Revision revised again (probably won't be the last time, either)!
dave_ suggested an alternate fix in the 'scope images' thread (post #50, in case the pagenumber thing breaks the link for you). Instead of adding a second capacitor in parallel with the diode (which does work acceptably well), just relocate the one original cap from its original spot between the diode output and ground, to just plain between B+ and ground.
This is the extra-cap version:
Gives waveforms that look like this:
Acceptable, and it makes the driver reliable with the gate resistor deleted. But requires an extra capacitor.
dave_'s suggestion:
Gives you this:
Waveforms look better, needs fewer parts, and works just as well.
The capacitor can go anywhere on the board where it can connect between B+ and ground. There are many options on top or bottom of the board that will give the same connections. On the topside, there's a single ground via right beside the four B+ vias at the LED+ wire pad, if you'd prefer that it not be on the spring side of the board.
A larger value capacitor will flatten the oscillation more than shown above, but this works well enough and the part is the same as what comes on the Nanjg boards, for those who are using that as a source instead of buying bare parts in bulk. For those wanting to get more involved, you can change to a larger value cap if you wish. Experimentation required, and probably needs to be verified with your own scope images if you want to try something different.
ANOTHER SET of shared carts - same components as before, just with 1 cap per driver instead of 2:
shared cart- BLF-SRKDD | Digi-Key
shared cart- BLF-17DD & BLF-20DD | Digi-Key
shared cart- BLF-15DD | Digi-Key