• An instrument, device, or object which converts a physical magnitude or other measurable or detectable quantity into a corresponding electrical signal. These include devices which translate flashing lights, sounds, the undulations of the grooves of a phonographic disc, the lands and pits of an optical disc, or a scene, into electrical signals. Microphones, phonograph pickups, and TV cameras are examples. A pickup is also a transducer when it converts one form of energy into another, as is the case of a microphone.
  • The minimum magnitude, such as that of a current or voltage, required to actuate a relay.
  • The sounds and/or scenes which are being detected for recording or broadcast, as for TV or radio.
  • synonym phono cartridge

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