Home Security System

Posted on Sep 15, 2012

This alarm circuit activates when SI through S5 are activated. This lights LED1 and activates Ql via IC1C and IC1D. RY

Home Security System
Click here to download the full size of the above Circuit.

1 is wired to self latch. S10 is used to reset. When key switch SI is activated or when re-entry buttons at S6 are depressed, IC1C is deactivated until RC network R7/C3 charges.

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