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"Subbu DAC V3 - ES9023/WM8804 SPDIF & Power Supply PCB" Group Buy

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#561
Let the party starting ...

Finished one power supply giving steady 4.98V

I like that smd pads are confortable size. Soldered one Wm8804 without problems.
 

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#566
Could someone please send me the bom, or just tell me what type of transformer to get, what are the needed specs. I didn't get the bom since I registered for the gb later than everybody else and I could check if my local shop has the right kind of transformer. The other parts i'll get from the parts gb 🙂
 
#569
I see on the schematic Q1,Q2 and Q3 (Q2 and Q3 seems paralleled). I believe this is an error and there is no Q3.
What is the secret of soldering Q2 as the case covers entire soldering pads and there is no acces with soldering iron ?
 
#570
atupi said:
I see on the schematic Q1,Q2 and Q3 (Q2 and Q3 seems paralleled). I believe this is an error and there is no Q3.
What is the secret of soldering Q2 as the case covers entire soldering pads and there is no acces with soldering iron ?
Click to expand...

they are difficult but do-able, at the very sides of the Q2 package you should see exposed contacts that run under the xo.

tin the pads and align the xo over them with flux and apply heat to one exposed contact by pressing the flat of the bit firmly against the side for a second or so. Check it has taken and the alignment and continue with the rest. Careful with overheating.

You can check continuity by C17 and L3 pads to the very side of the xo contacts - only two of the xo contact pads are used, is this correct?

Hope that's clear 🙂
 
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#571
Managed to finish first DAC. Soldered carefully, washed the pcb after finished soldering smd parts but sound is bad.
It sounds like a poor tuned FM station, my stomach tells me that is something related with spdif interface. Any idea, what to check ?

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.
 
#573
Some new findings: when spdif is not locked is complete silence, after spdif loks to source and sound coming also that strange pink noise appears also.
Spdif looks like it takes longer that experienced with other dacs to lock to source.
 
#574
"dry joints" on the WM8804 ? Looks like that on the picture, at least the left pin connected to the crystal. Or a overheated WM8804 ?

Did you measure both 3.3 V regs ? BTW use either thinner wires for the connections or use Molex KK.
 
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#575
All voltages are ok before and after installing L3,4,5,6
I have reflowed the Wm8804 pins as i had suspected the same dry joints.

As i have 3 dac kits so assemble i will start building a new one to see if i will experience same issues with this one.
 
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