis the circuit is in the 159 volt line activated when the switch is turned on which is dropped through the 12K resistor R229 to pin 10 of the horizontal module This voltage feeds the oscillator When the oscillator starts diode D1 connected to the 24 volt line from the scan derived supply is reverse biased The oscillator is fed from the flyback circuit just as soon as it conducts Check all components in this area as well as the oscillator itself which could be bad MORE DOUBLE TROUBLE I enjoyed the Double Trouble story in the July 1978 Service Clinic I had a similar problem a long time ago on a 1960 Zenith black and white set The customer complaint was there was no video no sound The B line and high voltage are both OK There was a 2 0 volt signal at the video detector test point A signal on the video amplifier grid noth ing
276. o sweep generator and the counter as a digi tal voltmeter The sweep generator then acts aS a voltage to frequency converter This will be used to match the manual and sweep modes of the timebase The log sweep has the greatest resolution at low frequencies and the linear sweep has the greatest resolution at the high end so this is the way we will set them up Set the scope horizontal amplifier to EXTERNAL INPUT Apply the timebase triangle waveform to the scope s vertical and horizontal inputs simultaneously If a line is traced from lower left to upper left across the screen this indicates that a positive volt age drives the scope beam toward the right Similarly a line from upper left to lower right shows that a positive hori zontal input voltage drives the beam toward the eft In this case throw S8 to INVERT so the trace extends across the screen from lower left to upper right This insures that frequency response plots will have the low frequency end at the left and the high frequency end on the right Set R4 to O Switch 53 to 10 Hz Use to estab lish a 10 cm sweep It may be nec essary to use the scope s expanded sweep mode Switch S3 to 002 Set 522 to SEC With the beam traveling left to right and the counter increasing in frequency and with S12 set for linear operation note the end points of the beam and the highest frequency attained As the beam is returning to the left side of the scree
277. o 9 volt plug transform er 12 volt automotive or marine battery systems or from internal rechargeable NiCad batteries for portable operation This thermometer has the range flex ibity and accuracy necessary for many useful applications including e weather station with indoor outdoor monitoring capability e n a ham installation to report local temperature e Medical or veterinary use e Troubleshooting air conditioning and heating systems e Aquarium monitoring e Hothouse greenhouse monitoring e Monitoring solar energy collec tors e Monitoring incubators e Fresh and salt water fishing e On the electronics bench to check semiconductor case temperature measure crystal oven tempera ture etc e Glass fiber mixing e General laboratory use setting water baths ovens etc e Photographic and darkroom use There are many more applications where this digital thermometer can replace me chanical thermometers and provide better Product Engineer Optoelectronics Inc resolution accuracy and readability The heart of the thermometer is the ADS90K temperature sensor This sensor is an IC that when connected to a voltage source produces an output current pro portional to temperature The output cur rent is equal to I pA per degree Kelvin The Kelvin degree is equal in size to the Celsius degree however the Kelvin tem perature scale is offset 273 2 higher than the Celsius scale with O K 273 2 C
278. obe adapter available for protecting input up to 10KV p CIRCLE 48 ON FREE INFORMATION C ee your Oca Hickok distributor or order below gt gt _3___ _____ _____ _ ________ gt ____ _____ _ ORDER CALL TOLL FREE m ELEGTHONICS C EB SPECIFICATIONS DC VOLTS 5 RANGES 0 1mV to 1000V 0 5 rdg 0 5 f s Input imped 10M 11 input 1kV except 500V on 200mV range 54 West 45th Street New York NY 10036 212 687 2224 gt VOLTS 40Hz to 5kHz 0 1V to 600V Accuracy PLEASE SEND ME H 1 0 rdg 0 5 f s 2dB max at 5kHzi Hickok LX303 Digital Multimeters 2 74 95 ea input 600V I RC 3 E 220VAC RESISTANCE 6 LOW POWER MEE 01 ate x Dov Probe Adapter wn Q 14 95 ea 20M9 Accuracy 0 5 rdg 0 5 1 5 CS 1 10A DC Current Shunt gt mid 14 85 Ga 20M range input protected to 120 j VP 40 40 KV DC Probe 35 00 ea ranges Payment encl Bill my Master Charge D VISA DC CURRENT 6 RANGES 01nA Account d Date Accuracy 1 0 rdg 0 5 f s DIMENSIONS AND WEIGHT 5 7 8 X a3 8 x Name 1 3 4 12 oz POWER 9V batt not of Hickok Address _ adapter READ RATE 3 sec OPERAT NG a State Zip 2 Add 3 00 Postage and Handiing NY residents add sales ta
279. on 10 92 case hfe 300 100 5625 1 29 20 for 1 30 600 4 23 4 26 8 50 IF TRANSFORMERS asstsizes 235A9 sess 1 29 100 for 1 30 i D MEE 495 4 94 8 10 TV CHEATER CORD JACKS 45519 gt 1 2 2001 30 40 CHANNEL Order 2273 amp voltage 10 2N3705 TRANSISTORS silicon TO 92 case hfe 150 100 5626 1 29 20for1 30 el 4 1 5V SILVER OXIDE WATCH BATTERIES Specify RW 15 18 5063 1 29 8 for 1 30 f CB BOARD m EN gs 8 3 LCD WATCH READOUTS 3 digits 7 seg dim 17 x 1 25066 1 29 6lor1 30 ms CRIMP ON PL 259 8 100 RED BLOCK DISC CAPS asst values 50 materialia 1698 1 29 200 for 1 30 10 INSTRUMENT KNOBS asst styles and colors shaft s5121 e r 106 E 4 MIKE HOLDERS for CB s and other mobile rigs 5634 ee or 1 COAX PLUG 2for 1 29 50 1N4000 RECTIFIERS asst to 800V u test 22594 eee ees 1 29 100 for 1 30 Quick Easy pher crimping No 4 for 20 UPRIGHT ELECTROS asst d values amp 2 3226 1 29 40 for 1 30 hey Strip m 1 UHF TUNER solid state standard dn e qe in v o appen Mes DD ure 8 6 ITSASNAP 9 VDC red n black 0 2 2852 or 1 u L 30L Get No 1 30 a 6 1400 VOLT RED BALL RECTIFIERS axial 1
280. on page 22 Automotive brain astounds the experts puts both computer_and cruise control at your fingertips For the first time ever you can put a true com puter in your truck or RV which gives you the most effective and functional cruise control ever designed plus complete trip computing fuel management system and a remarkably ac curate quartz crystal time system It is called CompuCruisery So simple a child can operate the new CompuCruise combines latest computer technology with state of the art reliability in a package which will not likely be available on new cars for years to come CRUISE CONTROL WITH A MEMORY UNIQUE SEEK AND HOLD CAPABILITY CompuCruise remarkable cruise control per forms in a totally different manner than any other unit because it is more than a simple speed maintaining device With CompuCruise you establish your desired cruising speed even before you reach the highway and activate the system any time by simply pressing a button CompuCruise then seeks and maintains the desired speed until you override or shut off the system You resume cruise control again at any time by pressing the same button Com puCruise unlike most vacuum mechanical systems is fully electronic more accurate and more reliable than any other unit you can buy INSIOE TEMPERATURE SENSOR COMMAND FLOW SENSOR MOOULE VACUUM SERVO OUfSIDE TEMPERATURE SENSOR CRUISE CONTROL D
281. onstruction 2Year Warranty Hi Lo Power Ohms for in circuit Resistance and Diode Testing 10 Mn AC DC Input impedance Doesn t Load Circuit 200 Hour 9V Battery Life Low Battery Indicator Large LCD Readout 2000 Counts 0 1 Basic dc accuracy One Hand Operation Complete with Battery and Test Leads New Sweep Function Generator m Four Inetruments in one pa eweep Qeneretor func generetor pules generator tone burst generetor The new Fluke 8020A continues the standard of excellence set by the highly tul 8000A multimeter family Many features set the 80204 apart as a truly exceplional instrument Twenty four ranges and 5 functions include measuring capability up to 1000v 750V ac 2A ac dc and 20 HI LO ohms are included for in circuit resistance and diode test capability fn addition a new Conductance lunction allows rasistance and leakage measurements up to 10 000 must for circuit board work and component checking The 8020A has been designed with the user in mind and features exclusive one hand Operallon For harsh service environments ihe 8020A has a ruggedized case and exlensive overload transient protection backed up by 1 year warranty Long term stability 1 year calibration cycle excellent with Only three cal adjustments Up to 200 hours 91 continuous Operatlon can be expected from a single OV alkaline battery FREE CASE with 80204 New Portable Digital Capac
282. ontributing editor Earl Doc Savage K4SDS hobby editor Ruby Yee production manager Robert A W Lowndes production associate Marie J Stolfi production assistant Harriet Matysko circulation director Arline R Bailey advertising coordinator Cover design by Louis G Rubsamen Cover photo by Small Radio Electronics is a member of the nsti tute of High Fidelity and is indexed in Applied Science amp Technology index and Readers Guide to Periodical Literature NEW IDEAS All published entries will earn 25 upon publication Selections will be made at the sole discretion of the editorial staff of Radio Electronics agree to the above terms and grant Radio Electronics Magazine the right to publish my idea declare that the attached idea is my own original materi al and that its publication does not violate any other copyright also de that this material had not been previously published Title of Idea Print Name Date City State ZIP Mail your idea along with this coupon to New Ideas Radio Electronics 200 Park Ave South New York NY 10003 To sell an advanced DMM for under 70 we had to cut corners And we sure did First we cut off the dealer s mark up Then we shaved off the overhead costs of national sales offices and warehouses Finally as if that wasn t we even cut out the high labor costs of factory EE lines All in all we cut ove
283. oo It is not however a portable battery operated instrument and is subject to false readings from muscle and sensor movements There fore its best application might be as a before and after measurement while comfortably seated or otherwise station ary In addition it s fun and satisfies your curiosity to know your heart rate and the meter display it directly in BPM Beats Per Minute Design objectives in devising the Car diotach were to use inexpensive readily available components provide an accura cy of at least 5 and avoid potential shock hazard All these criteria were met far beyond expectations The accuracy of the instrument depending upon meter linearity is better than 5 the unit costs less than 100 to build and all the components except for the sensor can be obtained from mail order distributors Circuit description The circuit senses each heartbeat via an infrared optocoupler sensor and triggers on the R wave which is the largest amplitude signal found in the heartbeat waveform see Fig 1 Because of this it was decided to simply use amplitude discrimination in order to have the R wave trigger the tachometer circuit Thus the circuit directly displays the R wave repetition rate FIG 1 HIGH AMPLITUDE PULSE of the heart beat waveform Figure 2 is the block diagram of the Cardiotach circuit Fig 3 is the complete schematic diagram The circuit is divided into eight
284. ordinary hobby tools for your elec tronic work A small vise a hobby anvil tack hammers center punches reamers pliers etc Don t skimp on quality in the tools you collect An excellent addition to your tool collection is an Xacto knife set usually sold with three holders and an assortment of knife blades The No 5 and No 17 blades are handy for PC board work There s also an Xacto hobby sawblade This is a fine toothed saw that cuts a inch width and can be used to cut the PC boards apart The Xacto hobby sand block also comes in handy for smoothing an edge of a board Art supplies Once you have started your hobby tool collection and have added the basic drill bits knives and lighting instruments you should give some thought to the art supplies that are needed Of course the basic necessities are a drawing board and draft ing instruments Here s a tip that can save money and allows you to have an excellent drawing table Let s assume that you do have a desk of some sort to hold your drawing supplies This desk should be separate from your basic work area It should have several drawers to hold your supplies To this desk you can add your drawing board for all the schematics and logic diagrams you will be making Consider a drawing board with a metal edge guide about 25 inches wide to 30 or 36 inches long Costs will be around 20 to 25 for the drawing board Obtain a pair of hinges not too large with a removable typ
285. osition of leadership to maintain some of the ways wc hang onto it Our step by step learning includes hands on training At CIE we believe theory is important And our famous Auto Programmed Lessons teach you the principles in logical steps But professionals need more than theory That s why some of our courses train you to use tools of the trade like a 5 triggered sweep solid state oscilloscope you build yourself and use to practice trouble shooting Or a beauty of a 19 inch diagonal Zenith solid state color TV you use to perform actual service operations Pick the pace that s right for you CIE understands people need tolearn at their own pace There s no pressure to keep up slow learners hold you back If you re a beginner you start with the basics If you already know some clec tronics you move ahead to your own level Enjoy the promptness of CIE s same day grading evele When we receive your lesson before noon Monday through Satur day we grade it and mail it back the same day You find out quickly how well you re doing CIE can prepare you for vour FCC License For some electronics jobs you must have your FCC License For others employers often consider it a mark in your favor Either way it s government certified proof of your specific knowledge and skills More than half of CIE s courses prepare you to pass the government admi
286. oting is easier and you can make changes if the circuit requires it Once you have developed board making skills photocopying methods are just a step away Printed circuit etchants Perhaps one reason that many hobbyists do not attempt to make their own PC boards is because they are afraid of the etchant chemicals Ferric chloride is the only safe etchant to use on the hobby level It is a mild acid that works well on copper but it can leave terrible stains if spilled onto the floor or on your clothes The solution is to do your etching in a work area where it won t matter if a spill happens and wear old clothes Plus make sure you read the instructions JAMES E TEMPLE Important Never use metal trays to do your etching in partic ularly aluminum Always use glass or heavy plastic etching trays These specialty trays are not expensive When you consider that many household chemicals lye cleaning solutions etc must also be handled in a similar manner the ferric chloride etchant is no more dangerous than any of them when treated properly When small children are around the chemicals should be locked up securely The safe handling of any chemical results from understanding what the chemical is and how it is used When you work with ferric chloride etchant and stay away from others unless you know what you are doing cover the floor with old newspapers Keep a plastic pail filled with water nearby to wash off the PC board after etc
287. ours minutes and hoid functions Hours easily viewable to 30 feet KG C0 M M81 iPICa TO Counter case Range Iv 10 S00 2 counts 20 2 100 MHz Range Four power souces 6 Provides 3 basic waveforms 115 operation 6 so Couns 6 LEO Olspiay banenes 110 220V with sine triangle amp square wave 12 or 24 hour operation Range 1 n4 to 200 Crystal controlled timebase charger 12V with auto a Frequency range from 1 II 0 includes all comPonents Case and wall transformer Accuracy of reading 1 0 1 count e Fully Automatic lighter adapter and external 100K Hz Note Max resolution 0 1 aA Resistance 5 ranges Range 11 te 20 Accuracy 0 reading 1 5 1 count Also provides 5 junction test ranges Options AC adapter tor ME xm x Twin e Portable completely 7 2 10V power supply Sa 175 MAX 100 134 95 x 5 637 Size 614 x 314 x 134 e Output amplitude from Q volts to over 6 volts peak to peak Uses a 12V supply 6V split supply F incl chip P C board compo 747 29 95 Bright 300 ht comm cath ode display 117 V 60 Hz power Powar Supply 9 V battery or L s Uses MM5314 clock chip De luxe padded Sodat AE Battery not tnt nents and instructions eSwitches fo
288. panel using shoulder washers and nylon spacers Check to make sure that there is no continuity between the power jack and the rear panel Use stranded hookup wire to connect the power jack bracket and center pin to PC board loca tions El and E2 Probe construction Remove the case leads from the ADS90K temperature sensors Cut the 39 8 INCHES d o 0 065 10 FIG 7 DISPLAY BOARD uses this pattern with edge pads to mate with those on main board Resistors V Watt 5 unless otherwise noted Ri 1000 ohms R2 R5 47 000 ohms R3 150 ohms R4 820 ohms R6 R12 R14 R16 R18 R20 1000 ohms vertical mount trimmer potentiometer Ar R10 813 R15 R18 788D ohms 1 H8 11 800 ohms 1 11 4029 ohms 1 R17 821 9530 ohms 1 R22 100 000 ohms Aes 470 000 ohms 24 1 R25 470 ohms 26 100 ohms Capacitors C1 2200 uF 16 volts electrolytic C2 C8 38 aF 10 volts tantalum C3 C10 18 01 zF ceramic disc C4 C11 01 uF polyester G6 47 aF 16 volts electrolytic C8 100 L 25 volts electrolytic PARTS LIST C12 0 1 IL Mylar 13 100 pF dipped mica C14 0 22 uF polyester C15 047 oF polypropylene Semiconductors D1 D13 144002 DIS1 DIS3 HP5S062 7651 7 segment LED display common anode right hand decimal point high efficiency RED Di54 HP5082 76585 universal overflow display
289. pen Contact Color Red White Blue Green Black 3 1 00 N Ctose also Available 50 LARGE QTY AVAILABLE FLASHER LED Unique design Combines jumbo red LEO with an IC flasher chip in one package Operates directly from 5V 7V DC No dropping resistor needed Pulse rate 3Hz 5V 20 MA 2 for 2 20 PROFESSIONAL PANEL METERS A 0 50UA 8 50 ea 8 0 30VDC 8 50 ea 0 50 0 8 50 ea D 0 3ADC 3 00 ea 0 100VDC 9 00 ea I C TEST CLIPS Sane as the 2 clips With 20 Long L 5 a In Black and Red Colors 2 75 per pair Mini size 1 x 3 r Supply voltage 1 5 12v Type MU 52E All meters white face with black scales Plastic cover Idea for Alarm or Tone indicator 1 50 each 779 FORMULA INTERNATIONAL INC gt SHIPPING AND HANDLING CHARGES Send 1 00 v s nder 0 00 purchase Over 0 00 purchase For Detailed gt 5 ___ ___ Outside EIA inciudes Mexico amp Canada gt Cataiogue gt L Minimum Order 10 00 Calif Residents Add 6 28 Phone Orders Accepted on Visa or MC ONLY NO r3 o D Store Hours 10 7 Mon thru Sat 4 12603 CRENSHAW BLVD HAWTHORNE CA 90250 PHONE 213 973 1921 213 679 5162 gt CIRCLE 13 FREE INFORMATION 6461
290. peration when a phono cartridge is connected This anomaly incidentally prompted the IHF commit tee which was involved in producing new standards of amplifier measurement to specify a more realistic termination of the phono inputs of an amplifier or pream plifier when making signal to noise mea surements The phono input termination specified in the new standards consists of a 500 mH 10 inductor in series with a 1000 ohm 10 resistor and a 125 pF 10 capacitor in parallel with the L C circuit Amplifiers using the design approach V PLAYING YAMAHA y 0 IV Y ty FIG 4 DESIGN VARIATIONS in DC amplifiers that are currently being produced by different manufacturers shown in Fig 4 include Kenwood s model KA 7300D model KA 7100D and model 8100 except that the input capacitor to the tone control section is eliminated In Fig 4 c both the power and the tone control amplifier stages have elimi nated the capacitor in the feedback loop and while the output capacitor has been eliminated from the power stage input and output capacitors are still present in each of the separate sections forming a low frequency time constant circuit This design approach is used in Pioneer s mod el A 004 integrated amplifier Figure 4 d shows both the preamplifi er equalizer and power amplifier stages are DC designed and have eliminated input capacitor coupling The design em
291. plug or plain wire 644 long 2 89 Kleps 1 Economy Kleps for light line work not lab quality Meshing claws 412 long 1 09 Pruf 10 Versatile test prod Solder connection Molded phenolic Doubles as scribing tool Bunch pin fits banana Jack Phone tip 51 2 long 99 Allin red or black specify Add 506 postage and handling Write for complete catalog of test probes plugs sockets connectors earphones headsets miniature components Available through your local distributor or write to RYE INDUSTRIE INC 129 Spencer Place Mamaroneck N Y 10543 In Canada Rye Industries Canada Ltd CIRCLE 27 ON FREE INFORMATION CARD Pruf 10 I DUS TR E SB IN ONE a Clut of Circuit ory i x Factory Wired amp Tested 32 71 Easy to Assemble Kit 21 79 YOU DON T NEED A BENCH FULL OF EQUIPMENT TO TEST TRANSISTOR RADIOS All the facilities you need to check the transistors themselves and the radios or other cir cuits in which they are used have been ingeniously engineered into the compact 6 inch high case of the Model 212 It s the transistor radio troubleshooter with all the features found only in more expensive units Find defective transistors and circuit troubles speedily with a single streamlined instrument instead of an elaborate hook up a CRACK AREE ES Features 625 Broadway New York 12 N Y Checks al transistor types high low power Checks DC
292. pped volume control loudness systems all but use less The six remaining rotary controls take care of bass treble and mid range tone adjust ments Here also Yamaha has gone far beyond what is normally found on most receivers Each tone control has a companion control that determines its turnover frequency in the case of the BASS and TREBLE controls or its center frequency in the case of the midrange or PRES ENCE control The turnover point of the treble control may be varied from 2 kHz to 10 kHz while that of the BASS control may range from 100 Hz to 500 Hz and the center frequency of the midrange control can be varied from 1 kHz to 6 kHz This control versatility comes very close to that of a true parametric equalizer and as far as we know is not found on any other integrated receivers to date The rear panel of the model CR 2040 contains spring loaded color coded terminals for speaker connections Also included are the usual phono and high level input jacks tape input and tape output jacks a pair of pream plifier out jacks and jacks for the adaptor circuit to connect noise reduction units expan ders time delay devices etc It is also possible to connect a tape deck to the preamplifier out terminals if you want to pre equalize tone control signals for recording A view of the rear panel is shown in Fig 2 Balanced 300 ohm FM antenna terminals plus an AM antenna and ground terminal are also provided as is an
293. r 100 worth of corners But not a single one that affected the quality and performance of our new DMM Don t let our low price fool you Because Sabtronics sells factory direct without all the hidden charges a dealer would track on we can offer the superior 2010A DMM kit for a surprisingly low 69 95 Surprising because you get the accuracy features and performance you d expect from the high priced units The 2010A offers you the long term accuracy of a laser trimmed resistor network an ultra stable band gap reference element and single chip LSI circuitry all in a compact rugged human engineered housing With 31 ranges and 6 functions you can measure AC and DC volts from 100 pV to 1000V AC and DC current from 0 1 uA to a surprisingly high 10A resistance from 0 1 Q to 20 MQ Typical DCV and Ohms accuracy is 0 1 1 digit And you see these precise readings on a bright 3 digit Brief Specifications DC Volta 1004V to 1000V in 5 ranges AC Volts 1004V to 1000V in 5 ranges DC Current 0 1 to 10 A in 6 ranges AC Current 0 1 to 10 A in 6 ranges Resistance 0 19 to 20 in 6 ranges Diode Test Current 0 14A 104A 1mA ACV Frequency Response 40Hz to 40kHz input Impedance 10 MQ on ACV and DCV Overload Protection 1200 VDC or RMS on all voltage ranges except 250 or RMS on 200mV and 2V ranges Fuse protected on ohms and mA ranges Power Requirement 4 5 to 6 5 VDC 4 C cells optional N
294. r gives out date day Dual time zone for any two Cities of the world at your 24 hr alarm 10 min snooze time AM PM indicator Power interrupt indication Green color 0 6 display 110V AC 60Hz input Factory assembled NOT A KIT 17 50 EACH LCD CLOCK MODULE 3 WAY PROTECTION This alarm protects you and itself Entering protected area will set it off sounding your car horn or siren you add Any change in vol tage will also trigger the alarm into action If own choice cables within passenger compartment are cut With light switch to allow vau io sem M ae the unit protects itself by sounding the alarm p es SPECIAL 19 95 ALL UNITS FACTORY ASSEMBLED AND TESYED NOT TIMATRON RACK MOUNT 0 5 LCD 4 digits display X controlled circuits D C powered 1 5V battery 12 hr 24 hr display 24 hr alarm set FULL WARRANTY JUMBO 1 LED ALARM CLOCK MODULE Assembted not a kit TYPE CABINETS are of aluminum and ma chine made to very high preci sion quality with sleek black 60 min countdown timer On board dual back up lights Dual time zone display Stop watch function Features 1 4 digits red LED display 12 hours real time format 24 hours atarm audio output just add speaker Power failure indicator Count down timer 59 mins
295. r hours minutes carrying waliel Sockets Standard 4mm tor and hold modes resilient plugs 4 9 95 5 easily viewable to 20 tt JE2206B 5 Digital Multimeter 59 95 completely assembled Simultated walnut case 115 VAC operation ACCESSORIES FOR MAX 100 12 or 24 hr operation PDM AC 117V AC Adapter 6 95 Mobilis Charger Eliminator IDEAL FOR TRS 80 CASSETTE CONTROLLER tinci all components case amp i didi use power from car battery Model 100 CLA 3 95 E JE701 wail transformer PDM DP Charger Etiminator Plug Jack interface to any e Size 6 x 3 1 8 x 1 Deluxe padded carryingcase 6 95 ito vac Model 100 9 95 computer system requiring remote control of cassette functions The CC100 controls cassette motor functions monitors tape location with Its internal speaker and requires no power Eliminates the plugging and unpiugging of cables dur 00 100 ing computer loading opera tion fn from cassette 3 29 50 63 Key Unencoded Keyboard 6 Digit ClockKit 19 95 REGULATED POWER SUPPLY News REMOTE CONTROL 5V 1 AMP TRANSMITTER amp RECEIVER JE200 POWER SUPPLY JE205 gt Uses LM309K 5V 9V and t12V Heat sink provided DC DC converter w PC Board construction 5V input Provides a solid 1 amp tee 5 volts switching Eo wem pu constructor and 12V with JE205 Adapter Piggy ba
296. r tax Dutside USA add 10 for air mail postage and handling no C O D s Checks and money orders must be payable in US dollars Parts kits include sockets for all ICs components and circuit board Documentation is included with all products Prices in US dollars No open accounts To eliminate tariff in Canada boxes are marked Computer Parts Dealer inquiries invited 24 Hour Order Line 408 226 4064 For free catalog including parts lists and schematics send a self addressed stamped envelope ELECTRONIC SYSTEMS Dept RE7 P 0 Box 21638 San Jose CA USA 95151 T V TYPEWRITER Stand alone TVT 32 char line 16 lines modifications for 64 char line included Parallel ASCII TTL input Video output 1K on board memory Output for computer controlled curser 9 Auto scroll Non destructive curser Curser inputs up down left right home EOL EOS Scroll up down Requires 5 volts at 1 5 amps and 12 volts at 30 mA All 7400 TTL chips Char 2513 Upper case only Board only 39 00 Part No 106 with parts 145 00 Part No 106A INTERFACE e Play and record Kan sas City Standard tapes e Converts a lowcost tape recorder to a digital recorder e Works up to 1200 baud e Dig ital in and out are TTL serial e Output of board connects to mic in of recorder e Ear phone of recorder con nects to input on board e No e Requires 5 volt
297. r to the foil side of the PC board and on page 41 step 35 should be printed in red The operational theory of the clock is extremely detailed and is accompa nied by many block diagrams charts timing diagrams and even IC data sheets A complete parts list and a schematic diagram of the clock are also included The PC boards and parts are all new and of top quality The LED s seem to be graded for equal brightness and an assembly aid is pro vided for their proper positioning and align ment Every single component needed is in cluded even a nylon cable tie and solder The PC boards are masked to avoid solder bridges and parts locations are silk screened on the component side of the boards to insure proper assembly The only tools you ll need are 20 to 30 watt soldering iron a wire stripper diag onal cutters a Phillips head screwdriver and long nose pliers Constructing the kit is simple following the detailed step by step instructions but it is time consuming There are over 350 solder connec tions 21 jumpers and 29 board interconnect ing wires It took four hours to assemble fol lowing the Mode II red instructions and working slowly and carefully to avoid later problems This care was rewarded by the clock working perfectly when plugged into the 110 VAC line Time setting is accomplished easily with the SLOW FAST and HOLD switches once the time readout format is understood Count ing is controlled by the lin
298. rgy So here s an impossible idea High school physics taught us that mat ter and energy are interchangeable More to the point one gram of matter is inter changeable with an enormous quantity of energy in other words if you could convert one gram of matter into energy with 700 efficiency you could light up New York for a year For practical purposes 100 conversion does not exist The most efficient conver sion process to date atomic reaction involves huge quantities of energy from very little fuel The problem then is to come up with a way to produce a technique of matter to energy conversion which is almost completely efficient controllable and suitable for use with abundant and cheap materials We have all learned that matter must occupy volume Clearly then it must be come something other than matter and all that is left is energy Therefore let s postu late that if you squeeze something hard enough it will interchange its volume for an equivalent quantity of energy The probiem lies in squeezing hard enough You obviously also don t want to squeeze too much matter at a time or the energy produced becomes difficult to con trol Therefore perhaps sufficient pressure could be obtained by two rapidly moving very small particles colliding with each oth er The machinery necessary to do this could be based on the particle accelerator a device that uses switched magnetic fields to accelerate atomic partic
299. rices model 3030A 365 battery pack 45 Ballantine Laboratories Inc Box 37 Boonton NJ 07005 MULTIPLE OUTPUT POWER SUPPLY model 1650 is designed for solid state equipment and provides three isolated outputs 5 VDC 5A and two 25 VDC A and B supplies at 0 5A Automat CIRCLE 152 ON FREE INFORMATION CARD ic tracking feature controls supply B when supply A output is varied is PWM controlled via an opto isolator Other features include automatic current limiting and complete overload protection on all ranges and outputs Suggested retail price 275 B amp K PRECISION Dynascan Corp 6460 W Cortland St Chicago IL 60635 ELECTRONIC IGNITION SYSTEM Mark 10 model Z is designed specifically for 4 cycle engines and provides a capacitive discharge pulse both in front of and in addition to regular spark pulse Reduces need for tuneups improves spark plug life acceleration and idle Weather shock and vibration proof the completely as MODEL Z Mai UNAM CIRCLE 153 FREE INFORMATION CARD sembied model 2 installs easily Price 69 95 Delta Products I C Box 1147 Grand Junction CO 81501 NYLON TIE amp WIRE CONNECTORS E Pak Merchandiser is an assortment of nylon ties and wire connectors packed in see through bags and ge L EVERY MEEO lon Tie 1 i a Ms i E n CIRCLE 154 ON FREE INF
300. rs To find Temperature measurement helps localize faults out why turn to page 47 by Henk Onstee and Stu Rauch 66 Hobby Corner Modification for digital clocks provide long delay alarm by Earl Doc Savage K4SDS 68 State 0Of Solid State New A D converter fast enough to digitize video signals by Karl Savon s Radio Electronics Published monthly by Gernsback Publications Inc 200 Park Avenue South New York NY 10003 Phone 212 777 6400 Controlled Circulation EQUIPMENT 24 Graymark Model 540 Binary Clock Postage Paid at Concord NH ore yen ara pien stem C rate U S A and U S possessions 9 98 Canada 12 98 25 BSR Syst X10 AC Remote Control Other countries 14 98 Single copies 1 25 1979 by 26 RCA COSMAC Evaluation Kit Gernsback Publications inc All rights reserved Printed in U S A ISSN 0033 7862 Subscription Service Mail all subscription orders e changes correspondence and Postmaster Notices of undelivered copies Form 3579 to Radio Electronics Subscription Service Box 2520 Boulder CO 80322 DEPARTMENTS 112 Advertising Index 90 Market Center 76 Computer Products 88 New Literature A stamped self addressed envelope must accompany De submitted manuscripts and or artwork or photographs if 6 Editorial 78 New Products their return is desired should they be rejected We i disclaim any responsibility for the loss or damage of 113 Free Information Card 85 Stereo Products manuscripts and or a
301. rtwork or photographs while in Our 12 Letters possession or otherwise a As a service to readers Radio Electronics publishes available plans or information relating to newsworthy products techniques and scientific and technological developments Because of possible variances in the quality and condition of materials and workmanship used by readers Radio Electronics disclaims any responsibility for the safe and proper functioning of reader built projects based upon or from plans or information published in this magazine 6261 RADIO ELECTRONICS Videodisc jockeying With one videodisc system on the market in limited quantities Philips MCA Magnavision and one promised for late 1980 or 1981 it would appear that there would be little room for additional systems Although many different systems have been demonstrated in the past it has been tacitly acknowledged that Philips and RCA would fight it out between themselves for the upcoming videodisc market Of course this left the Japanese without an entry in videodiscs but because of their preoccupation with videotape at the present time some knowledgeable industry sources assumed the Ja panese would sit this one out and when the proper time came adopt either the Philips optic
302. s RICHARD ALLRAN Box 974 Dept B Waynes ville NC 28786 RCA Zenith original TV parts Dealer prices fast service Send part and model numbers L I ELECTRONICS 981 Sunrise Hwy Bayshore NY 11706 516 666 7360 RESISTORS watt resistors popular sizes 3 cents each MILLIKAN SURPLUS 5118 Jason Houston TX 77096 MATCH your skills against people from all over the world with our computer games by mail WIZARDS ARSENAL Box 20183 Lansing MI 48901 Torun your own classified ad put one word on each of the lines below and send this form along with your check for 1 50 per word minimum 15 words to Radio Electronics 200 Park Avenue South N Y N Y 10003 ORDER FORM PLEASE INDICATE in which category of classified advertising you wish your ad to appear For special headings there is a surcharge of 10 Plans Kits Education Instruction Business Opportunities Wanted For Sale Special Category 510 PLEASE PRINT EACH WORD SEPARATELY IN BLOCK LETTERS YOUR PHONE CALLS ON Record incoming and outgoing calls automatically with this all solid state unit connected to your telephone jack and tape recorder Starts record ing when phone is lifted Stops when you hang up Making permanent record Easily installed No extra monthly phone charges FCC APPROVED 2 t 4 x 1 3 4 x 3 4 24 50 VOICE ACTIVATED CONTROL SWITCH Self contained solid state Exce
303. s charge displays Compiete list of manufacturer s distributors is included Beckman Instruments Inc Technical Information Dept 2500 Harbor Fullerton CA 92634 CIRCLE 144 ON FREE INFORMATION CARD MICROCOMPUTER BOOK CATALOG lists 150 books designed to help users understand and operate their personal computer systems and includes material geared to both the neophyte and the experienced computer operator BITS INC Dept 41 25 Route 101 West Peterbor ough NH 03458 R E CIRCLE 145 ON FREE INFORMATION CARD VIDEODISC continued from page 41 Nobody does it __33_ lt 333 3333 _ Fig 9 The signal from the VHF modulator rides a 10 VDC level When the player is switched on the 10 VDC appears and switches on diode D1 through R1 The signal is thus coupied through C2 and the balun to the TV set s antenna terminal of the TV In addition relay K1 is energized and the normally closed contacts are held open thereby disconnecting the external VHF antenna When the player is off the 10 VDC is absent K1 is de energized and its contacts close The external VHF antenna better thanNiZ The Everything Scope That s the end of our coverage of the Magnavision videodisc player A complete Magnavision manual for the model VH8000 can be purchased from Magnavox Service Training Depart ment Fort Wayne IN 46804 R E d Dual Trace WO 555 750 quem F 13 ZH VIDEO gt 3 MONI
304. s low power drain e Board only 7 60 Part No 111 with parts 27 50 Part No 111A UART amp HEX ENCODED BAUD RATE KEYBOARD _ GENERATOR ruis keyboard has 19 keys 16 encod ed with 3 user defin able The encoded TTL outputs B 4 2 1 and STROBE are debounced and available in true and complement form Four onboard LEDs indicate the HEX code generated for each key depression The board requires a single 5 volt supply Board only 15 00 Part No HEX 3 with parts 49 95 Part No HEX 44 pin edge con nector 4 00 Part No 44P Converts serial to parallel and parallel to serial Low cost on board baud rate gener ator Baud rates 110 150 300 600 1200 and 2400 Low power drain 5 volts and 12 volts required TTL com patible All characters contain a start bit 5 to 8 data bits 1 or 2 stop bits and either odd or even parity connections go toa 44 pin gold plated edge connector Board only 12 00 Part No 101 with parts 35 00 Part No 101A 44 pin edge connector 4 00 Part No 44P DC POWER SUPPLY e Board supplies a regulated 5 volts at 3 amps 12 12 and 5 volts at 1 amp e Power required is 8 volts AC at 3 amps and 24 volts
305. s add sales tax lt Counter We Will Beat Any Advertised Price 8558 Conklin 1 Farmingdale 11735 CIRCLE 38 ON FREE INFORMATION CARD 6461 1 RADIO ELECTRONICS M The incredible MICROPROCESSOR 5 EE Pennywhistle 103 VW 80804A 8080A SUPPORT DEVICES T YMICR0PR0CESSOR MANUALS 8080A CPU 995 280 User Manual 7 50 Transistor Checker Completely Assembled Battery Operated Fir 8 Bit 3 25 M CDP1802 User Manual 7 50 14 Pnonty Interrupi Control 5 95 M 2650 User Manual 5 00 pe 3 SR 8216 Bi Directionai Bus Driver 3 49 transistor tee 8224 Generatormer 98 news J Q kit Only Ot Ur of TH ob E 8226 Bus Driver 3 49 2513 2140 Character Generator upper case 9 95 the JA CARES e 8228 System Controller Bus Driver 9 85 2513 3021 Character Genetator lower case 9 95 The Pennywhistle 103 is capable of recording data to and trom audio tape ee the front panel 8238 System Controller 595 2516 Character Generator 10 95 critical speed requirements tor pe recorder and it is able 10 communicate directly E BUM or ceca ca 8251 Prog Comm
306. so have several on hand lacquer is rough on the bristles Also brushes as fine as this do not hold a great deal of resist on them and a line of about inch is usually the longest line you can draw directly A 2 inch long line will then be applied in four strokes Merely drawing a pencil guideline also helps When you consider any PC board layout you will note that most of the lines are straight and very few curves are involved The IC DIP packages permit a layout using straight lines which are merely the connecting lines between the various IC pads By getting the feel of the brush and the resist lacquer and applying the resist in short strokes any size line can be made Remember you have laid out the interconnecting lines on paper and you are only copying these lines on the PC board by using the resist paint This is why a film overlay comes in handy to check on the line drawings made on the copper board Using a brush and resist paint is not the only way that you can draw in the pads and the lines Bishop Graphics also offers direct transfer of etch resist pads plus a fine line that comes in tape form It is applied between the contact points cut and pressed firmly to the board These direct resist material transfers are fine for a one shot PC board but are not reusable They are not expensive to use but some skill should be developed in handling them The trick is to have a dry clean copper PC board If the material does not stick f
307. ss Man 25 mv fo 65 mHz 50 150 mv to 680 mHz 1 0 VAC 5 Watts 12 400 Size 6 4 x 27 high aluminum case 2 Ibs CS 13 units allsocketed COUNTER 1 50 FREQUENCY 91858 giaatronias The CT 50 is versatile and precision frequency counter which will measure frequencies to 60 mHz and up to 600 mHz with the CT 600 option Large Scale Integration CMOS circuitry and solid state display technology have enabled this counter to match performance found in units selling for over three times as much Low power consumption typically 300 400 ma makes the CT 50 ideal for portable battery operation Features of the CT 50 include large 8 digit LED display RF shielded all metal Case easy pushbutton operation automatic decimal point fully socketed IC chips and input protection to 50 volts to insure against accidental burnout or overload And the best feature of all is the easy assembly Clear step by step instructions guide you to a finished unit you Can rely on Order your today 50 60 mHz counter kit 89 95 CB 1 Color Tv calibrator stabilizer 14 35 CT 50WT 60 mHz counter wired and tested 159 95 DP 1 DC probe general purpose probe 12 35 CT 600 600 mHz scaler option add 29 95 HP 1 High impedance probe 15 35 SPECIAL T CAR FM MINI KIT CLOCK 741 mini dip 12 2 00 B1 FET mini dip 741 type 10 2 00 A super high pertormance FM wireless
308. starts flashing and beep tones are heard then set the control a little beyond that point After from four to six heartbeats the meter should begin to move upward It will overshoot then settle back down to the correct measurement Double trigger ing and the resulting high meter reading is usually caused by the excessive gain that results from an improperly set sensi tivity control and from 60 Hz hum If the sensitivity control doesn t seem to be causing the problem shield the sensor from any direct AC operated light source Multiple triggering can also re sult if the power supply goes out of regu lation This can be caused by an under rated transformer or too much beep tone volume The beep tone is intended to be low in volume so it won t be obtrusive Changing the value of R31 for higher volume may result in too much current drain from the 12V supply and fced back into the rest of the circuitry Some people with chronically cold dry fingers may have difficulty using the Cardiotach In these cases the sensor can be used on the earlobe or on the back of the hand arm or other surface that has better circulation Adhesive tape can be used to hold the sensor in place One final word The Cardiotach is a useful instrument for biofeedback and simple heart rate monitoring It is NOT a diagnostic device nor is it designed to effect any cures Medical problems are best left to the professionals R E DIGITAL THERMOMETER Continue
309. t gives you a chance to write machine language programs and machine language is the lundamental language of all computers 01 course machine language is only a starting point You can also program ELF II with assembly language and tiny BASIC But ELF II s machine language capability gives you chance 10 develop a working knowledge of computers that you can t get from running only Netronics R amp D Ltd Dept RE7 L ACA COSMAC ELF II 99 95 plus 3 postage and p handing requires 6 3 10 8 vot AC power IV Power Supply 800VII60 4 95 postpaid 1807 User s Manual postpaid lan Putin s Short Course Qa Microprocessor amp Computer Programming teaches you just About everything There I 10 know III ELE 1E or any RCA 1802 computer Wrilten in non technical ALSO AVAILABLE FOR ELF Il 3 p amp h 333 Litchfield Road New Milford CT 06776 Yes want my own computer Please rush me ianquage 11 5 learning breakthrough for engineers and laymen 5 postpaid O Deluxe Metal Cabinet with piexigias dust cover for ELF II 29 95 plus 2 50 p amp h am also enclosing payment including postage amp handling tor the items checked below O p want my ELF II wired and tested with power Supply RCA 1802 User s Manual and Short Course all for just 149 95 plus _ Write and run programs the very first night even never used a computer before You re up and runni
310. t as do audiophiles selecting separate components In the past such versatility has often meant compromises in the sound That 15 definitely not the case with the model CR 2040 You will probably agree with us that it 15 difficult if not impossible to detect any differ ence in sound between this receiver and much higher priced separate components having an amplifier with an equivalent power output When we first began testing and using the CR 2040 we were asked to guess its suggested retail price the final price had not yet been fixed We ventured a guess that turned out to be 200 more than Yamaha s final suggested retail price Need we say more R E 6261 RADIO ELECTRONICS D UU Stati Audio Test n PART 5 The utility and overall accuracy of the Audio Test Station will depend on the skill and care used in its calibration This article walks you step by step through the calibration process RAY DAVISON IF YOU HAVE COMPLETED THE AUDIO TEST System your next step is proper calibra tion so you can take full advantage of its many features Calibration steps will be performed stage by stage so the precision of the sections calibrated during the initial stages can be used in later proce dures Figure 16 shows the locations of the various trimmers that you will be adjusting Timebase calibration Connect a reasonably well calibrated scope to Jack J1 The scope is
311. t pin 15 In the diagram they are shown in their normal position with neither channel muted The left channel audio from the demodulator passes through the electronic switch and out through the left audio output jack It also passes through pin 7 of the modules and into the adder stage on the sound demodulator II module The right channel audio signal from the 2 8 MHz FM demodu LEFT RIGHT 9 9 I2V lt SOUNL 1DEMOD I I LEFT 703986 L R TO MODULATOR FM I souno I FIG 4 SOUND SIGNAL PROCESSING CIRCUIT consists of two sound demodulator modules lator is also applied to the adder as well as to the right audio output jack through its electronic switch Thus the output of the adder is L R audio This sum signal is applied to the VHF modulator to produce the sound carrier If the left channel is muted by the user depressing the front panel sound I button the voltage on pin 15 of the sound demo dulator I module goes high 5 volts and switches the elec tronic switch to position B The left audio is now disconnected and goes nowhere The right audio signal is routed to the left audio output Jack and also through pin 7 to the adder There fore the right audio signal appears at both adder inputs and at both rear panel audio output jacks The output of the adder is right channel only and the TV will now produce only right channel sound V
312. t the boiling point of water then the error will be 1 The error would be 0 5 C if the meter were readjusted to read 0 5 C at the freezing point and 100 5 C at the continued on page 83 O nderstanding DC Amplifiers Ultra wide frequency response and reduced harmonic and transient in termodulation distortion are some of the advantages of DC amplifiers Here s a look at how these DURING THE PAST TWO YEARS OR SO SEV eral manufacturers of audio amplifiers have been offering so called DC amplifi ers to demanding audiophiles The choice of DC as a name for this new type of audio amplifier is perhaps unfortunate In earlier days that abbreviation at least as B 0 VOLTS OC FIG 1 CAPACITOR COUPLED OUTPUT stage is shown a DC amplifier output stege elimi nates coupling capacitor by using a dual power supply and complimentary NPN and PNP out put transistors it applied to audio equipment meant direct coupled The transition from capacitor coupled output circuitry Fig 1 a to audio out put stages that could be connected direct ly to the loudspeaker load Fig 1 b was made relatively simple by using suitable complementary NPN and PNP high powered output transistors and dual polarity power supplies By establishing a 0 DC volts condition at the junction of the two output transistors it was possible relatively new amplifiers work LEN FELDMAN CONTRIBUTING HI FI E
313. tch functions for the rally enthusiast are easy and fun to build And you have the quality and dependability in custom car accessories you can show off with pride Now you can choose one of these fine car clocks a windshield wiper delay a deluxe mobile siren and P A system an ultra sonic intrusion alarm an electronic speed control or a cab to camper intercomm all in money saving kit form you can gt build service and install yourself Super Coinshooter The GD 1190 is 5 finest metal locator with adjustable discrimination and push button tuning that rejects junk and gt finds coins 3 Low Cost Security with this Heathkit GD 600 Photoelectric Lamp Switch Turns your lamp on at dusk off at daylight for that lived in look when you re away from home Learn To Service and Maintain Your Car s Electrical System with this newest Heathkit Automotive Electrical Continuing Education Program Think of the money you ll save when you really understand how your car s elec trical system works and how you can service it This 4 part self learning program takes you through electrical principles starting and charging systems and accessories and body electrical all at your own pace and at lowest cost For Treasure Hunters n The Heathkit GD 348 finds buried metal objects with it s sophisticated induction balance system The tone from the built in speaker grows louder as you pin point
314. th Company Dept 020 550 City Benton Harbor Michigan 49022 CIRCLE 100 ON FREE INFORMATION CARD State CL 704 _ _ 6 6L AINE RADIO ELECTRONICS ory EDT aes 1 Lau LI I 2 1 om ae i k E gt ER Be aware of intermittents they cause some strange symptoms EVER SINCE TECHNICIANS GOT INTO THE servlce business they have been plagued by problems Probably the most annoying is the intermittent Anyone who claims never to have had any trouble with an intermittent just opened the shop that morning and hasn t had any business yet Over the years I have tried to find and identify as many types of intermittents as possible via reports from the field and bring them to your attention As we all know there are quite a few of them that are chronic This means that the same symptom shows up in several chassis of a given make and model And I m sure you can all think of some dandy examples ve just heard of a new one that sounds very interesting A friend and fellow technician Leon Caldwell Caldwell TV Mena AR found the identical problem in three sets of the same make and model We therefore felt justified in calling the trouble chronic And since this article was written Leon has found a fourth set Troubles The sympto
315. th nothing connected to jack J5 There should be 0 volt at the output of S19 Connect the output of J1 through a 10K resistor to the output end of 8628 the input of IC607 Set the scope timebase so that half of the triangle wave cuts diagonally across an 8 X 8 centimeter grid Monitor the output at J7 If possible use a dual trace scope so the input and output of the log converter can be ob served simultaneously Plot an 8 X 8 centimeter log function on the face of the scope screen see Fig 18 or use the preplotted transparency mentioned earlier Adjust trimmer resistors R631 R633 R634 and R636 for the best fit of the output at J7 to the plotted log pattern Trimmer R631 adjusts the total range of the log function as evident by the sharpness of the knee Trimmer R633 adjusts the DC offset so that a zero volt input produces a zero volt output Trim mer R634 is used to adjust the overall gain so a 4 volt input produces a 4 volt output Remove the timebase signal and the 10K resistor Turn off the timebase generator Set S16 to SwEEP GEN Set S11 to MANUAL Set R6 to approximately 1 kHz Set S19 to PEAK Set S20 to LINEAR Set R7 for 8 volts P P The signal at J7 should read 4 volts Set R7 for O volt The voltage at J7 should read O Set S20 to Loc Adjust R633 if necessary to keep the voltage reading at J7 at zero Switch 520 to LINEAR The output of J7 should be 4 volts If it is not touc
316. the chairman of the ETA division far educators the Elac tronics Educators Association He holds a BS degree from lowa State University in Electrical Engineering In addition to his work as execulive director of ISCET from 1971 to 1978 he has worked at Gulllver s Des Moines lowa as a service technician at G E in Utica New York and at St Minnesota as a design engineer He is presently also an instructor and depart ment head at lowa State University He is amp member of the lowa Association of Lifelong Learning He is also co author of the ward W Sams publication Study Guide for Associate CET Exams R E 6461 RADIO ELECTRONICS Make Your Own PC Boards Whether you design your own circuits and printed circuit boards or fabricate the boards using patterns published in magazine articles here are some hints that ll help with your next project ARE YOU STILL BUILDING YOUR PROJECTS BY USING THE OLD rats nest type of point to point wiring Are you still reluctant to tackle construction projects when a commercial printed circuit board is not available If the answer to both questions is yes then you seem to lack the skill to make your own PC boards from scratch By now you have certainly discovered the method of photo copying directly from a magazine page and transferring the foil pattern to the board This method makes it easy to form your own boards for the
317. the only calibration standard that we will be using and it is assumed that amplitude calibra tions are not critical for most applica tions Set the scope input to pc Set all trimmer resistors to their ter positions See Fig 16 Turn on power switches 51 and 52 Set R5 to TRIANGLE and 58 to NOT INVERT Set R3 to maximum and R4 to 0 Set S3 to 1 kHz Set S4 to SYMMETRICAL and R1 to its lower position The scope should show a clean triangle wave at about 1 kHz Set R8 to 0 make sure R4 is still at 0 Adjust R232 for zero offset Set R3 to maximum Adjust R227 for 16 volts P P Adjust R240 for zero offset Switch S5 to SQUAREWAVE Adjust R223 for approximately 16 volts P P and R222 for approximate ly zero offset These two controls will be readjusted later Switch the scope input to AC Adjust R212 for slight clipping Adjust R2 13 for a symmetrical wave form When the scope is set to AC adjusting R213 will cause the average level of the waveform to shift Symmetry is reached when the positive going and negative going peaks are exactly the same distance from the center line on the scope Adjust R212 for minimum sinewave distortion A sinewave plotted on the face of the scope screen 15 valuable aid in complet Ing this step in the calibration An 8 X 8 cm clear plastic overlay Fig 17 is avail able from Fidelity Sound Naturally if you have access to a harmonic distortion analyzer
318. thern N H visit our retail at 7 Oakland St Amesbury Mass CIRCLE 11 ON FREE INFORMATION CARD i 78 6 i 5676R AA 45dia x1 83 98 5689R 550 87dia x1 98 98 066808 Sub 1 865dia x1 645 1 58 G5677R 2 0 1 06 dia x1 87 208 05687 R 2 0 1 028dia x1 85 1 98 056796 1 20 2 3 1 305d a x1 375 198 05678 4 0 1 308dia x2 28 2 78 BUTTON CELLS Sale 75685R 1 2 05 895dia x 205 58 05683 1 2 15 986 8 XI275 68 56848 1 2 22 1 36 dia x 207 78 15682R 1 2 22 1 36 d a x 308 88 05681R 1 2 22 1 61 dia x 320 98 100 Guaranteed Rechargeable tabs to permit soldering buttons on both ends NEW MAIL ORDER ADDRESS DELIA ELECTRONICS 176 SECOND AVE WALTHAM MASS 02154 TEL 617 388 4705 Burglar Fire Smoke Alarm Catalog Billions of dollars lost annually due to lack of protective warning alarms FREE CATALOG Shows you how to protect your home business and person Wholesale prices Do it yourself Free engineering service Burdex Security Co RE 079 Lincoln Ne 68501 Box 82802 PLANS amp KITS SCANNER users build many useful accesso ries Free kit catalog CAPRI ELECTRONICS Route 1R Canon GA 30520 SAVE 50 Build your own speaker system Write for catalog McGEE RADIO 1901 McGee Kansas City MO 64108 CONSTRUCTION plans for profitable business ideas Catalog 1 00 GARLING 438 N Garfield S
319. tion and activation of Yamaha s special OTS Optimum Tuning System tuning circuit All the less used controls are placed along the bottom edge of the panel These controls include two phone jacks a speaker selector switch eight small rotary knobs and ten push buttons The five pushbuttons on the left select the center meter functions power or signal strength low cut or high cut filtering and a 20 dB audio muting feature Five pushbuttons on the lower right select mono stereo modes interpose an adaptor circuit interruption point choose either of two FM IF modes local or auto local activate or defeat the muting and OTS feature and select FM or AM reception Outermost of the eight remaining rotary con trols handle loudness and balance The loud ness control alters the gain settings by 20 dB is continuously variable introducing loudness compensation as the control is rotated and is entirely independent of the master volume control In using these controls the listener adjusts any program source to life like loud ness levels using the master volume control Then if softer than lifelike levels are desired you simply reduce the setting on the loudness control which then introduces precise loud ness compensation over the available 20 dB range Thus proper loudness is obtained gardless of speaker efficiency room acoustics program source level or any of the other vari ables that usually make conventional ta
320. top use the sleek compact 2010A is powered by 4 C cells not included bringing wide range lab performance to the field when you need it You save either way Your 2010A DMM kit comes complete with easy to tollow assembly instructions all parts including high impact case and test leads You can complete assembly in a single evening However for a slight additional fee Sabtronics will ship your 2010A factory assembled and calibrated at 99 50 it s still an incomparable value Whether you re a professional or hobbyist if quality and accuracy are important and padded prices aren t you should inspect the 2010A DMM for yourself If you re not completely satisfied return it in its original condition within 10 days for a prompt and courteous refund of purchase price Call us with your MasterCharge or Visa order today or simply fill out the convenient order form Making Performance Affordable sabtronics 07 13426 Floyd Circle M S 35 Dallas Texas 75243 Telephone 214 783 0994 Model 2010A Digital Multimeter kit s 69 95 plus 54 001 shipping and handiing each Model 20104 Digital Multimeter Assembled 99 50 plus 54 001 shipping and handling each it AC 115 AC adapter charger s 7 50 each 5 it NB 120 NiCad Battery 5 17 00 set THP 20 Touch and Hold Probe s 18 00 each For delivery in Texas add 5 Sales Tax enclose O check money order for TOTAL 5 or please charge tomy OVisa O M
321. tor IC6 is a standard three terminal unit and D6 is 500 m W or l watt 12 volt Zener diode Circuit assembly Assembling the Cardiotach is straight forward and easy with a printed circuit board Assembly can be done on perfo rated board but it is not recommended because of the numerous circuit connec tions to be made Figure 5 shows the foil pattern of the PC board Figure 6 shows where parts are positioned 90 70 50 NNN NS 17 130 NM ul The PC board is designed to be versa tile It can be left at its full size of 7 X 3 inches or cut into two boards 5 X 3 inches and 2 X 3 inches The larger size is designed to fit into an enclosure that has built in PC board slots to hold the board I used the case manufactured by Tracewell Enclosures Inc described in the Parts List but any enclosure that can accommodate the PC boards and transformer should work all right Begin by installing the two jumpers located near the middle of the board so you won t forget them The remainder of the components can be installed in any order you prefer IC sockets are optional but a good idea Make sure to install all diodes capacitors etc with the proper polarity A dot on the PC board is adja cent to pin of the IC s and the positive end of all polarized capacitors If you use the full sized board also install short jumpers from positive to positive to from negative to negative to and the groun
322. treet Lombard IL 60148 PRINTED circuit boards from your sketch or artwork Affordable prices Also fun kit projects Free details DANOCINTHS INC 261 West land MI 48185 OUT smart burglar makes your home look lived in even when on vacation Plans include circuit diagram description printed circuit board pat tern Rush 4 65 to DANOCINTHS INC Box 261 Westland MI 48185 _ _ _ _ TELEPHONE plans Answerer hold button dial ers speakerphone eleven more All for 6 00 110 NE555 projects Freq cap meters dual trac er triggered sweep electronic ignition alarms more All for 6 00 GILDER 2022 79th Brook lyn NY 11214 CHARGE Build your own negative ion generator and save Plans 5 00 LUNATRIX Box 891 Yucalpa CA 92399 MECHANICALLY INCLINED INDIVIDUALS Assemble electronic devices in your home Be your own boss Get started in spare time Little experience Knowiedge or Investment Necessary Expect big prof its 300 600 Wk Possible Write for free literature telling how ELECTRONIC DEVELOPMENT LAB Box 1560R Pineltas Park FL 33565 PICTURE TUBE MACHINE We buy and sell NEW and USED CRT rebuilding machinery COMPLETE TRAINING Buy with CONFIDENCE from the ORIGINAL 1 For complete details send name address zip to LAKESIDE INDUSTRIES 4071 N Elston Avenue Chicago III 60
323. tronics naturally seems easier more understandable Now these unique training aids bring you friendly over the shoulder hands on as if had expert right beside you All planned and prepared in our effective Easi Way M teaching styie Only face to face instruction could be more personal Nothing else like these anywhere j xe a E i J 208 EET x g s 7 4 j 4 E E d gt 1 n g RPTE Two Forest Belt s Service Training MONOGRAPHS TRIGGERED OSCILLOSCOPES Four Hours to Familiarity Easi Way M Solutions for Electronics Math and Formulas Sit down in front of your triggered scope 30 minutes a Spend a half hour each day with your inexpensive sci day and go through carefully organized exercises In entific calculator many models under 40 Learn less than two weeks you can truly UNDERSTAND how quickly to solve electronic formulas without knowing your scope displays signal waveforms where to set algebra Thorough Easi ReadT M explanations ptus the knobs and switches what waveshapes mean what dozens of planned examples and exercises for you to to do when you can t seem to get a display on your work yourself Shows you how to deal with Ohm s Law scope End up feeling comfortable and self assured Kirchhoff s Laws series and parallel circults reac with any triggered oscilloscope tance impedance resonance dec
324. ts with PC Board Power supply 16V DC not included Power band with 1 388 Voltage gain 20Hz 20KHz Super Buy Only 18 50 SW AUDIO AMP KIT 2 LM 380 with Volume Control Power Supply 6 1807 DC ONLY 6 00 EACH WE FOUND THE CASE FOR THE FM MIC Small nice loOking aluminum case size like pack 91 cigarettes 1t 15 intercom Audio amp inside a with a mic jack mini toggle sw on top can be used for many projects We give you the circuit gt data as well VERY SPECIAL PRICE 2 for 4 99 Sub Mini Size r CONDENSER MICROPHONE FET Transistor Built in 52 50 each ELECTRONIC ALARM SIREN COMPLETE UNIT Ideal 1C use as an Alarm Unit or nookup 9 your car back up to make a reverse indicator Light Output up 130dB Voltage Supply 6 12V 7 50 v 0l 9 1 25 e 12 53 00 LINEAR SLIDE 500K SINGLE Metal Case 3 Long 2 FOR 1 20 Recnargeable NI CD Batteries Pak total of 7 2V 450MA output 5 25 PER PACK BATTERY POWERED FLUORESCENT LANTERN FEATURES Circuitry designed ior operation by high etficient high power silicon transistor which enable illumination Maintain in a standard level even the battery supply drops 10 certain Tow voltage 9 BW cool dayligh miniature ffoures cent tube x 15V UM 1 size D dry cell battery Easy sliding door Changing batteries 10 50 EACH Stainless reflector with
325. uad 80 Bit Static 2 95 oh on E 60 M MPUTER CASSETTES 08255 SOCKET Meets 85232 53 50 29 State a 328115 4096 Bipolar 19 95 EACH 15 MINUTE HIGH DB51226 1 Cable Cover for 08250 or 08255 1 75 4X4 Register Fie TriState WP Bo M QUALITY C 15 CASSETTES PRINTED CIRCUIT EDGE CARD 74188 256 TTL Open Collector 3 95 PLASTIC CASE INCLUDED 5 1013 30K BAUD 5 95 745287 1024 Static 2 95 12 CASSETTE CAPACITY 156 Spacng Tin Double Read Bitusacted Contacts Fits 054 to 070 P C Cards 15 30 PINS Solder Eyelet 1 95 18 36 PINS Solder Eyelet 2 49 22 44 PINS Soider Eyetet 2 95 90 100 100 Spacing PINS Wire Wrap 6 95 50 100 125 Spacing PINS Wire Wrap R681 1 6 95 4 Digit Clock Kit Bright 357 ht red display Sequential flashing colon 12 or 24 hour operation Extruded aluminum case black ADOITIONAL CASSETTES AVAILABLE C 15 2 95 ea het 4 sm CAS 6 Dum T eI 14 95 TOP Case and 6 Cassettes SUP MOD II UHF Channel 33 TV Interface Unit Kit Wide Band B W or Color System e Converts TV to Video Displav for CONTINENTAL SPECIALTIES Proto Board 203 A total fesdY 10 ute power bieathagsrd protatesi device with a built in regulated short paot power supply Juu plug in and start buldingt 2 extra Sway binding post io external Seit con lained with powe switch indicator la
326. uring critical lis tening tests Each manufacturer will un doubtedly approach the DC design prob lem from his own point of view and it is still up to the consumer to decide which of all these new amplifiers sounds best and reproduces sound that most closely approximates the original live music per formance R E _ _ __ _ 6 61 D V jessas CIRCLE 106 ON FREE INFORMATION CARD SENSIBLY ORGANIZED ELEGANTLY STYLED and sleekly proportioned front panel is what impresses you first about Yamaha s 1979 1980 top of the line receiver the mode CR 2040 The receiver is housed in an ebony wood grained cabinet included in the retail price A horizontally oriented mid section of the front panel shown in Fig protrudes slightly for a three dimensional effect and contains a square shaped POWER switch three VU me ters a recording output selector switch input and phono selector switches a master volume control and a tuning knob The center meter serves a dual function It acts as a signal strength meter or as a power output meter for the right hand channel its companion meter on the left which indicates left channel power in watts The meter on the right is used for FM center channel tuning The fully independent RECORD SELECTOR and INPUT
327. us print names and addresses from your mailing list ELF II Assembler translates assembly language programs into hexidecimal machine code lor ELF II use The Assembler features mnemamc abbreviations rather than numerics so that the instructrons on your programs are easier 10 read this 15 a big help in catching errors ELF 15 Disassembler takes machine code programs and produces assembly language source listings This helps you understand the programs you are working with improve them when required The new ELF II Video Display Board lets you generate a sharp professional 32 or B4 character by 16 line upper and lower case display on your TV screen or video monitor dramatically improving your unexpanded 99 95 ELF II When you get into longer programs the Video Display Board ts a reat blessing Ask Not What Your Computer Can Do But WHAT CAN IT 00 FOR YOU Don t be trapped into buying an expensive dinosaur simply because you can afford it ELF is more advanced and more fun to use than big name computers that cost a lot more money With ELF tl you learn to write and run your own programs You re not just keypunch operator No matter what your interests ELF I is the fastest way to get into computers Order from the coupon below PHONE ORDERS ACCEPTED Call 203 354 9375 Total Enclosed Conn res add tax CHARGE IT Exp Dale visa Master Charge Bank Account intei Hans and sys
328. ut filters See Fig 10 Fair COMPONENT MATCHING MEASUREMENTS Input sensitivity phono 1 phono 2 referenced to 1 watt or 0 5 volt output mV 0 19 7 6 VV Input sensitivity high level referenced to 1 watt or 0 5 volt output mV 12 0 Output level tape outputs at rated output mV 120 Output level headphone jack at rated output mV or mW N A EVALUATION OF CONTROLS CONSTRUCTION AND DESIGN Adequacy of program source and monitor switching Excellent Adequacy of input facilities Excellent Front panel layout Superb Action of controls and switches Very good Design and construction Excellent Ease of servicing Good OVERALL AMPLIFIER PERFORMANCE RATING Excellent capacitors have a 2 tolerance The extra head amplifier stage uses an additional low noise IC for the required additional gain The entire power amplifier is direct current direct coupled It contains three stages the first consists of a current mirror differential amplifier the second is a Darlington connect ed constant current loaded predriver stage and the third the output comprises three stage Darlington connected complementary push pull stages FM measurements Table 1 summarizes measurements made for the FM tuner Aside from the fact that the tuner did not quite meet its monophonic usable sensitivity specifications of minor im portance all remaining measurements were as good or considerably better than claimed Because our test equipment is not able to measure a
329. utput should be approximately 8 volts This is simply a functional check Trimmers R206 and R209 will be fine tuned later Sweep generator calibration Waveforms Most of the circuitry is identical to that used in the timebase section and the same calibration proce dure applies The output levels and sym metry proceeds from the output J4 back That 15 set R7 to zero and adjust R534 for 0 volts DC level Now set R7 to maximum 513 to NOT BLANK and adjust the trimmers between oscillator 1 502 and switch S14 The only difference in this area is that R513 must be adjusted whereas its counterpart in the timebase is fixed Interaction between R510 and R513 is rather subtle It is not enough to adjust each independently for minimum distor tion Often by actually increasing the distortion with one of these pots re adiustment of the other pot results in lower distortion The optimum calibration procedure re quires a harmonic distortion analyzer and a dual trace scope First a sinewave is 511 R512 522 R519 R403 R401 213 214 221 d i P d p 620 R625 R622 R634 R633 R520 FIG 16 VIEW OF THE BACK SIDE OF THE PC BOARD showing the locations of the fuses a couple of large capacitors and most important of all the locations of the trimmer capacitors and trimmer resistors Their placement simplifies calibration mathematically plotted on the face o
330. very dollar to people who need it That means less than 11 goes for administrative costs So it doesn t waste your money And because United Way is re created each year with a combination of old and new volunteers it doesn t become over encumbered with huge staffs of people who might actually get in the way of progress So it doesn t strangle you in red tape All of which means that because of what United Way doesn do it can do a much better job at what it does do Helping e United Way Thanks to um works For ali of us m 5 kanwa W Magers Pr Sore waq More information on new lit is available from the manufacturers of items identified by a Free Infor mation number Use the Free In formation Card inside the back cover of this issue COMPUTER GUIDE Getting Started with Com puters lists 25 resources books and periodicals to help the personal computer owner learn about his system It ls designed for the novice as well as experienced programmers and electronics engi neers with separate sections devoted to each level of proficiency The booklet also includes an up to date buyers guide and surveys and recom mends computer systems tailored to individual needs NCE CompuMart Inc P O Box 8610 Ann Arbor MI 48107 CIRCLE 141 ON FREE INFORMATION CARD ELECTRONIC PRODUCTS CATALOG contains 48 pages of new and useful electronic products components and equipment all
331. wide angle in MODEL 888 A creasing lumination Of Ihe tantern VVVVVVVVVVVVVVVVVVVYV Kit includes STK 015 Hybrid iC power supply with SOUND ACTIVATED SWITCH All parts cO on a SCR will turn on eelay buzzer trigger other i tor 2 f aciiusiabtej 1681 for use as aor alat sound cOntrOlle t Toys anti m p gt E t i1 TS 6AA NI CD in a flat pack gives you a LIQUID CRYSTAL DISPLAY Overall size 2 x 1 2 0 5 characters reflective type Uses STK O15 Hybrid Power Amp meter 4 digits Model 739 03 for panel meter 3 digits with sign and over ranqe indicator PROFESSIONAL CASE for our Power Supply It IS 8 nice looking metal cast case with giant 4 volt amp meter Output blinding post and fuse holder on off switch and line cord ONLY 21 50 EA VP APT AP EEL LT B8B LLL S a Recs 4 739 03 displays include zeber connectors and front bezel With data sheets Your choice any model 7 50 EACH FLUORESCENT Len 4 12V POWERED Lights up 8 15 Wart Fiuorescen Light Tubes Ideal for camper outdoor Auto or Boat CASE 030 POWER SUPPLY KIT 0 30V D C REGULATED Uses 723 and ZN3055 Power TR output can be adjusted from 0 30V 2 AMP Complete with PC board and all electronic parts 0 30 POWER SUPPLY 10 50 each Transformer for Power Supply 2AMP 24V x 2 8 50
332. within one year if paid in advance All copy subject to publisher s approval Advertisements using P O Box address will not be accepted until advertiser supplies publisher with permanent address and phone number Copy to be in our hands on the 26th of the third month preceding the date of the issue i e August issue closes May 26 When normal closing date falls on Saturday Sunday or a holiday issue closes on preceding working day FOR SALE FREE catalog anglais IC s semi s CORONET ELECTRONICS 649A Notre Dame W Montreal Que Canada H3C 1H8 US inquiries RADIO amp TV tubes 36 each One year guaran teed Plus many unusual electronic bargains Free catalog CORNELL 4217 E University San Diego Calif 92105 TEST equipment catalog listing used Tektronix HP and GR equipment at bargain prices Price 1 00 refundable with first order PTI Box 8699 White Bear Lake MN 55110 NAME brand test equipment Guaranteed dis counts up to 50 Free catalog SALEN ELEC TRONICS Box 82 M Skokie IL 60077 FREE catalog of new merchandise at great prices IC s semi s and more KEY ELECTRON ICS Box 3506 RE Schenectady NY 12303 PRINTED circuit boards reasonable Also art work prototypes designs fabrication and test ing MICROCON INC Box 43 Glenview IL 60025 PRINTED circuit boards 1 1000 Your artwork positive negative or magazine example Quick delivery reasonable prices quantity discount
333. x TEMPERATURE 0 50 C r E L Especially if you re replacing semi conductors Even then you may never read all ol this 416 page catalog but you ll find yourself referring to it every day This year s edition is expanded to give you quick amp easy cross reference data on high voltage triplers more parts identification charts application charts for an instant view of transistor specifications As before our unique parts ID num bering system which no one else in the RADIO ELECTRONICS j GE HAS PUDLISHED SEQUEL TO YOUR FAVORITE DOOK industry offers tells you at a glance almost all you need to know when making a replacement For instance GE5ZDJ 3 stands for a 5 watt 3 3 volt zener diode by General Electric Simple enough For your free copy of this valuable addition to your service shelf see your authorized GE distributor today This could be the best book you ll never stop reading this year WE RE AT YOUR SERVKE Tube Products Department Owensboro Kentucky 42301 GENERAL 68 ELECTRIC UU SS Sits 9 75 Go aw gt EP An instantenous check on heart rate activity is essential when engaging in meditation Yoga or an exercise program for health and physical fitness This cardiotach provides a direct readout of your heart rate MARK C WORLEY THE CARDIOTACH IS AN ADVANCED SOLI
334. y ger 52 Q5 comp 5 15 Reo 318 00 Tool Kit Tool Cases 8 269 95 Model 99SM MOOEL 10057 p WP Function ul aot Roll Kit Generator t e Automatic and line sync modes 42 95 Power consumgtian less than 15 W _ NOW AVAILABLE 663 with probes with 2 1 v Model MS 215 Rea 5435 00 Pallets 6007 65 00 PRECISION ub In Dash AM FM 8 e Add subrraci modes CH 1 amp CH2 Reg 769 95 e Compact powered e Front panei X operation 654 50 gt eo x 56 sim Stereo ia 56 C E 50 M 2910 Check our prices REL Precision graund and polished POCKET CRICKET TRANSISTOR FET TESTER Reg 125 00 99 95 40 Portable ae Boose 40 Watt IVOM Multimeters gt Frequency wer POW 40 539 5624 95 20K ohm v 19 95 germ Call TOLL FREE magnification leas Jses 22W 1 9 Circline Hucrescent For N Y State aie Cassette 800 645 9518 252 0080 _ CAS 888 MasterCharge Bank Americard Stereo e COD Check Money Order Add 3 00 for shipping and insurance C O D s Extra New York State VISA resident
335. y slide loggle etl 295 oye 1 29 B 1 35 SALE 12 for 1 30 60 COILS AND CHOKES rf parasitic if 2297 eee eee eee 1 29 2 LASER DIODES Order by Cat No 60 TERMINAL STRIPS up to 4 solder 5 7 334 lo eee nnne 1 29 120for 1 QG amm m 25 PLASTIC TRANSISTORS untested and hobby 92 18 2 26044 1 29 50 I m 1708 TOPHAT RED Jj m5o0 MICA CAPACITORS asst 2373 m Rn 1 29 100 1 B 50 CAPACITORS asst values 373 4 e IM Rated 5 9 White 1802 MICRO SINGLL PIN RED 10 SETS RCA PLUGS AND JACKS phono 402 e ur Noe 99 2135 JUMBO 60 DISC CAPACITORS asst values Ing leeds 437 UA MEME S HB n 20 TRANSISTOR ELECTRO S asst up and X 453 ANLE UMEN r1 Pe JUMBO RED CLEAR 75 HALF WATTERS resistors color coded asst 6454 2 eee ee eee 1 29 150 for 1 30 Cat No 92543508 T m 35 SILVER MICAS red backs axial 455 2455 1 29 70 for 1 30 4 PUSH BUTTON SPST PANEL 125V 1 5289 1 29 1 30 100 GERMANIUM DIODES axial leads u 2642 o 1 29 200 for 1 30 Sa SED B 100 STABISTORS Regulalor sensing and computer Axial ex yield z 3140 or 1 100 PRINTED CIRCUIT WATT RESIS
336. your find or you can use the front panel meter or optional headphones Learn How To Use Electronic Test Instruments with this new Heathkit self learning program progressive 4 part program using Heath s famous programmed instruction with audio and visual aids for maximum efficiency Learn to use electronic meters oscilloscopes fre quency generators and special measuring instruments Build Your Own Custom Stereo And Get Heath Quality Plus System Savings Choose from Heath s complete line of quality audio products for the kind of custom sound reproduction you want from the newest and finest professional rack mounted components to a full range of super value com ponents including receivers tuners amplifiers pre amps custom control systems speakers and name brand turntables and cartridges all available individually at low catalog prices or at money saving system discounts Radio Control Gear You Can Depend On From the leader in R C development See this new 8 chan nel open gimbal transmitter with Heath s instant plug in frequency change feature all Heath firsts plus sensa tional savings on complete systems and R C Starter Sets Every Heathkit product is backed by world famous technical service and counsel plus sales and service facilities at 54 Heathkit Electronic Centers coast to coast units of Schlumberger Products Corporation See the white pages of your phone directory for the center
337. ysis are fine in their place which is the laboratory But you listen to music in your home and we re confident that you will hear the difference in musical clarity that a Sansui amplifier makes Your local Sansui authorized dealer can demonstrate all the Convincing reasons for choosing Sansui SANSUI ELECTRONICS CORP Lyndhurst New Jersey 07071 Gardena 90247 Sansui Electric Ltd Tokyo Japan Sansui Audio Europe S A Antwerp Belgium In Canada Electronic Distributors TIM DISTORTION I I POWER IW 1 zi 3 4 5 10 20 50 100 OSE CIRCLE 68 ON FREE INFORMATION CARD 9 RADIO ELECTRONICS h PE pm 2 2 80 ms editorial ERAS s 19 X m 28 O l M f A Call For New Ideas Every magazine has an editorial policy It provides the guidance that determines the subject matter that is covered on a monthly basis The editorial policy of Radio Electronics is quite basic We sum it up in one sentence and place it on the front cover each and every month right below our logo It reads The Magazine for New Ideas in Electronics Simple Sure but oh how difficult to achieve IL means that we maintain contact with the engineering departments of the semiconductor houses research labs key manufacturers as well as various Industry sources We go right to the source then sift out the best ideas

Rad io - American Radio History

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