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A sensor converting an acoustic signal into an electric one.

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2 answers
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Headset microphone is noisy, but touching speaker wires removes the noise

I'm repairing my simple wired headset which is composed of two little speakers and one microphone. The audio and mic jacks are separate. The speakers work fine. But the microphone is very noisy. … As I was playing with wires, I found out that when I touch both ends of the speaker wire, the microphone noise goes away. Short-circuiting the speaker wire alone won't work. …
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