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Consumer Electronics by S. P. Bali

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MOVING COIL (DYNAMIC) MICROPHONES

We now come to one of the most common type of transducers, the principle being used both for microphones and loudspeakers.

This type of microphone [Fig. 2.10(a)] works on the generator principle. The diaphragm carries a coil of wire placed in an intense magnetic field of constant value (B). Movements of the diaphragm, consequent upon sound pressure changes, result in an emf (E images Blv) being generated in the conductor. This emf is proportional to the velocity of motion (v) of the conductor in the air-gap: if the microphone is to have the same sensitivity at all frequencies it is necessary for the velocity of motion ...

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