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Old 8th November 2012, 10:04 AM   #51
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Hi
Will a fsdh321 be a possibility for a good power supply.
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File Type: pdf fsdh = 321.pdf (44.4 KB, 35 views)
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Old 8th November 2012, 11:46 AM   #52
TheGimp is offline TheGimp  United States
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All switching power supplies by their very nature generate a great deal of unwanted noise (EMI/RFI).

It is possible to minimize the noise escaping from a switching power supply, however it takes a great deal of effort and understanding about how they work, ground systems, etc.

The fact that you are asking if this device (or any other device for that matter) could be made into a 'good power supply' indicates you may not have sufficient understanding of the underlying noise sources to design a switching supply to meet the requirements.

I highly recommend you avoid a switching supply for any audio devices.
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Old 8th November 2012, 02:29 PM   #53
BMW850 is offline BMW850  Netherlands
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Perhaps interesting to report Mr. Jung's new shunt regulator, there is a book released where about 13 well-known regulators are tested measuring and listening test, someone already read this book?

Here you find "some info": http://www.diyaudio.com/forums/power-supplies/220734-mr-jungs-new-shunt-regulator.html
http://waltsblog.waltjung.org/

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Old 8th November 2012, 02:36 PM   #54
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Hi TheGimp
It is indeed that I have no undertanding about smps.
So just the simplicity of the fsdh321.
That a smps (can) generate nois I know.
But 2 points,
A smps of 20 years ago or more, or a smps of the present
Its almost not to compare.
And a few years ago I read fore the second time the review of
the linn cd 12, and was surprised that they used a smps.
The linn cd 12 is still one of best cd players ever made.
So they solved the nois problem.
I believe that that quality for diy is not possible.
I think that the question is how can we solve the nois in a
smps, instead of don't use a smps in audio.
Because I am sure that a lineair PS is not sufftcient to get
the best out of audio.
To anyone, please react, give your opinion, I hope as soon as
possible that we here can start for a real good PS. for a shiga clone.
Best regards
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Old 8th November 2012, 08:32 PM   #55
TheGimp is offline TheGimp  United States
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While the need to calculate loop stability and tailor a feedback loop to compensate are for the most part long gone, the innate switching characteristic of the switching power supply have not changed.

In fact, they have gotten worse as Rds-on of FETs is now down into the low m-Ohm range, and Turn-on / Turn-off times are greatly decreased.

These are what makes switching regulators difficult to use in audio applications.

The inductor needs to be well shielded to prevent radiated interference.

The ground system needs careful attention to prevent switching currents from imposing themselves on the output voltage via the ground resistance.

In addition the linked article is for a flyback regulator. The flyback topology is inherently noisy.

For multiple outputs the article states a larger core will be needed, thus dictating a lower switching frequency. With a switching frequency in the lower portion of the 50-134Khz range, you are likely to have inter-modulation artifacts in your audio.

Lastly is the transformer itself. Care need be taken to insure low leakage inductance or efficiency goes down along with the output.

I recommend reading AN4137 before proceeding as it steps through the design process.

The process will require a PCB as flying lead construction introduces too much stray capacitance and inductance. Although, those are minimized by the low switching frequency.
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Old 3rd December 2012, 06:21 PM   #56
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Guys I m starting to build my own based on the tested kit. I was wondering what people are using for the chassis.
I am planning to use a plank of 27mm wenge to make the entire chassis out of it. I have used it on my DAC and preamp and I really love it. Both for its looks and its damping properties (nice, dense and heavy wood).
Any suggestions on how to mount the turntable for best results? I have checked how Peter did it and I am thinking of something similar but no copper plate. Full wenge everywhere.
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Old 3rd December 2012, 06:41 PM   #57
lohk is offline lohk  Europe
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Have you got any photos, Dimitris? I like the idea of a case made of solid dense wood very much.
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Old 3rd December 2012, 07:31 PM   #58
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Not at the moment. I am out and I need to go get some more wood to start working on it. In the meantime you can check Peter's thread to have an idea of how wenge can look.
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Old 8th December 2012, 05:33 PM   #59
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HI
A very interesting statement in the first line of the introduction in this ap-note.
regards
zjaakco
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Old 13th December 2012, 06:51 AM   #60
tvicol is offline tvicol  Romania
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AL CD puck dimensions attached.
Documentation was updated page 6 (Tentlabs clock implementation).
https://docs.google.com/document/d/1...-j9X4b7Q0/edit

Regards,
Tibi
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File Type: png VicolAudio_Shiga CD Puck AL non-magnetic.png (34.2 KB, 460 views)
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Last edited by tvicol; 13th December 2012 at 06:54 AM.
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