XMOS-based Asynchronous USB to I2S interface - Page 152 - diyAudio
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Old 18th December 2012, 11:03 PM   #1511
shoom is offline shoom  Europe
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Hi sinski

May be nothing but where do you have MCLK on the WaveIO connected to on the Buffalo II board?
Just a thought
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Old 18th December 2012, 11:10 PM   #1512
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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.
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Old 18th December 2012, 11:12 PM   #1513
henri47 is offline henri47  Belgium
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Hi Sinski,
did you connect GND of WaveIO groundplane to the DAC? Maybe nothing, but I can not see it on the pics.
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Old 18th December 2012, 11:14 PM   #1514
henri47 is offline henri47  Belgium
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Read the manual of WaveIO. GND-plane of WaveIO MUST be connected to the DAC GND
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Old 18th December 2012, 11:15 PM   #1515
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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.
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Old 19th December 2012, 08:44 AM   #1516
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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
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Old 19th December 2012, 10:26 AM   #1517
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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.

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 ?
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Old 19th December 2012, 10:30 AM   #1518
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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.
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Old 19th December 2012, 10:55 AM   #1519
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Quote:
Originally Posted by hochopeper View Post
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.
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Old 19th December 2012, 12:51 PM   #1520
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Default 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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