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Potentiometer w/ Capacitor

Discussion in 'Electronics Homework Help' started by *Neon23, Mar 19, 2018.

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  1. *Neon23

    *Neon23

    4
    0
    Mar 19, 2018
    I'm currently studying about transistors and I would like some guidance on this part
    where an amplifier has this kind of circuit
    upload_2018-3-19_17-22-9.png




    For the DC Equivalent Circuit
    The potentiometer would be a fixed resistor and the capacitor would be open and would result to a circuit of
    upload_2018-3-19_17-40-48.png




    On an AC Equivalent Circuit
    upload_2018-3-19_17-36-19.png
    the capacitor would be shorted. However I can't seem to understand how would the potentiometer act on this circuit
     

    Attached Files:

  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,806
    2,749
    Nov 17, 2011
    You need to replace the potentiometer by two resistors that add up to the value of the potentiometer. Using a single resistor represents only the special case with the wiper in the top position.
    upload_2018-3-19_12-46-38.png
     
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