Computer fan speed control pot?

Discussion in 'Hobby Electronics' started by NormL, May 24, 2005.

  1. NormL

    NormL Guest

    Hi All;
    I installed another fan in my computer case. Now it sounds like a Jumbo
    Jet taking off. I realised that I only need the fan when the weather is hot.
    I got to wondering if I couldn't install a pot in series with the fan to
    slow down it's speed and, by turning slower, quiet it down.

    Trouble is I don't know what size of pot (in ohms) to put in the line.
    Any suggestions?

    Norm
    NormL, May 24, 2005
    #1
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  2. "NormL" <> wrote in message
    news:d6v8l8$4tj$...
    > Hi All;
    > I installed another fan in my computer case. Now it sounds like a Jumbo
    > Jet taking off. I realised that I only need the fan when the weather is
    > hot.
    > I got to wondering if I couldn't install a pot in series with the fan to
    > slow down it's speed and, by turning slower, quiet it down.
    >
    > Trouble is I don't know what size of pot (in ohms) to put in the line.
    > Any suggestions?
    >
    > Norm
    >
    >


    There's all sorts of things you can do.

    Have a look at
    http://www.cpemma.co.uk/index.html

    Or consider an off the shelf item like
    www.zalman.co.kr/eng/product/view.asp?idx=70&code=017

    IMHO pots present problems, either use PWM or a switched diode voltage
    dropper

    Rob
    Robert Murphy, May 24, 2005
    #2
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  3. NormL

    David Segall Guest

    "NormL" <> wrote:

    >Hi All;
    > I installed another fan in my computer case. Now it sounds like a Jumbo
    >Jet taking off. I realised that I only need the fan when the weather is hot.
    >I got to wondering if I couldn't install a pot in series with the fan to
    >slow down it's speed and, by turning slower, quiet it down.
    >
    > Trouble is I don't know what size of pot (in ohms) to put in the line.
    >Any suggestions?
    >
    > Norm
    >

    I don't have a direct answer to your question but I installed a second
    fan and DPDT Center Off switch to switch them in series, parallel or
    off. It works well so I guess that a pot of about the same resistance
    as your fan should be OK.
    David Segall, May 24, 2005
    #3
  4. NormL

    Gary Slater Guest

    Or... try here?.....

    http://www.almico.com/speedfan.php


    "NormL" <> wrote in message
    news:d6v8l8$4tj$...
    > Hi All;
    > I installed another fan in my computer case. Now it sounds like a Jumbo
    > Jet taking off. I realised that I only need the fan when the weather is
    > hot.
    > I got to wondering if I couldn't install a pot in series with the fan to
    > slow down it's speed and, by turning slower, quiet it down.
    >
    > Trouble is I don't know what size of pot (in ohms) to put in the line.
    > Any suggestions?
    >
    > Norm
    >
    >
    Gary Slater, May 29, 2005
    #4
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