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Want to Comission: PSU for amp

post #1 of 9
3/27/09 at 7:02am
Thread Starter 
I have a Single Power Square wave with this as its PSU:



I'm looking for someone who can build a replacement that will perform better. I also want it to be 220V.

Budget: around $300 but may can stretch a little.
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post #2 of 9
3/27/09 at 3:46pm
I see a Sigma22 + Sigma11 in your future

Just gotta find out whether which between Pins 3 and 5 is earth ground and which is the voltage reference.

Would be also very nice to know whether the +5 is actually used in the amp as a +/-12V Sigma22 will be considerably cheaper than both.
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post #3 of 9
3/27/09 at 9:38pm
right - the use of those rails will tell how 'good' they need to be.

if the 5v is for digital and control stuff (I do that lately) then its not 'important' enough (imho) and you can get with with a 3term regulator. put the money, I would guess, in the 12 rails.
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post #4 of 9
3/27/09 at 10:42pm
Found the pinout on this page - https://www.mpja.com/prodinfo.asp?number=16166+PS

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post #5 of 9
3/27/09 at 10:46pm
Thread Starter 
Thanks guys. I was quoted $700 by one of the professional builders for a sigma22+sigma11 before which is far beyond my budget. Is sigma22 the only DIY dual rail power supply?

Is there any way that I can check if the 5V is being used or is unimportant?
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post #6 of 9
3/27/09 at 11:12pm
Total parts and chassis cost for this project is around $250.

Custom work isn't cheap of course.

I'm wandering, is the 5V even used? I can't imagine why a solid-state amp would require it. Is there a DAC in there as well?
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post #7 of 9
3/27/09 at 11:18pm
Thread Starter 
No, there is no DAC. I'll post some internal shots later.
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post #8 of 9
3/28/09 at 1:28am
Thread Starter 
Here are some photos. It looks that the 5v might possibly not be connected to anything.



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post #9 of 9
3/31/09 at 3:21pm
Damn, still no traces from pin 1, can you please take a photo of the other side of the board. I'm VERY skeptical that 5V is used for something and it'll save you quite a bit of cash to skip the Sigma11.
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