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Registered Member #561
Joined: Sat Mar 03 2007, 02:46AM
Location: Adelaide Australia
Posts: 230
It's been a while since I've posted.
I'd be worried about the thin wire between your caps, primary and spark cap. The spark gap too would be some concern to me, it's a bit unusual...
The capacitors are also troubling. Have you got a part number for them? I tried Googling from what I could see in the pictures but couldn't find them. What is their total rated voltage?
Well, right off the bat I can see you've got thin gauge wire for all the interconnects. Wire is very resistive at RF frequencies due to skin depth and stray inductance. Other than that you didn't mention your grounding setup, and the ground system is literally half of the tesla coil. A low impedance RF ground will greatly enhance performance of any TC.
Registered Member #531
Joined: Sat Feb 17 2007, 10:51AM
Location: Burlington, Vermont
Posts: 125
Patric,
I would guess that much of the problem is due to your spark gap not quenching properly. As an experiment, try directing a stream of high speed air into the gap and noting any change in output discharge length. I think you may see a significant improvement in performance.
There is much info elsewhere on the forum regarding proper spark gap design.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
Patric, please upload a schematic of how you connected your complete circuit, we have no chance to help you with so few details.
Tell us all in detail that you have tried, all details of your setup and we will all be able to give you a proper range of possible problems and solutions.
How exactly did you connect those MOTs? From the pictures I can see that you have the primaries in series, so you have all the secondaries in series to get 5kV? How about the phasing of the transformers?
You primary coil is somewhat... artistic looking, get in bent in a proper shape with some simple holders from whatever household item made of plastic. From all I can see it could be short circuiting somewhere.
Registered Member #48007
Joined: Wed Jun 18 2014, 01:00PM
Location: Prilep, Republic of Macedonia
Posts: 33
Maybe two MOT's instead of 4, and use one with a shorted secondary to ballast them both. So you will need three MOT's and the power demand would be reasonable... At that power levels, a static spark gap is not suitable. Also, why did you use MKP caps in a SGTC???
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Very dissapointed in MOT Tesla coil.
