VOLTAGE_CONTROLLED_AMPLIFIER_OR_TREMOLO_CIRCUIT

Published:2009/6/25 20:56:00 Author:May | From:SeekIC

The transistors form a differential pair with an active current-source tail. This config-uration, known technically as a variable-transconductance multiplier, has an output proportional to the product of the two input signals. Multiplication occurs due to the dependence o f the transistor transconductance on the emitter current bias. Tremolo (amplitude modulation of an audio frequency by a sub-audio oscillator-normally 5-15 Hz) applica-tions require feeding the low frequency oscil-lator signal into the optional input shown. The gain control pot maybe set for optimum depth.



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