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

BrianDonegan said:
Hi Bert-

Usually this type of noise is caused by interference between the power wiring and the I2S wiring, or power wiring too close to clock traces on the board(s).

From your pictures, my guess is that the source of your noise is one of the wires in this picture:

Brian, it does not change the problem if I put the wires differently.
Have to redo the position of the 8804 and metronome boards I guesss. It is the highest freq. line from the 8804 board to the metronome that causes most problems.
Even coming near with my finger kills the signal.
 
Kind of thinking about just getting an Opus for the time being. My question is what would be the more rewarding choice, going with dual mono DAC's or a single DAC with a Metronome? I'll be using the USB for now... so not sure jitter is AS big of an issue as if I was using it for a CDP. Eventually I will add the SPDIF module though. Also I might swap it out for the Sabre depending. I'm just getting a bit fedup with the sound from my sound card and not sure I can wait for the Sabre 🙂

Was also wondering do you think the COD is better then the Opus? Do you like the BurrBrown DAC better then the Wolfson? They are both oversampling yes?
 
I was thinking about buying the USB receivers to interface with a SAA7220+TDA1541A. I'm just not sure about the I2S output of the USB receiver. If it outputs in 24-bit I2S, will the SAA7220 still recognise the signal? Can I set the PCM2707 to output 16/44.1khz?
 
I think I'll do dual mono's as with the PC I don't think jitter is as big of an issue. Later I'm going to upgrade the DAC's to the Sabre's if they can be run in mono mode then I'll use 2 of them. After that I may add the Metronome if its an improvement to the Sabre's clock.

Sound like a good idea?
 
Hi Dougie,

Honestly, the metronome will be a bigger improvement. You'll be getting plenty of jitter from your PC.

With the Sabre, you won't need to parallel it as it already contains 4 stereo DACs! Plus the it has it's own in-built ASRC, so the metronome will not be required.
 
Dougie085 said:
Well then I probably shouldn't purchase the Metronome as eventually I won't be using it. My friend might purchase the DAC boards when I upgrade to the Buffalo's.

That makes sense. Your friend will be getting a good DAC, but the Sabre is rather special.


fierce_freak said:
They improved the Sabre by using a better external XO for use by its internal ASRC. One of the things that makes the Sabre so attractive aside from its impressive numbers is the inclusion of receiver and ASRC.

I'm a little confused ... who is "they"? RossL and I have reported mods to the Sabre eval board in the ESS thread. Has anyone else reported anything?