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Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Well, it was time for an upgrade. I started working on this coil again a few months ago. Adding a topload, readjusting the VCO range, upgrading to a fullbridge, making a new GDT, testing, building a box, etc. Long story short, the new coil worked long enough to get about 5 streamer pictures throughout the building phase. NOT because I can't put a SSTC together without blowing mosfets (a GDT wire did come loose, but only cost half of the full bridge) but because of flashovers. Apparently from primary to secondary, high current arcs do noticeable damage on thin magnet wire... That coil was hand-wound and the only I have of it's size.....
As a note of warning to others, use varnish!!!! I didn't, and as though this isn't punishment enough, I had to rewind half the coil before I started the upgrade due to the former changing size and wires criss-crossing. Words can probably describe how I feel, but none I can think of.
Registered Member #56
Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445
Yeah, I have burned up a few secondaries about the size due to flashovers. Varnish doesn't help, but putting a flat piece of plexiglass with a hole in the middle for the secondary on top of the primary is supposed to help (although it seems like that would only help for strikes from the top of the coil, i believe that it is supposed to change the electric field for the better).
Other than that just raise the primary or use a wider diameter primary (and probably add turns to keep the same load in your bridge).
Glad to see that you got it working so far! That coil is turning out really nicely.
Also, for testing that secondary is 100% workable, just unwind the charred turns, solder the remaining wire together, and wrap the bottom of the coil in electrical tape. It looks ugly, but works great
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Thanks Peter.
I've completed the coil! I tried 5 different primary configs before I found that just lumping all of the turns at the bottom works best. The secondary doesn't need to be lifted at all, and no arc-overs have occurred yet. I'm not sure if it's pushing as much power as I've had it at while maxed, but it runs without problems now.
Youtube video: Take that half-wave rectified without a topload!
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Uzzors' First SSTC
That coil was hand-wound and the only I have of it's size.....
