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Soekris' DAC implementations
Soekris' DAC implementations
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Old 18th January 2015, 02:26 PM   #101
Eldam is offline Eldam  France
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Page 5 above :

Quote:
Originally Posted by soekris View Post
There will be two AES/Spdif inputs:

1: Balanced into LVDS Receiver, can be connected directly to transformer and can be run single ended for SPDIF Coax, just a capacitor and two resistors needed when single ended 75R. To keep it isolated I recommend to always use a transformer for AES Balanced and SPDIF Single Ended inputs.
And proposal to help : http://www.diyaudio.com/forums/digit...ml#post4189001

Maybe pulse transformer is a better than traffo here...
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Old 18th January 2015, 02:29 PM   #102
Julf is offline Julf  Europe
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Originally Posted by Eldam View Post
Maybe pulse transformer is a better than traffo here...
I think either of the pulse transformers you linked to should work.
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Old 18th January 2015, 02:44 PM   #103
Eldam is offline Eldam  France
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Ok, thanks. First page updated with the last links.
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Old 18th January 2015, 11:48 PM   #104
gazzagazza is online now gazzagazza  New Zealand
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Originally Posted by Julf View Post
Unless that is the only variable you change in a series of tests.
Julf, you have very strong 'opinions'. At the base of this is your 'belief' that everything can be determined objectively. Belief = faith. Almost all of you contributions to the forum thread seem to be for no other purpose than to promote your faith. It is tiring.
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Old 19th January 2015, 01:12 AM   #105
spzzzzkt is offline spzzzzkt  Australia
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Eldam - Søren said that he had purchased Murata DA101C pulse transformers, and I commented that these are widely used in commercial and diy hifi gear.

Some view the Murata DA101C as an UPGRADE from the Pulse PE-65612NL, but I haven't heard so couldn't say how accurate that opinion is.

Murata DA101C - http://au.element14.com/murata-power...06h/dp/1362398

Last edited by spzzzzkt; 19th January 2015 at 01:35 AM.
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Old 19th January 2015, 01:40 AM   #106
rickmcinnis is offline rickmcinnis  United States
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Is there a reason for why SPDIF inputs get this treatment and I2S inputs never seem to use transformers?

The isolation would be just as useful if one can use transformers there. I know you need three or four, depending on your setup.
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Old 19th January 2015, 01:41 AM   #107
spzzzzkt is offline spzzzzkt  Australia
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Quote:
Originally Posted by rickmcinnis View Post
Is there a reason for why SPDIF inputs get this treatment and I2S inputs never seem to use transformers?

The isolation would be just as useful if one can use a transformer there.
The I2S inputs are isolated on the DAC board.


Another option for pulse transformer:
The Murata 76601/3C has specs that are very close to those of the Newava and was suggested a good alternative on Diyhifi a few years back.
http://au.element14.com/murata-power...1-1/dp/1087809

Last edited by spzzzzkt; 19th January 2015 at 01:44 AM.
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Old 19th January 2015, 01:55 AM   #108
abraxalito is offline abraxalito  United Kingdom
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Quote:
Originally Posted by rickmcinnis View Post
Is there a reason for why SPDIF inputs get this treatment and I2S inputs never seem to use transformers?
You can only use a transformer to couple AC signals - that is signals with zero DC content. The I2S data wire is not guaranteed to have zero DC, the other two could be trafo-coupled.
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Old 19th January 2015, 02:00 AM   #109
mcluxun is offline mcluxun  United States
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One question: does the quality of the pulse transformer really matter that much knowing there will be fifo and reclock for i2s?
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Old 19th January 2015, 02:04 AM   #110
abraxalito is offline abraxalito  United Kingdom
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Trafos can pass noise between the windings, however whether you have any noise is a system-wide matter, not directly related to the DAC itself. When there's a high level of jitter immunity, as here, I'd focus on a trafo with the lowest inter-winding capacitance. Others though prioritize jitter performance over noise.
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