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Noise filter for DC fan

Discussion in 'General Electronics Discussion' started by HellasTechn, May 11, 2013.

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  1. HellasTechn

    HellasTechn

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    Apr 14, 2013
    I have a small (12V) (pc cpu fan) and i wanted to eliminate the noise in introdices to the DC supply line . I think all i need is just a capacitor in paralel with the fan. isnt that right ?
    But what capacitance would be best ? like 10uf ?
     
    Last edited: May 11, 2013
  2. davenn

    davenn Moderator

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    Sep 5, 2009
    yes in parallel, try some smaller values ... 0.1uF or 0.01uF
    you will probabaly have to do some experimenting to get the best value


    Dave
     
  3. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    I would probably start with 0.1uF -- but Dave beat me to it :)
     
  4. HellasTechn

    HellasTechn

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    Apr 14, 2013
    Lower value to cut off higher frequency right ?

    Thank you !!!
     
  5. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    And because their ESR value is lower. And because they generally have a lower inductance.

    All of those things combine to get better performance at higher frequencies.
     
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