Mr White's "Opus", designing a simple balanced DAC - Page 4

KOHTOPA · 19th May 2006, 07:16 PM

Does it make sense to make Lego style DAC with
interchangable modules? For example

- input module/board - separate board for SPDIF to I2S convertion,
separate module for USB to I2S conversion etc.
- DAC itself, with various boards based on different chips WM8740,
PCM1794, CS4398, TDA15xx etc.
- filter, different flavors
- output stage, different solutions - SE, differential etc.
- power supplies, different solutions/boards for analog/digital
sections.

This way it would be easy to experiment by changing different
components. You shouldn't buy/design SPDIF->I2S conversion part
again and again, the same for filter and output stage.
I know that it's a challenge to make such design but I believe
it should be doable, smth. similar to the latest DDDAC Mk2 but
with absolutely all components in this equation in a modular
form.

Russ White · 19th May 2006, 07:18 PM

Quote:

Originally posted by KOHTOPA
Does it make sense to make Lego style DAC with
interchangable modules? For example

absolutely all components in this equation in a modular
form.

Yes,

Thats the whole idea. But in my case I will simply be starting with the Wolfson DAC. Later I may try others.

Cheers!
Russ

KOHTOPA · 19th May 2006, 07:28 PM

Russ,
Do you make all those functional blocks easily detachable?
What is a form factor for those separate modules? Did you
place power supply(s) on the same board?

Russ White · 19th May 2006, 07:34 PM

None of them are finalized yet.

But all of the parts I have designed so far are 4" x 1.5" form factor designed to stack. Power supplies would be seperate or optional if on-board.

Cheers!
Russ

KOHTOPA · 19th May 2006, 07:37 PM

I'm just wondering should I do it myself or wait
till you finish it

Russ White · 19th May 2006, 07:41 PM

Well the basic DAC board is 90% done, but optimizing the layout a bit.

I also have a balanced filter/linedriver PCB to go with it which I will be testing this evening.

A USB/I2S converter is next in line.

Later I will do an improved S/PDIF receiver PCB whcih can be used in place of the basic S/PDIF input of the basic DAC PCB.

KOHTOPA · 19th May 2006, 07:52 PM

> Well the basic DAC board is 90% done, but optimizing the layout a
> bit.

> I also have a balanced filter/linedriver PCB to go with it which I will
> be testing this evening.

> A USB/I2S converter is next in line.

> Later I will do an improved S/PDIF receiver PCB whcih can be used
> in place of the basic S/PDIF input of the basic DAC PCB.

Great progress. I'll wait

Though I'm more interested in USB->I2S because I was able to make
it properly work in my Linux machine. I had some problems with
SPDIF.

awpagan · 28th May 2006, 08:22 AM

who can supply the wolfson dac? besides wolfson!

I am interested in doing some experiments with this dac also.
i2s>dac> passive filter> simple (discrete)buffer.

Russ
any updates on your project?

allan

pinkmouse · 28th May 2006, 08:46 AM

Allan, you didn't read this thread did you?

Post 22

awpagan · 28th May 2006, 09:39 AM

Quote:

Originally posted by pinkmouse
Allan, you didn't read this thread did you?

Post 22

Yes i had been.
Tried that site weeks ago and it looked as if it was still being built.
couldn't find refer to wm7840.

just tried again and no problems now.

allan

19th May 2006, 07:34 PM	#34
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	None of them are finalized yet. But all of the parts I have designed so far are 4" x 1.5" form factor designed to stack. Power supplies would be seperate or optional if on-board. Cheers! Russ __________________ Less pulp more juice Twisted Pear Audio.

19th May 2006, 07:41 PM	#36
Russ White diyAudio Member Join Date: Jan 2005 Location: Nashville, TN, USA	Well the basic DAC board is 90% done, but optimizing the layout a bit. I also have a balanced filter/linedriver PCB to go with it which I will be testing this evening. A USB/I2S converter is next in line. Later I will do an improved S/PDIF receiver PCB whcih can be used in place of the basic S/PDIF input of the basic DAC PCB. __________________ Less pulp more juice Twisted Pear Audio.

28th May 2006, 08:22 AM	#38
awpagan diyAudio Member Join Date: Nov 2004 Location: sydney	who can supply the wolfson dac? besides wolfson! I am interested in doing some experiments with this dac also. i2s>dac> passive filter> simple (discrete)buffer. Russ any updates on your project? allan __________________ Indecision makes the world gone round. Maybe

28th May 2006, 08:46 AM	#39
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	Allan, you didn't read this thread did you? Post 22 __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

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19th May 2006, 07:16 PM	#31
KOHTOPA diyAudio Member Join Date: Mar 2006 Location: us	Does it make sense to make Lego style DAC with interchangable modules? For example - input module/board - separate board for SPDIF to I2S convertion, separate module for USB to I2S conversion etc. - DAC itself, with various boards based on different chips WM8740, PCM1794, CS4398, TDA15xx etc. - filter, different flavors - output stage, different solutions - SE, differential etc. - power supplies, different solutions/boards for analog/digital sections. This way it would be easy to experiment by changing different components. You shouldn't buy/design SPDIF->I2S conversion part again and again, the same for filter and output stage. I know that it's a challenge to make such design but I believe it should be doable, smth. similar to the latest DDDAC Mk2 but with absolutely all components in this equation in a modular form.

19th May 2006, 07:28 PM	#33
KOHTOPA diyAudio Member Join Date: Mar 2006 Location: us	Russ, Do you make all those functional blocks easily detachable? What is a form factor for those separate modules? Did you place power supply(s) on the same board?

19th May 2006, 07:37 PM	#35
KOHTOPA diyAudio Member Join Date: Mar 2006 Location: us	I'm just wondering should I do it myself or wait till you finish it

19th May 2006, 07:52 PM	#37
KOHTOPA diyAudio Member Join Date: Mar 2006 Location: us	> Well the basic DAC board is 90% done, but optimizing the layout a > bit. > I also have a balanced filter/linedriver PCB to go with it which I will > be testing this evening. > A USB/I2S converter is next in line. > Later I will do an improved S/PDIF receiver PCB whcih can be used > in place of the basic S/PDIF input of the basic DAC PCB. Great progress. I'll wait Though I'm more interested in USB->I2S because I was able to make it properly work in my Linux machine. I had some problems with SPDIF.

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