carbon microphone

carbon microphone

A type of microphone used in a telephone and with some types of radio transmitters. The sensitive element in a carbon microphone is a tube of carbon granules, or grains of carbon. A flexible diaphragm acted on by sound waves presses against the carbon inside the tube.

When the diaphragm pushes the carbon granules together (compresses them), the resistance of the carbon becomes less than when the diaphragm allows the granules to relax.

The looseness or tightness of the granules in the tube determines the resistance of the carbon, and this resistance changes in the same way the air pressure caused by the sound waves changes.

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Industry/Domain: Aviation
Category: Aeronautics
Company: Aviation Supplies & Academics
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