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Old 10th June 2017, 02:17 PM   #6491
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Quote:
Originally Posted by Curious Fitz View Post
15v 0 15v 0

9v 0 (using that for the S/PDIF to I2S)Try S/PDIF with transformer input, maybe the s/pdif to i2s is the culprit

I do have other transformers though...?

I get it - use a lower voltage transformer too? Bingo ,
see if the supply get's hot, if so try 12V or even lower depending on voltage drop of supply


I'll get some plastic posts to support the board in the case perhaps: LCBSBM-4-01 ART | LCBSBM-4-01 ART, 6.4mm High Nylon PCB Support for 3.18mm PCB Hole, 12.7 x 12.7mm Base | Richco Looks fine
Also try to keep short (psu & input) cables.

Last edited by paulebappie; 10th June 2017 at 02:21 PM.
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Old 10th June 2017, 02:20 PM   #6492
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Quote:
Originally Posted by paulebappie View Post
Try S/PDIF with transformer input, maybe the s/pdif to i2s is the culprit
Please could you explain that a little more?

I am running the S/PDIF board with the transformer input - do you mean use a separate transformer for the S/PDIF board?

Thanks so much for all the advice!
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Old 10th June 2017, 02:27 PM   #6493
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Quote:
Originally Posted by Curious Fitz View Post
I am running the S/PDIF board with the transformer input - do you mean use a separate transformer for the S/PDIF board?
In the foto i can see an extra board, is that your s/pdif to i2s converter? Maybe this board gives harsh top-end? So try without the board.

See https://hifiduino.wordpress.com/2015...c-users-guide/

For direct s/pdif input with transformer.

Last edited by paulebappie; 10th June 2017 at 02:29 PM.
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Old 10th June 2017, 02:29 PM   #6494
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Quote:
Originally Posted by paulebappie View Post
In the foto i can see an extra board, is that your s/pdif to i2s converter?

See https://hifiduino.wordpress.com/2015...c-users-guide/

For direct s/pdif input with transformer.
Yes it is - would you recommend using the direct in to the Soekris DAM rather than a separate S/PDIF to I2S then - and why?

Or maybe you mean: try it and see if it is the culprit

Thank you
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Old 10th June 2017, 02:31 PM   #6495
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Quote:
Originally Posted by Curious Fitz View Post
Yes it is - would you recommend using the direct in to the Soekris DAM rather than a separate S/PDIF to I2S then - and why?

Or maybe you mean: try it and see if it is the culprit

Thank you
To make sure the harsh top-end is not coming from this board.
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Old 10th June 2017, 02:32 PM   #6496
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Quote:
Originally Posted by paulebappie View Post
To make sure the harsh top-end is not coming from this board.
Brilliant: thank you SO much paulebappie - you are very kind

I really appreciate your help.

I'll report back when I've tried all your great tips
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Old 19th June 2017, 12:36 PM   #6497
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Well, I've tried now with -9v 0 +9v DC, and, some time to 'burn it in' (40+ hours now) and it sounds truly lovely.

The sound is far smoother than the few hours of play at +-12v DC.

Thank you paulebappie - I am really pleased

BTW I am now designing a case (one for the power supply, one for the DAC) and wondered if there is a pin out for the sync green light that you see on the board, and, what voltage LED I would need to use please?

Many thanks again - I am falling in love with this DAC...

Last edited by Curious Fitz; 19th June 2017 at 12:42 PM.
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Old 19th June 2017, 12:39 PM   #6498
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BTW: I tried adding a tube-buffer amp in-line with the RAW outputs and could hear no difference whatsoever.

Not sure if you need to 'burn-in' tube amps, I guess perhaps so.

I was going to use it to tone down the very harsh 90's electronica CDs ( the ones where they got a bit crazy with all 44KHz available...)
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Old 19th June 2017, 01:13 PM   #6499
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Quote:
Originally Posted by Curious Fitz View Post
Well, I've tried now with -9v 0 +9v DC, and, some time to 'burn it in' (40+ hours now) and it sounds truly lovely.

The sound is far smoother than the few hours of play at +-12v DC.

Thank you paulebappie - I am really pleased

Many thanks again - I am falling in love with this DAC...
Good work!
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Old 19th June 2017, 02:39 PM   #6500
markusA is offline markusA  Sweden
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Soekris> 30min CNC machine time sound awfully high for a front plate in a production run. (Unless it's something extreme we're talking about) I used to do CNC work...
Maybe get a second quote from a competitor?
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Current build to be found in my blog. Not so current anymore, everything is put on hold until march.
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