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Old 26th May 2019, 04:00 PM   #61
kenta16807 is offline kenta16807  Sweden
diyAudio Member
Join Date: Sep 2005
...Thinking about it some more...the drift 'problem' is for the SE version.

With duly matched and thermally coupled FET's it shouldn't be a problem.

...then again, I haven't built it
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Old 28th May 2019, 05:33 PM   #62
phongnavy is offline phongnavy  Viet Nam
diyAudio Member
Join Date: Feb 2014
Location: HN
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Originally Posted by Alchamist View Post

I have 4 PCM1704U-J and JLSound I2SoverUSB board.
I2SoverUSB - I2S over USB Audio

My plan is make a reference DAC which Non-Oversampling, full balanced , XLR and SE two type outputs.

First this circuit base from pavouk.org then returned to balanced type.Can it useable with this way, what is your opinion about circuit? According to this circuit could you recommend a reference I/V Converter, LP filter output? It could be discrete design maybe a transformer. Or these OPA627 and OPA2134P output acceptable for a reference grade?

Also i'm not sure how can i convert XLR outputs to SE outputs, what is best methods for that?
You can try my schematic, this is good method for you!
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File Type: jpg 6B159DA0-8028-4571-B257-58D4E5DDD56E.jpg (581.1 KB, 77 views)
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Old 2nd June 2019, 08:51 AM   #63
EUVL is offline EUVL  Europe
diyAudio Member
Join Date: Oct 2003
The JL Sound works as claimed.

This is not a DAC.
This is a measurement fixture to match (a batch of) PCM1704's.
So only one channel on IC test socket, and opamp IV.


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File Type: jpg 190601 PCM1704 Test Jig 1.JPG (351.6 KB, 50 views)
File Type: jpg 190601 PCM1704 Test Jig 2.JPG (255.3 KB, 51 views)
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