2 layers

Audio chain
moonbeam87/audio_chain
KiCad designed Audio Chain. Dual channel, switching input, Quad amp IC with possible bluetooth support and LED integration being added
26 parts
Boards in 1 GitHub repository, designed in KiCad, that use the LM2902AWYDT by STMicroelectronics (-15V~-1.5V、1.5V~15V -40℃~+125℃ 1.3MHz 2nA 300nA 30uV/℃ 375uA 3V~30V 4 400V/ms 40mA 40nV/√Hz@1kHz 7mV 80dB SO-14 Operational Amplifier ROHS). See how each wires it, with its parts, size, README and files; the LM2902AWYDT’s symbol, footprint and pinout are on its own page.

moonbeam87/audio_chain
KiCad designed Audio Chain. Dual channel, switching input, Quad amp IC with possible bluetooth support and LED integration being added