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  1. Copilot Answer
    Electret material

    An electret is a stable dielectric material with a permanently-embedded electric dipole that persists for hundreds of years due to its high resistance and chemical stability. The name comes from electrostatic and magnet; dr… See more

    History

    Electret materials have been known since the 1920s and were proposed as condenser microphone elements several times, but they were considered impractical until the foil electret type was invented at Bell Laboratories in … See more

    Types

    There are three major types of electret microphones, differing in the way the electret material is used:
    Foil-type or diaphragm-type A film of electret material is used as the diaphragm itself. This i… See more

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