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In Reply to: RE: PSU linear power -again! posted by GStew on October 29, 2010 at 21:06:00
Hi Greg!
I have checked up. The system board GA-H55M-UD2H does not start without +3.3V.
Tell me please why you attach foil slices on capacitors and SATA cable?
Edits: 10/30/10Follow Ups:
Mihaylov,
Thanks for checking. Dang, it would have been a nice simplification to the linear supplies.
As for the foil-ish things, those are damping materials.
I'm very big on vibration control.
I can't say that I heard any diff from the material on the SATA cable.
And didn't try those caps with and without.
But other cap, case, and heatsink dampings have been very audible. Additional damping on my amps (on the clips that attach the devices to the the heatsinks) was what made B38 preferable to B37 in my system.
The foil-looking stuff is EAR material available from Michael Percy. I also use Dynamat. I generally prefer Dynamat on cases & the EAR mtl on components.
On my linear supply, all the caps, transformers, and rectifiers are damped. Also the structural materials were chosen for vibration control... bamboo mounting structures with brass hardware (no steel hardware anywhere in supply). Bamboo bases were also damped with combo of Dynamat Xtreme & regular.
My Zalman case is also extensively damped, as are my other supplies and the heatsinks on the motherboard. Also my amps, my volume control, and speaker crossovers & structure.
Much more to try, but this has been a fruitful excursion over time.
Must listen to the effect when doing... when I damped the caps in the linear supply, first used Dynamat Xtreme... great clarity and extended & strong bass, but tunefulness was impared. Replaced with EAR damping, very slightly less clarity & bass, but very tuneful by comparison. And I hadn't expected any changes with that damping as the caps are already mounted to the bamboo bases with a resiliant double-stick tape.
Later!
Greg in Mississippi
P.S. If you haven't tried these, I can strongly recommend these two tweaks to your linear supplies:
1. Add another supply for providing the control voltages instead of taking them off the ATX-20/24 +5v.
2. Seperate the AC input to the P4 & peripheral supplies and take them to a separate AC circuit in your listening room as per cics recommendations.
Everything matters!
Thank you Greg! About two tweaks. I see second tweak and I think that is very interesting to try. But I don't understand first tweak. What is "control voltages" and why it is necessary to use a separate power supply unit for them?
Mihaylov,
Very welcome.
On that 1st tweak, the control voltages are the +5v for the +5VSB & the PWR_ON signaling.
When I first setup my linear supply, I saw that the motherboard didn't appear to need those voltages (along with the -12v) after it had booted, so I supplied them with a battery and turned them off after boot.
When I was troubleshooting why my system would not stay running, I decided to try to make those voltages permanent. I put in small AC transformers along with diodes, filter caps, and regulators for both the +5v control voltages and the -12v. Doing this fixed the issue with it shutting off randomly... and after we realized that the -12v was not needed for anything but the GA-G31M-ES2L board, I pulled that supply out.
Later, I thought it might sound better to supply the +5VSB & PWR_ON from the main +5v ATX-20/24 supply due to a simpler setup and grounding. When I wired that up, I lost some clarity and individualization of sounds. So I've gone back to the separate supply for _5VSB & PWR_ON.
The difference, while not huge, was very definite & positive.
BTW, I didn't notice any difference between supplying the +5v control voltages from the small AC supply or a battery, but the battery was only a 9v battery, so a better battery might be a different matter.
This leaves me with 5 separate AC tranformers in my linear ATX-20/24 & P4 supplies! Gotta lotta iron!
Later!
Greg in Mississippi
P.S. On the motherboard, the control voltages are separate from the main +5v ATX-20/24 line. When I lowered my +5v down to +4.6v or so, it didn't cross over to the +5VSB & PWR_ON.
Everything matters!
Thanks! I see.
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