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Varying voltage

Discussion in 'General Electronics Discussion' started by Petr Kocour, Mar 10, 2018.

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  1. Petr Kocour

    Petr Kocour

    2
    0
    Mar 10, 2018
    Hi,
    I know it may be a stupid question, but I'd like to vary voltage between 5 and 12 V using a potentiometer to control my PC fans. The PSU has 12 and 5 V cables. I was thinking about using the pot as voltage devider , but instead of connecting one lead to ground and the other one to 5V ,connecting one to 5V and the other one to 12V. Would that work? Thanks in advance
     
  2. Alec_t

    Alec_t

    2,970
    805
    Jul 7, 2015
    Welcome to EP!
    Your PC fans are probably already controlled by the PC, using a PWM technique rather than simply varying the fan voltage, so you would need to avoid interfering with that.
    How exactly do you plan to use the potentiometer to control speed?
     
  3. Petr Kocour

    Petr Kocour

    2
    0
    Mar 10, 2018
    The fans are simple DC motors with two wires coming from them.
     
  4. Externet

    Externet

    773
    168
    Aug 24, 2009
  5. Cannonball

    Cannonball

    191
    53
    May 6, 2017
    Install a reastat in the positive lead going to the fan.
     
  6. CTP4500

    CTP4500

    21
    0
    Mar 3, 2018
    Doesn't it automatically adjust? pc fans. Just like the voltage regulators in a car alternator.
     
  7. kellys_eye

    kellys_eye

    4,275
    1,147
    Jun 25, 2010
    No.
    No.
    Yes.

    If you're going to do it, do it right.
     
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