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Mr White's "Opus", designing a simple balanced DAC

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Russ White

Russ White

Member
Joined 2005
twistedpearaudio.com
Re: Is there a wiring diagram

DarrenWadsworth said:
I have one spdif reciever, 2 dac boards and one LCPS. Eventually I want to add a USB reciever board.

1st. Can I use the LCPS for the first 3 things? If so, is there a wiring diagram that can show me what goes where. I have this, but it is only for single DAC:

Will I need to change any of that if I get the USB module?

Thank you

Darren
Click to expand...


You just need the one PS nothing more. :)

Just run a second set of wires to your second DAC, just like the diagram you posted is fine.

You won't need to change anything power supply wise for the USB module.

Cheers!
Russ
 
ichiban

ichiban

Member
Joined 2004
Paid Member
Opus Met problem

I have the SPDIF Rcvr>Met>Opus set up into an LM4562 preamp.

It had been playing superbly, then when turned on one day the
system was giving out a low EEEEEE sound? Swapped equipment,
still there. The noise plays thru regardless of which input I have
selected? :xeye:

I disconnected power to the whole Opus board setup
and the noise is gone.

Any ideas.
 
ichiban

ichiban

Member
Joined 2004
Paid Member
Re: Re: Opus Met problem

Russ White said:


That sounds sorta like oscillation/ motorboating...

I would need to know more about how you have it setup.
Click to expand...


So, I connected the Opus outputs directly to the output rcas
and ran that into the My-Ref. Same thing, EEEEEEEE. Note, when
going thru the Selector>VolCtl>PreampSection it made no difference
whether the dac was selected? and the EEEE amplitude did not
vary with vol setting?

I'm going to change the setup to RCVR>OPUS leaving out the MET
and see/hear what happens.

The power supplies for the preamp and digital boards are separate
and grounds connect at the volctl ground.

This is very odd, as I've said it was playing fine the night before
then :bigeyes: no changes between!?

WM8804 RCVR
AIFCONF1 - HI
All Others - LO

OPUS DAC
I2S - HI
DM1 - LO
DM0 - LO
MUTEB HI
MODE LO
IWO - HI
All Others - Not Jumpered

MET ASRC
AUTOMUTE Jumpered
RDY Not Jumped
OWL1&2 LO
OFMT1 LO
OFMT0 HI
MODE0&1 HI
MODE2 LO

IFMT1&2 HI
IFMT0 LO
BYPASS HI
All Others Not Jumped
 
ichiban

ichiban

Member
Joined 2004
Paid Member
Re: Opus Met problem

OneyedK said:


IFMT2 : LO
IFMT1 : LO
IFMT0 : HI
Bypass : LO

Is the way to go...
--> you selected 20-bit right justified and then put the asrc in bypass mode...
Click to expand...


Ooops! I posted those just the opposite of what they are. :rolleyes:
I did a quick look to post them and thought those jumpers
(+)(-) were the same as the row on the left side. Now I
see the (+) pins are all toward the center of the board.
Anyway thanks for the response.
 
D

DarrenWadsworth

Member
Joined 2005
Re: Is there a wiring diagram

DarrenWadsworth said:
I have one spdif reciever, 2 dac boards and one LCPS. Eventually I want to add a USB reciever board.

1st. Can I use the LCPS for the first 3 things? If so, is there a wiring diagram that can show me what goes where. I have this, but it is only for single DAC:

An externally hosted image should be here but it was not working when we last tested it.


If not, what will I need to get?

Will I need to change any of that if I get the USB module?

Thank you

Darren
Click to expand...

I forgot to ask how the spdif board connects to the 2 dacs in dual configuration.

And how eventually the USB module and spdif module can be connected to a switch.

Please help with this. I am finally going to build this thing the weekend of the 22nd

Thank you

Darren
 
D

DarrenWadsworth

Member
Joined 2005
Russ White said:
Daren, just connect two sets of wires from the "DOUT" terminal block. One set going to each DAC.
Click to expand...

I feel like such an idiot (ignorant). It seems that no one else is asking these rudimentary questions.

I guess if there were complete instructions for connecting in dual diff mode, I would be ok. I am currently compiling pictures, diagrams and instructions from all of the thread responses. All of your help has been greatly appreciated.

Except that after looking at my "notes" and a pic of a setup from this forum, I see also that the output to the XLR sockets is not what I expected. As all of the terminals are used for each channel. With some of the wires joined. Could you please tell me the proper way to connect the DAC to the channels for dual differencial mode?

Thank you for your help. Hopefully when all is said and done, I might be able to help others on this thread.

Darren
 
Russ White

Russ White

Member
Joined 2005
twistedpearaudio.com
No worries Darren,

The opus manual covers some of the differential(mono) issues.

The output terminals are switched a bit when you run that mode, so you have to check the polarity from the data sheet which is also in the manual.

I will admit the manual is sparse. I will do what I can to help.

This is a pretty advanced project,with a lot of elements still very much up to the builder.

Cheers!
Russ
 
ichiban

ichiban

Member
Joined 2004
Paid Member
Re: Re: Opus Met problem

Russ White said:


That sounds sorta like oscillation/ motorboating...

I would need to know more about how you have it setup.
Click to expand...


So, I pulled the MET out of the chain reconfigured the jumpers
and the RCVR>OPUS plays fine.
Note: some of the jumper settings in the previous post
were incorrect, these jumpers should have been
WM8804 RCVR
AIFCONF1 - HI
TXS - HI
AIFCON1 - LO
AIFCON0 - HI
MET ASRC
IFMT1&2 LO
IFMT0 HI
BYPASS LO
All Others Not Jumped
 

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Russ White

Russ White

Member
Joined 2005
twistedpearaudio.com
Re: Re: Re: Opus Met problem

ichiban said:



So, I pulled the MET out of the chain reconfigured the jumpers
and the RCVR>OPUS plays fine.
Click to expand...

Reconfigured which jumpers?

How do you have MODE setup on the metronome?

Have you double check power supply wiring etc?

Also did you remember to only wire the bitclock, wordclock, data, and gnd from the receiver into the metronome?

Cheers!
Russ
 
ichiban

ichiban

Member
Joined 2004
Paid Member
Re: Re: Re: Re: Opus Met problem

Russ White said:


Reconfigured which jumpers?

--- Jumpers were reconfigured for the RCVR>DAC configuration
having pulled the MET to see if it was ? the culprit.
As stated in post #1031 the RCVR>DAC works.
I will reverse the process and reinstall the MET and see
if by some magic it works!! Tomorrow.

How do you have MODE setup on the metronome?

--- MODE0&1 HI
MODE2 LO

Have you double check power supply wiring etc?

---Well, before removing the MET, I verified 7.5v to the met.
Verified ps-reg analog and digital voltages were 7.5v. Could not
check voltages at RCVR/DAC because of the stacked boards.
It's possible that in removing the MET and resetting
connections from RCVR to DAC and rechecking/resetting
ps wires that may have corrected a problem there!? Could
that have caused the supposed oscillation?

Also did you remember to only wire the bitclock, wordclock, data, and gnd from the receiver into the metronome?

--- Yes, as I've said the MET was working fine, (after making corrections as per your email back on 11/29/07, correcting jumpers
and connections). Just turned on the system a few days ago and
it was giving out the 'EEEEEEEEEEEEEE'.
Click to expand...

This is the way the jumpers 'were set' (corrected from post #1024)
when the MET 'was incircuit' and whatever was malfunctioning

WM8804 RCVR
AIFCONF1 - HI
TXS - HI
AIFCON1 - LO
AIFCON0 - HI

OPUS DAC
I2S - HI
DM1 - LO
DM0 - LO
MUTEB HI
MODE LO
IWO - HI
All Others - Not Jumpered

MET ASRC
AUTOMUTE Jumpered
RDY Not Jumped
OWL1&2 LO
OFMT1 LO
OFMT0 HI
MODE0&1 HI
MODE2 LO
IFMT1&2 (corrected) LO
IFMT0 (corrected) HI
BYPASS (corrected) LO
All Others Not Jumped

I Thank you for your help. Hoping when I reinstall the
MET it will work and the problem was just a
jiggly wire. Somehow I doubt it. :xeye:
 
Russ White

Russ White

Member
Joined 2005
twistedpearaudio.com
Re: Re: Re: Re: Re: Opus Met problem

OneyedK said:


A little question, might be stupid...

Why do we have to connect the gnd from rec to met and from met to DAC?
How are the gnd's used on every single board?

Thanks!
Click to expand...


The boards were made so that you could use separate supplies for each board if desired. That is why there are GND terminals at inputs and outputs. But like Brian said, if they all share a common GND at the power supply, then you don't need to wire the other GNDs. What you do need to do is check that all of the boards share a common GND.

Cheers!
Russ
 
ichiban

ichiban

Member
Joined 2004
Paid Member
Re: Re: Re: Re: Re: Opus Met problem

:clown: Well, put the MET back in and no odd noise. :clown:

When reassembling the ps wires I noticed where I had to insert
three pairs for the digital supplies they could pull out very easily.
The wires are silver coated copper strands. Decided to solder the
bundle together. How a wire could have worked loose on its own
while inside an enclosed case is unknown. I also noticed the
Teflon insulation was ragged on a couple of wires and not cleanly cut
leaving a little tab of insulation. How it all worked for two weeks
and then went south? :xeye:

Thanks to all for your help.
 
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