fredbox wrote:I believe I may have found the schematic for the black pill. If so it can be added to the wiki. My boards are on order, so I can't verify that this is the right drawing. The 1.5k USB resistor is shown on the schematic as R7. Schematic is here.
Seems to be the correct schematic. There is a diode between USB power and the regulator, but no VIN pin. Any idea why? It also seems to be missing the 22 ohm series resistors on USB D+ and D-.
Also, unlike the Maple Mini there is a 10 M ohm resistor in parallel with the crystal.