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Automatically Turn Off The Alarm Delay

2016-02-18 14:06  
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The alarm automatically turns off eight minutes delay circuit using NE555 timer and  CD4020B . When the 12-volt DC circuit after being applied to the C2 is set to low IC2, open relays, pulse generator and IC1. The pulse counter IC1 IC2.

Auto Turn-Off Alarm With 8-Minute Delay 
 

 8192 clock cycles later, IC2 output terminal (pin 3) goes high, cut Q2, to complete the cycle.

 



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