sound-powered telephone

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sound-powered telephone [′sau̇nd ¦pau̇·ərd ′tel·ə‚fōn]

(engineering acoustics)

A telephone operating entirely on current generated by the speaker's voice, with no external power supply; sound waves cause a diaphragm to move a coil back and forth between the poles of a powerful but small permanent magnet, generating the required audio-frequency voltage in the coil.

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