The Audio Injector Octo sound card for the Raspberry Pi - RCA breakouts. Find more information at : http://audioinjector.net
These KiCad (http://kicad-pcb.org/) files give both the schematic and PCB gerber layouts for the RCA breakouts for the Audio Injector Octo sound card.
These single ended breakout boards are derived from the manufacturer's data sheet specifications for single ended breakouts of the codec used in the Octo sound card.
Matt Flax flatmax.com