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Simple Sound Activated Switch

We can turn on and turn off the lamp by using hand clapping, by use this simple circuit, but it must be connected to another circuit to became real switch (such as J-K flip flop to make a toggle condition).

This circuit will sense the sound around the mic condenser. When it sense a signal sound, then the output of LM 741 will high and then activated the transistor c9013. And then the relay will closed (if we use NO) or will open (if we use NC).

The circuit is shown below.  

Figure 1. Simple sound activated switch circuit.

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