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Home › Magazines › 2008 › July/August › Bell Alarm

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Bell Alarm

Published in issue 379, July/August 2008

If you use a lamp with a motion sensor for outdoor lighting, the original electrical switch is actually no longer necessary. If you replace the switch with the circuit described here, an acoustical signal will be generated each time the outdoor lamp is switched on. It’s thus somewhere between an alarm and a doorbell.

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