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I Hacked a PSU Answered

So I replaced the cheap power supply on my Compaq so I could upgrade my video card. Anyways I'm left over with this 200W PSU and I have no use for it. I opened it up and I see components galore and a 80 MM fan. There is also a bridge rectifier and, some really big transformers, and two giant blue capacitors @ 200v, 470uF. Do I have to remove the PCB to discharge the caps before I start salvaging or is there a better spot. The Chinese that made it also made use of a lot of white hot glue. And the soldering on the PCB just looks plain bad. You guys have any thoughts of what I could do with it? Besides the lab powersupply instructable?



9 years ago

>really big transformers

In a switching power supply ? I'm not specialist of power supplies, but the one I open never hade any huge transformer.

>If powered it with 12v instead of 5 would that damage it ?

No, it is common practice to undevolt fans when you don't need a big airflow, because 1/2 fan speed = 1/4 fan noise, and 12V fan are standard, which means it is cheaper to buy 12V and undervolt it than to buy a slow / low noise 5V fan. So has been built to run at 12V, if that is what the sitcker says.

I rewired my expansion slot fan today. Its pumping out a lot more air and there is a slight noise like there is a piece of gravel in the fan but I guess that is normal. Shortly after I started my comp there was a really loud fan that turned on then stopped. I guess its my video card. Not much increase in noise, just the sound of air being wooshed out of my comp.

yes! 1) no, you can discharge the caps by leaving the fan plugged in and jumpering the green and black wires in the mobo power cable (atx 20+4). you can: auxillar psu for pc use it to power a car fridge indoors projects that need 12 and 5 volts, like tank battles.

I noticed the fan is rated for 12v but its only being powered with 5v. I noticed the same thing for my expansion slot fan also. If powered it with 12v instead of 5 would that damage it ?

Sometimes this is done to cut down on noise - a 12V fan at 5V is cheaper and similar in air-flow to a special "low noise" 5V fan... (or something.) As for "really big transformers" - kids today! They don't know what a "really big transformer" looks like...