Sensors & control - other
This circuit emits a beep and/or illuminates a LED when someone touches the door-handle from outside. The alarm will sound until the circuit will be switched-off.
author: RED Free Circuit Designs
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author: Thomas Scarborough
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author: smartkit
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author: (C) G. Forrest Cook 1999
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author: Andy Collinson
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author: RED Free Circuit Designs
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