I2S galvanic isolation: potocoupler or transformator??? - diyAudio
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Old 6th February 2013, 09:02 AM   #1
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Default I2S galvanic isolation: TOSLINK optocoupler or transformator???

I would like to decouple galvancally the I2S source from my DAC, without introducing extra jitter

3 options:

optocoupler
transformator, maybe spdif or ethernet transformator
TOSLINK using 3 fibers
other optical link using high speed toslink (coming from ethernet over fiber equipment)

Any advice?

Last edited by marconi118; 7th February 2013 at 04:24 PM.
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Old 6th February 2013, 11:09 AM   #2
qusp is offline qusp  Australia
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all will add jitter, galvanic isolation without reclocking adds jitter, it just does
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Old 6th February 2013, 01:04 PM   #3
marce is offline marce  United Kingdom
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True, everything can add jitter, optos I believe are the worse.
You can also add aDum devices to your list.
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Old 6th February 2013, 01:08 PM   #4
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Quote:
Originally Posted by marce View Post
True, everything can add jitter, optos I believe are the worse.
You can also add aDum devices to your list.
But does it add sufficient jitter to caue a difference which you can measure or hear?
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Old 6th February 2013, 01:12 PM   #5
marce is offline marce  United Kingdom
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IMO no.
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Old 7th February 2013, 09:18 AM   #6
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is the galvanic isolation of the grounds more beneficial than the jitter introduced?

I suppose that I2S over 3 toslinks is still better than SPDIF over 1 TOSLINK?
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Old 7th February 2013, 09:59 AM   #7
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Quote:
Originally Posted by jackinnj View Post
But does it add sufficient jitter to caue a difference which you can measure or hear?
IMO that question has missed the point slightly.

The question should be: Is the added jitter worse than the noise removed from the system for the whole system performance? eg Is there a nett gain in system performance?
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Old 7th February 2013, 10:02 AM   #8
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Quote:
Originally Posted by marconi118 View Post
is the galvanic isolation of the grounds more beneficial than the jitter introduced?

I suppose that I2S over 3 toslinks is still better than SPDIF over 1 TOSLINK?
What is your i2s source?
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Old 7th February 2013, 10:04 AM   #9
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JULY@ PCI PC sound card, or maybe a squeezebox touch
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Old 7th February 2013, 12:22 PM   #10
marce is offline marce  United Kingdom
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Do you actualy have a noise problem?
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