Russ White said:
Great! That's exactly the setup I was shooting for.
Now finish it, so I can buy one! 😉
beta kits available
Ok folks, I don't any better way to do this so here is the deal.
Brian and I have enough OPUS boards and parts to sell 7 beta kits. (some were already spoken for) 5 will ship soon, the others have to wait for a shipment of DACs to get here, but they have been ordered.
Some of you have been very supportive and early on stated that you would be willing to beta test. I have tried to alert those people first by email if I could find it.
We are selling these kits below our cost to say thanks to you guys.
After these are gone we will order "production" PCBs with the little things changed we learned from this one (very minor).
The DAC works exactly as planned, and sounds (well to me) excellent.
There are some building tips here:
http://www.twistedpearaudio.com/forum/default.aspx?g=topics&f=5
Now I hope hope to hear some real reviews soon!!! 🙂
Cheers!
Russ
Ok folks, I don't any better way to do this so here is the deal.
Brian and I have enough OPUS boards and parts to sell 7 beta kits. (some were already spoken for) 5 will ship soon, the others have to wait for a shipment of DACs to get here, but they have been ordered.
Some of you have been very supportive and early on stated that you would be willing to beta test. I have tried to alert those people first by email if I could find it.
We are selling these kits below our cost to say thanks to you guys.
After these are gone we will order "production" PCBs with the little things changed we learned from this one (very minor).
The DAC works exactly as planned, and sounds (well to me) excellent.
There are some building tips here:
http://www.twistedpearaudio.com/forum/default.aspx?g=topics&f=5
Now I hope hope to hear some real reviews soon!!! 🙂
Cheers!
Russ
For the Beta kits, all the SMT parts will be premounted, unless you request otherwise. In all cases, however, the DAC chips will be premounted.
Russ, very nice kit you've made. Pitty no toslink input
I know a lot of people say its nogood/useless but in an all out network of digital signals(through the whole house) it is an much easier and a more noisefree way of transporting the signal. For a 1 source system coax is the ultimate ofcourse.
Is it possible to do a 20khz crosstalk measurement for the left and right channel? Don't know if the DAC is optimized for this? Use a double DAC?
What about output offset? Is it possible to not use caps?
PS. Just saw in the WM8740 pdf file you can use it with 2 DACS in diff. mode with L and R separated. Nice😀
Thanx,
Bert
I know a lot of people say its nogood/useless but in an all out network of digital signals(through the whole house) it is an much easier and a more noisefree way of transporting the signal. For a 1 source system coax is the ultimate ofcourse.Is it possible to do a 20khz crosstalk measurement for the left and right channel? Don't know if the DAC is optimized for this? Use a double DAC?
What about output offset? Is it possible to not use caps?
PS. Just saw in the WM8740 pdf file you can use it with 2 DACS in diff. mode with L and R separated. Nice😀
Thanx,
Bert
Bgt said:Russ, very nice kit you've made. Pitty no toslink input
Thanx,
Bert
You can very easily add toslink. It just would not be on this little PCB. 🙂
The best practical solution (currently) in my opinion would be USB to I2S, or straight I2S from source.
I have a USB to I2S add-on PCB coming very soon.
Cheers!
Russ
>You can very easily add toslink. It just would not be on this little PCB.
>The best practical solution (currently) in my opinion would be USB to >I2S, or straight I2S from source.
>I have a USB to I2S add-on PCB coming very soon.
Right now I'm trying to mount RCA (coax SPDIF), Toslink and USB connectors to my new enclosure which will have Opus, Kooka and
RevC. In addition to those connectors it has already 4 analog
RCA inputs. So, from 6 Kooka's inputs 4 serves for analog
inputs, 1 for USB and 1 for SPDIF - Coax or Toslink.
It would be great to have a small board where USB, Toslink
and probably RCA (board-mounted SPDIF coax) connectors could
be soldered. In addition to the connectors the board could also have
USB->I2S logic. +5V could also be used for Toslink converter.
>The best practical solution (currently) in my opinion would be USB to >I2S, or straight I2S from source.
>I have a USB to I2S add-on PCB coming very soon.
Right now I'm trying to mount RCA (coax SPDIF), Toslink and USB connectors to my new enclosure which will have Opus, Kooka and
RevC. In addition to those connectors it has already 4 analog
RCA inputs. So, from 6 Kooka's inputs 4 serves for analog
inputs, 1 for USB and 1 for SPDIF - Coax or Toslink.
It would be great to have a small board where USB, Toslink
and probably RCA (board-mounted SPDIF coax) connectors could
be soldered. In addition to the connectors the board could also have
USB->I2S logic. +5V could also be used for Toslink converter.
Why is USB or I2S practical? For short distances maybe but not for long distances. I think Toslink is far more practical espec. if you connect 2 or more PC's and pheripheral equipm. to a DAC through a selector. You loose a bit of quality maybe(PC outputs are dirty on RCA conn. even with transfo) but anything better than analog.
Bgt said:
Do most people run long digital cables?
As I said earlier, using TOSLINK is easily accomplished off board, no need for anything on the PCB to support it. 🙂
Cheers!
Russ
So, I have this old Sony 5-disc changer that's been hanging around in my workshop because of skipping and no real desire to fix it. So, cleaned the lens/mirror, relubed it, then disconnected all the audio bits and embedded an Opus and PS. I added a couple XLR jacks on the back and replaced the pcmount RCAs with a couple panel mounts, and supply them with +out and GND. The result is a new cd player...
Power Supply tapped off the factory trafo:
Opus DAC and XLR Jacks:
Overall:
Power Supply tapped off the factory trafo:
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Opus DAC and XLR Jacks:
An externally hosted image should be here but it was not working when we last tested it.
Overall:
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How long until there are more beta kits avaliable or until you have some final versions for purchase!
Built my Opus in a breeze but no listening tests ( yet ) as I have to build a balanced to SE convertor ......
Kit looks very nice with good quality parts. I am glad that the SMD parts are premounted as the Wolfson sure has very tiny lead wires.
Kit looks very nice with good quality parts. I am glad that the SMD parts are premounted as the Wolfson sure has very tiny lead wires.
My Opus is built but I'm still waiting on delivery (not from Twisted Pear) of a transformer and input/output connectors, which should arrive in the next couple of days. Will definitely advise when I get sound happening.
Hi Russ,
Coming late (as usual?) to this interesting DAC project. Seems to be a good candidate to replace this section on my Onkyo CD player that has an excellent transport mechanism.
I’ll be following closely the development of this nice DAC and I appreciate your effort in doing it as well as all contributions on this thread.
Waiting to hear comments on all those beta boards😎
Coming late (as usual?) to this interesting DAC project. Seems to be a good candidate to replace this section on my Onkyo CD player that has an excellent transport mechanism.
I’ll be following closely the development of this nice DAC and I appreciate your effort in doing it as well as all contributions on this thread.
Waiting to hear comments on all those beta boards😎
Russ et al-
I've been reading your thread and look forward to building one of these kits.
Thanks- Kent
I've been reading your thread and look forward to building one of these kits.
Thanks- Kent
dw8083 said:
Lets see how the tax man treats me. 🙂
I just ordered a whole slew of other (TXO related) PCBs, but if I can I will order these too. 🙂
What I am thinking is that the first non-beta PCBs will just be slightly different from the beta PCBs, the main difference being that U4 will be reworked.
I hope that those who have built the beta kits enjoy them.
Cheers!
Russ
We also have a few (I will get a count) of the beta boards left, but are out of the power supplies (which we have already ordered). When the PS come in, we can sell off the rest of the beta boards and kits if people want them.