It is not dual mono, but perhaps that setting would swap left and right output from the dac anyways (0 is default left is left, right is right - 1 is left is right, right is left)? Oh well no real crisis I only have to run slightly longer internal IC cables if they can not be swapped.

The first spdif input Group is done (measured With dmm, not tested With actual signal yet).

Tested With different Power supplies and there is "no" problem (aprox 5mV offset on each output). Replaced the LCDPS With another LCDPS; problem still there. Next to try is to swap out the trannies, then Placid HDBP With a LCBPS.

Oh well. Long way to go

Edit: help? I can not get rid of the offset no matter what I do. The transformers have been swapped, The IV stage, PSU`s DAC module (B3 vs B2).

No matter what I do I end up With DC offset ranging from 60 to 120mV between ground and - + and up to 200mV between pos and gnd on the SE output.

Edited by user Friday, March 29, 2013 12:56:50 AM(UTC)  | Reason: Not specified

Why not just wire to the opposite jacks?

It looks like the end of the road for me for now. I have put more
Money and time into this Project than I should have, and now that I
cant work Things out and ask for help on troubleshooting there is no
response or response on the wrong Things. The modules are atm very
Close to ending up in the bin, but for now I`ll pack it all away and
unfortunately be without a stereo system for a while, untill either I
can get any help from the People who make the modules or buy something
else that actually work. What scares me the most is that I have not
measured for DC offset untill now and I may have sent a signal With
loads of DC offset to my Power amp and Audiphysic Virgo 5 speakers for
about 2 years.... If my speakers are damaged TPA will have a hard time
explaining how exactly the Ivy3 is DC coupled (as they have said in
the past). I did everything by the book and if I had not measured the
DC offset prior to connecting the balanced output to a 4pin XLR plug,
my beyerdynamic T1`s would have ended up in the bin. With damaged
drivers.

Edited by user Friday, March 29, 2013 1:58:26 PM(UTC)  | Reason: Not specified

Regardless of inputs Connected or not. I am not too keen on hooking it up to the Power amp With that much offset. The Ivy alone has a up to 5mV offset when the dac is not Connected to it. When I Connect the dac, the offset is as stated above (underlined).

Edited by user Friday, March 29, 2013 2:56:52 PM(UTC)  | Reason: Not specified

If you really are concerned you can use AC coupling caps, but there are hundreds (if not more) people using IVY Dc coupled. :) It should not be necessary at all.

Thank you very much. The test Points as I have measured are between GND and the Red "Arrows".

I will test the dac Connected to an amplifier later on, but at this stage this is unfortunately no longer the only issue, as I can not seem to get a Lock on the dac and the Lock and mute leds live a life of their own. Sometimes I get the Lock led glowing when there is no Source Connected...

I measured my DAC 1 which is a BIII & IVY, it was not connected to an amp, on the left channel at the SE +, + & - I have virtually no DC showing, on the Right channel I had, SE + = 190mV, + = 90mV, - = 100 mV, interesting. This DAC has been up & playing thru my amps for a long time with no obvious ill effect, it does go via a analogue active crossover, it sounds great all seems well.

I then tested my DAC 2 which is a BIII SE & Tube-i-zator, which was also not connected to an amp, had just removed it to play with the code. OMFG, the DC is off the planet, I only tested between the grnd & SE signal on both sides, one side read 36v, yes that's 36v, which steadily fell the longer I held the mutlimeter in place, of course the phone rang so I'm not sure how low it would have gone, the other channel showed 890mV.

Hmm, my amp still works fine!! I then connected a Kingrex T class amp to the DAC 2, played music & re tested Grnd to Signal + again, both channels showed 0.002v.

I don't know jack about how this all works but my guess is there isn't really a problem, if you have a cheap amp give it a run, assuming you can get a lock.

Edited by user Sunday, March 31, 2013 8:21:06 AM(UTC)  | Reason: Not specified

Thank you for confirming it. Those measurements look very simular to the ones I got. I take it that the same thing as With the Tube-i-zator will happen With the measured DC when hooking up the Ivy to an amp.

that explains everything (regarding the trident)