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.

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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