It was a while since I posted an update on this project. It changed recently, when PCBWay company contacted me offering free set of PCBs for the yPod. It was an impulse I needed to move things a little bit forward with this project. My original design had some issues that required factory manufactured PCB to fix. For example due to differences in trances length I wasn't able to operate 4bit SDIO interface at full speed. Equalizing those traces required putting vias under microcontroller which is not easy (or nearly impossible) with homemade printed circuit boards. With boards from PCBWay it was an easy fix.

I also used that opportunity to slightly reduce size of the board and add FM radio module, connected to the input of DAC chip.

I uploaded gerber files and less than week later package arrived. PCB quality is great.

I was able to populate one of this board with most of elements. Unfortunately I wasn't able to get some of them due to current situation on semiconductor market. The most obvious solution would be to simply disassemble them from working prototype, but I really do not want to do this. Working device would be valuable as a reference while working with the next iteration. Moreover - PCB for yPod prototype is one of the best homemade PCBs I ever made. I do not want to destroy it by giving it thermal shock during hot air desoldering. And of course I'd like to photograph two completed boards together. :)

I will rather try to buy missing parts somwhere.