Contact microphone

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Metal disks with piezo material, used in buzzers or as contact microphones
Metal disks with piezo material, used in buzzers or as contact microphones

A contact microphone is a form of microphone designed not for picking up airborne sound waves, but rather to act as a transducer which picks up vibrations through solid materials and converts them into audible sound. Often used as an acoustic leakage probe, and known by the more technical term as a 'piezoelectric vibration transducer'. It also has been widely used as an instrument by noise music artists.

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