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Registered Member #160
Joined: Mon Feb 13 2006, 02:07AM
Location: Melbourne, Australia
Posts: 938
Herr Zapp wrote ...
This is supposedly because as HV charge accumulates on the toroid, it creates a cloud of ionized air all around the toroid, which increases its effective size, which increases its efffective capacitance, which lowers the actual resonant frequency of the secondary.
This is by far the best reason I've heard of why the measured resonance and the working resonance don't match. Most people just say that spark loading lowers the resonant frequency.
Registered Member #952
Joined: Mon Aug 13 2007, 11:07AM
Location: Finland
Posts: 388
Firefox wrote ...
Could it be that the topload is too big and the capacitance prevents breakout at that power level?
Yeah! Why did no one think about that yet? The toroid is so round that it has no sharp points to break out. Maybe you should try to add a sharp breakout point (a screw or a nail for example) on the topload.
Registered Member #538
Joined: Sun Feb 18 2007, 08:33PM
Location: Finland
Posts: 181
Dr. 2N3055 wrote ...
Firefox wrote ...
Could it be that the topload is too big and the capacitance prevents breakout at that power level?
Yeah! Why did no one think about that yet? The toroid is so round that it has no sharp points to break out. Maybe you should try to add a sharp breakout point (a screw or a nail for example) on the topload.
12kV 30mA NST should be plenty of power, the coil is just tuned incorrectly.
Registered Member #1292
Joined: Wed Feb 06 2008, 04:09AM
Location: Mesa, AZ
Posts: 25
I've been busy with college starting back up in a few days, but I made an RQ gap and it increased the gap to the breakout point to 8 inches. The spark looks much brighter and wider, but the coil still won't arc into air. I'll try re-tuning now that I have a new gap and let you know how it works.
i would try with a small break out point and as for the RQ gap i used a slightly different version of it that i found worked heaps better than the original..
suck air through the gap with a good sized fan (not PC fans they suck pardon the pun) i used the side of a squirrel cage fan a large one and block the end, then cut slots in the sides that line up with the gaps in the electrodes so the air is sucked through the gaps nicely..
you will get a better charge of air through this way...
as for the output i had more from my 90mm secondary with a 12kv 30ma nst with bottle caps...
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Help! My coil almost works
