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Old 7th February 2013, 12:42 PM   #11
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stistill not implemented, but seems that I2s from sound card are quite polluted with digital noise
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Old 7th February 2013, 12:56 PM   #12
marce is offline marce  United Kingdom
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Seems? i work as part of a couple of teams that do a lot of audio based design, digital noise is quite often inaudible. With noise you do need to do measurements to determine the frequency and the source of the noise. Then you can work out whether it is serious and how to combat it.
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Old 7th February 2013, 12:58 PM   #13
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going from the sound card directly to the TDA1543 NOS dac having common ground will not be too bad?
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Old 13th November 2016, 08:41 AM   #14
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Hi, I have a setup of RPi and asynchronous DAC with is own precise clock. They are linked with I2S and they share PSU. PS connections are isolated inbetween and PSU is very stable on its own. I did not notice any noise, however I would like to add extra isolation to I2S connection. Jitter should not be a problem in my case as I have DAC with its own clock. I am looking to buy this one: (NVE IL715) http://www.nve.com/Downloads/il71x.pdf What is your opionion on my decision? Thanks.
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Old 14th November 2016, 08:32 AM   #15
marce is offline marce  United Kingdom
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Galvanic isolation is to isolate stray currents and for voltage protection it is not primarily for noise isolation, noise isolation is a far more complex problem to solve and a lot is down to correct layout and correct filtering from source to destination. This is something that I very rarely see done in the amateur world of layout.
The devices themselves all have some coupling capacitance between sides, this is the main coupling method for high frequency noise, so some noise will cross the devices, so more than just slapping an isolating chip down is required. I have to ask is it really necessary to do this, are you likely to gain anything and more important do you have the equipment to test whether your solution works, a decent scope is the minimum you would require.
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Old 15th November 2016, 05:52 AM   #16
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If I understand this, you have a Julie@ PCI sound card from which you wish to tap the I2S and feed to a TDA1543 DAC? I assume the Julie@ is inside a PC?

Ignoring the isolation question for a moment, given that you want to keep I2S runs as short as possible it implies that you will need to install the DAC inside the PC as well? If so, that is a pretty noisy environment period.

If it were me (and I have successfully done something very similar) I would invest in a pair of Twisted Pear Teleporters; these use LVDS to send the I2S over a considerable distance and will give you isolation too. I would also consider reclocking the I2S immediately before the DAC.

I assume you know that you can expose the I2S on the Julie@ simply by removing the top section of the card?

Here's some information on the Teleporters;

Introducing the bit "Teleporter"

Teleporter Digital Transfer Module

Whoops, just noticed how old the original posts were so you can ignore this.

Last edited by nautibuoy; 15th November 2016 at 05:56 AM. Reason: See my 'Whoops'!
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Old 17th November 2016, 10:30 PM   #17
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NVE IsoLoop Isolators--The Opto Alternative
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