Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
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:    
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
I can't spot anything right away, what are the supply voltages when it is all powered up?
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
Hello Russ,
The supply voltages are:
7,51 V
7,56 V
7,55 V
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
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
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
Ok the first thing to do is to try just the receiver and Opus. Make sure the opus is setup for 44.1khz PCM.
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
OK, so I just use the recommended switch settings, right?
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
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.
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
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.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 11/9/2007(UTC)
Posts: 453
Location: usa
|
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
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(+)
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
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?
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
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.
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 2,868
Location: Massachusetts, USA
Thanks: 2 times
Was thanked: 141 time(s) in 134 post(s)
|
In the S/PDIF Transceiver, set the TXSRC to +.
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
I have set the TXSRC to +, but nothing changed.
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
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).
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
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?  
|
|
|
|
|
|
Rank: Administration
Groups: Administration, Customer
Joined: 10/24/2006(UTC)
Posts: 3,979
Location: Nashville, TN
Thanks: 25 times
Was thanked: 89 time(s) in 83 post(s)
|
The output side of the switches is the pad next to the label.
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
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?
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
|
|
|
|
|
|
Rank: Advanced Member
Groups: Member
Joined: 7/19/2010(UTC)
Posts: 40
|
Could someone please help me?
|
|
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
