voltage gain amplifier Archives - Amplifier Circuit Design https://amplifiercircuit.net/tag/voltage-gain-amplifier Amplifier Project Schematic Diagram Fri, 23 Dec 2011 03:29:31 +0000 en-US hourly 1 103688205 Voltage controlled variable gain amplifier https://amplifiercircuit.net/voltage-controlled-variable-gain-amplifier.html https://amplifiercircuit.net/voltage-controlled-variable-gain-amplifier.html#respond Sun, 02 Oct 2011 20:05:21 +0000 http://amplifiercircuit.net/?p=600 The Voltage controlled variable gain amplifier circuit is built with ic op amp type LM101. The 2N5457 works as a […]

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]]> Voltage controlled variable gain amplifierThe 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.

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