UD2.7C rebuilt through-hole (easier to hand-solder, harder to source SMD for) with a pulse-skip jumper, in the DRSSTC-PCB-Pack under CC-BY-SA. Six weeks after UD3, and a different branch entirely.
Schematics and photos

schematic: UD2.9 Skip Pulse, drafted by Daniel Marks (KiCad, 28 Feb 2018)
Sources
- DRSSTC-PCB-Pack
- commongnd: the UD boards
- highvoltageforum.net: profdc9’s own release announcement: “this includes the UD2.9 skip pulse gerbers, as well as PCBs for interrupters and bridge boards” (14 May / 18 May / 1 Jun 2018)
This is the card from the driver tree, written from what the builder published. Send corrections through the forum.