ES9023 / WM8804 S/PDIF "Subbu DAC V3" GB Interest - Page 33 - diyAudio
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Old 30th October 2012, 10:05 AM   #321
bcmbob is offline bcmbob  United States
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OOOPS!, Just got the first post on the new thread from qusp "you do realize there is already a dac gallery? doesn't get a lot of traffic unfortunately".

That thread had eluded me but is essentially what was intended. Hopefully what is there can/will be brought to higher prominence and visibility.

Hey, at least I might have the record for the shortest lived thread on the forum.

Thread deletion request sent to admin. !!
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Last edited by bcmbob; 30th October 2012 at 10:08 AM.
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Old 30th October 2012, 10:05 AM   #322
qusp is offline qusp  Australia
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make it nearby, one for each signal wire. it still wont be properly terminated, but it will be better
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Old 30th October 2012, 07:39 PM   #323
mickie is offline mickie  Germany
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Dear qusp, / anyone

i have the problem you are describing as i implemented the DAC into a cd-player by tapping I2S from the decoder chip. I don't have any measuring-equipment but i "feel" there's a lot of hf/rf introduced.

So, can you elaborate a bit more on this topic, especially how to connect it properly, how / where do i connect the shields of the cables, what about ground-loops then; which cables should i use anyway.
I did some searches but couldn't find answers that would help me....

What i could use would be some "how to connect i2s - for dummies" guide.

Reagrds,
Mickie

Last edited by mickie; 30th October 2012 at 07:56 PM.
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Old 30th October 2012, 11:58 PM   #324
supra is offline supra  Australia
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So is there a dac board that will connect to the amanero i2s without adapters?
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Old 31st October 2012, 12:13 AM   #325
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Added myself to v3 list, thanks
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Old 31st October 2012, 12:25 AM   #326
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Quote:
Originally Posted by supra View Post
So is there a dac board that will connect to the amanero i2s without adapters?

Yes there are alternatives that do not require adapters, also, the V3 subbu dac may even be better than the v2.6 dac in this regard ... none of us know about the changes to V3 at this stage so it'd be rather premature to criticise a design that is unfinished and that we haven't seen!
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Old 31st October 2012, 12:32 AM   #327
supra is offline supra  Australia
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Quote:
Originally Posted by hochopeper View Post
Yes there are alternatives that do not require adapters, also, the V3 subbu dac may even be better than the v2.6 dac in this regard ... none of us know about the changes to V3 at this stage so it'd be rather premature to criticise a design that is unfinished and that we haven't seen!
Yes I have ordered a couple of sets of V3 but also interested in alternatives, I guess the Buff3 is one of them, what are the others?
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Old 31st October 2012, 12:34 AM   #328
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Quote:
Originally Posted by mickie View Post
Dear qusp, / anyone

i have the problem you are describing as i implemented the DAC into a cd-player by tapping I2S from the decoder chip. I don't have any measuring-equipment but i "feel" there's a lot of hf/rf introduced.

So, can you elaborate a bit more on this topic, especially how to connect it properly, how / where do i connect the shields of the cables, what about ground-loops then; which cables should i use anyway.
I did some searches but couldn't find answers that would help me....

What i could use would be some "how to connect i2s - for dummies" guide.

Reagrds,
Mickie
I don't have time for a detailed post right now. Maybe tonight I will if others haven't answered already by then. There have already been some suggestions in this thread, and references to other places it has been discussed previously.

In essence I apply the theory, if it looks like it might be an antenna, then it probably is.

The following is a general comment and does not relate to this DAC in any specific way.

Remember that, in general, this is not only the wiring layout, the PCB layout must be done in such a way to reduce the susceptibility to noise. The PCB layout must also be done in such a way as to not pollute its local environment by producing noise.

The broader issue I am referring to is known as EMC, which is a highly detailed field and I do not pretend to be an expert, not many people are experts on these issues in totality. I am hoping to buy this book in the next few months to help my own understanding of these things, obviously not everyone is keen to sit down with a 900+ page tome on EMC though.

Chris
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Old 31st October 2012, 12:37 AM   #329
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Quote:
Originally Posted by supra View Post
Yes I have ordered a couple of sets of V3 but also interested in alternatives, I guess the Buff3 is one of them, what are the others?
There is also the newer revisions of the ackodac boards for the ES9023 and the ES9016 DAC chips that provide through hole i2s terminations as well as the u.fl or w.fl sockets.

I think EUVL / xen audio also offer one off boards that may meet your requirements, send them a PM.
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Old 31st October 2012, 03:30 AM   #330
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To save myself some typing, I found this article on dipole antenna theory and high frequency signal routing in electronics design - http://www.hottconsultants.com/pdf_files/dipoles-1.pdf

It does a much better job than I could of explaining the reasons why termination and consideration of all high frequency signals such as i2s is so critical.

The intro to the article says:

Quote:
An understanding of some basic antenna theory would be helpful for all engineers,
especially those involved in EMC. After all, if a product radiates (or is susceptible to RF
energy) it is an antenna even if you call it something else -- such as a microprocessor, an
IC, a PCB, a power cord, or an RS-232 cable.

And the case for u.fl and other RF connectors rather than normal wires used for i2s signals is most succinctly made on the last page in this quote:
Quote:
Last, but not least, we could shield the cable and terminate the shield properly (360 degree connection) to the chassis. In this case the cable effectively does not leave the enclosure. You can think of the cable shield as just an extension of the chassis, and how well it does or doesn’t behave in this manner is a strong function of the shield to chassis connection.
In the above quote the term chassis could be replaced by PCB ground plane for the purpose of these discussions.
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