Phantom power
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Phantom power, in the context of professional audio equipment, is direct current electric power equally applied to both signal wires in balanced microphone cables, forming a phantom circuit, to power
A condenser microphone requires power to produce a DC polarizing voltage and to power an internal amplifier required to drive long cables
Phantom power button and indicator light
An external phantom power supply.
AKG C1000S, uses phantom power or a battery
Microphone
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A microphone, colloquially called a mic, or mike, is a transducer that converts sound into an electrical signal. Microphones are used in telecommunication, sound recording, broadcasting, and consumer
Phantom power
…cables, forming a phantom circuit, to power microphones that contain active electronic circuitry. It is best known as a convenient power source for condenser microphones, though many active direct boxes also use it. The technique is also used in other applications where power supply and signal communication take place…
Shure Brothers microphone, model 55S, multi-impedance "Small Unidyne" dynamic from 1951
David Edward Hughes invented a carbon microphone in the 1870s.
Humphrey Bogart, Jack Brown, and Lauren Bacall with RCA Varacoustic MI-6203 ribbon microphones broadcast to troops overseas during World War II.
A modern version of the Shure SM57 dynamic microphone