audioinjector schematic

[pex]

Hi,

for data logging [1] we put a pirtc (PCF8523) ontop of the audioinjector and broke our Raspberry. So we wonder if the audioinjector is changing the pinouts of the Raspberry Pi.
Is there a schematic of the audioinjector online?

Thanks a lot in advance,
pex

[1] for our project: https://github.com/m-r-s/hearingaid-prototype