Sensors & control - all subcategories
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
visits: 34687
author: RED Free Circuit Designs
visits: 34571
author: Motorola
visits: 32669
author: smartkit
visits: 29168
author: RED Free Circuit Designs
visits: 28003
author: (C) G. Forrest Cook 1999
visits: 24580
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