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Old 13th May 2012, 09:52 PM   #61
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Did a lot of prototyping this weekend and got good results. I think the separate power connectors will be only one connector in the final version as it does not bring benefits. We are still busy though, please have some patience and please try to keep emailing via PM to a minimum. Questions like "does it work with cdplayer brand x ?" will not be answered. Keep in mind this is a DIY approach and not a final product. If you are looking for that take the Ebay route.

It is a "board and ES9023" group buy. It will require SMD work and a drive to do things yourself. I assemble the DACs in a relatively short time but some parts are tiny. I can not speak for Unixdeveloper but I think pre soldering either WM8804 or ES9023 is out of the question.

This DAC is worth the hassle. I am having a good time testing them but you should definitely not listen to my prejudiced opinion and try one yourself !
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Last edited by jean-paul; 13th May 2012 at 10:02 PM.
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Old 23rd May 2012, 06:48 AM   #62
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Hi Jean-Paul,

One detail I'd like to know that I can't readily see from the pictures of the PCB is if there's a LP filter on the DAC's output.

Much thanks,
Daniel
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Old 23rd May 2012, 06:58 AM   #63
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There are 4.7 nF film caps at the outputs. No series resistors as those are already in the ES9023 chip. See the data sheet for reference.
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Old 24th May 2012, 08:29 AM   #64
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by jean-paul View Post
There are 4.7 nF film caps at the outputs. No series resistors as those are already in the ES9023 chip. See the data sheet for reference.
Hi,
Where can I find the data sheet? Or I have to contact ESS directly for it?

Best regards
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Old 24th May 2012, 08:47 AM   #65
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I'm not sure if it's still the same deal, but previously I had to sign an agreement to get access to the ES9022 data sheet.

If its about the internal series resistors in the ES9023 output, I believe that its 240 ohms.
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Old 24th May 2012, 08:53 AM   #66
syklab is offline syklab  Hong Kong
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Their Authorized Sales Representative and Distributor office in HK don't even have a email contact.
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Old 27th May 2012, 05:33 PM   #67
syklab is offline syklab  Hong Kong
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got the datasheet from one of the member.

Thanks
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Old 28th May 2012, 11:25 AM   #68
VT67 is offline VT67  Belgium
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Is there a schematic and a BOM for this DAC?

Regards
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Old 28th May 2012, 11:34 AM   #69
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Yes, please see the group buy thread. Try to have some patience as we are still working on the layout and the BOM. We will finalize this in a few days. It are only minor changes as the first revision was already OK.
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Old 28th May 2012, 11:42 AM   #70
massimo is offline massimo  Italy
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May I suggest to move C14 and C15 further apart from analog outputs? I would like to use some "fatter" pp caps (still 5 mm pitch)
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