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Moving-coil microphone. Diagram showing the mechanism of a moving-coil microphone. A movable coil is attached to a flexible diaphragm. The coil fits over the central post of a cylindrical permanent magnet. If sound waves or vibrations cause the flexible diaphragm to move, the coil moves across the of the magnet. This induces a current in the coil, thus converting sound into an electrical signal.

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