Voltage Controlled Resistor

Thread Starter

SKMR168

Joined Aug 8, 2015
13
I am building a Wien bridge oscillator with automatic gain control(AGC) circuit. How to select the appropriate transistor as a voltage controlled resistor.
First of all out of BJT,MOSFET and JFET which one to select? Again how to decide the desired specification of that selected category of transistor
Lastly, can we exactly know the range of resistance which can be achieved by varying the voltage?
 

hp1729

Joined Nov 23, 2015
2,304
I am building a Wien bridge oscillator with automatic gain control(AGC) circuit. How to select the appropriate transistor as a voltage controlled resistor.
First of all out of BJT,MOSFET and JFET which one to select? Again how to decide the desired specification of that selected category of transistor
Lastly, can we exactly know the range of resistance which can be achieved by varying the voltage?
What voltage do you have to control it? What resistance do you need?
 
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