The ribbon microphone works on the same principle as the dynamic microphone. It uses a thin metal ribbon suspended between the poles of a magnet to sense the sound wave. When the ribbon moves, it disturbs the magnetic field generated by the permanent magnet, and this induces a voltage in the ribbon. This voltage becomes the signal output. This design is not commonly found in modern microphones, because the ribbon moves mechanically adding unwanted noise to the signal.
Ribbon mics are considered to be very sensitive and accurate. They work by suspending a thin metal foil in a magnetic field. Just like the controlled reluctance elements, moving the ribbon will change the magnetic field. The ribbon is very thin and folded up so it moves very easily when sound hits it, but they are very delicate and expensive to make and repair.
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