Variable gain amplifier circuit

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Variable gain amplifier Shown is a variable gain amplifier. For fixing the input signal, the output signal amplitude of the controllable amplifier circuit.
Variable gain amplifier circuit - schematic

The electrical main road is an operational amplifier, negative feedback circuit by changing the amount of feedback to change the gain of the amplifier, the figure having a base control terminal double gate field effect transistor PIX429D negative feedback control device, the control voltage -10 to - 2 V of the change between, making the output between 220 mV ~ 2.2 V change.

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