House Alarm Loop Circuit

  
This circuit offers open and closed loop contacts (switches 1,2,3) that triggers the alarm ON and stays ON for 5 -10 minutes. The trigering delay (entrance/exit) is 27 seconds. This simple alarm circuit Has also a cancel button for reseting the circuit to stand-by mode again....

House Alarm Loop Circuit - img1

It uses 4001 and 4011 gates and one NPN transistor who drives the siren.




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