Voltage Controlled Resistor

Discussion in 'The Projects Forum' started by SKMR168, Oct 9, 2016.

  1. SKMR168

    Thread Starter New Member

    Aug 8, 2015
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    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?
     
  2. DickCappels

    Moderator

    Aug 21, 2008
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  3. hp1729

    Well-Known Member

    Nov 23, 2015
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    What voltage do you have to control it? What resistance do you need?
     
  4. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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  5. SLK001

    Well-Known Member

    Nov 29, 2011
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    Look at vactrols. Depending on your requirements, you might find what you need.
     
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