REMOTE TV VOLUME CONTROL

  
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Ultrasonic bursts from handheld transmitter are picked up by microphone and fed to ujt threshold detector 2N2646 that also generates trigger pulse. Two cascaded bistable dividers control three transistors shunted across volume control, to give full volume (no shunting) and three lower volume levels. -J. H. Phelps, Transistors Instead of Relays Tune
REMOTE TV VOLUME CONTROL - schematic

TV Volume, Electronics, 37:9, p 32-33.



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