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How the carbon button mic worked and the Bell magnetically driven mic before that. B. Lillquist shows us a later Shure Brothers carbon mic, also known as a "carbon transmitter". The carbon mic was used with early AM radio, music recording and was the main form of mic used in telephones until the 1980s.

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More information about how the Carbon Microphone changed life in America 

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More information about how the Carbon Microphone changed life in America 

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It is made the world more open and honest. People now share, with the telephone and long distance communication, the world is one.

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How did the Carbon Microphone change life in America

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How did the Carbon Microphone change life in America

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The Carbon Microphone once were known for their high output level performance, low impedance and reasonably low cost. They can withstand damage from high voltage transients.

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The carbon microphone forms the basis of millions of telephone instruments in use today!

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It is known as a carbon button microphone or a carbon transmitter. Direct current passes through the two plates and the changing resistance results in changing current.

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The carbon microphone is a microphone that converts sound to an electrical audio signal. It has two metal plates separated by granules of carbon.

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1877

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David Edward Hughes