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Variable Power Supply

Discussion in 'Power Electronics' started by CJR, May 12, 2013.

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  1. CJR


    Jan 13, 2013
    Im gonna start working on a variable power supply and wanted to be able to have a fine and coarse voltage potientometers. The PCB provided have three holes for the voltage adjustment potentiometer and i wanted to add that extra potentiometer. Any help? Thanks!
    Heres the link:
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    What you can do depends on how your circuit looks like. Is the potentiometer used as a voltage divider or as a variable resistor? Also: what is the supposed value of the potentiometer?
    Both cases can be solved using two potentiometers, one with a large resistance (for coarse adjustment), one with a small resistance (for fine adjustment). But the required circuits would be different.
    Another option is using a precision 10.turn potentiometer which allows fine adjustmendt using only one knob.
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