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Old 9th July, 2003, 02:28 AM
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modding at/atx PSU for pelt PSU

im looking for a guide on how the heck to do this! i understand i wouldnt get the full potential from a 226w pelt with an old PSU that puts a small amount of amps on the 12v line, but it's worth a try and it's cheap.
anyone know of a guide to this?
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Old 9th July, 2003, 11:34 AM
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Location: Europe
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There's several ways of doing what you're trying to do. The best way involves fairly heavy modification of the PSU circuitry, totally re-wiring the output stages, and reworking the voltage regulation stage around the switching controller. This really requires an understanding of electronics and switching power supplies. More info can be found on DL2YEO's PSU mod page

If that's too much work, which I suspect will be true, you can try an alternative that doesn't require modding the PSU. Older PC PSUs are designed to regulate the 5V line, and just hope that the 12V line is in the right place. This being so, an electrical load of some description is required. Something like a car lightbulb is ideal, as it can draw enough current to make the PSU provide the required power. Wire said lightbulb across the ground and +5V line (black and red cables normally). The PSU should then provide a reasonable level of power on the +12V line.

However, be aware that some PSUs are not well designed. I have seen PSUs where the 12V line has had components that will not tolerate the maximum load stated (in fact, they just scraped past half way!). You may find that the PSU fails after a short period of time, depending on the components inside.

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Old 26th July, 2003, 07:30 PM
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chris4521, One of our own stigweed has used a second psu to run his fans,and all his drives . The link to it is here:
Poor man's solution - Adding power to your Power Supply!
I have seen postings where people claim to have done this and have it work, I have also seen cautions to make sure you interconnect a ground wire or two between the psu's. Here are some other articles:

I don't like the name of that page , but it looks legit.Or you could just ask our own Mr Mcfaul, I came across his site while Googling up " add at psu to atx psu". :
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