2 layers21 × 19 mm

Detector
aydin-ege/Non-Contact-AC-Voltage-Tester
A low cost mains voltage tester with small footprint and adjustable sensitivity, with a 2 sided PCB designed on KiCAD with mostly SMD components
17 parts1MIT
Printed circuit boards designed in KiCad and published on GitHub, each with its parts, layers and size, its README and its files; open any of them in PCBKit.

aydin-ege/Non-Contact-AC-Voltage-Tester
A low cost mains voltage tester with small footprint and adjustable sensitivity, with a 2 sided PCB designed on KiCAD with mostly SMD components

aydin-ege/High-Voltage-Generator
An improved ZVS circuit on PCB with a safety oriented design that generates 400V from low voltage DC for the purposes of operating a Geiger-Müller Tube