VACUUM_TUBE_THEREMIN_VOLUME_CONTROL_CIRCUIT

Published:2009/7/14 4:53:00 Author:May | From:SeekIC

Gain is controlled by a variable negative grid bias in an audio amplifier stage. This oscillator produces a negative dc voltage by means of a rectifier. As a hand is brought up to the volume plate antenna, this loads the oscillator, reducing output and hence the negative dc output. This means increased gain for the controlled audio stage.



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