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Original Message

Another Goldberg's variation on linear PSU theme ( with Belleson regulators)

Posted by audiodan@tiscali.it on June 19, 2011 at 16:12:21:
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