puff to off circuit


Posted on Feb 6, 2014

This is a circuit diagram of a simple circuit in which the LED burning can be activated only by a gust OFF. A condenser mic (M1) is used to feel your breath. When the S1 button is pressed, transistors Q2 and Q3 as a couple wires attached will be activated and drives LED shines. LED remains in this condition. When you puff on a condenser mic, the s


puff to off circuit
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ound pressure converted into a voltage signal at the output. This voltage signal is amplified by the transistor Q1. Since collector of Q1 coupled to the emitter of the pair attached, the couple will stop doing as there ever was a signal from a condenser mic for panting and the LED will go OFF. Push button switch S1 should be pressed again to turn the LED ON. The following is a schematic drawing:




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