Carbon Button Microphone
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In a carbon-button microphone, the sound field acts upon an electroconductive diaphragm that develops pressure on a packet of carbon granules. The contact resistance between the granules depends on the pressure. When a DC voltage is applied across the packet, the alternating resistance produces an AC voltage drop, which is proportional to the sound intensity.
Carbon-button microphone. AP = acoustic pressure, R = variable resistance,
1 = electroconductive particles, 2 = diaphragm, 3 = electrode.
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