A Simple Fire-Door Alarm circuit


Posted on Feb 4, 2014

This circuit will let you know when something that should be kept closed - has in fact been left open. Attach it to a Fire-Door. It will allow you to pass through the door as usual. However, if it`s left open for more than 30-seconds or so - the buzzer will sound..


A Simple Fire-Door Alarm circuit
Click here to download the full size of the above Circuit.




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