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Old 29th July 2004, 10:48 PM   #1
ecman is offline ecman  France
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Default Can you mod a computer power supply ?

I wonder if there is a way to use a PC PSU modded/or non-modded ?
Would it be better to had somthing on the amp board or to mod the PSU ?
Or even just use and reassemble some parts found in it ?
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Old 30th July 2004, 05:30 AM   #2
ir is offline ir  New Zealand
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short answer: no

long answer: yes, of course. BUT...

you will need a: an oscilliscope - this is non-optional. b: a LOT of patience. c: a reasonably high IQ and the smarts to know what's safe to do and what's going to cause a fire and d: some tools, a soldering iron etc

now that you know it's possible it's up to you. if you can't work it out, then it's probably best you don't.
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Old 30th July 2004, 07:32 AM   #3
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the ATX case might be useful to store parts in. it has a place for a plug built in...

now sure how you'd fit a transformer and heatsink in as well, but i'm sure it's possible.
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Old 30th July 2004, 07:54 AM   #4
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I think he means, can you use it to power the chips...right?

Well at the heart of it, it seems cool. I mean 12V at like 8-10A. But the -12V is very low, so you would have to make one of those fake negative voltages (like referencing the +12V and turning it into -12V).

I think most poeple will say the noise is too high, although the National chips are known for the there ripple rejection...plus would a choke help here? Actually don't most PC PSU's have chokes in them already?

Either way its tempting seeing a big PSU thats only like $30. Although 12V is low, a series/parrellel chip combo would give you increased output.
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Old 30th July 2004, 07:59 AM   #5
Vikash is offline Vikash  United Kingdom
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My first test amp found home in a psu: http://www.vikash.info/audio/gainclone/
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Old 30th July 2004, 08:55 AM   #6
MWP is offline MWP  Australia
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Quote:
Originally posted by Vikash
My first test amp found home in a psu: http://www.vikash.info/audio/gainclone/
Erm, i think you kinda missed the point of this thread.
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Old 30th July 2004, 10:19 AM   #7
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Hi,
I would not mess up with a switched mode powersupply. If if it works OK. If it breaks down, trash it!
Besides that you cannnot imagine how much noise this kind of supply generates.
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Old 30th July 2004, 11:39 AM   #8
gmarsh is offline gmarsh  Canada
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It's possible...

You'll have to tear out the rectification/output side of the supply, and remove and rewind the main transformer to have two output windings sized for 20 something volts instead of 5V/12V/etc. Maybe even another winding to power the control circuitry used. Then you'll need to put in new output caps, new rectifiers and new output inductors, and you'll have to invent a new feedback/control loop for the supply so that it's stable and putting out the correct volts.

With enough filtering and attention to detail, you can make a very clean switching power supply. Making such a supply out of a computer supply isn't going to be easy, though..
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Old 30th July 2004, 03:09 PM   #9
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Default Linear PC supply

Once I had an idea to build an external linear power supply for my PC, as at least the internal environment would be free of RFI. The switching design is very bad for audio, at least at such low pricing.

Has anyone tried such a thing? Is it worth it?


Carlos
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Old 31st July 2004, 09:05 AM   #10
MWP is offline MWP  Australia
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Default Re: Linear PC supply

Quote:
Originally posted by carlmart
Once I had an idea to build an external linear power supply for my PC, as at least the internal environment would be free of RFI. The switching design is very bad for audio, at least at such low pricing.

Has anyone tried such a thing? Is it worth it?

Carlos
Not for the PC its not worth trying.
Even though the power source may be smooth, the switch-mode psu's on the motherboard and other hardware will chop it up quite badly.

Best you can do is only supply the soundcard with a decent linear power source (cut it off from the PCI power source).
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