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Old 29th March 2004, 10:08 PM   #1
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Default Building power supply for master clock questions

Hello,

I am going to build a dedicated supply for the new super clock in my NAD C541I.

Is it better to build a regulated supply?

Also, what VA rating should the transformer be?

Thanks

KevinLee
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Old 30th March 2004, 03:39 PM   #2
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Hello,

What I had in mind was the following:

-Transformer, bridge, filter caps

or

-Transformer, bridge, filter caps, regulator, more caps.

I suppose a regulated supply is the way to go but I would like a second or third opinion.

Thanks

KevinLee
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Old 30th March 2004, 03:45 PM   #3
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While unregulated supply may sound better, it may be difficult to obtain accurate voltage.

I can recommend AN8005 regulators from DK. I tried them and they sound very good. Experiment with different caps values, as I found that smaller ones usually sound better. I wouldn't go more than 100u after regulator .
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Old 30th March 2004, 03:58 PM   #4
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Hello Peter,

Thanks for the info, I checked DigiKey and the regs are in stock.

Can you help me out and make a suggestion for a transformer from Digikey?

I was thinking of using either 1000uf Nichicon Muse KZ or 3300uf Elna for Audio caps as filter caps and 100uf Blackgate or 100uf Elna Silmic as cap after reg. What do you think would be better?

One final question, for the bridge I have Fairchild fast switching soft recovery diodes, will this be OK in a digital supply or should I use something else?

Thanks

KevinLee
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Old 30th March 2004, 04:08 PM   #5
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I found that MSR860 (OnSemi) work much better than MUR860 in digital supplies.

All my observations here are with regards to CS8412, but I think it should work similar with a clock.

The best bypass on the chip was BG N. I tried 33u, but it seemed too much; 10u or 4.7 was much better choice.

Those small Tamura transformers (from DK) should be more than enough 12VA (MT11xx).
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Old 30th March 2004, 05:05 PM   #6
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Peter ,have you tried Vishay/Telefunken Soft Recovery type
1A/1000V?

Parts Express has them.I just ordered a bunch.
Will compare to MUR860 in my preamp.

Bartek
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Old 30th March 2004, 05:10 PM   #7
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No, I didn't.

But yesterday I tried adding a second battery to my DAC (one for DAC, one for receiver; 6V) and the improvement in sound was substantial, much better bass (which was already very good), better definition and separation, highly recommended.
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Old 30th March 2004, 05:16 PM   #8
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There's an idea,

Should I try the clock of a 6v battery? Or is there a draw back to this?

Thanks

KevinLee
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Old 30th March 2004, 07:23 PM   #9
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I usually use 5V low drop reg. after the battery and it seems like battery power is always better than AC raw supply (especially with digital). Again, AN8005 is very good here.
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Old 30th March 2004, 09:29 PM   #10
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Again, AN8005 is very good here
Do you know any other source of these?

Other than Digikey.

Bartek
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