160mm DRSSTC II project | Questions

[Late]

Adjustable coupling secondaries are very useful. I usually build a geometry that gives high coupling, then raise the second secondary with various height spacers to lower the coupling. Maximum coupling without racing sparks is dependent on coil parameters. Make sure the inner turn of your primary isn't too close to your secondary and you should be fine.

Your bus design is very low inductance, but may be prone to arcing over, depending on how you design it. Running at 565Vbus, you have more headroom for high inductance bus design than at 850V. If I were you, I'd keep at least 5-6mm between + and - so it won't arc over even if you get big voltage spikes or conductive dust blown around.

The 2mm was chosen bc i have some 2mm self-made fiberglass material on hand. Ill just glue together 2 layers to get 4mm and that should be sufficient distance between the plates.

And talking about the coupling ill check how close it is to secondary. I have a feeling it may be bit too close in my current plan.

[Benjamin Lockhart]

I used 1mm fr4 fiberglass for my new double bridge but I made sure there was at least 6mm sticking past all the edges. I believe the dielectric strength of thinner material is just fine.
My DRSSTC3 is also done this way and I've had no problems with it.