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-   -   XMOS-based Asynchronous USB to I2S interface (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface.html)

Nikon1975 30th November 2011 08:34 AM

Quote:

Originally Posted by barrows (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post2800059.html#post2800059)
U.FL mini coax for mine, a 5 CM link with a mini bnc on both ends. I was able to solder the mini bnc to the pad at R17 for the signal conductor, very carefully...
Lorien's Wave IO already has the mini bncs at the board end...

Could you post a picture?

Thanks,

D.

Bunpei 30th November 2011 01:34 PM

Quote:

Originally Posted by Kovax (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post2799781.html#post2799781)
Regarding BII and Tridents and ferrites, check the page no. 9 of the following document;
http://www.twistedpearaudio.com/docs...ide_V1.0.5.pdf

Have audiophiles here already referenced the following "HiFiDUINO" blog page by "glt"?
BII 80MHz + 352.8KHz Audio + Silence = Noise H i F i D U I N O

The blog page has the excellent pictures and explanations.
https://hifiduino.files.wordpress.co...pg?w=600&h=310

https://hifiduino.files.wordpress.co...97-2.jpg?w=600

flocchini 30th November 2011 07:18 PM

Again to all of you thanks for the information.

My plan is to pull my PH regulator to clock and solder Master clock from Lucian's board to BII. I'll do it this weekend if my eyes are comfortable with small and tight locations.


Separate question - has anyone tried a PH reg or similar to power clocks on XMOS board.

barrows 30th November 2011 07:30 PM

I use two Trident regulators, running from a separate +5V supply (a linear pre regulator) and separate transformer to power the oscillators on my XMOS based USB board. Definitely resulted in a bit of improvement, as everything at this level tends to. Remember, when you switch to synchronous clocking, the jitter will be the result of the jitter on the USB board, so anything one can do to reduce that jitter to the absolute minimum will be an improvement. Paul Hynes regs might be even better...

flocchini 30th November 2011 08:33 PM

Quote:

Originally Posted by barrows (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post2801029.html#post2801029)
I use two Trident regulators, running from a separate +5V supply (a linear pre regulator) and separate transformer to power the oscillators on my XMOS based USB board. Definitely resulted in a bit of improvement, as everything at this level tends to. Remember, when you switch to synchronous clocking, the jitter will be the result of the jitter on the USB board, so anything one can do to reduce that jitter to the absolute minimum will be an improvement. Paul Hynes regs might be even better...

Thanks barrows

I will have the PH reg I pull from the Buffalo and another from my previous HiFace setup + the PH pre-regulator so this may be an option for me.

After i to the sync set-up I will look into the shunts for the clocks

4est 1st December 2011 09:10 AM

Small and tight locations is right. My WavIO came in on Monday, and the clocks are about 2mm x2.5 mm- smaller than the uFL connectors for the i2s outputs!

qusp 2nd December 2011 08:35 AM

what about actually upgrading the clocks? sorry if thats blaspheme, i assume they were chosen for best performance at a certain price point?

4est 2nd December 2011 01:22 PM

Upgrading clocks is certainly an option, but one needs to be careful on their selection. The specs on the clock may not tell the whole story. A case can be made for an isolated power supply and clock too.

barrows 2nd December 2011 05:49 PM

Clocks...
 
Are discussed earlier in the thread. With NDK being the preferred option. the specs of the NDKs are very good, better than Crystek CCHD-957s. But Lorien noted that the NDKs are hard to get. Hence, I think he went with Fox?
If one can get NDK, they should be better, and fit the same footprint.

reo 2nd December 2011 08:05 PM

For such a high price for that cchd-757 one would assume it was better than...
Having the NDK on this card it's one less thing to ponder on .

On another note . , i have installed a standalone 5V regulator replacing my PC'S usb2 output to WaveIO, it was not necessary after all, similar quality sound coming out either way. My PC's power supply is highly efficient and never drifted enough to substantiate a standalone regulator, least now i know, next thing i will try out is, isolating my usb2 cables from the pc with it's own standalone 5V, that's if it has noise, i wonder about that as well ,PH. regulators vs Trident might yield different results,i use them to control Mojo2 and that's another story . i'm thinking this card is already up to snuff, if one is in synchronous mode and use a separate regulator driving the card if incoming power supply is questionable, then both mods are a worthwhile move to reduce noise.
regards
rol


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