I took off the gnarly duct toroid and installed a top capacity that I had lying around from the Van De Graaff project days. I don't know why it didn't occur to me before.
It lowered the frequency to a bit under 800 kHz, which is good, because I listen to Coast-to-Coast with George Noory on 820 kHz late at night, and the SSTC was jamming his signal before.
Also I get a bit higher voltage in the staccato or disruptive discharge mode, since the capacity is larger and much smoother.
Running IRFP252 mosfets in this vid.
I just built another x-bridge section and tested it with IRFP250 mosfets. Some very nice bangs! I can't even find all the pieces. But at least the landlord didn't call the cops.
the ducting tops always remind me of the robot from the tv series lost in space.
question: are the two hub caps electricly seperate? or do they touch? i presume the latter, its just that everyone calls them capacitors..
thanks, another fab flame !!
harpbloke 2 years ago
Yes, they are touching. And yes, it is a capacitor. The hubcaps or toroid or sphere function as a large smooth surface for charge to accumulate. The other plate of the capacitor may be considered to be the Earth. The hubcaps here have a capacitance of a few tens of picoFarads, which may not sound like much, but at a few hundred kilovolts it represents a lot of energy storage. Combined with the low inductance of the air-core resonator, it makes a significant difference in the resonant frequency.
TinselKoala 2 years ago
Man you sure know how to play...LOL...
Brilliant display.
Can101276 2 years ago
Thanks! Since yesterday I've blown another 4 IRFP250 mosfets, and 8 1n4744 Zeners, and a 2n7000 minimosfet. It's only about 18 dollars worth of parts; I probably could have consumed that much in beers and pizza, watching hockey on TV.
TinselKoala 2 years ago
so this is like A.A.
;)
crob227 2 years ago
Sort of. Except in these rooms, I'm all by myself, which is how I like it.
(Oh, and the coffee's a lot better.)
TinselKoala 2 years ago