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Old 5th October 2012, 05:55 AM   #591
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This is what I expected. I am glad you found the problem and that you like the DAC. Give it some days, you will see that it will be even better then. Please solder C8 and C19 in place but I would like to advise to use new parts and not reuse the old ones as they might be overheated. Well, just assume they are not OK and replace them anyway as they are cheap. Change C8 for a tantalum 4.7 F 10 V cap !!
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Last edited by jean-paul; 5th October 2012 at 05:58 AM.
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Old 5th October 2012, 06:42 AM   #592
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Please check polarity of C8 if you will be using a tantalum cap. Since you heated the PCB a few times I guess it is the last chance before tracks will be peeling off.

Meanwhile I am starting to think that the "no individual support" remark can be deleted Please bear in mind that I will be moving houses next weeks and I won't be replying as much as I used to do. Also the rev. 3.X (or V3 as Korben calls it) has to be finished. Let's call it V3 for clarity's sake.
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Last edited by jean-paul; 5th October 2012 at 06:52 AM.
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Old 5th October 2012, 08:48 AM   #593
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Quote:
Originally Posted by ByronInLawrence View Post
The problem was Q2, which is powered by U4. Though U4 may also have been a problem. A line of solder from at least one corner had climbed all the way up Q2 to the metal top. I replaced Q2 instead of just cleaning it up. I also cleaned up U3 and U4 with some wick. They look much better, and reversed C32. I'm listening to it right now, and I haven't even put C8 or C19 back yet. Sounds great as-is. I can't wait until I put it in a case and give it a better power supply. I'm currently using a Velleman kit.

Thank you everyone for your help. The second one, and V3 should go much more easily.
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ByronInLawrence, nice to read your V2.6 is working fine now.
As mentionned by Jean Paul, replace the suspected caps...
Hope you're enjoying the sound
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Old 5th October 2012, 10:05 AM   #594
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Hi,

I was wondering if WM8804 + ES9023 be able to decode HDCD over SPDIF?

If I could get the output of HDCD over SPDIF and send it to this DAC using coaxial cable, is ES9023 be able to decode?

Tks.


Regards,
Tat
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Old 5th October 2012, 12:33 PM   #595
syklab is offline syklab  Hong Kong
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Quote:
Originally Posted by chungtat View Post
Hi,

I was wondering if WM8804 + ES9023 be able to decode HDCD over SPDIF?

If I could get the output of HDCD over SPDIF and send it to this DAC using coaxial cable, is ES9023 be able to decode?

Tks.


Regards,
Tat
Hi Tat,
I have been playing HDCD from my oppo83se via s/Pdif and decode by Subbu DAC without any problem, the oppo s/Pdif outputs in LPCM.
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Old 6th October 2012, 03:57 AM   #596
grufti is offline grufti  United States
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Beautiful music from the first instant on. Chapeau, JP & Subbu!

Colors, depth, flow, reverb trails - both natural and machine made, detail, but not in a bad distracting way. Great human voices even soprano and choral with sheen, not edge. Power, drive and punch too, when it's there in the recording. Lovely, thank you. Crazy for the money.

Last edited by grufti; 6th October 2012 at 03:59 AM. Reason: forgot something
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Old 6th October 2012, 04:35 AM   #597
grufti is offline grufti  United States
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I tried to add these comments to my earlier message, but it was too late to make more changes.

Modifications from the latest official build
I made all of these changes only because I didn't have the "official" parts handy any more when I was building. No listening or picking involved.
WIMA 6.8nF/63V caps at C14/C15 - Nichicon 100uF/25V UKW1E101MED cap at C10B - Vishay Sprague 4.7uF/25V aluminum organic cap 94SC475X0025CBP at C32 - good old Murata 1.0uF/50V X7R monolithic ceramic cap at C8. This last one was originally in the BOM before the tantaulum cap won out.

Listening Environment
Source - many
Power Supply - Texas Instruments TPS7A4700EVM-094 Evaluation Module. This thing is a great little power supply at a very extremely reasonable price.
Volume control – Funk Tonstudiotechnik Headphone Amp module. Some assembly required, but still amazing value for the money.
Speakers – Genelec studio monitors. A habit that is hard to break.
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Old 6th October 2012, 03:52 PM   #598
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Hi grufti

Thank you for your report and comments

Reminder : Subbu's DAC V3 GB will be closed the 18th of October
Link : ES9023 / WM8804 S/PDIF "Subbu DAC V3" GB Interest
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Old 6th October 2012, 08:10 PM   #599
grufti is offline grufti  United States
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And of course, thank you Phil/korben69. It sure helped me to have your group buy parts available. Little bags with everything in it are much easier to work with than my very messy parts storage.
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Old 7th October 2012, 03:07 PM   #600
syklab is offline syklab  Hong Kong
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Hi,
Worked on my second board with only the DAC part being filled and input from the Amanero USB to I2S interface. I use ADP151 3.3V for U4 and left the X7R ceramic cap there as per datasheet recommended. Made one mistake when building this module, an open connection was found on U3 pin 2 which cause the pin 5 ouput voltage dropped to half. Everything is working fine now, sound is smooth and detail. I am going to try it my other USB to I2S CM6631 board.

I am thinking about using a small break-out box to re-route the I2S signal from R7/R8/R9 to a switch so that I can switch between USB and S/pdif.

Click the image to open in full size.

Click the image to open in full size.


By the way, I bought a can of flux cleaner, works great!

Last edited by syklab; 7th October 2012 at 03:18 PM.
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