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Old 9th December 2006, 08:44 AM   #1
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Question Spdif transformer

What you think about this kind of circuit, is it ok?

Click the image to open in full size.

Where can I find some information about these spdif transformer circuits and operation theory?
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Old 10th December 2006, 01:02 AM   #2
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Add a bypass cap on the ground input.
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Old 10th December 2006, 06:28 AM   #3
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Quote:
Originally posted by ezkcdude
Add a bypass cap on the ground input.
why, is it for RF bypassing? Maybe the capacitor in the picture is optional.

Now I found some theory:

http://www.scientificonversion.com/t...l_paper_1.html
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Old 10th December 2006, 11:56 AM   #4
seoman is offline seoman  Netherlands
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Quote:
Originally posted by macgyver


why, is it for RF bypassing? Maybe the capacitor in the picture is optional.

Now I found some theory:

http://www.scientificonversion.com/t...l_paper_1.html
The 0,01F is NOT optional!
It blocks the DC current.
The transformer will shortcircut the output if that cap is removed.
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Old 10th December 2006, 12:37 PM   #5
tubee is offline tubee  Netherlands
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A DS8922 buffer circuit would be better imo. Build a receiver circuit in dac too. I removed the spdif transformer in the cdp.
See ECdesigns ultimate dac with 1541 (long thread!)
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Old 10th December 2006, 12:57 PM   #6
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Quote:
Originally posted by seoman


The 0,01F is NOT optional!
It blocks the DC current.
The transformer will shortcircut the output if that cap is removed.
Yes it blocks the DC and it prevents the transformer to go saturation. They didn't use it in AES1998 paper (page 34) so that's why I was curios.
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Old 10th December 2006, 03:46 PM   #7
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If there is a cap/transformer in the output of the feeding device this particular cap can be omitted but it won't harm to leave it there ( just in case ).
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Old 10th December 2006, 03:56 PM   #8
Ryssen is offline Ryssen  Sweden
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Quote:
A DS8922 buffer circuit would be better imo. Build a receiver circuit in dac too. I removed the spdif transformer in the cdp.
You mean a buffer instead of transformer,or just remove the transformer?
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Old 10th December 2006, 05:20 PM   #9
phn is offline phn  Sweden
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Why is a chip buffer better than a trafo in this case? Everywhere else a trafo seems to be the superior alternative. Why not use both?
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Old 10th December 2006, 05:51 PM   #10
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Quote:
Originally posted by jean-paul
If there is a cap/transformer in the output of the feeding device this particular cap can be omitted but it won't harm to leave it there ( just in case ).

Actually, it does do harm. It adds jitter. Better to have only the cap on the source output.

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