It didn’t take long (or at least as long as I thought it would) to finish the driver board. It has a D3a hybrid mu-follower with SiC cathode bias arrangement:
The board is mounted on top of this previous board.
I usually get a lot of emails asking for more details and pictures of the building process. Here you are for the ones who asked for this. Hopefully this inspires you to build or use some of the same layout/techniques I use:
Did an initial testing which was really successful. As I used a pair of hybrid mu-follower boards (a.k.a gyrators) which weren’t designed for 250V bias point, I could only dial 230V maximum. It was fine as did a lovely test of 150Vpp anyway.
The modular approach is very handy. The small PCBs I made for turrets finally paid off. I can connect the boards easily with 2mm banana plugs and remove and/or change things as needed.
Clearly the modular design works well. Nicely organized, easy to wire, and I suspect very easy to modify/troubleshoot as well. Very well done sir!
This is very much a case of a picture is worth 1000 words and prevents a hundred stupid questions from me, such as how you would mount the ferrite beads, your turret solution, etc. And I encourage more along these lines, time permitting. Thanks!