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  1. #1
    tweakedgeek tweak'e's Avatar
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    Default running 12v fan on AC

    thought this might appeal.
    just working on a project today and needed some fans to provide air flow for my air compressor cooler.
    of course i found 4 case fans....... then another two fans. so 6 fans it is.
    and just now i found another two fans

    but do you think i could find a spare 12v power pack.
    but according to a certain someone who puts *ick in a vice, a lot of dc motors are universal motors, well thats what i remember from utube.
    so dug out an old 9v AC pack.
    what do you know it actually runs, and runs six of them at 8.5 volt.
    however they are a tad slow so will be looking for a proper 12v DC supply.
    Tweak it till it breaks

  2. #2
    Senior Member 1101's Avatar
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    Default Re: running 12v fan on AC

    alot of DC motor will run backwards on reverse polarity, so totally unsuited to AC

    Not something I'd recommend in general. :-)

  3. #3
    tweakedgeek tweak'e's Avatar
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    Default Re: running 12v fan on AC

    found an old 12v 4a dc supply for some other computer thingy i have long since forgotten about.
    so used that instead. big increase in speed.
    actually i don't think the 9v was slowing it down rather it stayed at fixed speed due to the 50hz.
    all the fans where doing about the same airflow on ac but now on dc the air flows are different.
    also i do hear that the ac gives the brushes a hard time, so its probably best to run them on dc.

    so now my compressor sounds like a swarm of angry wasps.
    Tweak it till it breaks

  4. #4
    amateur expert dugimodo's Avatar
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    Default Re: running 12v fan on AC

    I use an old router power supply to run some fans, they tend to be 12V.
    I'm surprised they worked on AC, would not have expected that.
    Ryzen 2700X, 16Gb DDR4RAM, 512GB M.2 NVME SSD, MSI GTX1070

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