Thanks Walter,
That's its biggest drawback I'd say - the information about it being scattered around several threads on the CNCZone, there are some links in that thread you posted that will take you to other threads about it. There's also some info in this Wiki
As you probably figured it's not a comercial drive, it was developed by a CNCZone member called Kreutz in effort to get a DIY drive for high(ish) voltage motors where the original UHU-circuit failed to deliver. Kits were made (and probably IS) available by Paul Harshman (tenmetalman) and Irfan Ulla, also on CNCZone at very reasonable prices.
Being involved since the early stages of the HP-UHU's life I know it pretty well so if you have specific questions regarding it fire away and I'll do my best to answer them. Perhaps it's better to keep it separate from this thread though.
Thanks!
/Henrik.
EDIT: Thank you for embedding the video by the way!
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