Secret project (Svart AD/DA converters)

It's not common, that's for sure.  A single proper low noise supply should be good enough.  We're not talking high power levels with a lot of crosstalk here.

That being said, using two regulators isn't a big deal, but there is also a common VCC between the dac outputs.  The datasheet doesn't specify why it's a different input though.  

What I'm concerned about is that if any regulator is slightly off and there are internal junctions, then currents will flow improperly and we'll get worse performance than using a single supply.  

It's more on the speculative side.
We immediately noticed the spectral balance and stereo image changed to the better in the Superbeast.
As jimwilliams stated, the opamps used by his recommendation have the ability for handling the more power-demanding low end with more fidelity than other opamps, which does result in a superior spectral balance. How far the dual chip design in the Superbeast adds more to the stereo image than the improved low end transients alone, which will better the stereo image, too, is unknown to me, i just can't compare, because don't have the standard version with upgraded opamps, which would separate the featured upgrades of the Superbeast...

If you don't like rap you could get the poptor or the jazztor Or if you have nit's the indietor

I suggest for the name you call all your manufactured devices SVART.

Then for this first model you give it the model name RGO.

So your convertor would be the SVART RGO


cheers

Wiz

How about "Svargo" and use a logo of a lower leg/foot being shoved into a converter box 8)

it's just a phase i'm going through... i'll stop soon, i promise 8)
daffy's classic, though.. thinking of dan going to get the mail like that was a great one 8)

No problem for me. Just let your ADD show up in endlessly moving gifs as long as it's entertaining like this - makes me smile, really.

It won't have a wordclock output if that is what you mean.  At least this version won't.  

The SPDIF stream has timing built into the signal which can be used to clock other converters if they see the SPDIF signal.

Typically you'd slave your soundcard (or whatever your SPDIF receiver is) to the SPDIF stream from the ADC.  The DAC should sync and slave itself to the SPDIF signal coming into it as well.  So in this case, both the soundcard and DAC are clocked by the ADC.

So the ADC boards and the front panel boards have been shipped. I won't see them until probably next week though.

I already see one or two issues with the ADC boards that need fixing.

Also, I'm wondering if I shouldn't change the ADC layout entirely. I've found some good small LDO regulators and have switched to point-of-load regulation on the DAC board to make things a little more local to the parts. I might want to do the same thing with the ADC board to better some of the things I did on it.

I might be too anal about it though. I keep wanting to do things very tightly and neatly due to having to do that kind of thing on RF designs for so long. Now that I'm working on a low speed project, most of the things I'd worry about don't matter at all!

In other news, water is wet.

So that's it for today's work I think, time to leave work and go to the store and get T'day fixings for when the folks come into town.

Today I got the Wolfson SPDIF transceiver drawn and into the schematic.  I also got the PCM1794A drawn and into the schematic.  I got most everything hooked up between the SPDIF and analog outputs for one mono channel (or a single stereo DAC if it happens that way).  Now I need to go through the nets and make sure I have everything the way I want it. I also need to choose a clock source for the Wolfson part.

There really isn't that much to do software wise with this board even though it's more complex than the ADC board.  It mostly syncs up to the SPDIF signal that is sent to it.  There are a few hardware configuration pins, but I don't forsee needing to change those on the fly for any reason.  I might bring them into the microcontroller anyway, just in case.

There is an "UNLOCK" output from the wolfson part.  I might see about using that to drive the MUTE pin of the PCM1794 chips so that it automatically mutes the outputs if it loses lock.  Otherwise it might give a loud and annoying HISSSSSSSS.  Unsure it will do that though.

Your Idea of to anal means get it right now!
In the grand old days that was called product development !
Relax while most of us can't offer much as far as the circuit , we are here to help, and there is a lot of talent here, and all we want is to be able to buy and recommend a decent piece of gear.

any ideas on the name yet? I swear that RGO Speedwagon is really cool for some reason, really. What's your last name Chris? maybe we can brainstorm something with your surname?

here's some that i like
RGO Speedwagon
Svargo
ADChrisuperDAC