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Registered Member #1739
Joined: Fri Oct 03 2008, 10:05AM
Location: Moscow, Russia
Posts: 261
Well, I was messing around my coil on lower (<35% working according to graduated percent meter where 100% is set to 240vac) voltages tonight (she's kinda loud) and just for fun put on an airduct toroid I had in my scrappile. Atm she's an antenna-driven H-bridge system with 30a fets driven directly via optos, secondary is 15x35cm if I recall it right, with a 20cm wide toroid made of an 8cm airduct. Primary is 8 turns on a flower pot (had a blow during an overload attempt with 7 turns, according to calculations that dropped 30% of inductance however), nearly 17-20 cone 15cm high. With all that it all worked well, running 80bps with a 1/4 d/c without any blows, giving off up to 60cm sparks.
But on the tests I ran a few minutes ago it all gone weird. Like always, running at 35% I got like 5cm discharge (the length vs voltage curve is always weird on this one, the growth is rapid on the higher voltages, around 15cm gain from 220 to 240vac), the period measured with a scope standing at the other corner of the room is 5us. But - with two toroids (the other is from alike airduct, but 30cm outer diameter) I gained twice as long spark, the scope trace displayed a significant voltage increase as well while the period experienced a rise to 5.6us. Now a question itself - is there a chance this will remain working on the default operating voltage? According to my calculations, the spark-gained frequency drop is way higher then the one gained by the new toroid, and the reason of such a good effect is not related with the "frequency vs inductance" effect - so the present primary looks like the one to suite the double-toroid design well as the fatal 30% are not going to be reached for sure. What do you guys think - should I try it out this morning or the idea is doomed so I need to get some 50+ A fets first?
[add]HAHA Double the gun - double the fun! (c)
It works - constant 60-70cm breakout, dunno if it can do more - I feared she'd strike upon the variac or her own antenna so aimed it away where the spark always hits the shelf poles and the bookshelf itself (bet one ruined my radio, I never listen to it anyway so don't give a hell :P) Small threadlike sparks form up on the primary, the main spark tends to hit the center of the primary from time to time as well.
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SSTC toroid upgrade - up for the skys or down to the grave?
