Memorex CP8 TURBO UNIVERSAL REMOTE CONTROL User Manual

48784 $2.50 U.S. $2 95 CANADA AUGUST 1988 THE MAGAZINE FOR THE ELECTRONICS ACTIVIST! The Electronic Bandit Slot machine fun at home! 5 Classic An

8 DEN Car Stereo Speaker Systems Ultimate Sound has unleashed its up- dated Turbo line of self- contained car - speaker systems. The Turbo line is de

We stock the exact parts, PC board and AC adaptor for Radio Electronics February 1984 article on building your own Cable TV Descrambler. #701 PARTS P

Only NRI gives you a 27" high -resolution stereo color TV you build to prepare you for today's video servicing careers. You Build a 27"

12 NEW PRODUCTS The unit provides indications for logic high, low, and even pulsing inputs. For pulses with repetition rates over eight hertz, the un

The Memorex Video Cleaning Sys- tem ($14.99) is a non -abrasive, wet, cleaning cassette that thoroughly cleans the entire tape path and all tap

14 NEW PRODUCTS r075 <WNW MO b. =12 _,__ _ - -- - 2 3 - --- CIRCLE 46 ON FREE INFORMATION CARD like it was factory installed. It also pro-

Modern Classic Radio In 1932, the typical table radio had a wooden cabinet, weighed 40 pounds, consumed 100 watts of electricity, re- quired a 50 -f

16 DMR -45 412 Digit Ruggedized Multimeter 30 Position Rotary with 5" High Contrast LCD. Auto -Overrange and Auto Polar - ity Diode and T

with more than one application at one time; bypass cumbersome menues with "fast command" shortcuts; produce dazzling two- and three- dim

18 CIRCLE 5 ON FREE INFORMATION CARD AMAZING SCIENTIFIC & ELECTRONIC PRODUCTS PLANS -Build Yourself -Ali Parts Available In Stoc LC7- BURNING

CIE MAKES THE WORLD OF ELECTRONICS YOURS. Today's world is the world of elec- tronics. But to be a part of it, you need the right kind of trainin

________ _ _____ ___ _ _-_ __._ C O R P O R A T I O N 2402 al 2 4800 TTl 4.1 1418144 1454. al s404M. 4000 C05 CM05 Yí± A 401. 40. IF, get:0

22 BOOKSHELF rays and pointers, using character strings, data structures, files and other I/O, and graphics, introduction to struc- tured programming

IC User's Casebook By Joseph J. Carr Just published by Howard W. Sams, the book covers linear and digital de- vices, timers, and general dev

26 1 85 185 190 2.45 3.95 4 49 1295 1495 1995 125Ons1 49 1200na1 89 115Ons1 99 1120ns1 1.49 1200ns1 6.95 1150..s1 1 79 1120ns1 1.99 1200ns1 1.95 1

100 UP 09 12 12 09 09. 3 VOLT LITHIUM BATTERY $1.95 `HOLDER *1.49 . ' 4 CAPACITORS TANTALUM 1.0,4 15V 12 10..' 35V 45 6.8 15V 42 2 2

28 FREE! New Catalog of Hard-To-Find Precision Tools Jensen's new catalog is jam -packed with more than 2,000 quality items. Your single source f

dBase III Plus Workbook and Disk dBASE III PLUS TMSD By Michael J. Clifford see Learning to use dBASE III Plus is now easier. dBASE III Plus

30 COMPUTERIZED CASINO All the thrills and excitement of the tables of Reno, Las Vegas, and Atlantic City -but without some of the consequences By Wa

is that the circuit has been complicated by the use of a lot of standard chips instead of simplified with a computer circuit and program. It all

32 12V DC SOURCE C14I 100T +5V Fl i Si ROLL" 1118 7805 1G Cl 100 C8 , C9 C10 C5 1 U3 C04017 13 15 4 12 10 U5c 2 11 R30 101( 1/3 C04075 4 U5b 13

1/4 C04071 R2 47051 R1 1E01 J/ LED2 J/f E^fJ, 10 1/4 CD4081 10 12 13 U16c 11 1/4 CD4081 0 3 21 22 U 10 C 0407 U11 CD4063 R25 10K 12 23 4 5 14 11 9

30 44 65 70 75 39 58 60 62 79 78 85 86 88 90 92 2 4 8 16 37 47 71 INCLUDING GIZMO 11-PAGE IC Volume 5, No. 8 AUGUST 1988 CONSTRUCTION Build the Compu

34 H ,y W Q J J O 2 d o- N J J O CC d N 4 J 2 q d I I I I I I I I I I I I I I h -ANY NUMBER OF ROLLS -1 O7 I I 1 1 I I- 1 I I I I I 1 0 -I-I

Fig. 3 -The author's prototype was built on a double- sided, printed- circuit board -a supplier of which is given in the Parts List. The upp

36 CR-61 0+ Fig. 4 -Once you've obtained the board and collected all the parts shown in the Parts List, begin construction following this gu

Here are your free FactCards! Introducing Hands -On- Electronics" FactCards. Each issue, Hands -On- Electronics" will present 3 new Fac

79 awr Fact Card LF441. Low Po JFET Op -Awer mp DC ELECTRICAL CHARACTERISTICS Ctarsebristie Conditions LF441A Typ LF441 Typ Units Input Offset Voltag

50 YEARS of CAR ANTENNAS With the recent changes in music reproduction, almost everyone today is into high -tech car audio. What most don't real

40 antenna system presented a dual challenge, both to the engi- neer, who had to find a suitable solution to the all -steel top automobile, and

Fig. 7 -Here we show three European versions of 1939 retractable antennas from Telefunken. The tiltable -rod (controled from inside) is shown in

42 Fig. 9- In 1940, Philco and Zenith supplied Ford with car radios that had the antenna rod coming straight through the roof and plugged into t

windshield would reduce visibility, Pontiac management bought the concept and the windshield antenna was intro- duced in production shortly a

2 The Magazine for the Electronics Activist! Used computers have no tires to kick! It had to happen sooner or later! They sell used cars, us

44 All the fun and excitement that Reno, Las Vegas, or Atlantic City have to offer without fore -going the comforts of home BUILD THE ELECTRONIC BANDI

r D2 1N914 C7 100-500 + .. + R1 10K 81 9V R2 22K S2 O O D 1 1N914 R3 4.7K R4 Cl 100K R5 10K R7 10K C4 R8 10^22K C2 U3 R13 R9 10K 4.7K C5 +R14 15^22K

46 Fig. 3 -The author's prototype of the Electronic Bandit was built on a printed- circuit board, with the components surface mounted on the

AUGUST 1988 ELECTRONICS FOR THE MIND & BODY Beeper Plus Sports Page pg. 1 Panasonic Automatic Bread Bakery _ pg. 2 Casio LCD Color TV pg. 3 Te

Games in progress are updated every five minutes. After a recent New York Rangers hockey game, The Sports Page was flashing the results on the lin

the timer, the unit can be set to produce bread at any time within 13 hours of setting its timer. With the Panasonic Bread Bak- ery the user c

.ports, or weather reports while away from the home or office, or a parent who wants to keep the kid quiet in the back seat on a long drive. En rou

that appears on the device) would make a great prop in a sci -fi movie. Its potential, however, is a great deal more practical. Encoding number

nia the first time around. Sure, we were aware of it, but having spent our teen years fascinated by pinball machines, we weren't part of the

Panasonic Electronic Typewriter flunking about upgrading }our home or school typewriter with an eye on eventually going the PC route? A model th

TROJmISHOO_G 1110 REPAIRING TE E NEM PERSONAL COMPUTERS 2809 $26 95 Count as 2 141yT0$0LD ECTRONIC PROJECTS 1599P $47.85 _rrer-.. 2905 $19.95 1E655

Gizmo /Bytes In- Flight Headphone System Cf-ildren's Humidifier Mini Video Camera Auc iO Cassette Organizer Jetset Stereo Headphone System We&

Gizmo /Bytes Radio Shack Bridge Companion We don't know much about the venerable card favorite, contract bridge, but we're not surprised

Gizmo /Bytes Compact 35mm Cameras Party Par-ner Speakers Ca lister Vacuum Cleaner Universal Remote Control Konica Compact 35mm Camera In years past

Goldstar Mini -Microwave Oven People are eating light and wahhing down -sized microwave oven for h tube? Goldstar Electronics Inter 07071) says i

58 Reader Request: PULSE CODE MODULATION You asked for it and here it is: everything you wanted to know about pulse -code modulation! By Rodney A.

servo is represented by the width of a pulse. Many people think of that as "digital" radio control, but in truth it's more analo

60 ELECTROLUMINESCENT GLOW STRIPS Phosphor displays are interesting and can produce interesting effects. This lighted display background may just be t

This is the voltage inverter. Small pieces of metal tubing have been placed over wire terminals to improve their visibility. Be sure that all

Using Comparators to Detect and Measure Discover how to use op -amps to monitor real -world conditions OUTPUT 3 OUTPUT 4 GND INPUT 4+ INPUT 4- INPUT 3

Vref B TIME. Fig. 3 -The charted relationship between the comparator's input and output vol ages is shown here. The upper graph (A) shows inpu

4 LJLJ D Bands -on Electronics, 500B Bi- County Boulevard, Farmingdale, New York 11735 Haves and Needs Each month we get a lot of requests for sche

64 How Much Feedback? he feedback resistor (R6 in Fig. 5) is usually chosen to be much larger than the input resistor (R5). Its precise value isn

CAR STEREO IN YOUR HOME* By Greg Swain Adapt that orphaned car radio -cassette player for in -home use THOSE OLD VACUUM -"lUBE SE :S SURE IIA

66 They often also have a built -in cassette player, bass and treble controls, and a power output of several watts per channel or more. Fina

0 o O o Fig. 2 -The printed circuit board for the In -Home Car Radio power supply is shown here for those who prefer the convenience of PCB constr

68 transformer, are mounted on a small printed- circuit board measuring about 4.5 by 2.5 inches. The parts can be mounted in any order, but b

The power transformer should be mounted in the cabinet with the mains terminals facing inward. Before doing that, however, solder two short len

LOW -BATTERY ALARM Free yourself from dead -battery hassles with a circuit that monitors the voltage of your back -up batteries and tells you when the

Fig. 1- Battery voltage is monitored by U1. When the voltage drops to below the threshold value, U2 begins to oscillate, turning on buzzer BZ1. on

74 Two wires are soldered to the battery contacts to connect the batteries to the alarm circuit. The pack is snapped back into place and the wires

BUILD THE Route out RF interferance, evesdropping, and more with a handheld RF detector By Charles D. Rakes ELECTRONIC "BUG" SWATTER IS IT

The Electronic Industries Association /Consumer Electronics Group has recently completed the first in a series of videocassette training tapes. EIAIC

78 By Marc Saxon EIN- ON SCANNERS "Betcha" don't see scanners like this everyday You DON'T SEE TOO MANY HAND - held scanners t

THE MATH OF CAPACITORS By Louis E. Frenzel You can't design with capacitors unless you know exactly what they are capable of in mathematical term

e 82 v=12(1.12) Now, subtract .12 from I to get .88. Finally, multiply the source voltage by the above value to get the capacitor voltage: v =12(.88)

The capacitor will charge or discharge when a pulse is applied to it. The exact operation of the circuit really depends upon two key factors, t

84 zero pulse -generator output is equivalent to a short across the generator input. Referring back to Fig. 9, you can see that that effectively plac

s can exchange up to twice the data in half the time Class 5 modem By Herb Friedman L ON COMPUTERS [JTIME!...PAR FICULARLY WHERE IT concerns personal

86 By Don Jensen Iv ON OWING Guiana...Guinea -Not sound -alikes, but similar enough to cause confusion GUIANA- ACTUALLY THERE ARE three of them -is

which is the western half of New Guinea. At the right time of year- September and October are good times to try-and under favorable conditions

ON ANTIQUE 88 By Marc Ellis RADIO Restoring A Zenith Shutter -Dial Set JUDGING FROM THE VOLUME OF reader mail received, the columns deal- ing with t

91 eager FactCard ALF444A°uad Low- 41 .Power Op-Amp DC ELECTRICAL CHARACTERISTICS I teristiC TYP LF444 TYP Units I Input Offset Voltage Vus Rs- 10

6 LETTERBOX In fairness, however, there appears to be some problems with instruction clarity. We were concerned enough about it to do a survey

Here are your free FactCards! Introducing Hands -On- -Electronics FactCards. Each issue, Hands -On- ElectronicsA will present 3 =new FactCards, eac

seven -tube circuit includes a 6A8 os- cillator- mixer, a 6K7 IF amplifier, a 6H6 diode detector, a 6F5 first audio amplifier, and a 6F6

90 By Joseph J. Carr, K4IPV [11 ON HAM RADIO Resurrecting the old fa the l t alterna LOOKING AROUND MY NEIGH - borhood might lead one to conclude

ROPE RADIATOR 468 Lh fMHz HOUSE END INSULATOR CENTER INSULATOR OR BALUN 75 -S2 COAX RADIATOR AS CLOSE R z PE TO 90 -DEG. AS POSSIBLE END INSULATOR T

By Charles D. Rakes Get your shopping list ready for this month's supermarket of electronics circuits GET READY FOR A WORKOUT, CAUSE this mont

potential is applied to the anode of DI, forward biasing that unit and causing it to conduct. While that action is going on at the upper termin

S1 B1 ¡ +3V R2 5K D1 2N2222 R1 270L, TO POS. 1 +1 TERMINAL OF PROTECTED CIRCUIT TO NEG 1 1 TERMINAL OF PROTECTED CIRCUIT Fig. 5 -The current limi

The switching circuit in Fig. 8 steers a single audio signal to a choice of two outputs. When a positive voltage is ap- plied to the anode o

96 PULSE -CODE MODULATION TABLE 2 -PPM CONVERSION CHART (Continued from page 59) represents it's amplitude at some specific point in time. For

This will be coming to you when you subscribe to Radio -Electronics HELPFUL CONSTRUCTION ARTICLES... Test Equipment Hi -Fi Accessories Telephone Acces

rum for the exchange of electronics ideas, whether these ideas be in the form of short letters, like the one from B.P., or in the form of full

THYRISTORS POLARITY TESTER HEADPHONE INTERFACE RAD HOUND IF YOU'RE THE KIND OF READER that doesn't want to wait, you can order your n

BOOKSHELF (Continued from page 29) How to Read Electronic Circuit Diagrams --2nd Ed. By Robert M. Brown, Paul Lawrence & James A. Whitson For

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104 HANDS -ON MARKETPLACE FOR SALE STRANGE stuff, complete items, plans. kits. Laser eavesdropping, hidden weapons, bugging and counter -measure

PLANS /KITS BULD this five -digit panel meter and square wave ' generator including an ohms, capacitance and fre- quency meter. Detailed i

106 E -Z MATH (Continued from page 84) To be really useful, the integrator time constant must be very long compared to the input pulse on and o

EIA/CEG AUGMENTS DIGITAL AND MICROPROCESSOR COURSE HIGH TECH PARTS KITS NOW AVAILABLE The members of the Electronic Industries Association Con- sum

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