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Proxmimity Sensor help

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harm

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hi im looking for a proximity sensor cicuit ive looked around and i couldnt find one i want it to activate some kind of buzzer i dont really want anything complex just a real simple proximity sensor anyone has one?

thanks
 
hi harm, take a look at this page. Build the last circuit. It worked for me. It won't latch though, it will only stay on if a hand is close to it (only a couple inches). It could be amplified though so it would be a couple feet.
 
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