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Hello Just need some help understanding the Opus dual mono to IVY . After I studied the manuals and read this forum I sketched an diagram for dual mono opus to IVY wiring , dac's switch position an IVY's resistor settings. Can you just have a look...  All the best...
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You have it mostly correct, but you should add a small series resistance to each of the Opus outputs (21R will work fine)
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Thank you Mr Ross
for the resistors : it is OK to put the resistors in place of output capacitors of each Opus module ? and may I use 20R value for them?
All the best
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Yes that approach will work fine into IVY-III
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Hi, I was not sure where to post so I posted here . Here You see my setup and I have a problem with it.With only one DAC board there is everything good and playing nice and smooth but when I will set up dual mono configuration I got hard distortions in one channel.Both boards play without any problem one by one but not in dual mono.  there you can see an multi-switch activated from front panel button.  all voltages are OK...  you ca see there the 20R resistors mounted in place of output capacitors...  Have tried many combination but have same result,some time more some time less but distortions steel there... Hope to find out the problem ...
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This type of noise issue is almost always related to the routing of I2S lines.
Ideally, you would stack the two Opus modules with the S/PDIF Transceiver, so the I2S lines would be extremely short (2-3cm) and would not be near any other wires, especially power supply wires which can pick up radiated clock noise and inject it into your whole signal chain. It looks as through you are height-constrained in your case, however.
It may be worth trying to stack them just to see if you can eliminate the problem. Try putting the S/PDIF module in the middle, with an opus above and below it, and make the I2S wires as short as possible. If that fixes it, then you can work backwards with the layout/wiring to avoid adding the noise back in.
I would try temporarily rerouting the ribbon cable that is next to the I2S lines to see if that makes a difference.
You also may benefit from linking the three GND outputs from the LCDPS supplies directly at their outputs, then removing the I2S GND lines.
Another question... what is the VA rating of the transformer you are powering the digital modules with?
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Thank you Brian, Stacked the two Opus modules with the S/PDIF Transceiver, also have linked all GND outputs of LCDPS and everything works just perfect  Nice sound comes out  Thank you guys , you are great 
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My opus dac stopped working. 2 weeks ago I upgraded dac section with new regulator power supplys that I temporarily set above the old regulators and everything went well and the DAC worked perfectly. Yesterday I decided to arrange everything in the box to change the old and new regulators, so I disassembled the modules so I can work mounting new regulators modules. Everything went well and I put all modules in place and I assembled the DAC. After this the DAC's never worked at all. You can see the old arrangement in pictures in old posts and new one in the pictures below. Everything seems to work well, SPDIF module locks on signal and all 4 LEDs light green only DAC modules not draw any sound. Voltage measurements show: 7.52 at output power regulators 3.25 VRD 4.92 VRA both DAC modules What could it be? I'm stuck here are the pictures   Cheers, Nicolae
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Someone?
Any idea how could I troubleshoot this?
To be sure, at least for SPDIF module, it locks on signal and all 4 LED lights green means that the module is functional?
Is it possible that while working all modules to be damaged by static electricity?
Cheers,
Nicolae
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I found out that Transceiver module works.
I took signal from SPDIF output of the module and connected to the AV receiver and I had sound. After that I checked out one by one DAC modules and none of them worked with Transceiver module. Now how can I find whether DAC module is or not functional?
Cheers,
Nicolae
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One clue is the current drawn by WM8741. From WM8741 datasheet:
Digital standby current: 1.5mA
Digital operating current: 40mA
Analogue standby current: 45mA
Analogue operating current: 55mA
If the digital current gets nowhere near 40mA (<10mA), the chip is either not been turned on or damaged. On the other end, if the digital current goes up as high as 100mA or more, it is likely that the ESD diode/s guarding the IO port is damaged and the chip will overheat.
The loss due to the onboard LDO regulators VRA and VRD is small so the currents going into the DAC module is only a bit larger than the currents drawn by WM8741. Therefore, don't need to take the measurement by breaking up the connections from the regulators to WM8741.
Another thing to check is the voltage on pin 11 & 18. This should be close to 2.5V.
Good Luck!
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