Hi
This looks like great project and I’ve invested in as Seed board, I have little project that I would like to implement.
I’ve spent a day or so looking at the documentation and the forum posts but unless I’ve missed something actual data on the hardware pin functions is a bit lacking. I’ve inferred quite a lot from the schematics for other products but several things aren’t clear to me. To start with I’m simply interested in attaching an audio amplifier to the output but there seems to be no data as to the signal amplitude nor impedance. Do I understand correctly that a PCM3060 is used as an output CODEC? Is there a buffer amplifier? Is the output AC coupled?
I understand that you don’t want make the exact design Public Domain for good reasons but some data detailing the pin characteristics would be very useful. Sorry If I have missed some vital documentation, but I have spent some time on looking.