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Thread: Converted MiniATX Power Supply

  1. #11
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    Default Re: Converted MiniATX Power Supply

    Quote Originally Posted by rstehle View Post
    The tutorial I followed when converting my PS mentioned putting a 10 ohm 10 watt resistor across one of the 5v leads and ground. Keeps a constant load on the PS.
    I woluld re-load all rails to test

  2. #12
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    Default Re: Converted MiniATX Power Supply

    Quote Originally Posted by rstehle View Post
    The tutorial I followed when converting my PS mentioned putting a 10 ohm 10 watt resistor across one of the 5v leads and ground. Keeps a constant load on the PS.
    We must have followed the same tutorial ... same here and they work like a charm. Its an extremely easy mod, plus I got 6 free ATXs ... makes this pretty hard to beat.

    EDIT: Here is the tutorial I used. Another member on here, can't remember who, recommended this one to me.
    Last edited by Imperialkid; 03-03-2012 at 12:09 AM. Reason: Added the tutorial I used.
    [IMG]http://www.vixenlights.com/sig/sig_h.php/320/All.gif[/IMG]

    Taking a Hiatus, but still in lurking status ... ;)

  3. #13
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    Default Re: Converted MiniATX Power Supply

    Quote Originally Posted by Wayne J View Post
    Using the -12 and the +3.3 should do that.
    I played around with this last night and i did finally get it to work (after causing the PSU to shut down a few times). I jumpered a resistor between -12V and +3.3V and between Ground and -12V and tested the voltages. I was a little surpirsed/curious though at where i measured the +15V at, it was on the resistor between the -12V and +3.3V posts. It has been a while since the DC circuits course that i had, but help me understand why it wouldn't have been +15 on either post to Ground?

  4. #14
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    Default Re: Converted MiniATX Power Supply

    Voltage is a difference of electrical potential so if you have one point at -12 and the other at +3.3 then the difference between them is what you would measure - or 15.3v (give or take). If you measure to ground from either supply you would naturally measure the difference between -12 and 0 or 3.3 and 0.
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  5. #15
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    Default Re: Converted MiniATX Power Supply

    Quote Originally Posted by budude View Post
    Voltage is a difference of electrical potential so if you have one point at -12 and the other at +3.3 then the difference between them is what you would measure - or 15.3v (give or take). If you measure to ground from either supply you would naturally measure the difference between -12 and 0 or 3.3 and 0.
    Got it! Thanks.

  6. #16
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    Default Re: Converted MiniATX Power Supply

    Hmmm.. but what of the current if the power supply says...

    -3.3v 2.0A
    12v 15.0A

    Does this mean you are actually limited to 2.0A @ 15.3 v??
    Standard Disclaimers apply:
    "Product may not appear as shown, your mileage may vary, I'm not a doctor nor do I play one on television, these are not the droids you seek"

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