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Old 25th January 2013, 10:47 PM   #1
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Default PC PSU for [in PC] Audio use

I did search but came up empty...


Who has actually a switching PSU for audio [in a PC]?

[ie tap off the +- 12V rails]


What problems arose?

How did you solve them?

Can you share the audio circuit or describe it?

Thank you!
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Old 26th January 2013, 09:47 AM   #2
AndrewT is offline AndrewT  Scotland
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I want to do similar. I have a 500W PSU that looks OK internally.

Remove the -12Vac and remove the +5Vac windings from the main transformer.
Double the number of turns of the +12Vac winding to get ~+24Vdc from the output.

I would like to know how to modify the PSU to achieve this.
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Old 26th January 2013, 09:52 AM   #3
oz7aff is offline oz7aff  Denmark
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Try the HAM Radio world, they are rebuilding lot's of PC PSU's to feed transmitters and recievers and they also want no noise.

@AndrewT, a problem with you'r idea could be that the 5VDC often is the main circuit in these PSU's.
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Old 26th January 2013, 09:12 PM   #4
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Quote:
Originally Posted by oz7aff View Post
Try the HAM Radio world, they are rebuilding lot's of PC PSU's to feed transmitters and recievers and they also want no noise.

@AndrewT, a problem with you'r idea could be that the 5VDC often is the main circuit in these PSU's.
There is no way that I would to mess around with the internals of high power PSU - you are a braver man than me Gunda Din!

I wanted to tap off the +- 12V rails to power a 'booster' amp - sometimes the audio signal level is just too low on my PC, and want to amplify it - put a X20 op-amp between the audio card output and speaker/amp system.

I have heard talk of interference and noise associated with a switching PSU but few people actually seemed to have tried it.
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Old 26th January 2013, 09:23 PM   #5
oz7aff is offline oz7aff  Denmark
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I have a RIAA amplifier build into my PC, the power supply for it is taken from the +12VDC rail in the computer, I have inset a 100uH coil in the power lead and it reduced the noise to a very low level.

RIAA-PC-PCB-MONT
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Old 26th January 2013, 09:30 PM   #6
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Quote:
Originally Posted by oz7aff View Post
I have a RIAA amplifier build into my PC, the power supply for it is taken from the +12VDC rail in the computer, I have inset a 100uH coil in the power lead and it reduced the noise to a very low level.

RIAA-PC-PCB-MONT
Thanks 'OZ'.

I was thinking/hoping a pi filter (2 caps, say 0.68uf, in series, with a choke between them) might do the trick. Good to know that just a choke worked, especially with a RIAA amp.
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Old 27th January 2013, 01:33 AM   #7
gychang is offline gychang  United States
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this guy converts PC PS to just 12V and plays car stereo at home. How to hook up Computer Power supply CPU to Power a Amp & Cd Player.. SO CHEAP AND EASY - YouTube

gychang
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Old 27th January 2013, 05:38 AM   #8
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Thank you! Sadly though - I reside in mainland China - YouTube is blocked here. So I can not see the video.
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Old 27th January 2013, 08:13 AM   #9
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I have not tried to use any newer pc power supplies but the older ones regulate off the +5V rail and need some load on this, the +12V rail is unregulated and the -12V rail is low current provided by a 3 terminal regulator only 0.25 or 0.5A as it was mainly to power serial ports
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Old 27th January 2013, 08:19 AM   #10
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I believe that is true for the new PSUs as well - they need a load.

Perhaps I was not clear .............. I intend to use the PSU inside the PC .... not stand-alone, to power a dual op-amp to boost the existing PC audio.

I did not know that the +12V was unregulated.........should be ok, else use a simple transistor/zener reg [say for 9V]................ -12V at 0.25A is still ok for me!

THANK YOU!
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