Sound scooper
Electronic

We know a speaker gives off sounds, but did you know that it can also work as a microphone?

It can because the magnet in the speaker gives off weak electric currents whenever sound waves strike it. Normally a speaker doesn't make a good microphone. But in this circuit we have enough amplification to make a microphone.

Notice that we use two transistors in this project for increased amplification.

 

 

 

 

 

 

 

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