One thing that may help in your case would be to connect -IN and GND on INA, INB and INC. Just solder a jumper. Easy to undo later if you like.

I have no way to know. I can only guess. :) My guess is that you already have a transformer coupled source or two. If that is true then this approach should solve the problem nicely. :) What this does is firmly reference the primary side to GND. Worth a shot. :)

Well, I would say your a bit on the low side - remember the load is dynamic.

I wish I could reproduce what you are seeing. I have not been able to. I can only guess since you had no issue prior to installing in the chassis that you may need to isolate things a bit more.

Yes that is indeed strange, and it suggests that the two are interacting with each other in some way.

Corpius, I am just not sure what to tell you since many others are using it without a problem.

Can this be related to 220/230V?
I had the same issue and so did two others I know of here in Norway. I am however a little curious if this may be solved by trying to connect the other set of primary`s from the transformer or at least make sure that the same "phase" is shorted on both the digital and analog part of the buffalo?

Well now I tried everything I could think of, but I can't get it to work properly. This is what I found

- I get a steady lock on all inputs when I connect just one source.
- When connecting second source to any of the free inputs and the source is not powered it looses lock.
- Switching on the second source makes the DAC lock onto the signal of the selected source.
- Connecting 3 or even 4 sources makes no difference.
- Connecting GND to -IN makes it a little bit better, but still far from good.

I also tried getting the board out and connecting it outside the chassis, re-soldered everthing, Checked and double checked the connection between the sidecar and spdif board. I disconnected all components from earth, and then connected them back to earth one by one. Despaired as I was I even hooked up other RCA connectors. Results: no differences

Now I have just one spdif source connected and all other spdif sources connected to my Rega dac. This dac is synchronously clocking the digital data with the receiver PLL (removing any jitter from the input signal) and sends it out again through spdif to the BufFalo dac. Perhaps even a better solution , but much more expensive. I now need another dac and paid double the price for a single spdif level converter. Luckily i'm convinced that i2S is the way to go

Edited by user Friday, August 31, 2012 11:02:22 PM(UTC)  | Reason: Not specified

Perhaps we could switch out the source that is not in use (or rather switch on the one in use) with a simular circuit as the sidecar. Taking the trigger voltage from the front panel leds for those that don`t use an arduino.

I am going to test if I can get a lock with the sources totaly independent of each other when connecting coax sp-dif (consumer) to the sp-dif input board but only connect D1 if I remember correctly (the one channel used from the sp-dif board) and sending TTL level sp-dif from optial modules directly to the sidecar/B3. But things have not gone according to plan this summer. I hope I get around to it soon.

To Russ and Brian: I thought that since I have only seen this issue in countries running 220/230V and the fact that you can not replicate the problem, that this might be related to that. Here in Norway the phase is not fixed on appliances either, in that I mean that the components can be connected in opposite phase from the wall outlet.

You could use the same port expander as with the lcdioextender in order to save some code-work ;)

Edit: I`ll have a look around for a 220V to 110V converter that I can borrow. I think one of my friends has one in his stereo system.

Edited by user Saturday, September 1, 2012 12:43:52 AM(UTC)  | Reason: Not specified