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Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Verdict is, I'll try leaving it as a helical and see how things go. I have kicked 7ft out of it in the past, but i figured my tuning was horrible because it flashed over so much from the topload to the primary, racing sparks (its hard to tell if that bolt hits the ground, from a peice of wiring that was poking out, or if it was on the secondary)
No visual burns though, shiny poly still.
I figured it was bad tuning. Then when i clicked on burst mode, it went to HELL and i HAD to turned it off! X_X
Could have been the secondary...or my wires.
In this video i tried burst mode at 1:50 but it really REALLY hated that...
Registered Member #2292
Joined: Fri Aug 14 2009, 05:33PM
Location: The Wild West AKA Arizona
Posts: 795
Oh my.... Please tell me that's not how you had your secondary wired to the toroid?!?!?! That wire is probably half your problem. Tuning is also not as big a deal as your issues with your coupling, resolve the coupling and that wire first and you will stop have problems with flashovers. Tuning comes second.
EDIT
I can see the spark coming off the tip of the wire in your photo and racing down the secondary...
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
Location:
Posts: 1039
Seeing I had to build it with low cost materials, i had to connect the copper rings and the conduit using thin copper wire that I just twisted around each ring maybe 10 time, and secondary wire just connects to it. I had no better ideas, other than just take that wire and shove it up :P
I tried a solid AL topload, not at full power but, sparks were 100% the same as my topload in terms of length to power. If anything my topload (a little bigger) had better kick.
Mind these pics are from the halfbridge days, taken like 5 months ago
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
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Posts: 1039
Is there a typical rule of thumb of how high you want your first secondary turn to be from the first (lower) primary turn? Or should I just make 5 woods blocks, 1/2" thick, 12" diameter, and stack one at a time, until the coil seems to perform best?
Registered Member #1643
Joined: Mon Aug 18 2008, 06:10PM
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Posts: 1039
Thanks for the tips. Sounds like something I'll have to do down at the lab where I have space to blast arcs big enough to flash over hehe. But i got things to do before then. Such as a better primary tap. Right now, I have a bent copper 1/4" hook, just resting on a tap. Rather sucky isnt it :D
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Medium size DRSSTC - Primary Flat or Helical
That wire is probably half your problem. Tuning is also not as big a deal as your issues with your coupling, resolve the coupling and that wire first and you will stop have problems with flashovers. Tuning comes second. 
