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10 Types of Microphones

9

Carbon Microphones

Carbon microphone
Carbon microphone
©iStockphoto.com/Kirk Rothrum

The oldest and simplest microphone uses carbon dust. This is the technology used in the first telephones and is still used in some telephones today. The carbon dust has a thin metal or plastic diaphragm on one side. As sound waves hit the diaphragm, they compress the carbon dust, which changes its resistance. By running a current through the carbon, the changing resistance changes the amount of current that flows.

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