Electret Type Microphone
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An electret-type microphone is a condenser microphone in which the electrical charges are created by a thin layer of polarized ceramic or plastic films (electrets). The ability of the electrets to keep the charge obviates using the source for a high-voltage polarization.
Electret-type microphone. AP = acoustic pressure, Uo = output voltage, 1 = diaphragm, 2 = electret, 3 = case.
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