Re: DC tesla coil

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

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

> The main problem with the setup described at the scopeboy site is if you
> don't run the RSG fast enough, you end up with flaming, trailing arcs in the
> RSG because the charging reactor saturates and stops acting like a current
> limiter, and you have a direct short across your power supply - not good.
> The way to eliminate that problem is to add another set of RSG stationary
> electrodes spaced so when one set is lined up with the rotor electrodes, the
> other set is spaced half way between the rotor electrodes.  The RSG then is
> wired to resonant charge the capacitors through one set of gaps, then
> discharge the capacitor into the primary through the other set of
> electrodes.  Works wonderfully well, and you can run your RSG as slow as you
> want with no diode popping power arcs.  As a bonus, the charging reactor
> only needs to be around 0.2 Henry, easily achieved with 4 50 mH home made
> air core coils in series to withstand the voltage across it.

An schematic diagram, and pictures of an actual setup, would help. It
looks
quite strange to charge the primary capacitor through a RSG, since the
contacts would have to be kept for long periods (possible, with fixed
electrodes covering a wide angle). The transformer (NST?) would not like
to have its output current interrupted by an opening gap.
0.2 H is quite a lot of inductance for an air-core coil. It would be
quite bigger than the average secondary coil...

Antonio Carlos M. de Queiroz