2 layers

Boards in 3 GitHub repositories, designed in KiCad, that use the BC559C by Diotec Semiconductor (General-purpose PNP bipolar junction transistor in TO-92 package with 2.54mm pitch, manufactured by several semiconductor companies.). See how each wires it, with its parts, size, README and files; the BC559C’s symbol, footprint and pinout are on its own page.