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: 48877
author: Thomas Scarborough
visits: 36376
author: smartkit
visits: 35313
author: RED Free Circuit Designs
visits: 34742
author: Motorola
visits: 33969
author: smartkit
visits: 29356
author: RED Free Circuit Designs
visits: 28349
author: (C) G. Forrest Cook 1999
visits: 24954
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