Categories: Other Amplifier

Voltage controlled variable gain amplifier

The Voltage controlled variable gain amplifier circuit is built with ic op amp type LM101. The 2N5457 works as a voltage variable resistor having an Rds(on) max of 800 ohms.

Because the differential voltage on the LM101 is within the low mV range, the 2N5457 JFET will have linear resistance over several decades of resistance giving a good electronic gain control.

Amplifier Circuit

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