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Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
just to try it out you could take a small electric motor and atach a balenced weel with skrews in it. then mount some skrews that are adjustible from the out side. It is about 1 millimeter per 1kv and you can easaly adjust RPM with motor voltage
Registered Member #316
Joined: Mon Mar 13 2006, 01:30PM
Location: Marietta, GA
Posts: 212
The problem is that most small electric motors have at least 1mm of slop on the shaft. Maybe if you could get some kind of precision motor for high-end electronics or something?
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
The 'problem' with low voltage repetetive spark gaps is the very small airgap is hard to quench, a little bit of surface degradation leads to power arcing. This depends upon current density I believe, so low voltage airgaps are also limited to low currents, so a high voltage/power/speed IGBT is probably better and a lot more efficient as i believe the voltage dropped across an airgap is >100V (work functions etc)
Registered Member #87
Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191
I've got some pure (non-doped) tungsten rod on the way, as well as my 2 942C for the tank cap, so results will be soon. TIG electrodes come doped with thorium to some extent, and some pre-ionization would help the gap tuning a bit. I might try that, I'll check some prices at my hardwares store. Would there be a way to dope the electrode myself? I'd figure some thorium nitrate solution to plate the tungsten a bit, but then its directly exposed to the arc, which could put it in the air. Would putting a bit of americium under the gap help much? Such as a dot from a smoke detector? They're suposed to ionize the air for the detector, but would it be powerful enogh for the gap in close proximety?
Registered Member #87
Joined: Thu Feb 09 2006, 01:36PM
Location: San Jose
Posts: 191
Just received my capacitors, and with no tuning, no topload, and spark gap made of steel(terrible) I've got 1 inch streamers! Best strike is 3 inches so far. The gap runs fine, took minimal efforts to tune. The real test will be with tungsten in a few days.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
If you go to digi-key they have little spark gaps for ESD purpasses. They come in flavors of 230v to 2500v some can take up to 20ka. Now I dont know how much average power they disapate but they are only 2-3 bucks ea. look under ESD or surge arrester or page 1302 of the moast current digi-key catalog
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1kv Spark Gap/Tesla Coil
