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Hobby in Electronics ― This is the circuit of a simple buzzer that is activated by darkness, the buzzer is off when there's light and on when it is dark. A general-purpose operational amplifier, the 741, is used as a comparator that determines whether it is dark enough ...
Tags: Photoresistor, Operational Amplifier, Oscillating, Buzzer
Shyamal ― 5 Jul, 11
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