Wx-dc12003 Schematic Guide
Because these modules are produced by various generic manufacturers, official schematics are rare. However, community reverse-engineering efforts on All About Circuits reveal a typical "buck-style" switching regulator layout: Input Stage:
: Detailed discussions and "lore" regarding its transformer winding and circuit board traces can be found on the All About Circuits forums . Kicad library for WX-DC12003 component · GitHub wx-dc12003 schematic
"But on the board?" Kael asked.