2 layers61.2 × 61.2 mm

OpenBCI Wifi Shield
nestorufpe/OpentDCS-Hardware
All design files made with KiCad PCB design software. http://kicad-pcb.org/
35 parts1
Boards in 2 GitHub repositories, designed in KiCad, that use the REF200AU by Texas Instruments (-25℃~+85℃ 100uA 2.5V~40V Current Source ±0.25% SOIC-8 Current Source / Constant Current Source ROHS). See how each wires it, with its parts, size, README and files; the REF200AU’s symbol, footprint and pinout are on its own page.

nestorufpe/OpentDCS-Hardware
All design files made with KiCad PCB design software. http://kicad-pcb.org/

electricalhog/Discrete_Opamp
Off-the-shelve based FET input opamp designed in ECE5204 and brought to PCB