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: 48858
author: Thomas Scarborough
visits: 36350
author: smartkit
visits: 35299
author: RED Free Circuit Designs
visits: 34716
author: Motorola
visits: 33927
author: smartkit
visits: 29332
author: RED Free Circuit Designs
visits: 28327
author: (C) G. Forrest Cook 1999
visits: 24915
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