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I have a problem with my opus DAC. It's a build with the following parts: 3x Placid PSU 1x Metronome 1x S/PDIF Transceiver 1x Opus DAC v2.0 I have connected everything and the only thing I hear is a lot of hum. I have also tried it without the Metronome, but the end result was the same. Here are a couple of pictures (clickable) of my build:    
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I can't spot anything right away, what are the supply voltages when it is all powered up?
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Hello Russ,
The supply voltages are:
7,51 V
7,56 V
7,55 V
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Allright, the hiss/hum is gone. I found out I had to set the OSR jumper on the Opus to +, because i was using the 192Khz setting on the metronome.
But the problem is that there is no sound at all now.
Settings of Opus:
I2S: +
DSD: -
DEEMPH: -
MODE: -
IWO: +
DIFFHW: -
FSEL: O
MUTE: O
OSR: +
Settings of Metronome:
IFMT2: -
IFMT1: -
IFMT0: +
BYPASS: -
LGRP: -
MODE2: -
MODE1: -
MODE0: +
OFMT0: +
OFMT1: -
OWL1: -
OWL0: -
Automute jumpered
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Ok the first thing to do is to try just the receiver and Opus. Make sure the opus is setup for 44.1khz PCM.
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OK, so I just use the recommended switch settings, right?
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Allright, I tried it without the metronome with the following settings for opus:
I2S: +
DSD: -
DEEMPH: -
MODE: -
IWO: +
DIFFHW: -
FSEL: O
MUTE: O
OSR: O
Still no sound.
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I can't spot any problems on this end.
Double check continuity of the I2S signals.
Try putting MUTE to + instead of open.
Make sure you don't have any shorts around the output.
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Indeed for 44.1-48khz OSR must to be low (-).
For medium rat(88.2khz or 96khz) it should be open. And for high rate (176.4 or 192khz) it should be high(+)
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I have set OSR to - and I have tried putting MUTE to +, but still no sound.
How do I check the continuity of the I2S signals, can I measure it?
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I measured the resistance between input and S/PDIF Transceiver, between S/PDIF Transceiver and Opus DAC and between Opus DAC and output, but everything seems to be normal.
I have also tried a different source and a different digital cable, but there is still no sound.
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In the S/PDIF Transceiver, set the TXSRC to +.
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I have set the TXSRC to +, but nothing changed.
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Actually that switch will make the transceiver work in transmit mode.
I would snap a good close up of the top of the Opus.
Also measure the output side of the tristate switches and make sure they actually are as intended (high or low).
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I have been a bit busy last days, but here are two pictures. Could you please tell me how to measure the output sides of the tristate switches?  
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The output side of the switches is the pad next to the label.
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I came back from holiday yesterday, so I just read the message.
I'm still not sure how to measure it, could you please explain it to me?
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Nobody?
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Could someone please help me?
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