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What is a carbon microphone?

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The carbon microphone, which was used in the first telephones and was very popular in telephones until about 1970, contains loosely packed carbon grains. Sound makes the diaphragm vibrate, causing the grains to be compressed and released, thus changing the resistance of the microphone.

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Similar questions: How does a carbon microphone work? When was the carbon microphone used? [ Hide these questions ]

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