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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)

shoom 18th December 2012 10:03 PM

Hi sinski

May be nothing but where do you have MCLK on the WaveIO connected to on the Buffalo II board?
Just a thought

sinski 18th December 2012 10:10 PM

I am using only the screen of the ufl cable from MCLK to deliver the ground connection to gnd on the BII. AFAIK MCLK is not needed for the connection between waveio and BII.

henri47 18th December 2012 10:12 PM

Hi Sinski,
did you connect GND of WaveIO groundplane to the DAC? Maybe nothing, but I can not see it on the pics.

henri47 18th December 2012 10:14 PM

Read the manual of WaveIO. GND-plane of WaveIO MUST be connected to the DAC GND

sinski 18th December 2012 10:15 PM

GND connection is done by the screen of ufl cable from MCLK. I tried also different GND arrangements (H4 on waveio to DAC GND on digital input), nothing helps.

luisbock 19th December 2012 07:44 AM

Hi sinski
In the picture i see you use the internal USB connector, why don't you use the external one without the USB power connected? I have the same non isolated connection with ufl cables to sidecar, all ufl GND are connected to sidecar GND. The placid power supply is set with 500 mA, I believe it was said here that it was waveio requirements, at least for HD files.
Regards

sinski 19th December 2012 09:26 AM

I don't think tere is any difference between internal and external USB connector. With J12 on waveio you can set power source - from usb or external.

The ufl cables are screened nearly to the end.

After i installed additional heatsink on Placid i tried up to 650mA, nothing helps.:mad: :mad: :mad:

I also checked what will happen if waveio is not getting enough power and tried lower values and going with Placid under 300mA just turned off waveio, there was no digital noise or something like that.

Is there any chance to get here some support from Lorien/Lucian ? :confused:

hochopeper 19th December 2012 09:30 AM

Is it possible that you have a ground loop between computer and waveio/dac?

Do you have a spare 3.3V reg somewhere? You could use the isolated output of waveio to remove that possibility.

sinski 19th December 2012 09:55 AM

Quote:

Originally Posted by hochopeper (https://www.diyaudio.com/forums/digital-line-level/188902-xmos-based-asynchronous-usb-i2s-interface-post3291119.html#post3291119)
Is it possible that you have a ground loop between computer and waveio/dac?

Do you have a spare 3.3V reg somewhere? You could use the isolated output of waveio to remove that possibility.

I tested it with notebooks running only on battery and with SBT powered by original switched ps and my diy ps with superteddyreg, no change.

barrows 19th December 2012 11:51 AM

S.
 
This is probably a question for the TPA support forums. I suspect that you have the narrow DPLL software running on your B-II. Usually the narrow bandwidth DPLL will not play without dropouts with I2S sources. You can get alternative software chips from Twisted Pear Audio to try.


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