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12th September 2012, 02:14 PM
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#511 |
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diyAudio Member
Join Date: Nov 2006
Location: Lyon
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Cosmetics added to Spreadsheet :
https://docs.google.com/spreadsheet/...yd0NadlE#gid=0 More to com with links about PSU and pricing. I'll organize Parts GB for EU  (DAC + PSU parts)Phil Last edited by korben69; 12th September 2012 at 02:26 PM. |
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13th September 2012, 08:23 PM
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#512 |
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diyAudio Member
Join Date: Nov 2006
Location: Lyon
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15th September 2012, 09:25 AM
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#513 |
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diyAudio Member
Join Date: Aug 2010
Location: Athens
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So i completed assembly, connected the psu and i get total silence.
I examined the board and found a tiny strand of copper (i guess from the cable i used to connect the psu and dac) connecting pin 9 pin10 of wm8804 and c3. I removed it but still silence. Did i fry the IC? |
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15th September 2012, 11:00 AM
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#516 |
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diyAudio Moderator Emeritus
Join Date: Sep 2002
Location: Germany
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Normal procedure while/after assembling: measure the voltages of the regs first and then solder chips... Use desoldering wick.braid to remove excessive solder. Clean the board. Then check for soldering shorts with a magnifying glass and continue...
Procedure when things are done differently and it does not work: check the PCB for shorts (between pins of ICs) with a magnifying glass and please measure voltages of regs and check if the XO gives pulses with a scope. You have a big chance that the WM8804 is fried but I keep my fingers crossed for you.
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It's only audio Last edited by jean-paul; 15th September 2012 at 11:05 AM. |
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15th September 2012, 11:28 AM
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#517 |
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diyAudio Member
Join Date: Jan 2011
Location: sitting down
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I had similar problem.
I gave the salas more current and it solved the issue. Also, I suggest that you clean the pcb. there seems to be a lot of residual flux. hope this helps. |
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15th September 2012, 11:33 AM
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#518 |
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diyAudio Moderator Emeritus
Join Date: Sep 2002
Location: Germany
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The hint we gave repeatedly long ago is to feed it 5 V DC 250 mA. I know the quality of Salas regs but I doubt if they make a significant difference here since the Subbu DAC has 4 onboard regs which do the work. They would make a difference if they would be small onboard versions (is that possible ?) but the PCB would be several times larger then. Small size and short tracks do matter in this design.
Thanks necplusultra, you are right about the flux. I see it so often that I stopped bothering
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It's only audio Last edited by jean-paul; 15th September 2012 at 11:39 AM. |
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15th September 2012, 12:25 PM
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#520 |
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diyAudio Member
Join Date: Nov 2006
Location: Lyon
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Skouliki
I'll post tmorrow in the evening a pic with voltages on my working DAC. I wrote "my" as the measures were taken from my built They could be close to yours. Last edited by korben69; 15th September 2012 at 12:48 PM. |
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