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
visits: 48558
author: Thomas Scarborough
visits: 36255
author: smartkit
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author: (C) G. Forrest Cook 1999
visits: 24580
author: Andy Collinson
visits: 24513
author: RED Free Circuit Designs
visits: 15401
author: R Ward 1998
visits: 15104
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