WOOT! I'm not sure if this has been posted yet. A way to quiet the fan & adjust voltage!
I was working on my HP 575w 12v supplies and came across this page -
https://sites.google.com/site/tjingu...projects/HP47A
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Apr. 30th, 2013 - Been a long time since I have edited this page and thought it was time to add a few things. When I posted this project little was known about these PSUs. When we started using them we simply tried pins until they worked. Now we know the pin-out and there are many more interesting things you can do with these guys. For starters, we found that shorting pins 6-9-10 together powered them on. Unfortunately pin 9 can be used for adjusting the voltage. Shorting 6-8-10 also turns them on and leaves 9 open for use. Putting a 1K ohm pot between 3-9 allows for output voltage adjustment up to 13.8V. Shorting pins 4-8 will lower the fan speed but the PSU can still raise the speed when needed.
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I just connected 4 to 8 (using 6-8-10 to power up)(so I connect 4, 6, 8, and 10 all together) and lone behold the fan didn't ramp up yet I still got power!
I haven't loaded it up yet to see if the fan turns on when needed. I'll report back if I can
And just extra reading- this guy's page on putting them in series -
https://sites.google.com/site/tjingu...ts/diy-24v-47a