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Old 1st April 2012, 08:18 AM   #1
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Default High quality PSU kit for analogue stage of a DAC?

Can someone recommend me a high quality PSU kit for a analogue stage of a DAC?

I need a PSU for I/V convertion and output stages? Should I use a dedicated PSU for each stage? Will a single PSU be enough for my DAC?
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Old 1st April 2012, 08:50 AM   #2
qusp is offline qusp  Australia
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Quote:
Will a single PSU be enough for my DAC?
no, well not IMO. you should separate power supply and grounds for the analogue section, digital section and clock domains. the analogue section may include the analogue reference pin for your dac chip if it has one and clock can be described as analogue, but i would keep the clock on a different leg personally
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Old 1st April 2012, 09:26 AM   #3
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Hi Qusp!

I'm performing some modifications on my Minimax DAC. The first step was tube and op-amp rolling. Actually, I'm trying to find the best op-amp combination. The next step is going to be a replacement of signal path caps and afterwards PSU modding.

I wouldn't like to "sell my kidneys" to complete the modifications, I'm just after cost-benefit mods that bring worthwhile outcomes. I am wondering if a dedicated PSU kit for the analogue stage, like Audio-GD's, would improve the Minimax performance.

Unfortunately, the case is quite small and there's no space for many PCBs nor additional transformer. Maybe, there're enough space for up to 2 PCBs.

If I adopted a PSU kit for the analogue stage and keep using the on board PSUs for all other stages, would this modding bring a high sound improvement?

Last edited by Audio Maniac; 1st April 2012 at 09:31 AM.
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Old 1st April 2012, 09:32 AM   #4
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Qusp,

Can you recommend a PSU kit to perform the referred mod?
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Old 1st April 2012, 02:51 PM   #5
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Originally Posted by qusp View Post
you should separate power supply and grounds for the analogue section, digital section and clock domains.
One note: Separating the ground is the worse you can do. The digital and analog ground are tied toghether inside the DAC, you need a good outside ground to connected them. Sure, star grounding is needed for the rest of the system, but ultimatelly is the same ground.
See at page 7:
http://www.analog.com/static/importe...als/MT-031.pdf
Separating positive rails is all you can do. Either by dedicated PS or by ferrite beads. Local decoupling capacitors are a must and make more difference than the PS themselfs.

Last edited by SoNic_real_one; 1st April 2012 at 02:56 PM.
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Old 2nd April 2012, 03:41 PM   #6
qusp is offline qusp  Australia
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sonic, yes of course its connected I could have been clearer there I suppose.... . they should have separate PSU and separate dedicated return/ground buses/connections to star ground. tie all digital together and all analogue together and then tie it all together at one point and one point only. how exactly were you thinking i was going to separate the grounds in an absolute sense?


Audio Maniac, no there is no kit, do you need the power suplies to be finished units or are you prepared for putting them together from scratch with a PCB, a schematic and a bag of parts?

Last edited by qusp; 2nd April 2012 at 03:43 PM.
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