simpler cmos single zone alarm


Posted on Feb 4, 2014

This circuit features automatic Exit/Entry delays, timed Bell Cut-off and System Reset. It will accommodate the usual normally-closed input devices (Magnetic Reed contacts, Micro Switches, Foil Tape and PIRs). And - with a simple modification - a normally-open trigger may be added..


simpler cmos single zone alarm
Click here to download the full size of the above Circuit.




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