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: 47133
author: Thomas Scarborough
visits: 34073
author: smartkit
visits: 27983
author: (C) G. Forrest Cook 1999
visits: 22881
author: Andy Collinson
visits: 21779
author: RED Free Circuit Designs
visits: 14430
author: R Ward 1998
visits: 13769
|
Audio
