Automatic Turn-Off Alarm With Delay

  
In this circuit, IC1A and IC1B act as a monostable multivibrator. Any input from the sensors SI through
Automatic Turn-Off Alarm With Delay - schematic

S5 forces IC1A to produce logic low, which causes IC1B to turn on Ql until C3 changes through R6. This action resets the latch formed by IC1A and IC1B.




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