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| Electronic Project Kits |
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TOUCH SWITCH WITH RELAY KIT The touch switch may be used to turn on almost anything with a light touch of ‘plate’. The circuit pulls in a relay which remains engaged for anything from five seconds to about a full minute, depending upon you changing just one resistor to set the time amount (default is five seconds). One of the unique features of this circuit is that the touch-plate may be located up to several yards away from the circuit board if necessary. It may also be battery powered if an AC supply is not convenient. An LM555 is used in the heart of the circuit. The relay can handle up to 12A in its contacts. A 12V battery pack or AC power supply is recommended although we’ve used the circuit on an unregulated 9V supply. 80-137 .................................................................. $10.95 |
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 PC Board only pictured, But ALL parts included. |
SQUARE WAVE OSCILLATOR
KIT This is a very simple circuit, generating square waves for use with test equipment, teaching, etc. Generates square waves of approximately 1Hz, 100Hz, 1KHz, 10KHz, & 100KHz. This is a good teaching aid kit, both for the instructor and the DIY user. 80-111 ................................................................ $15.95 |
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MINI-VOX & RELAY KIT (SOUND ACTIVATED SWITCH) For the uninitiated, VOX = Voice Activated Switch. This is a switch (relay ) that may be activated with any sound, including the human voice. A very sensitive circuit that may be adjusted to react to very low volume sounds or a yell or hand clap. While a VOX is often used to activate a sound recorder, it may be used to trigger an alarm (the mike easily picks up vibrations in windows, walls or door), activate a video camera, radio transmitter or simply turn on a light. The relay may release after a few seconds of silence, holding as long as sound continues. (hold time may be changed up to 30 seconds) Operates on 12V DC very low current. 80-126 ................................................................ $14.95 |