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Converted server psu's

Discussion in 'Power Electronics' started by sureshot, Aug 9, 2016.

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  1. sureshot

    sureshot

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    Jul 7, 2012
    I have a bit of a hobby going on converting old server power supplys, my use of these is mainly for cb radio. What I've noted with a few is electrical noise when connected up to the radio, some units are fine and are clean enough on there output for use, others are just to noisy.

    An example is the hp 1200 dps unit, it gives a fairly large noise component when connected up to cb radio. So my question is this, does anyone have a filter circuit that can be built as an external add on to clean up the output, a schematic maybe for a wide frequency filter to clean up this noise. I don't have the use of a scope, so it makes it a bit tricky, although a suspect the fan pwm to be the noise culprit, although that's speculation on my part.

    Thanks for reading, any help appreciated.
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

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    Nov 17, 2011
    Try a standard mains filter (here's an example). These are built to suppress radio interference on mains and should be suitable for your application, too (from a bandwidth perspective). You'll have to observe the current rating!
     
  3. sureshot

    sureshot

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    Jul 7, 2012
    Thanks Harald for your help, I will give this company a call and see how much one of these emi filters would be. Thanks again for the link.
     
  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,702
    2,717
    Nov 17, 2011
    You'll probably not be able to buy directly from the company. Try the usual suspects (Mouser, Farnell etc.). This kind of filter is usually on stock.
     
  5. sureshot

    sureshot

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    Jul 7, 2012
    I will have a look round these suppliers, thanks Harald.
     
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