Two-Zone Burglar Alarm circuit


Posted on Feb 7, 2014

This two-zone alarm has automatic exit, entry and siren cut-off timers. It was developed for the Beginner`s Guide To Cmos Timers. So it has a particularly detailed circuit description. There`s an optional One-Time-Only module. It will force the siren to switch off after the first ten minutes - and prevent the alarm from activating a second time..


Two-Zone Burglar Alarm circuit
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