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Voltage controlled variable gain amplifier II

2014-12-20 15:10  
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The 2N5457 acts as a voltage variable resistor with an RdS of 800 ohms max
Voltage controlled variable gain amplifier II

Since the differential voltage on the LM101 is in the low mV range, the 2N5457 JFET will have linear resistance over several decades of resistance providing an excellent electronic gain control.



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