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Home Security System

2017-08-16 21:55  
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This alarm circuit activates when SI through S5 are activated. This lights LED1 and activates Ql via IC1C and IC1D. RY

Home Security System 
 

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.