carbon microphone


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Related to carbon microphone: movie camera, mimeograph

carbon microphone

n
(Electrical Engineering) a microphone in which a diaphragm, vibrated by sound waves, applies a varying pressure to a container packed with carbon granules, altering the resistance of the carbon. A current flowing through the carbon is thus modulated at the frequency of the sound waves
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Hughes, who was reportedly born in Green y Ddwyryd, near Corwen, in 1831 (though there is debate as to whether it was really London), and whose family lived in Bala, was the inventor of the carbon microphone and the printed telegraph system.
The carbon microphone was eventually replaced by a pressure sensor.