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Old 19th May 2006, 06:16 PM   #31
KOHTOPA is offline KOHTOPA  Europe
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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.
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Old 19th May 2006, 06:18 PM   #32
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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
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Old 19th May 2006, 06:28 PM   #33
KOHTOPA is offline KOHTOPA  Europe
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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?
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Old 19th May 2006, 06:34 PM   #34
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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
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Old 19th May 2006, 06:37 PM   #35
KOHTOPA is offline KOHTOPA  Europe
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I'm just wondering should I do it myself or wait
till you finish it
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Old 19th May 2006, 06:41 PM   #36
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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.
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Old 19th May 2006, 06:52 PM   #37
KOHTOPA is offline KOHTOPA  Europe
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> 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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Old 28th May 2006, 07:22 AM   #38
awpagan is offline awpagan  Australia
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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
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Old 28th May 2006, 07:46 AM   #39
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Allan, you didn't read this thread did you?

Post 22
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Old 28th May 2006, 08:39 AM   #40
awpagan is offline awpagan  Australia
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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
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