Night Alert Circuit


This is my circuit Night Alert published in Electronics For You November 2008 issue. I got this idea in the midnight when my pet dog barked continuously by sensing shadows of moving leaves in wind.This circuit turns on a Lamp for three minutes when the dog barks and then goes off .This makes the dog silent and also gives the impression that the occupants have been alerted. So it is a tricky device to confuse the intruders.Click to see the circuit in pdf

Night Alert Circuit

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