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Old 20th February 2009, 01:14 AM   #1
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Default Is there any "best" power supply design?

If you're looking for a regulated power supply to use in your passive buffer or a DAC you're building, is there any "best" power supply for each application?

I've looked at the Twisted Pear LCBPS and thought about using it in my Pass B1 but then I started researching and there are about a gazillion power supply designs out there.

Is there a point of diminishing returns where once you have a solid design you're just wasting your time trying to find a "better" power supply?
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Old 21st February 2009, 07:13 PM   #2
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Default Re: Is there any "best" power supply design?

Quote:
Originally posted by marc brown
If you're looking for a regulated power supply to use in your passive buffer or a DAC you're building, is there any "best" power supply for each application?
Of course there is. Every single one of the
Quote:
Originally posted by marc brown
gazillion power supply designs out there.
is the best power supply.

Quote:
Originally posted by marc brown
Is there a point of diminishing returns where once you have a solid design you're just wasting your time trying to find a "better" power supply?
Yes. And it is yours to decide, where that point of diminishing returns is.

From an engineering point of view it would be, where the power supply's ripple and other noise falls below either the hearing threshold or below the buffer's or DAC's own noise. And it would be sufficient to achieve only one of those goals. A true high-ender will of course not stop at that point, while others may be quite comfortable with a little audible power supply noise.
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Old 21st February 2009, 07:47 PM   #3
tinitus is offline tinitus  Europe
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http://sjostromaudio.com/_unsql/hifi/jsr06/index.html

Per-Anders have several regulated supply, from very small to bigger and expencive

Maybe also look at Borbely
If I have understood Borbely correctly the most regulated are rather simple 2-point, and he says it needs to be 3-point regulators...whatever that means

Question is whether a simple curcuit like the Pass B1 would be best suited with the most simple supply, trafo/rec/cap

As fore the best some would claim it to be battery, if thats convenient or practical
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Old 21st February 2009, 08:22 PM   #4
tinitus is offline tinitus  Europe
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What about using chokes

As I understand it they are not good fore SS poweramps, but maybe they would work fine with SS preamps and such
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Old 21st February 2009, 09:04 PM   #5
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Thanks for all the tips guys.

Here's something that I'd look at as overkill for a linestage buffer while I'd use it in a DAC.

I'll probably end up using something like the Twisted Pear LCBPS with my B1 implementation. I was going to use the toolereg but lost interest in it after waiting for a design to finalize. I found the schematic for the power supply in Nelson Pass' Aleph P but it's a lot more robust than I need.

I just want a relatively simple design that is sound and allows me to fine tune the output voltage via a trimmer pot.

link to twisted pear LCBPS
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Old 22nd February 2009, 11:43 AM   #6
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Chokes are fine in SS, its easy enough to wind your own air core chokes if desired.

Choke input supplies generally aren't very practical here though.

The gotcha with chokes are their radiated magnetic fields, this is especially an issue if you have an output transformer.
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