Mod for DVD player Hi-Rez stereo PCM output - SACD DVD-A HDCD

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#162
abq-pete

The Wolfson 8804 spdif part is actually a transceiver - it can operate as either an xmitter or a receiver (or both simultaneously in some cases). I'll have to download the datasheet to identify the specifics, but the appropriate lines are available on jumpers to configure it for master mode (ie transmitter). In this case you run the I2S clocks as input into the board rather than as output.

Since I haven't actually tried it yet, there may be something I'm overlooking, but Russ informally indicated that it should work, so I'm optimistic.
 
#164
rossl said:
let me know if it works.

Either solution would work. Except I don't have any PC boards left and if Twisted Pair has a solution, then I will suggest we use theirs. 😀
Click to expand...

This was basically my thought - making up the run of boards and managing the 'group buy' was very generous, but I didn't get the impression you were overly eager to repeat it. The Twisted Pear guys make good stuff, and the boards come fully assembled. Hard to go wrong if it works.

I'll report back when I get time to try it. May be a couple weeks, though.
 
#165
dwk123,

I've been in touch with Russ at Twisted Peach. At first he seemed confident that it would work. Then he saw many issues. At this point he is not sure that it will work but is investingating further.

Here are (IMHO) the pros of the different approaches:

rossl version:
Sample rate conversion and transmission all in one board
Support for AES/EBU outputs

Twisted Peach version (assuming it will work):
Fully stuffed and tested board
Readily available without group buy

After more research, I found this supplier:

http://audiopraise.com/vanity/overview.php

Regards, Peter
 
#167
This had a F4558 cheap dual opamp, which again was swapped with a BurrBrown OPA2604 dual FET opamp. The coupling caps between the DAC and opamp were replaced with Nichicon Fine Gold 100u/16V, and the coupling caps between opamp and output were exchanged with Black gate 100u/16V.

Hi Elecon,

I also want to modify my Oppo 981 in this way. Because of the work involved I did not want to replace all 4558 Opamps. I assume that the one to replace for two channel output is the right most opamp looking at the DVD from the front. Is this correct?
As I am not using multi-channel setup there is no need to replace all of them.

Thanks for the help,
ronenash
 
#168
Scientific Conversion Transformer Group Buy

Rossi,

I've been a silent member for some time. I stumbled upon this discussion "Googling" for a SC947-02. If a group buy occurs I would like to purchase four (4) transformers. If prepayment would facilitate the "buy", I would do so. Thank you


HEB
 
#170
dwk123 said:
abq-pete

The Wolfson 8804 spdif part is actually a transceiver - it can operate as either an xmitter or a receiver (or both simultaneously in some cases). I'll have to download the datasheet to identify the specifics, but the appropriate lines are available on jumpers to configure it for master mode (ie transmitter). In this case you run the I2S clocks as input into the board rather than as output.

Since I haven't actually tried it yet, there may be something I'm overlooking, but Russ informally indicated that it should work, so I'm optimistic.
Click to expand...


rossl said:
let me know if it works.

One of my boards could be built up without an ASRC chip. 3 or 4 wires would have to be jumpered past the missing chip.

And, the oscillators would not be needed.

Either solution would work. Except I don't have any PC boards left and if Twisted Pair has a solution, then I will suggest we use theirs. 😀
Click to expand...


Hey guys, the WM8804 transceiver board does work quite well for what you wish to do. It should actually be a very very simple mod.

You could also use it in conjunction with the 'Metronome' module if you wish to re-clock to 192/24. The Metronome board has selectable bypass, so you could run with or without re-clocking.

You can read about my test rig here:

http://www.diyaudio.com/forums/showthread.php?postid=1356438#post1356438

I may just mod one of these myself.

And yes, we do have them in stock too.

Cheers!
Russ
 
#171
Russ White said:






Hey guys, the WM8804 transceiver board does work quite well for what you wish to do. It should actually be a very very simple mod.

You could also use it in conjunction with the 'Metronome' module if you wish to re-clock to 192/24. The Metronome board has selectable bypass, so you could run with or without re-clocking.

You can read about my test rig here:

http://www.diyaudio.com/forums/showthread.php?postid=1356438#post1356438

I may just mod one of these myself.

And yes, we do have them in stock too.

Cheers!
Russ
Click to expand...

OK, that's cool. What ASRC chip did you use?
 
#173
Hi Russ,
I just tried to order one each of your metronome and S/PDIF receiver modules.
It seems that Paypal have forgotten you?? "Page Not Found" error when I log in to Paypal via the checkout.

anyways a couple of questions:
1. do all the boards come with data sheets for configuring and connecting, and,
2. If I get the S/PDIF input module and fit my own TOTX179L will this work for a second (better quality) output for the Oppo, or do you recommend a better TX?

thanks
 
#174
Pulse-R said:
Hi Russ,
I just tried to order one each of your metronome and S/PDIF receiver modules.
It seems that Paypal have forgotten you?? "Page Not Found" error when I log in to Paypal via the checkout.

anyways a couple of questions:
1. do all the boards come with data sheets for configuring and connecting, and,
2. If I get the S/PDIF input module and fit my own TOTX179L will this work for a second (better quality) output for the Oppo, or do you recommend a better TX?

thanks
Click to expand...

Hi,

I am not sure what is up with the site. I will consult with Brian, he runs the website.

1) Yes, for most of our modules we have manuals, some of the modules are so new that they don't have manuals yet, but they are pretty easy to setup if you just look at the datasheets for the devices the modules are based on. Example would be the ASRC board which is basically a first run (I got some extra prototype boards) it has no manual yet. But I will support you via email if you need it, and there will be a manual soon.

2) Probably would go use COAX. The transceiver board is designed to output to COAX out of the box. If you want TOTX you would have to implement that on your own. I don't really have a recommendation, Toshiba has a nice product card that should help you choose though.

Cheers!
Russ
 
#178
It looks like there is a different signal naming convention between what the Wolfson chip uses and what the Oppo has marked on the DV981HD controller board.

Just a heads up for you guys getting the module from Twisted Pear.

The Oppo SCK signal should go to BCK on the Twisted Pear module.
The Oppo MCLK signal should go to SCK on the Twisted Pear module.
The Oppo WS signal should go to LRCK on the Twisted Pear module.
The Oppo DATA0 signal should go to DIN on the Twisted Pear module.

and of course, the grounds should be connected.

The 5V from the Oppo board should do fine for the V+ power input.

That's what it looks like from looking at the data sheets, anyway. I don't have the module to try out yet. I may be confused, though... The Wolfson data sheet is not very clear on configuring for hardware mode.
 
#180
I received the board from TwistedPear Audio today. As I am only interested in native signals (non-upsampling), I only ordered the S/PDIF Receiver Module.

Since I had already prepped the Oppo 981 with wiring, it was just a matter of finding a place to attach the board and hook up the wires. Within a few minutes I was ready to sample Hi-Rez PCM. Yikes! There were a lot of problems with the sound. It was as if it was clipping. I tried the player on another system. Same result. I was a bit bummed out. Then I remembered the configuration jumpers on the board. I had only set the master/slave jumper, leaving the rest at their defaults. I unplugged the unit and changed the jumpers that control the audio interface (AIF_CONF). These switch between 16-bit I2S, 24-bit I2S, 24-bit left justified with flags, and 16-bit right justified. After making the correct selection I am now enjoying some very nice music!

If you want a similar configuration, run out and get this board and an Oppo 981 immediately. Truth be told, I also purchased a 970 for the modification but was very frustrated with trying to find suitable locations to attach the signal wires. It would have been nice if Oppo had placed the same headers on the 970 as I only want the audio portion and not pay for the Faroudja video chipset.

I will attach some pictures later tonight...

Regards, Peter
 
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