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| Electronic Project Kits |
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SOUND ACTIVATED SWITCH FOR
TAPE
RECORDER (VOX SWITCH) Turn on any tape recorder that has remote on/off jack (most cassettes). The circuit has feed back and delay circuit for robust operation. You could add a relay for switching heavy loads; and tape recorders are not the limit. How about turning on lights via voice or a whistle? Circuit switches off after 6 seconds of silence. 80-130 ................................. $13.95 |
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110 VOLT AC STROBE
LIGHT KIT Usually more practical then a battery operated strobe, runs on standard house current. The flash rate is adjustable from about one every three seconds to about three per second, Uses are as signal beacon, trade show kiosks, discos, etc.. Very bright flash can be seen for miles at night, Like those in airplanes. AC cord and plug not included. 80-140 .................................$29.95 |
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LOGIC PROBE An indispensible piece of equipment for testing and measuring digital equipment. Normally used for fault finding and testing but can also be a great help in design work or to see how digital equipment works.Switch for use in both TTL and CMOS. Detects very fast pulses. Output is 3 LED’s and audio indicator. 80-240 .................................$12.95 |
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AUDIO AMPLIFIER MODULE A good, variable gain amp to use with other projects, amplify radio circuits etc.. Use the National Semiconductor LM386 Intergrated Circuit, a well known and quality IC. Kit includes the data sheets from NS. Battery powered, may be operated from 4 to 12 volts DC. Powers a small speaker for personal listening. 80-170 ................................... $14.95 |
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FM TELEPHONE TRANSMITTER Miniature transmitter attaches to the phone line and transmits the conversation. Transmits 200 yards and more in most installations. Tunable to clear spot on the FM band of your radio. Completely parasitic; i.e. uses the power from a telephone line and needs no battery. The circuit might be used to share or record conversation, but please do not use illegally. 80-160 ................................... $9.95 |
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FIBER OPTIC AU Uses a matched transmitter/ reciever pair from either Motorola or Industrial Fiber Optics Co. Allows you to send sound through plastic 1mm fiber optic cable. Two circuit boards with a microphone at one end and a speaker at the other (14’ fiber optic cable included).The maximum range is about 220 yards. This can be a Science Fair winner. 80-260 ................................. $49.95 |
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ULTRASONIC MOVEMENTDETECTOR The circuit uses a matched pair of 40Khz transducer elements to detect movement out to about 22 feet. You may add a relay (not included) to switch a heavy appliance etc, the unit switches just an LED as supplied. The circuit can be switched to latch “on”. An ideal alarm circuit that can’t be easily fooled. 80-200 ................................. $29.95 |
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OpAMP FUNCTION GENERATOR A very low cost and simple circuit to generate square, pseudosinewave and triangular waveforms in the audio frequency range. Uses a quad OpAMP type LM384. This is an educational kit and recommended to understand electronics more thoroughly. 80-230 ................................... $11.95 |
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ONE WATT AUDIO
AMPLIFIER(MONAURAL) While one watt is plenty for personal use (most small radios that have speakers produce less then 1/4 watt) the size is quite small and easy to fit it into a case with other projects. Battery operated from 3 to 15 volts, six volts is optimum. Output into an eight ohm speaker. The PC board is just 1-13/16” square, tallest component about 5/8” tall. 80-270 ................................... $10.95 |
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