Housekeeping update - 1.2.2 Version numbers updated to 1.2.2 for the schematic and PCB Components identified, datasheet and descriptions updated iBOM regenerated PCB plots regenerated PCB : - only thermal reliefs on PTH, not on SMD pads - couple GND islands taken care of - couple rationalisations on the 3v3 rails

Merge branch 'Alex-dev'

GND fill thermal reliefs Changed the GND plane fill to thermal relief to aid manufacture

PCB update Includes 12V switcher updates plus other tweaks and additional ground stitching

Updated opamp footprint

Updated 12V to 3V3 Simplified 12V to 3V3 switcher

Externalised the Iset resistor

Minor PCB changes

Comments @Alex-XNR Just confirmed with comments to educate me. I think the only point that remains open is the question of Rf and Ri ? I can't remember where I saw they were included and I can't see, to find anymore. For the higher resistance I/O I think I will try with a higher Iset resistor ? With my crappy simulator it seems to run.

Added simulation files LTspice simulation files for reference