Hi,

I've started some experimenting too. Far from finished in this category, but boy, are things strange.

I started with making a trifilair coil with 450 turns (0.511mm diameter). Made the oscillating part first to see what it would do. Unfortunately my transistor became too hot, but i was able to switch the circuit on for about 10 secs.

On the output i connected a rectifier bridge and hooked up a cap 470uf/385V. It would charge slowly and i did several tests (only 10secs.).

Strange is that the cap used, would, for days, charge itself, when not connected. after a couple of days it stopped.
So i discharged the Capacitor and a day later it would hold 10Volts! measured with a DVM. Weird.

In the meantime i replaced the transistor (forgot type) with a 2n3055. This one stays cool but charges the capacitor very strongly (I do not have yet a circuit ready with the 555 for dumping the charge!) In a couple of seconds the C is around 250V.

wild and weird. Hope to have it all running soon. Have about 4 dead gel-batteries waiting in the Emergency-Room ;-)