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RE: Suggestions welcome for modification U1 voltage regulator on the Juli@ digital part.

Mark,

A quick note here and I'll try to get a longer one out later this week.

I haven't verified this experientally, but my current thought is that powering the Juli@ 3.3v from a source other than the motherboard is more important than upgrading the regulator type. I suspect that a good separate source with the stock regulator will outperform a great regulator with MoBo power.

The LiFePO4 cell setup is the easiest way to do this, with the drawback of regular recharging. And I think that a good AC-powered setup will yield comparible results, but again I've not compared & verified.

It is a bit of a pain to provide separate 5v power to the Juli@ digital section... You have to cut the appropriate PCI connector contacts. But providing separate input to the 3.3v at the regulator is pretty easy and a very good initial step.

On regulator types, I'd agree with AudioDan that the Belleson is a step above the Dexa... Which is likely a step above most anything else available commercially. I suspect that Paul Hynes' regs will be right up there with the Belleson, but again haven't compared them yet (Yet... I am setting up a Buffalo-II/Juli@ combo for myself that will have a socket for that regulator so I can compare different types along with batteries and also power it from a separate source than the already-separate-from-the-motherboard 5v supply I normally use. I have Dexa, Belleson, Hynes, LiFePO4 batteries, and some Salas-like shunts to try. May have some results on this in early fall. I am very curious how this comparison will shake out and might get an AMB Sigma to add to the mix.)

An interesting set of threads with some good info on regulator setup, associated grounding, and use of batteries are in the Paul Hynes section in Audiocircle... See them here:

http://www.audiocircle.com/index.php?topic=96691.msg969288#msg969288

http://www.audiocircle.com/index.php?topic=89251.msg915659#msg915659

http://www.audiocircle.com/index.php?topic=77455.0

Based on his comments, a battery setup with a regulator might be the ultimate here.

Later!

Greg in Mississippi
Everything matters!

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