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Old 4th July 2012, 10:47 PM   #1
altmail15 is offline altmail15
diyAudio Member
Join Date: Feb 2011

HI guys!

I'm pretty sure that many of you have good designs for a power supply but what I'm looking for is some help on a high end psu that can output clean and slable 35 vdc.

Any sugestions or designs. I'm planning on something with 100.000 microfarad storage and a 600 va toroidal transformer, quality components all around, good board, goold solder and careful and criterious craftsmanship applied from project to the flick of the switch. Component sugestions are welcome too.

Tank you guys in advance.
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Old 5th July 2012, 05:50 PM   #2
altmail15 is offline altmail15
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Join Date: Feb 2011
Default Goal - Quality PSU for Dx Blame

I am sure this is a very useful topic to the community and many people have the need for a power supply like this to build their power hungry amplifiers. I still hope to have some feedback from the DIY community. The goal is to provide a DX blame heavily modified with a quality power supply.

Any quematics?
Any layout?
Any help?

This is a versatile device so the better the power supply the more people can use it in their projects.

Many people have now assembled dx blames but I refuse to use the recomended power supply because it does not make the amplifier justice and was designer too much on the low cost approach. I believe blame can be built using good parts and when fit to a propper PSU can go very high in quality.
I'm sure that not everyone tried to build their PSU based on a junk yard right?
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Old 6th July 2012, 04:50 PM   #3
Ian Finch is online now Ian Finch  Australia
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Location: Coffs Harbour
Comments about the DX Blame should inform which version - there are many with various or even no specific PSU details.

The OP is not a well informed criticsm of the Blame, other DIY amps or even commercial amplifer PSUs in general, since the vast majority also use such simple non-regulated DC supplies for very good reasons of efficiency, size, cost, performance and excess heat generation. This includes very expensive "high end" amplifiers too.

The rationale being, that it is far more sensible and cheaper to build an amplifier that is "high end" than it's power supply. In fact, good PSRR performance of the amplifier negates most needs to make the DC supply like a virtual truck battery, regulated or anything special at all.

It seems some folks need to read a little for their education here, as to why a forest of low ESR caps or extreme values of any power supply electrolytics make more problems than solutions or why very few use linear regulated supplies or a room full of car batteries for their power supply. These stem from simplistic notions of what "high-end" supplies might be but with proper attention to the amp. design, this audiophoolery is easily seen to be redundant or inferior.

In any case, we are free to build power supplies of any type that pleases us - just don't assume without proof, that they will be appropriate or always perform better than standard just because they are promoted as "high end".
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Old 6th July 2012, 05:12 PM   #4
altmail15 is offline altmail15
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Join Date: Feb 2011
Default Quest for knowledge

My appologies, I should have mentioned it was for the DX blame ST, nevertheless I still said 35 vdc so its not that important anyway.

I was looking for specific DATA not the litle I got in return, it doen´t look targeted at my questions/doubts.
When I said I was looking for high end psu I didn't mentioned nonsense in fact I didn't mentioned much, I was hoping to receive new ideas that are mostly out or good proven projects or experimentation.
As for regulation, I never said a word.
100.000 microfarad its a value that I tested before and I loved the results, I guess this offends people, I don't know why. It all depends on the way we choose to do this, there are hundred of ways to assemble the same 100.000 microfarad storage bank. In fact high end devices are usually big because of their power supply, am I wrong? Its usually the most expensive part of an amplifier and they (scientists and commercial amplifiers) do use it for many reasons, being stability the biggest argument I guess. I may say transofrmer regulation only comes in big transformers and its a very important parameter to look after.

I was looking for advice on components, in fact, I still do. I never said I knew it all and ideas change as we learn and experiment some more. Reviews are allways nice right? I'm planning to get some.
I was looking for alternative squematics that might also fit the Dx blame ST.
I'll continue learning but I guess not the way the previous post recomended.
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Old 6th July 2012, 05:27 PM   #5
bear is offline bear
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Location: New York State USA
My view is that relying upon PSRR of the amplifier circuit has real world limitations - under dynamic conditions especially. Might be fine, might not.

Up to now I am not a fan of regulators in general, especially for power amplifiers. All the amps I have heard with them have sounded for lack of a better term "dry" and "lifeless". No reason for that, they just do. If they sounded otherwise I might be a fan of regulation for power amps, or at least experimented more with that.

This includes tube amps...

In the end one is listening to a power supply running a speaker.

Although it happens very quickly, at audio frequencies, it is somewhat self evident that when one half of the output stage is fully on, or nearly so, it is merely dumping whatever is on the PS rails to the speaker... (yeah, so regulators should sound better fella, right?) ...so the case can be made for the best PS one can muster.

My personal view is that the less Idrop (current) to the output stage, and to the speaker the better... that also implies less Vdrop. So if the PS sags under load, you get a gain change commensurate because the FB sees that as an amplitude drop... and yeah, FB should cover it up and it should make no difference.

I dunno, it seems to matter most on complex passages at reasonably high levels - the clarity, spatial definition and the like holds together without strain when the PS is doing the "right thing".

100,000ufd is fine by me.
I used more in my Symphony No.1 amps... hard to do that today, big caps are hard to find, and very very pricey.

My personal opinion is that for a class B or AB amp that the dynamic capabilities of the PS and the regulation are an important factor to consider. More costs more, but may be worth it.

Ymmv, of course.

http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- every once in a while I say something that makes sense... ]
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