#transducer  an electrical device that converts one form of energy into another
  supertype:  electrical_device  a device that produces or is powered by electricity
  subtype:  electro-acoustic_transducer  a transducer that converts electrical to acoustic energy or vice versa
     subtype:  cartridge.electro-acoustic_transducer__pickup  an electro-acoustic transducer that is the part of the arm of a record player that holds the needle and that is removable
        subtype:  crystal_pickup__crystalpickup  a cartridge in which an output voltage is produced by the vibration of a piezoelectric crystal
     subtype:  earphone__earpiece__headphone__phone  electro-acoustic transducer for converting electric signals into sounds; it is held over or inserted into the ear; "it was not the typing but the earphones that she disliked"
        subtype:  telephone_receiver__telephonereceiver__receiver  earphone that converts electrical signals into sounds
           subtype:  headset  receiver consisting of a pair of headphones
     subtype:  loudspeaker_system__loudspeakersystem__loudspeaker__speaker__speaker_unit__speakerunit__speaker_system__speakersystem  electro-acoustic transducer that converts electrical signals into sounds loud enough to be heard at a distance
        subtype:  bullhorn__loud-hailer  a portable loudspeaker with built-in microphone and amplifier
        subtype:  squawk_box__squawker__intercom_speaker  the loudspeaker on an inter-com or public address system
        subtype:  tannoy  (British) a loudspeaker
        subtype:  tweeter  a loudspeaker that reproduces higher audio frequency sounds; "the sound system had both tweeters and woofers"
        subtype:  woofer  a loudspeaker that reproduces lower audio frequency sounds
     subtype:  microphone__mike  device for converting sound waves into electrical energy
        subtype:  bug.microphone  a small hidden microphone; for listening secretly
        subtype:  condenser_microphone__condensermicrophone__capacitor_microphone__capacitormicrophone  microphone consisting of a capacitor with one plate fixed and the other forming the diaphragm moved by sound waves
        subtype:  crystal_microphone__crystalmicrophone  a microphone in which sound waves vibrate a piezoelectric crystal that generates a varying voltage
  subtype:  mosaic.transducer  transducer formed by the light-sensitive surface on a television camera tube
  subtype:  photoelectric_cell__photoelectriccell__photoconductive_cell__photoconductivecell__photocell__electric_eye__magic_eye__magiceye  a transducer used to detect and measure light and other radiations
     subtype:  selenium_cell  a photoelectric cell that uses a strip of selenium

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