Mr White's "Opus", designing a simple balanced DAC - Page 131

JeroenR · 27th March 2008, 03:12 PM

Quote:

Originally posted by BrianDonegan
Potted core: hole is filled with epoxy potting material with a small hole in the center for the mounting bolt.

Thanks!! So no performance improvement, just mounting convenience?

BrianDonegan · 27th March 2008, 03:22 PM

Correct.

Bgt · 28th March 2008, 08:27 AM

Quote:

Originally posted by BrianDonegan
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.

OneyedK · 28th March 2008, 08:48 AM

Quote:

Originally posted by Bgt

Even coming near with my finger kills the signal.

Did you create a ground loop in any way?

Dougie085 · 28th March 2008, 09:28 AM

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?

fierce_freak · 28th March 2008, 03:08 PM

My personal thought is that metronome + 1 opus will be better than dual opus with no metronome.

Mazuki · 28th March 2008, 03:40 PM

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?

Bgt · 28th March 2008, 08:19 PM

It is OK now, no noises or ticks anymore.
wiring is super short and most psu lines are going under the plate.
between 2 pcb's(which are on top of each other) there is a small screening plate, earthed.

Bgt · 28th March 2008, 08:26 PM

mode 0-2 setup window, its on 96khz now.

Brian, the sound is awsome

fierce_freak · 28th March 2008, 09:27 PM

Looks great

27th March 2008, 03:22 PM	#1302
BrianDonegan diyAudio Member Join Date: Dec 2004 Location: Rock Ridge	Correct. __________________ Twisted Pear Audio

28th March 2008, 08:19 PM	#1308
Bgt diyAudio Member Join Date: Jan 2005 Location: NL, Voorschoten	It is OK now, no noises or ticks anymore. wiring is super short and most psu lines are going under the plate. between 2 pcb's(which are on top of each other) there is a small screening plate, earthed. __________________ Kind regards, Bert

28th March 2008, 08:26 PM	#1309
Bgt diyAudio Member Join Date: Jan 2005 Location: NL, Voorschoten	mode 0-2 setup window, its on 96khz now. Brian, the sound is awsome __________________ Kind regards, Bert

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28th March 2008, 09:28 AM	#1305
Dougie085 diyAudio Member Join Date: Nov 2005 Location: Ohio	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?

28th March 2008, 03:08 PM	#1306
fierce_freak diyAudio Member Join Date: Jul 2007	My personal thought is that metronome + 1 opus will be better than dual opus with no metronome.

28th March 2008, 03:40 PM	#1307
Mazuki diyAudio Member Join Date: Mar 2007	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?

28th March 2008, 09:27 PM	#1310
fierce_freak diyAudio Member Join Date: Jul 2007	Looks great

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