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ES9023 / WM8804 S/PDIF DAC Group Buy

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#666
Hello.

I found this project for the first time. It looks interesting but I have few questions about pcb and schematic which i wasn`t able to find:

how much improvement gives separate power supply for each section : 2 for WM8804 and other for ES.

does the PCB for this project has separated ground plane for DGND and AGND?
 
#667
Hi kopczas

Schematics are provided to GB buyer's, SPDIF PCB is now published.

Have a look there for the SPDIF version : http://www.diyaudio.com/forums/grou...-wm8804-spdif-power-supply-pcb-group-buy.html

I hope the I2S version to be available soon.

There are 5 LDO used (3.3 & 3.6v) MIC5205 for each section of the DAC.
Difficult to say how much improvment they give, and compare to what ?
I can say this DAC sounds pretty good, such as V2.6 does 😉
About separate ground plane (D & A) I prefer designers to give you the answer.

Regards

Phil
 
#668
Hello korben,
is was thinking about externa,l complitly independent discrete power sources (with separate rectifiers) like super teddy reg etc.
Ok, I will ask somewhere else about separate groud planes(it`s one of the most important things; for me it`s obvious D & A ground should stand alone).

Thank you for your answer.
 
#675
JP: This question maybe is answered already, but i haven't read through the whole thread since i lost interest when it became a SPDIF-version. But what i wonder is - will there be a I2S-version soon? and will there be a balanced version also?
 
#676
Good question as there are enough alternatives with ES9023 and I2S already. To be honest I am glad we have the SPDIF version ready at last. We will have to respond to this question shortly.

The BAL version was a Subbu only affair till now so I can not answer that one. I will ask Subbu for the BAL version.
 
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#677
korben69 said:
Hi skouliki

C10 & R11 seems fine to me, close values.
C11 is different as I've got -2.20/1.25 vs -1.70/1.73 ; 0.5V lost somewhere, check it 😉
Is it due to Pin16 = 0v ? C11 seems to be a dedicated internal ES9023 cap.

ES9023 Pins
Pin1 -> R7______________Pin16 -> ?
Pin2 -> R8______________Pin15 -> R13
Pin3 -> R9______________Pin14 -> Gnd
Pin4 -> Gnd/C10_________Pin13 -> R12
Pin5 -> C10b+___________Pin12 -> Gnd
Pin6 -> R11/C9__________Pin11 -> C12/C32-
Pin7 -> R15/C15Gnd______Pin10 -> C11
Pin8 -> R14/C14Gng______Pin09 -> C11

Pin16 is 0v on your DAC, it seems to be faulty but on the scheme there is no connexion shown... 😕
Your DAC values seems fine to me, except Pin16 and previous remark about C11.
Maybe someone more skilled than me could give an helping hand. :wave2:
Click to expand...

HI Jean-Paul,

Nice to hear from you. My problem is similar to Skouliki, see above measurements. Not sure if Skouliki fixed his problem on his DAC.

I'm looking for the schematic since I can't find where C12 is connected? Based on the previous responses/threads, the C12 is soldered on the back of the pcb in parallel with C32, is that right? This is what I'm trying to find out but can't find the schematic. I also checked all the voltages based on Korben's measurement and it matched all of them except C11. I will try to dig in more tomorrow when I have time to find out the problem, but if you guys have the answer then I would greatly appreciate it.

Fred
 
#679
Hi.
The problem i had turned out to be a bad solder joint in one of the pins of WM8804 but cant remember which one, since it was many months ago.
I must also say congratulations to Jean-Paul and Subbu for creating this dac.
It sounds great indeed
 
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