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Registered Member #3414
Joined: Sun Nov 14 2010, 05:05PM
Location: UK
Posts: 4245
Well, I found this supplier of flexible aluminium ducting. They stock several sizes, including 200mm and 300mm. I've not looked around for cheaper suppliers.
I won't be ordering any just yet, but this does seem to be the stuff to use to get a basic toroid shape.
EDIT: While the price, ex vat, of 3m x 200mm is just over £20, with delivery and vat this increases to just under £40, so maybe I'll keep looking.....
EDIT: Found a supplier on Ebay, almost half the price including postage.
I don't have very much to add seeing how you're going for a resonant charging system. My old Tesla Coil 2 which I built 10 years ago (has it been that long?) simply used 4 MOTs in series submerged in oil (8.5kVAC out) and a rotary gap. I recently fired it up earlier this year and it's still happily making 1.8m of spark or so, mostly limited by ceiling and old flakey ducted toroid at the moment.
and
Total apparent power from the wall as just about 4kVA. It used a 55x11cm secondary with a 51x12.7cm PVC ducted toroid wrapped with aluminium tape, with a flat primary and runs at just around 200kHz. Primary cap is 53nF. Right now my RSG is running at about 300bps so I'm sure there is a little bit more play and tuning I could do to optimize performance (e.g. maybe a sync rsg). Perhaps these dimensions may be useful for your project.
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Basic SGTC questions
