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Old 7th July 2009, 08:45 PM   #1
geminni is offline geminni  Yugoslavia
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Default Diy Silent PC Power supply

Hi!

I want to make my PC power supply quiet
I don't want to by a new one I want to make one by adding a bigger heat sink and lowering fan's voltage.

The heat sinks in supply are two plates, almost with no fins. I want to replace them with one that is 9x3,8x3,5cm there are 9 fins that are 3cm long. I believe that these are much better than the one in supply.
The heat sink i used is some old processor heat sink cut in half, so that is why now i have one with 8 fins and one with 9 fins.

Because of the small space for supply i want to fasten the new heat sink on back side. By doing this i will have to remove all the transistors (there are 3 by heat sink) and connect them again with board with wires that will be long about 3 cm. Will that make some trouble, like oscillations?
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Old 7th July 2009, 10:19 PM   #2
star882 is offline star882  United States
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It looks like a very cheap power supply. A good one doesn't cost that much.

http://www.newegg.com/Product/Produc...82E16817104951
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Old 7th July 2009, 10:48 PM   #3
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It's been done successfully before, but the only way you will know is to try it. Don't mind this star character, "she" is a forum bot.

You might want to leave the cooling fan on the power supply, and undervolt it. The transformers and capacitors will thank you.

-David
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Old 8th July 2009, 04:06 AM   #4
star882 is offline star882  United States
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You cannot just extend the wires on switching power supply components, at least not without considering what effects the added capacitances and inductances would have. What you could do is move the components to the other side of the board (which you remount on standoffs) so there'll be enough clearance for the new heatsinks. Or just epoxy the new heatsinks onto the existing heatsinks if there'll be enough clearance.

Do realize that it looks like a poor quality power supply based on the size of the components used and the lack of input inductors.
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Don't mind this star character, "she" is a forum bot.
Question my authority if you like, but if you do, I'm sure someone else knowledgeable would agree that's not a good quality power supply.
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Old 8th July 2009, 10:11 AM   #5
wwenze is offline wwenze  Singapore
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Get a new power supply that is silent to start with:

http://www.silentpcreview.com/article922-page5.html

http://www.silentpcreview.com/Silverstone_ST45NF_PSU

http://www.silentpcreview.com/section10.html

A few power supplies of today have noise levels below 20dbA @ 1m. At that noise levels, the HDD is going to be way, way louder.

You can make it quiet yourself. But will it be worth your time effort and safety. Having a slower fan (recommending fan swap as what most PC silencers do if they mod their PSU) and bigger heatsink will lower noise levels, but while your transistors may stay the same temperature, the air temperature in the PSU will rise. And that is not good for the capacitors, which are major causes of failure from aging + heat.
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Old 8th July 2009, 03:01 PM   #6
geminni is offline geminni  Yugoslavia
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Thank you for the suggestions Maybe buying the new one is going to be best for me.

I wanted to try if I can make it diy like all things i do, amplifiers, speakers, furniture....
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Old 10th July 2009, 06:18 AM   #7
Eva is offline Eva  Spain
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That power supply is very low quality and doesn't even deserve the effort. It doesn't even have an EMI filter (probably an illegal Chinese import with fake safety and EMI certifications). Buy a new one, and for some extra money it can be silent enough.

Some mass produced stuff like PC power supplies is so cheap that it's not worth messing with.

BTW: Save your heatsinks for some amplifier project
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Old 10th July 2009, 06:52 AM   #8
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The scary PC supplies I've seen didn't even bother with faking the safety certification. I usually see them in cheap case + power supply combos. I buy the good-looking case, then strip out the power supply and put in something decent. Usually a good sign is a brand name that I recognize (SPI, for example - a second-tier supplier, but at least they make the effort to provide real safety certification and decent heat sinks). The most humorous off-brand name I've seen so far - Austin Power (the power supply didn't try to shag me, but it eventually blew up - I think the standby supply bit the dust)....
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Old 10th July 2009, 09:31 AM   #9
luka is offline luka  Slovenia
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And if you buy new one, get one that has 12 or 14cm fan, those are silent, you won't hear them..
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Old 10th July 2009, 09:49 AM   #10
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Just be aware that most of the noise is made by HD , not the PSU.
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