Radio Shack 43-3808A Bedienungsanleitung

uI 1980 EDITION ELECTRON î ELÉECTD ÁT Q Q CORE A PROJECT BUILDER'S BULLSEY Portable Anytime Flasher rim Three -Dial Combo Lock 5 : Equipment Pr

Lab Test Elementary Electronics For Yourself In case you're not all that familiar with us,we're not a publication for electrical engineers

MINI -REG pads for IC1 just right. Push ICI into the drilled board and mark and drill the mounting holes. For easier mating. countersink the lead

should drop to about five volts. If much higher values are observed, current limiting is not taking place. Look for a defective or improperly i

MINI -REG Suppose you are experimenting with a transistorized circuit drawing five milli- amperes at five volts. You would then set S2 to ten

ASK A GROUP of electronics enthu- siasts what the single most difficult part of project building is, and more often than not the reply will be, &quo

Parts Inc. (PO Box 62, E. Lynn, Massachu- setts, 01904). Others, like Poly Paks (PO Box 942, South Lynnfield, Mass., 01940), or Herbach.4 Rad

ADDRESSES OF PARTS SUPPLIERS: Ace Electronics, 5400 Mitchelldale Houston, TX 77092 Active Electronics Sales Corp. 12 Merser Rd., Natick, MA 01701 AL

Parts be very cautious when buying surplus aluminum electrolytic capacitors. They have a limited shelf life, and once they dry out, they are useles

THE SPEiAL Power your projects, spend pennies for parts. by Herb Friedman Between 555 timers, TTL, CMOS, opamps and run of the mill transis

JUi4K loX through the shoulder washer. Secure with a 1/4 -inch (or smaller, not larger) nut hand -tightened against the shoulder washer. Before g

40 Integrated Circuit Projects (Continued from page 86) zero, an illegal voltage level, or the presence of pulses at any frequency or duty cycle.

New Products (Continued from page 7) ged construction assure perform- ance and durability. Available for only $19.95, the BW -2630 can be purchas

New Products (Continued from page /0) trol of the reproduced sound to compensate for room acoustics, limitations of other components, characteris

(!...,ITERATURE LIBRARY 400. Continental Specialties provides new product into in its catalog of Testing and Design Instru- ments. A Digital

...M... Classified MARKET . ... ... . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

ìtlItlt>lt>f' A PLACE NNE Classified i To be included in the next issue, please send order and remittance to R S. Wayner, DAVIS PUBLICA

Ask Hank, He Knows! Got a question or a problem with a project -ask Hank! Please remember that Hank's column is limited to answering specific

Build Faster. Test Easier. THE A P SOLDERLESS WAY. ... ._- ...u Ululi Uv ulivi vvuv. 7J f Y 1 1 J 1 i t i A P Super -Strip with non -corrosive

l SERVICING LESSONS I PRINTED CIRCUITRY 1 ELJdLU 2 e EWRUU F(D ELECTßONJCS DEWS PROGRESSIVE HOME RADIO -T.V. COURSE Now Includes * 12 RECEIVERS * 3

8 YYMAfYt New Products Hand -Held 31 DMM With a choice of either LCD or LED displays, two new VIZ 31/2 digital multimeters provide an accura

IN THIS, THE 1980 EDITION OF 101 ELECTRONIC PROJECTS, we've assembled a truly exciting collection of new cir- cuits for your enjoyment. E

Electronic Projects full data sheets for both the original part and the intended substitute. Compare all important specifications of the two

same conditions. However, simple op -amp feedback ampli- fiers and 555 -type oscillators perform with remarkably little influence from supply pot

Electronic Projects If you decide to keep a project for permanent use after experimenting with it, a fixed -output line- operated supply may be j

Solderless Breadboardin The neat, easy, quick way to go for the experimenter r THERE ARE A LOT OF WAYS to put electronic circuits to- gether, a

Breadboarding package) integrated circuits, are inserted directly into the sockets, and interconnections are accomplished with short lengths of #22

Newfrom NRI! 25"colorTVthat tunes by canputêr, programs an entire evening's entertainment. Just part of NRI's training in servicing TV,

Now get OHIO SCIENTIFIC personal computer products with guaranteed, quick, mail order delivery. ONLY 5279 Ohio Scientific Superboard II The first comp

101 ELECTRONIC PROJECTS 1 Moose Call If "Hey, Bullwinkle" is your idea of a moose call, you're in for a surprise. The little ci

is fed through C4 to a clipper (DI, D2) and FET Q3, which functions as a signal attenuator. How much of a signal passes through the FET

4 Fluid Detector For those of you anticipating the melting of the polar ice caps, we pre- sent a handy device to warn you of the deluge. Many

output consists of 5- volt -high pulses that may he used to drive TTI., CMOS (if a 5 -volt supply is used) or an audio circuit (in which

curacy, make sure that the input resist- than that of the resistor under test. under test should he no larger than 1- megOhm to keep er

' 10 Portable Emergency Flasher For camping or highway emergen- cies, here is a solid -state light flasher that's compact and reliab

provided with a heat sink, which can be the metal cabinet. Build up a marblesize mound of epoxy on the cabinet and insert Q1's

15 Photoflood Dimmer #1 If you dabble in photography, you know that in addition to natural light, there are two other light sources avail- a

18 EVM Timing Adapter If, like many other experimenters, you own an electronic voltmeter - VTVM, FETVM or whatever -you might like to try t

PARTS LIST FOR LOW -POWER DUMMY LOAD RI R3 PI P1 -PL -259 coaxial plug R1 thru R4 -5 -ohm, 2 -watt carbon composition resistors R2 R4 21 The Light

nnovation The sharpest picture ever achieved in big -screen projection TV The new Heathkit Screen Star sets a new standard in picture quality for big-

durations, simply increase the value of Cl or C2. When driven by a low -im- pedance squarewave generator, both circuits are capable of clocki

26 Three -Dial Combination Lock Here's an effective little combination lock that you can put together in one evening's time. To open

located away from the control circuitry -as indicated by the dashed line in the schematic -so that the operation of the control circuit

2N3G55. With either device, unless the equipment you are driving is very low power, use a heat sink. There are two easy ways to deter- mine how

CIE has a terrific idea for a few people who know what they want.

If you want success in electronics ... if you want the skills people are glad to pay for ... find out about CIE training. It's a terrific idea th

33 Multivibrator Tone Hummer This multivibrator produces an audio tone rich in harmonics. If you were to look at the output on an oscillosc

where it can fire the NT' -2 You may not need R3, ',! :t it !in:': amount b of current that I I has to h- ladle. For an int

RI cI T PARTS LIST FOR BLINKING NEON NIGHT LIGHT B1 -9 VDC battery R1- 10,000 -ohm resistor. 1/2 -watt C1- .05 -uF capacitor R2- 100 -ohm resistor C2

ohms -a common minimum value for most recorders. Do not eliminate R3 in an attempt to increase the output level of the filter, because it

101 Electronic Proects 1980 1 Moose Call 20 2 Shaped Output Code Oscillator 20 3 Zener Diode Tester 21 4 Fluid Detector 22 5 Basic NOR Gate 22

42 High Performance Transistor Radio U Here's a neat way to update your crystal set, assuming you can still find it. Or use these few inexpe

you hang the phone up. There is some danger, though, of putting the ` phone on "terminal hold," if you forget. Because as long as

attenuation at 19 kHz and about 25 dB attenuation at 38 kHz. It has vir- tually no effect on the frequency re- sponse below 15 kHz, the

Q1 give you about 7 seconds when you first get into the car to get your- self going and let the idiot lights douse before the buzzer ca

51 Crystal Checker A fast way to see if the crystal from your transmitter or receiver is proper- ly "active" is to compare its out

12V DC + PLI RI PARTS LIST FOR 12 TO 9 FOR TRANSISTORS C1- 0.05 -uF, 400 -VDC capacitor D1 -1 -watt, 9.1 -V Zener diode - HEP -104 (Radio Shac

56 Pro Burglar Alarm 0 Almost without exception, profes- sional burglar alarms are the so- called "supervised" type, meaning a close

58 Latching Burglar Alarm Open a fancy commercial burglar alarm and all you'll find inside is this ordinary relay latching circuit. The

61 Photoflood Dimmer #2 Professional quality photographic lighting requires complete control of the studio lights, and that's just what y

PARTS LIST FOR HIGHWAY NIGHTFALL ALERT D1, D2- diode, 1N914 or equiv. K1 -SPDT relay, 12VDC K2 -SPST relay, 12VDC Q1- Phototransistor, FPT100 or e

1057 -192 p.-All About Telephones (S7 951 65*If COUNT; CS ONE BOOK- , 604 88250E p Useng floc borie Testtra for Autortoliee w Tune -Ue & T

66 Turn -On Delay Turn the switch on and the cir- cuit you're controlling (LOAD) won't turn on until 10 seconds later with this U

overvoltage condition is occurring. In the Breaker position, power is applied to the protected circuit only so long as relay K1 is not ener

71 Balanced Input Mike Preamp fl Once the length of a "single ended" (one shielded wire) microphone cable exceeds 25 -feet, it becomes h

tial. When someone touches the door- knob, hand capacitance "kills" the oscillator, thereby removing that cut- off (holding) bias from

75 Twang -A -Matic It seems no one cares for the sound of a plain, unadorned guitar. First they added fuzz. then big -boom bass, next it was rev

a 2 Volt drop. Using Ohm's Law, E =IXR, or R=E /I -2+1 4 Ohms (you would want to use a 4 or 5 Watt resistor to comfortably handle this

80 Power Tool Torque Control SCR -I PARTS LIST FOR POWER TOOL TORQUE CONTROL D1, D2-IA, 400 PIV silicon rectifier (Calectro K4 -557 or equiv.) F1

v + o 1-5 VDC o RI + LED I R2 + hL ED 2 LED R4 + \ LED 4 R5 + 'LED5 R6 + LED 6 PARTS LIST FOR LED BAR GRAPH DISPLAY D1- 15- Silicon diodes

85 CB Scope Monitor Any scope, from the least to most expensive, with provisions for direct connections to the vertical CRT plates, can be used f

ANT O OUTPUT TO RECEIVER USE COAX PARTS LIST FOR SWL'S LOW BAND CONVERTER B1 -9VDC battery Cl, C4- 470 -pf capacitor C2 -.1 -uF capacitor C

New Products Pocket Shortwave Receiver Measuring only 13/4 x 27/s x 1, the Model EP -8 may be the smallest AM /SW 2 -band receiver. In addi- ti

90 Sensitive Squelch f J The high sensitivity of this circuit is due to the use of a JFET at Ql. With R2 at just 47K, the high impe- dan

age equals or exceeds the preset volt- age, Q1 turns on, driving pilot lamp II on. Resistor R I permits the use of a #47 type lamp

95 AC Adaptor It seems that just about everything these days is battery powered, and when something goes bad and you're ready to check

PARTS LIST FOR LED TELEPHONE RING INDICATOR C1 -.1 -uF capacitor D1, D2, D3, D4- Diode. 1N914 or equiv. LED1 -Light emitting diode R1- 82,000 -o

100 Signal- Operated Switch Li If a VOX is a voice operated switch, is this signal operated switch a SOX? You can take a signal, like the ear

40 INTEGRATED CIRCUIT PROJECTS I . The CMOS Robot Ear [] The CMOS chip type 4047 provides a convenient monostable and astable multivibrator circui

3 IC Audible Logic Probe L] Here is the old familiar logic probe but with a new twist. Instead of displaying logic status with LEDs, it doe

5. Variable Regulated Power Supply 7 These are lots of good power supplies on the market, but why not build your own and save a bundle? This

is the interval between S1's release and the opening of S2. Longer times create higher voltages and cause higher - numbred LEDs to light. For

one is set to minimum. This guarantees a full 1 -volt peak -to -peak output. You might also try feeding some interesting waveforms into the Mu

ITEM NO. CMOS SAFE "7 IC INSERTION/EXTRACTION KIT MOS -1416 14-16 CMOS SAFE INSERTER EX -1 14 -16 EXTRACTOR KIT INCLUDES MOS -2428 24 -28 CMO

PARTS LIST FOR SST FUNCTION GENERATOR Cl, C2- 100 -uF electrolytic capacitor, 35 VDC C3, C4- 0.1 -uF ceramic disc capacitor, 35 VDC C5- 0.001 -uF

PARTS LIST FOR PSEUDO -RANDOM SEQUENCE GENERATOR C1- 0.1 -uF ceramic disc capacitor, 35 VDC C2, C5- 100 -uF electrolytic capacitor, 10 VDC C3 -5

anyone within hearing distance. The output signal has a 1 -volt peak -to -peak maximum amplitude, which is just right for driving the AUX or T

that the LED just goes out. The LED will now become lit if the voltage is outside the permissable range of 13.5 to 15.0 volts when the engin

PARTS LIST FOR REFLEX TESTER D1- 1N4001 diode D2 -small LED IC1 -4001 quad NOR gate Q1- 2N4401 transistor R1, R2- 870,000 -ohm, 1/2-watt resistor R

22. Pennypincher's Frequency Meter One of the handiest instruments you can own is the digital frequency counter, but unless you do an awful l

24. Touch -Activated Combination Lock 4*" Here's an electronic combination lock that's tough to crack. To open the lock, there

26. LED Black Jack The object is to see who can gzt closest to 21 LED flashes without going over. Any number of people can play. Press SI

29. Sawtooth Sounds The Micro- Mini -PA described earlier can put the sound of the unijunction transistor oscillator in the air and demonstrate its

PARTS LIST FOR MINI -MICRO METRONOME C1 -2 to 5 -uF low- leakage mylar or tantalum capacitor, 15 VDC C2 -2.2 to 10 -uF electrolytic capacitor,

r P-R-OJECT YOURSELF Project yourself into a world of electronics fun with these two enterprising books; Weekend Projects For The Radio Amateur,

A To Connect Pins Divide 1&2 of IC2 To By Pin 1 Pin 2 2 Cl Cl 3 C2 Cl 4 C2 C2 5 C2 C3 6 C3 C3 7 C3 C4 8 C4 C4 9 C4 C5 10 C5 C5 5-10V C4 -- C5

36. Multi -Input Music Synthesizer PARTS LIST FOR MULTI -INPUT MUSIC SYNTHESIZER IC1 -4016 quad bilateral switch R1 through R5- 1,000 -ohm, 1 -wat

38. Guitar Tuning Aid By taking advantage of the frequency stability of the 555 timer IC operating in an astable mode, an oscillator can be c

BRE New construcii printed circuit OR THE LAST FEW YEARS, there have r been two major methods of circuir board construction dominating the ho

WI RE- WRAP jects available for the hobbyist to build. One can literally bùild her or his own microcomputer from scratch these days. and th

probe tip into a standard solderless breadboard hole in order to trace a pulse will no doubt appreciate this. The more complex copper -clad board

DESIGNING REGULA TED POWER SUPPLIES You don't have to have a degree to design the power supply you need OP UNTIL A FEW YEARS AGO, the t

supply set to the desired voltage. Meas- ure the current drain with an ammeter in series with one of the power leads. Select a Transformer.

DESIGNING SUPPLIES use 500 -AF if you like. But when the capacitor must have a high working voltage (50 to 75- volts), extra micro - farads come

4000 USE CURVE USE CURVE USE CURVE 3000 2000 1000 0 0 100 200 300 400 500 600 700 800 900 1000 MAXIMUM DC LOAD CURRENT (MILLIAMPS) A WITH TRANSF

ease. Additional features include an RF pre -amplifier and a 550 MHz prescaler. In 95% factory as- sembled kit form, the instrument sells for $1

Here's the universal digital clocking source you always needed but couldn't afford 1 F YOU HAVE BEEN INVOLVED in de- signing and building d

with the chip for the pin numbers of the additional buffers. Construction. Assuming that you will utilize a PC board for assembly of the pulse

PULSTAR be sensitive to clock pulsewidth varia- tions. With this pulse generator, you will be able to check the operating mar- gins of suc

Are- COUNkC4IkCITA r" ' ' . r wp` - - ,; ,r r ,.- - N Nf 10 Pf100 Pf I0 RE 100 RAI I E Rf U1PAC ITV PRESS MkY'BE YOUR JUNK BO

CAPACI TA of capacitance. It takes a thousand picofarads to equal one nanofarad, and a thousand nanofarads to equal one microfarad. The scales o

CAPACITOR UNDER TEST R13 R15 IOK 100K R14 R16 3900 39K IIl Sla BP2 i. BPI 02 IN914 nFX100 nF X10 nF I pFX10Ó RANGE SWITCH (SI) I POSITIONS ( FOR /

CAPACITA choice. For calibration of the lower four ranges you will need another reference capacitor; since calibration can take place on any

When working with various elec- tronic projects, it's easy to get carried away with too many cur - rent -eating components, which can overl

Smart Power grommet around the line cord exit hole in the chassis to protect the cord from the heat that will be there due to ICs 1 and 2.

r MINI-REG trAii the regulated IC Power Supply Keep your projects cool, calm and under control with this peppy power supply HERE'S A LOW -CO