The dynamic or moving coil microphone was introduced around 1930 and the velocity or ribbon microphone in 1932.
2.
Ribbon microphones are similar to moving coil microphones in the sense that both produce sound by means of magnetic induction.
3.
The voltage output of older ribbon microphones is typically quite low compared to a dynamic moving coil microphone, and a step-up transformer is used to increase the voltage output and increase the output impedance.
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