Small DRSSTCs

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "S&JY" <youngsters@xxxxxxxxxxxxxxx>

1) The list has been buzzing with the success of ever-larger and more
impressive DRSSTCs, with even larger ones on the drawing board.  But what
about the other end of the spectrum?  Some of us may wish to build much
smaller versions for tabletop fun and portability.  But as size goes down,
the secondary resonant frequency goes up, and can be in the 200-500 kHz
range.

Question - are IGBTs available that can work well at much higher Fs?
Current capacity & voltage rating need only be enough to produce leaders
measured in inches for tiny coils, to about 3 feet for larger desktop
models.  Any suggested manufacturers & products?  Any general design advise
for building small DRSSTCs?

2) Suppose one wanted to buiild a twin coil DRSSTC.  Does anyone see a
problem in using feedback from just one of the primaries or secondaries?  I
think all would be well for leaders jumping between the coils, but what if
one coil experiences a ground strike and the other one doesn't, etc?
Experts, any thoughts?

--Steve Y.