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| Electronic Project Kits |
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TOUCH OR CONTACT SWITCH Both a touch and a contact switch are built into one PC board so that the builder can see how each works. A battery can power the contact switch but you’ll need an AC power supply for the touch switch to work well (use No. 80-040) for reasons explained in the kit. The circuit swiches a relay with a three amp, 110 volt rating. Use to switch lamps, other appliances. 80-100 ................................. $10.95 |
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LIGHT ALARM A sensitive photo Darlington transistor is used with CMOS nand gate. The circuit detects light and trigers a siren.You could add your own triac or relay and switch practically anything. The kit uses the MEL12 Darlington superalpha phototransistors, typically about ten times more sensitive than a normal phototransistor. The circuit usage includes burglar alarms, medicine cabinet alarm, automobile alarm etc... 80-080 ................................... $13.95 |
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STEREO PREAMPLIFIER KIT Amplify any tiny audio signals about fifty times, and deliver them to a power amplifier cleanly and undistorted. An AGC (automatic gain control) eliminates pops and distortion. This circuit will be useful in boosting the output from the tape heads, microphone or a magnetic phono cartridge etc.. For input of an audio amplifier. Requires a 12V DC power supply at about 100 mA peak. 80-104 ................................. $11.95 |
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UNIVERSAL TIMER Set timer for anywhere from a few seconds to about 15 minutes, control AC appliances; it will beep and trigger a relay when it has timed down. May be used for a darkroom or PC board exposure timer etc.. Turn anything on or off. Operates from 9 volt transistor battery. 80-102 ................................. $12.95 |
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HOME CAR ALARM This circuit is an alarm for the home or car door, and a lot more. It employs a magnet and reed switch to trigger the circuit. An integral piezo sounder produces the alarm sound (100dB). But, a relay capable of handling up to 10 amps AC may be connected to turn on or off appliance, external alarm sounder etc. Therefore the circuit could be used to turn on a light whenever a basement or garage door is opened. 80-101 ................................. $12.95 |
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PHOTO SENSOR WITHCONTROL RELAY The most popular usege for this kit is to make your own nite-light. But you could switch just about any appliance either on or off with either darkness or daylight. Light sensitivity is adjustable over quite a range. The relay can handle up to 10 amps AC. You need to add a nine volt transistor battery or a nine volt, 25 mA supply. 80-103 ................................... $9.95 |
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SOUND EFFECTS GENERATOR Another novel circuit that might be useful for special theatrical effects. Or if you are simply a practial joker. The circuit can produce sounds such as a tick-tock of a grandfather clock, a heart monitor (as in the hospital), water on a tin roof, a motor boat, cricket, etc.. Requires a 9 volt battery. Includes its own speaker. 80-106 ................................... $9.95 |
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VOICE CHANGER Your voice can be changed to add a vibrato, like those used to disguise secret witnesses. Or, you may change your voice tone upward or downward; women sound like men and vise versa. Includes a very ROBOTIC voice as well. A microphone and speaker are included on the PC board, all that you need to add is a nine volt transistor battery. This is a very novel and entertaining circuit. 80-105 ................................. $15.95 |
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