crystal microphone

crystal microphone

A microphone used for aircraft radio transmissions in which sound pressure waves distort a piece of piezoelectric crystal.

A diaphragm in the microphone is attached to a crystal of Rochelle salt or other piezoelectric material in such a way that, when sound waves vibrate the diaphragm, it distorts the crystal.

When the crystal vibrates, it produces a voltage across two of its opposite faces that changes in exactly the same way the sound pressure changes.

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Industry/Domain: Aviation
Category: Aeronautics
Company: Aviation Supplies & Academics
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