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: 32901
author: Thomas Scarborough
visits: 21879
author: smartkit
visits: 19745
author: (C) G. Forrest Cook 1999
visits: 14210
author: Andy Collinson
visits: 13857
author: RED Free Circuit Designs
visits: 10120
|
Audio
