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Old 17th December 2013, 04:00 PM   #21
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It is the same between GND / SPDIF and GND / DCK.
I can measure 75 Ohm between GND / SPDIF and 14-17 Ohm between GND and DCK.

The DAC is on the LAB at my job but as i remember GND / D1-D2 was several Mohm.

Does it give you a idea if it could be one of the multiplexors ?

I got setup for SMD but I really hope there is nothing wrong with the DAC itself

Thanks
Chris
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Old 17th December 2013, 04:21 PM   #22
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Yes unfortunately it sounds like the multiplexor associated with DCK is dead - or that signal is otherwise shorted. Probably ESD, but this is the first I have ever seen anything like that. They are pretty robust.

There is nothing between the mutiplexor and the DAC input pins other than a high value resistor to GND to keep the signal referenced to GND.

I suppose it is also remotely possible that the DAC input pin itself is shorted or has been damaged - but this seems less likely. I would check the other possibility first. Simply removing the multiplexor and then checking resistance from that resistor to GN will tell you if the short was before the DAC pin or not.

The measurement at the SPDIF input is perfectly fine.
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Old 17th December 2013, 05:15 PM   #23
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Ok this is strange as I work with ESD sensitive PCB's on daily basis and are very carefull about this.

Anyway, could you please give me the component number for the multiplexor related to the DCK so I can find it.
Also the type so I can find a replacement at farnell or RS ?

What worries me is that the DAC before was able to lock at the spdif and now it won't.

Russ, thank you for your help I really appreciate it.

Chris
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Old 17th December 2013, 05:23 PM   #24
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It may not have been ESD - I really have no way of knowing. All we know for sure is that input was not in this condition earlier since you were locking from the signal generator.

I will PM you some more info.

I am happy to help, very sorry for the misfortune.
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Old 11th January 2014, 09:52 AM   #25
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Just a update, it was not just one but all three at the i2s inputs there where defect.
At the moment they are removed and I use the spdif input.
The respective inputs are grounded and a wire has replaced the last multiplexer.

The setup with the AE is cancelled as I think it can be the reason for the blown up inputs.

The new setup is as follows :

Raspberry PI connected to LAN by wire and and the buffalo DAC connected to the PI throught M2tech hiface 2.
Volumio is the software I use and now I am able to stream with airplay from the Imac and use the ipad as remote.
In pitperfect quality.

Quite a decent sound for such a user friendly setup.

Thanks to Russ for supporting throught this critical time in life where your DAC is down

Best regards
Chris
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Old 15th January 2014, 10:31 PM   #26
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Thanks for the report Chris! I am very happy to help, especially folks like you.

Glad your set now. Your project sounds very interesting I would love to see more! Feel free to start a thread.
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