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Old 3rd March 2014, 12:32 PM   #1351
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Join Date: Dec 2005
Location: Norway
here´s the proof
posting 334

BUFFALO III - Side 7

best
Leif
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Old 3rd March 2014, 01:58 PM   #1352
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Join Date: Mar 2011
Quote:
Originally Posted by leifchristensen View Post
your solution?
that photo is from my dac and I was the one that first gave the tip to the Norwegian DIY community documented with this exact picture
(even my handwriting with pencil on the rear panel !)
the most significant upgrade to any usb dac imo
best
Leif


Wrong choice of words from me. You are correct Leif, and it was thank to you who gave me the tip, that I have a very good sounding dac with Exa today.

Instead of opening my dac and take a pic, I borrowed your exellent pic which show how it can be done (and exactly how I did it too).

Hope this clear things up. Not my intension to take credit for what you have done, and I must say that you impress me in your never ending search for better sound.

Last edited by smooth dancer; 3rd March 2014 at 02:11 PM.
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Old 3rd March 2014, 02:07 PM   #1353
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Join Date: Dec 2005
Location: Norway
no problem.....
btw psu in picture is Borderpatrol designed choke input
best
Leif
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Old 3rd March 2014, 06:44 PM   #1354
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Quote:
Originally Posted by smooth dancer View Post
Hi George

I can measure later today

Hi again George

When measuring the way you describe, I find no resistance when using my FLUKE meter. Is this a good or bad thing ?

Regards
Tommy
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Old 3rd March 2014, 07:18 PM   #1355
exa065 is offline exa065  Canada
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Join Date: Feb 2011
Hi Tommy,

It is not a good thing. You should measure infinitely high resistance between the PC ground and the DAC ground. By changing the power source for the USB chip you have introduced a connection between the computer ground and the analogue ground. This connection acts as antennae for the high-frequency computer noise. This common noise travels freely to your DAC and amplifiers. Your exaU2I is like not having the ground isolation.



Try to use dedicated transformer, power supply etc. for the 5V supply that goes to the USB. Keep the grounds separate.
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Old 3rd March 2014, 07:57 PM   #1356
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Tommy:
no resistance as in ZERO or what exactly do you mean?
best
Leif
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Old 3rd March 2014, 08:44 PM   #1357
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[QUOTE=exa065;3840853]Hi Tommy,

It is not a good thing. You should measure infinitely high resistance between the PC ground and the DAC ground. By changing the power source for the USB chip you have introduced a connection between the computer ground and the analogue ground. This connection acts as antennae for the high-frequency computer noise. This common noise travels freely to your DAC and amplifiers. Your exaU2I is like not having the ground isolation.



Try to use dedicated transformer, power supply etc. for the 5V supply that goes to the USB. Keep the grounds separate.[/QUOTE



Edit: I think everything is ok George ( based on what you write above ) or ? ( see my answer to Leif in the next post )


I am using an dedicated transformer and psu ( placid hd )and the sound is great. Here is a bad pic Click the image to open in full size.

Click the image to open in full size.

Last edited by smooth dancer; 3rd March 2014 at 09:08 PM.
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Old 3rd March 2014, 08:51 PM   #1358
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Quote:
Originally Posted by leifchristensen View Post
Tommy:
no resistance as in ZERO or what exactly do you mean?
best
Leif
Hi Leif

Fluke shows: OL = open loop. No continuity or over limit or "infinity" on a resistance scale.
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