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Old 1st December 2004, 06:55 PM   #21
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Quote:
It is intriguing that you are using the suggested noise filtering by MalichiConstant in you XO-3 circuit. (R14 and C7).
KWAK: Who is malichiconstant? I never heard of him .. let me explain: R14 and C7 is a normal RC filter.

Can you explain me, which part of the RC filter you find intriguing? The R or the C ??

And what does it have to do with this thread??? OK i will help you out on that one .. The next version of XO3 it will actually have an implementation of the 'lownoise regulator' on board instead of the AD. With a few other upgrades..... But no BG caps

cheers
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Old 1st December 2004, 10:13 PM   #22
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I like this thread
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Old 1st December 2004, 10:16 PM   #23
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Me too, except until now nobody has come up with any usable suggestions to improve the low noise regulator.
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Old 2nd December 2004, 09:21 AM   #24
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Question Power Supply Regulators

Hi, In the good old days Tom Colangelo came up with the PLS-150 supply for the Mark Levinson ML-1 preamplifier. We were shocked by the abundance of parts and by the fact it was not potted. I reverse engineered the supply and found it is somewhat similar to the PLS154 used for the ML-7 preamplifier of the same brand.
The PLS150 is not a dual-tracking supply and has two 1N5526 zeners that are filtered and one is used for each supply (positive/negative)
The PLS154 is using the same reference, also filtered and used as a reference for the positive supply. The negative supply is then obtained by inverting the positive supply with an unity gain inverting amplifier.
So far so good as I am inclined to believe Tom is convinced a dual tracking regulator is better than a conventional dual supply.
But the Mark Levinson company went down for about a year and Mark Levinson (the person) founded a new company Cello. His favourite engineer Tom moved with him. And what do I see as the regulator of the Cello Encore preamp? A LM317/337 STEEL (TO-3 case) from National.
Anyone can shed light on this?
Attached picture is of the PLS150 supply.
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File Type: jpg pls150-pictsm3.jpg (63.0 KB, 1204 views)
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Old 2nd December 2004, 09:47 AM   #25
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Quote:
Originally posted by Lars Clausen
Me too, except until now nobody has come up with any usable suggestions to improve the low noise regulator.
... so what do we have and what do we want to improve....? Does this regulator need to improve for what it is intended for?
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Old 2nd December 2004, 11:04 AM   #26
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Quote:
And what do I see as the regulator of the Cello Encore preamp?
This story is just too funny. Thanks for sharing.
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Old 2nd December 2004, 11:45 AM   #27
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Default Re: Power Supply Regulators

Quote:
Originally posted by Elso Kwak
Anyone can shed light on this?
They wanted probably earn money

It isn't important how high-end looks inside. The image is more important.

Elso, I see that you are away and you have a unknown return.... but you have been here ever since you wrote this
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Old 2nd December 2004, 12:42 PM   #28
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Red face Funny?

Quote:
Originally posted by analog_sa
This story is just too funny. Thanks for sharing.
Funny?
Is everybody funny here?
And your quote using my name is certainly out of context and does not apply to Nelson Pass, Fred, Jocko, Jonathan Carr a.o.

The examples I gave are not the whole story. The PLS150 supply is dead quiet and the PLS154 also which cannot be said of a LM317/337 setup. The latter is simply not quiet enough powering a MC-cartridge preamp.
I did see some extra circuitry around the LM317 in the Cello so maybe Tom Colangelo designed something along the lines of Fred' s suggestion........(Improving the LM317 regulator thread).
Here perhaps:
LM317-based regulated PSU: how does this thing work?
There also do exist many versions of the Cello preamp. I did not spot the LM317/337 in earlier versions.
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Old 2nd December 2004, 07:28 PM   #29
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Don't tempt me, bub...............!

Jocko
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Old 2nd December 2004, 09:16 PM   #30
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Jocko, he he i know it was slightly provokative of me but you are more than welcome to comment this regulator design, i always appreciate competent feedback.

Lars
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