Here's the plan:
Designed the 12V power board with 5V and 3.3V outputs, voltage/polarity-labeled screw terminals, chamfered corners, and four M3 mounting ears. The buck stages use Diodes' reference topology. Use correctly polarized, regulated 12V DC; verify the generated switching layout and usable output-current/thermal limits before use.
Positioned the 12V input, 5V output, and 3.3V output left-to-right along the bottom edge, with custom voltage and polarity silkscreen labels. Connector designators are now simply J1, J2, and J3, separate from their functional labels.
Arranged the regulators, inductors, and capacitors into two matching power-stage groups above the existing connector row, giving every part a fixed position. Custom voltage/polarity labels and standard designators are preserved; review the generated buck-converter routing before fabrication.
Rotated J1–J3 by 180° so their wire-entry openings face outward, with a small inward adjustment to maintain board-edge clearance.
Moved J1–J3 to the top edge with wire entries facing outward, and shifted both power-stage groups and the title lower without changing the board size. Custom voltage/polarity labels, standard designators, and mounting holes are preserved; review the regenerated buck-converter routing before fabrication.
Added a clear pin legend beneath each connector: pin 1 is +12V IN on J1, +5V OUT on J2, and +3.3V OUT on J3; pin 2 is GND on all three.
Replaced the verbose legends with short, rotated labels aligned with each connector pin: 12V IN, 5V OUT, 3.3V OUT, and GND.
Updated the silkscreen title to “12V DC TO 5V/3.3V”.