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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
Hi all
when I've checked the very low current of my new sandy bridge setup, I've got to think about a linear PSU based on Belleson superpower regulators.
My idea was to build a very simple scheme but with excellent components, one PSU for each services the transport needs, in a picopsu based system.
Picopsu was my choice for a lot of reasons, formerly for ripple non existent, for his management of pwr.on and of 3,3 V current.
So I've identified these services, each of them needs a single PSU:
1) picopsu current estimate 1,2 A
2) CPU (P4) current estimate 300 mA
3) Xonar 12 V current estimate 300 mA
4) Xonar 5 V current estimate 900 mA
5) general service 12 V ( high current up to 6 A)
6) general service 5 V ( high current up to 3 A)
As you can see first four PSU are "noble", last two the dirty ones.
Here we are the schemes:
high current ( 5 and 6)
the "noble" ones
the six PSU will be feeded by three trafo.
a) 230-15 V 80 VA two secondaries: one for pico, one for the others three "noble"
b) 230-15 V 50 VA two secondaries (in parallel) for services 12V
c) 230-9-0-9 V 150 VA for services 5V
The "nobles" were build using these components:
- Mundorf M-Lytic 4700 mF
- VISHAY-RODERSTEIN MKP-1837 Metalized Polypropylene Film Capacitor 0,1 mF
- Belleson Superpower high current
- ELNA Cerafine 100 mF
- Schottky diodes ultrafast
the dirty ones were build with regular components
My Zalman 501 case was so large to host all components of CPU with no problems, but the four "nobles" were assembled using an old ATX PSU case ( see pictures) just a bit difficult but neater.
I've decided for using a fan ( yes a fan!) in the ATX case because temperature of heatskin rise up 75-80 °C so to avoid large, heavy and too hot heatskin in the case, I've decided for this heretic approach.
Cabling was a little difficult, my choice of a so great number of single PSU means a great number of cables in the case.
I've Grounded each PSU from the negative pole of levelling capacitors, all convergent to the original screw of ATX case.
Results are astounding, I've never listen my system with a so beautiful sound , this is an hard work that worths every efforts.
Thanks to Theob for learn to me the existence of Belleson, they are really fantastic regulators. Just a bit expansive too......
And thx to all the guys that have give me a lot of ideas with theirs posts
Now I'm very happy
Daniele
Follow Ups:
Hi Daniele,
Are you using an external DAC with your Xonar, or analog outs from your Xonar?
Thanks,
Tim
Hi Tim
I use both, formerly the Xonar ONE with some difference:
- Full Burson opamp ( 7 'cause I use only RCA out)
- no output capacitors
- some little ceramic bypass caopacitors on the electrolytic on PSU
ONE is a great DAC, with a very good PSU, good ASIO driver and a gorgeous sound ( with Bursons opamp)
regards
Daniele from Nexthardware forum, cMP2 forum
Hi Tim
I'm using only analog output of my fully modded Xonar Essence STX.
My transport was thought in this way, I hate digital cable and more digital connections of cable! Xonar is a fantastic soundcard only if you change the original opamp with three Burson discrete dual opamp. It's easy ( use only the model with solid termination, not cable!) but very effective.
If you want another two simple step for a better SQ : bypass the output capacitors and feed the soundboard with a linear PSU.
Fantastic SQ!!
Daniele
Daniele, I am also impressed by your work! In my experience with cMP and audio reproduction as a "whole", it sometimes really comes down to using the best parts (Mundorf AG+) and best design (Belleson).
I find it very interesting, that Mundorf has chosen a similar technology as ELNA Silmic for its newest AG+ electrolytic caps (Manila hemp dielectric paper) as stated here on page 3:
http://www.partsconnexion.com/prod_pdf/mund_ag.pdf
This for damping the whole structure of the cap etc. In a sufficiently resolving system, minimizing vibration leads always to better sound IME, so try to use Herbies stuff, brass PCB standoffs etc.
I am using the Mundorf caps in my AD1852 DAC for rectifier smoothing and they sound remarkably better than Panasonic FC.
As for the belleson, after studying this thread over at diyaudio
http://www.diyaudio.com/forums/power-supplies/185763-belleson-superpower-ultimate-voltage-regulator.html
Its developer, Mr. Lowe has some interesting comments about measuring Superpower's noise, transient response etc... It seems this is really the best monolithic regulator available :-)
Btw, do you find the Cerafine at the belleson output better than Silmic, if you have tried? If you have some, try Oscon or similar solid polymer caps.
To quote GStew, "everything matters" ;-)
Picture: this is my current setup. I use Felix AC filters for both the dirty and clean PSUs... I plan to use a high current belleson for powering the pico, at the moment I have the peaktech 6080.
HI nagual19
I'm very happy for your comment about my "mad work".
Mine is an old audiophile story and the use of "good components" (on a good project, obviously) adds to music a little bit of magic that it's well worthwile.
After two weeks I can tell you the system is absolutely stable, no high temperature nor any problems at all and the sound quality.........is fantastic, better than using the Peaktech. Belleson are fantastic, they are expansive but transparency and dynamic are enhanced like never I've previous listened in my system.
About Cerafine , in my experience, they are less smooth and just a bit faster then Silmic, in a PSU building. I don't like too much OsCon, Elna ( Cerafine or Silmic) are superior, IMHO.
So I've build PSU with Cerafine and modded the ASUS Xonar Essence STX in a "all Silmic" fashion. I'm totally satisfied now, I'm listening for many hours every day without any fatigue but with a fantastic pleasure.
Thanks again to each guy that help me to reach this great result
Daniele
I apologize for this but my memory is going away!
Greg in mississippi (GStew)was the first that speaks about Belleson, I'm sorry.
Anyway my acknowledgements are for all forumers. This is a true community where knowledge is really available for everyone.
I'm proud to stay here
Daniele
I don't think it was me but thanks for thinking that. But, but this is fantastic work! I really admire you for your intellect, industry and results. Way to go. Wish I could hear this set up.
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