A microphone, sometimes referred to as a mic or mike ( pronounced /?ma?k/), is an acoustic-to-electric transducer or sensor that converts sound into an electrical signal.

A change in plate spacing will cause a change in charge Q and force a current through resistance R. This current "images" the sound pressure, making this a "pressure" microphone.

Simple microphone preamplifier circuit which allows dynamic microphones to be used with SoundBlaster soundcards.

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In the magneto-dynamic, commonly called dynamic, microphone, sound waves cause movement of a thin metallic diaphragm and an attached coil of wire.