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In Reply to: RE: cMP - the open source high-end Memory Player posted by cics on December 30, 2007 at 05:42:01
and not terribly complicated and, best of all, affordable.
Mr. Salas has been working with this shunt reg design for quite awhile, mainly for hig voltage circuits. He offered this one for something near and dear to our hearts, a five volts, just under three amps, design.
I have begged, and I am hoping for assistance, on how to make it just a little "bigger", we'll see if he responds.
Look at post #36 here: http://www.diyaudio.com/forums/power-supplies/168631-5v-high-current-low-noise-regulator-4.html
I have many of the parts laying about that were intended for a FIRST WATT F-5 build that I gave up on when the J-2 came out; got one of those instead, so I am definitely going to make one of these.
The only downside to this reg, and that is debatable, is that it cannot correct for line voltage variations, no feedback loop. If you live in an area with large fluctuations this might not work.
Hope it works better than the USB monitor.
Follow Ups:
Maybe if I wrote smaller posts, people would read all of them...
Rick, back when we were sparring about chokes in early August, I wrote this post:
http://www.audioasylum.com/forums/pcaudio/messages/7/77866.html
Where I said:
"But ultimately I plan to go to current-sourced shunt regulators. I have heard from one of my 'tweak mentors' that cascading series regulators does not sound good (in his humble opinion), so except in one position, I haven't done that. But CCS-sourced shunt regulators, such as the Burson, the Tent, the OPA, the Borberly, and the DIYAudio Salas (and other) ones are ok. This link I posted in an earlier conversation:
http://www.diyaudio.com/forums/power-supplies/168631-5v-high-current-low-noise-regulator.html
Is for a variant on the Salas design for high currents and what I intend to try after the LT3080 for the ATX-20 5v & P4 12v regulators. I expect the only thing that will be better are Paul Hynes' regs, which may be next after that."
Not trying to be snooty, but I've been trying to point this out for some time now... that wasn't even the first time I linked it.
I think it will be a VERY good option!
Greg in Mississippi (maybe my shortest post EVER!)
P.S. It's worth a question to Salas, but I suspect the diode pair/2SK170 bias string/reference will hold it to 5v pretty well.
Everything matters!
It is accepted that the shunt regulator is the way to go by most. The problem is that the shunt regulator is very inefficient and not easily procured. For the five volts line there is not much choice either - for the power needed you are stuck with the LT1083 or paralleled smaller power "three pins". None of the "super" series regs can handle the power, either, so the choices have been few and unexciting.
The point was, since I know I have no idea how to begin, how does one come up with one? I have looked for years for something that would work better than the ubiquitous three pin regulator and could not get myself too excited about building a supply with them
Hynes seems to be too busy, and, unfortunately, too expensive. I had asked him about this four years ago. He never came up with a proposal. And, to repeat, if he did it would cost more than I want to spend. His regulator, since it contains an error amplifier would be more accurate in keeping a steady voltage but I am not that sure that that, for my application (having a steady AC line) is as important as it may be for those who live in dense urban areas.
This circuit is elegant and simple, fourteen parts, scalable and has the benefit of many other hobbyists having built it in its HV form.
Just needs a LARGE heatsink more than anything else.
For the record I posted a reference to HYNES shunt regs before you even were involved with this forum. So maybe I am being snootier than you?
When I got my reg for the RAKK DAC we discussed this and he started buying parts for the first generation GIGABYTE set-up which he has never put into operation. He has not been able to get himself interested in doing this.
As usual, I do not doubt his reg is better than the SALAS, the question is how much better? If one has an unlimited budget, go for it - but, I think one can find better, and more productive uses for money in maximizing enjoyment of their music system. Of course, I wish I had an unlimited budget ...
Bye,
Rick McInnis
Sorry, I guess I was a bit snooty.
It was just that I've been trying to point out that high-current shunt regulator by Salas for awhile and noone seemed to notice.
On Hynes, I thank you for posting about him back in the early days of cMP. I hadn't heard of him before your mentions. I don't know if you saw the interview of him here:
http://www.hifizine.com/2010/06/paul-hynes-design/
He shows a picture of an ATX power supply that he'd done for a well-heeled computer audio enthusiast... When I inquired, he said "The SR2xr4 costs £1350, with silent transformers, fully built and tested." So that's one option.
So I guess that we're in violent agreement that the high-current Salas regulator will be a good option to try and likely the next-best thing to an all-singing/all-dancing Paul Hynes setup. I've got most of the parts for one here too, but it may be awhile before I put it together as I won't have sufficient space for the heatsinking required until I build a new case for my cMP.
And if you've followed some of John Curl's & Charles Hansen's comments about regulator circuit design and implementation, you might think that the Salas may have some chance of bettering a feedback regulator.
Later!
Greg in Mississippi
Everything matters!
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