What changed because of them
Barnkob's site, Kaizer Power Electronics, is where a lot of the hobby's working knowledge ended up written down: a DRSSTC design guide with worked numbers, the UD2.x phase-lead calculator, a mirror of Ward's UD1.3b and UD2.1b articles that this tree itself uses as a source, and a long list of featured coils. He also administers highvoltageforum.net.
His own coils show the boards in use rather than new ones. Kaizer DRSSTC IV in 2015 runs UD2.1b rebuilt as a single-sided board with no SMD parts, with reinforced 24 V traces and heat-sinked MOSFETs so it could hold the long on-times a QCW-style ramp needs. Kaizer DRSSTC VII in 2026 runs Daniel Marks' UD2.9 unmodified, sized straight out of his own guide's calculators, which he calls his ten-minute design. That a 2018 board is still being built on in 2026 is the point.
With Finn Hammer he built the large dual-DRSSTC system that opened at Denmark's Energimuseet in April 2025.
Their boards
Kaizer DRSSTC IV 
Kaizer DRSSTC VII
Builds and boards on the tree
- UD2.1b (mirror and documentation) · 2009 to 2012
- Kaizer DRSSTC IV · 2015
- Kaizer DRSSTC VII · Feb 2026
Sources
Written from what Mads Barnkob published, by one person, so it can be wrong in places. The page is meant to become editable, wiki-style, by profiles above a trust level. Until then, corrections go to the forum, and anything Mads Barnkob asks to change or remove is changed the same day.