DIY: testing the 2 PSUs
more progress; with a hidden 3.3v lm1117 underneath the board, soldered to its own isolated heatsink plane (which, btw, is NOT ground. harumph!)
the left side is at 5v and the right side will be at logic 3.3v. each has its own ground and its own B+ supply.
the top led is really red, but was too bright for the camera to capture well. green is for 5v power and orange is on the arduino pin13 to show activity.