[COOKIESnPIE]

Post deleted by user.
 
 

 

[Avro_Arrow]

1. Yes
2. Rotate PCM 90 degrees and you should be able to untwist your I2S and keep them all on the top layer.
3. For the most part, yes.
4. What you have done is correct.
5. I'm not sure what the question is.
 
Regular Via's go in one side and out the other.
Blind Via's go in one side and don't come out the other.
Buried Via's are completely internal to the board and don't come out either side.
Blind and buried Via's are only applicable to boards with more than two layers.

 

[Avro_Arrow]

Here is an example of a USB input filter.
You wont be using the D+ and D- so you can ignore that part of it.
 


And how it could be routed:
 

 

[Avro_Arrow]

And here is an example of how you can use your damping resistors and
chip orientation to keep your I2S lines tangle free:

 

 

[COOKIESnPIE]

Post deleted by user.
 
 

 

[COOKIESnPIE]

Post deleted by user.
 
 

 

[Avro_Arrow]

 
 
The problem here with I2S damping is that I have no idea what resistor values will work best. I've read up on the topic here, but as stated earlier I don't know the output and input impendances of the WM8804 and PCM5102A. Other designs I've looked at have used anything from 22 to 100 ohms, as the values probably will vary based on reciever and DAC. But I have no way of calculating it without a scope - or is there a way?

 
Like you said, without knowing the values, any resistor is just a guess.
Swapping values and checking the waveform on a scope would get the
best results. The values may be different for each line as well.
 
You could try 22, 49.9 and 100 and see if there is any audible difference.
Resistors are cheap.
 

 

[COOKIESnPIE]

Post deleted by user.
 
 

 

[MisterX]

You could always check the WM8804 and PCM5102A evaluation module schematics for hints.

 

[Avro_Arrow]

Here is a schematic you can use for powering your DAC.
 


You can use it with a 9 volt AC wall wort...that way you avoid having to work with line voltage.
 
I used this set-up in my project here.

 

[COOKIESnPIE]

Post deleted by user.
 
 

 

[tuck1s]

Hi, this looks really interesting.  I have an application for WM8804 standalone (without DAC) - receiving digital audio stream, recovering clock for input to a single board computer.  Are you making PCBs yet?  I would be interested in buying one.

 

[COOKIESnPIE]

Post deleted by user.