4 layers68.3 × 25.4 mm

Flutter ARM R5 Basic
flutterwireless/kicad_conversion
converting the Flutter main boards to KiCAD
288 parts
Boards in 1 GitHub repository, designed in KiCad, that use the M20 by LGE (-55℃~+125℃ 1A 2V@1A 2kV 30A 5uA@2kV Independent SMA(DO-214AC) Diodes - General Purpose ROHS). See how each wires it, with its parts, size, README and files; the M20’s symbol, footprint and pinout are on its own page.

flutterwireless/kicad_conversion
converting the Flutter main boards to KiCAD