This is a public release of this design, created in KiCad. This board will plug on top of a Pi Zero and provide 3 SD cards (1x SDIO, 2x SPI) and an audio output DAC with headphone driver. This was originally designed for a prototype Audio player / streaming setup. This is a cutdown version omitting some power and misc components that are no longer required.
The board could be re-routed to be smaller, however I feel releasing the tested version is a better idea.
All design files are released to my GitHub account..
To setup the unit, the sd cards can be mounted as mentioned previously on my blog and the audio output device can use the HiFiBerry DAC Pro driver system. (They are a really good company, and I would support them if they provided a DAC with headphone drive in a small footprint).