How does an electrodynamic microphone work?

An electrodynamic microphone converts sound vibrations in the air into vibrations in electrical voltage. The voice coil is housed in a permanent magnet annular gap. A thin diaphragm rigidly connected to the coil is elastically connected to the magnet body. A sound wave, acting on the diaphragm, causes it to vibrate along with the coil. As a result, an EMF of induction arises in a non-uniform magnetic field in the coil. This leads to the appearance of an alternating voltage between the terminals of the coil.

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