What is the principle of the microphone?

The electrodynamic microphone comes in two varieties: reel and ribbon. The coil consists of a membrane and a magnetic system (permanent magnet and moving coil). The diaphragm is connected to a moving coil. As soon as it starts to vibrate, the moving coil starts moving. Moving along the magnetic rod, an electromagnetic field arises in the turns of the coil, which, being converted into an electrical signal, is actually a useful output signal.

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