4 layers

IONPAK2
m-labs/ionpak
A modern, low-cost universal controller for hot-cathode ionization vacuum gauges. (WIP)
259 parts23
Boards in 2 GitHub repositories, designed in KiCad, that use the FAN3100CSX by onsemi (-40℃~+125℃ 1 13ns 200uA 3A 3A 4.5V~18V 9ns Low Side MOSFET Under Voltage Protection SOT-23-5 Gate Drivers ROHS). See how each wires it, with its parts, size, README and files; the FAN3100CSX’s symbol, footprint and pinout are on its own page.