The simplistic Salas low voltage shunt regulator - Page 451 - diyAudio
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Old 23rd October 2011, 11:01 AM   #4501
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For squeezebox, better to supply 1.2 and 3.3v separately, by replacing the regs on the squeezebox pcb.

If you search on the slimdevices forum, there are some posts with current draw. I think peak 350ma on the 3.3v supply.
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Old 23rd October 2011, 11:22 AM   #4502
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Quote:
Originally Posted by studiostevus View Post
For squeezebox, better to supply 1.2 and 3.3v separately, by replacing the regs on the squeezebox pcb.

If you search on the slimdevices forum, there are some posts with current draw. I think peak 350ma on the 3.3v supply.
Yes, it's technically (theoretically) much better, as it's true that the use of a super fast/ super low output resistance like Salas Shunt reg loses most of its interest when the 9V is actually supplying std quality linear Regs inside the squeezebox !
It's a totally different job however as it requires messing with the squeezebox internals and means finding a new casing....

...on the other hand, I always have doubts on the effect of better supply to power digital circuits anyway , and changing the stock 9V supply by a better (linear) one has at least the advantage of avoiding injecting high frequency junk into the squeezebox.
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Old 23rd October 2011, 12:25 PM   #4503
Salas is offline Salas  Greece
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We did have a reference on the Touch if of any interest.
http://www.diyaudio.com/forums/power...ml#post2641282
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Old 23rd October 2011, 02:36 PM   #4504
RCruz is offline RCruz  Switzerland
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Quote:
Originally Posted by Lazybutt View Post
...on the other hand, I always have doubts on the effect of better supply to power digital circuits anyway , and changing the stock 9V supply by a better (linear) one has at least the advantage of avoiding injecting high frequency junk into the squeezebox.
IMO, uge gains are obtainable using separated PSU´s feeding independently all chips inside a digital circuit. This way you can avoid poluting each chip PSU line with junk coming from other chips.

But even better gains are obtainable if you use superegs instead of the stock industrial regulators.

My über CD53 with 11 superegs feeding independently all chips PSU line proves that.
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Old 23rd October 2011, 02:47 PM   #4505
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Hi,
I lost track of the salas shunt story.
I have build a few on perf board that work great. Now I need some more psu's and am a bit tired of that work. Is there a group buy or the like for printed boards? I'm heading for version 1.2 (I think it was...) and voltages between 3.3 and 18 and need several boards.

Thanks i.a.,
Rüdiger
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Old 23rd October 2011, 02:54 PM   #4506
Salas is offline Salas  Greece
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There is that back in black 1.1 one on GB board. Well received.
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Old 23rd October 2011, 04:16 PM   #4507
Liliya is offline Liliya  Norway
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There are a lot of reading on how it is possible to improve the sonic performance of the Squeezebox Duet.
Commercial companies offer modifications in several steps too, in my opinion, sky-high prices. I have taken my inspirason to improvements from Mr. Lamizator. (squeezebox)
The common denominator for everyone, whether they are commercial or comes from private individuals, is that they throw their critical eyes on the included power supply.
Everyone experiences audible improvements by replacing the power supply to a better one.
Mr. Lamizator goes a step further by "improving" both the analog and digital controllers on the Duet circuit board. He does not go so far as Studiostevus proposes: To replace the regulators on the Duet board.

That is certainly a good idea. Although I will stay away from such intervention, as I have very bad experience with removing ICs from my DCX 2496. The danger in the process to destroy the print tracks are imminent. Possible that the printed tracks on the Duet is of better quality than on Behringer.
A change of the regulators, if done, I will leave it to someone who is more accustomed to SMD components. And my question is where to find leg compatible regulators for this purpose? On the board it is AVDD 33 (analog) and DVDD 33 (digital). Proposal to better types???

Eivind Stillingen

Last edited by Liliya; 23rd October 2011 at 04:19 PM.
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Old 23rd October 2011, 05:03 PM   #4508
Salas is offline Salas  Greece
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Liliya:

Here's what you asked from the original James print for your application:

R1=1R 3W
R2=120R
R3=120R
RC=27R
RS=0.1R 2W
R5=1K
R6=wire jumper
R7=27R
R8=120R
C1=47uF polar 25V
C2=470uF polar 25V high quality
C3=220uF polar 25V high quality
Q1=IRFP9240
Q2=BC560C
Q3=BC550C
Q4=IRFP9240
J1,J2,J3=K170BL (J1=weakest IDSS in your stash)
Vref connector (above j1)= Don't use a Zener, bad region for noise in your voltage. Try resistors 1-2k until you hit 9VDC out.
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Old 23rd October 2011, 06:52 PM   #4509
Liliya is offline Liliya  Norway
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Salas, A Big Thank You!!!


Eivind Stillingen
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Old 23rd October 2011, 10:20 PM   #4510
Liliya is offline Liliya  Norway
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Salas, I forgot: The Vref, what do you suggest. Leds? What voltage?

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