2 layers82.8 × 25.4 mm

Boards in 1 GitHub repository, designed in KiCad, that use the QSD124 by onsemi (-40℃~+100℃ 0.4V@0.5mA 100mW 100nA 12° 30V 880nm NPN 插件 Phototransistors ROHS). See how each wires it, with its parts, size, README and files; the QSD124’s symbol, footprint and pinout are on its own page.
