Sunday, August 8, 2010

AT PSU issues

yep the AT PSU i bought in calgary has issues, has soon as i put a load on it, it shuts off, and all i used for a load was just a 60mm 12v fan, from a computer.  the shop i bought it from said he was not sure if it was in working order, but he will try to get me another working one if this one did not work.

2 comments:

  1. Have you put a load on the 5V rail? If you don't it can't give 12V without the 5V rail going over voltage, so it will either give a low 12V or shutdown. There is only one regulator for all the voltages inside a cheap PC PSU.

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  2. Yup seconded,SMPSU's have a minimum load below which funny things happen. I use a low value power resistor tie wrapped onto a piece of aluminum sheet as a dummy load.

    Your fan being an inductive load and not on the power rail that drives the regulation will have made the situation worse.

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