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Registered Member #1732
Joined: Thu Oct 02 2008, 02:34PM
Location: Huntsville, AL
Posts: 112
Kizmo wrote ...
Great job Philip! :)
Gotta love that enormous pile of MMC you got there. Thats the way to go! There is absolutely no way one can overheat mmc like that
How high bus voltages are you using?
Quite a "pile" of MMC caps it is. The MMC consists of seventy-five capacitors in total. When you're spending this much time and money on a coil, it's best not to fool around trying to just scrape by. Indeed, this MMC is nearly bullet-proof. At the maximum of 3kA the peak voltage that the MMC sees is just below the AC rating on the caps (granted, that is a 60Hz AC rating).
We usually run between 700V and 800V on the bus. The bus capacitors are only rated for 840VDC, so 800V is the limit.
Registered Member #3908
Joined: Tue May 24 2011, 09:40PM
Location: Gilbert, Arizona USA
Posts: 68
Hi Phillip! I believe you have set a new goal for others to achieve with your stunning work of art. Clearly in the same league of your MPTCC. And I imagine the doubler construction is just as meticulous. Maybe even including a smart auto-precharge circuit.
Congratulations! Hopefully your neighbors are friendly and supportive!
Registered Member #1732
Joined: Thu Oct 02 2008, 02:34PM
Location: Huntsville, AL
Posts: 112
We ran the coil tonight, and finally started pushing it. We managed to get 16' 4" out of it, and then we had to pack it all up. Looks like it could still do more.
Registered Member #146
Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055
Its pretty nice and all, but its really hard to see the lock-washers in the bridge exploded view... maybe you can work on that.
Just messing with you, of course. Obviously you did a superb job, and i know there is more to come!
Im very impressed with the spark length to toroid size ratio here. I wonder how much further it might be able to go?
Also noticing the 16 footers are much dimmer than the ground strikes. I do wonder how much the resistance of the brick post matters, or if its simply reaching the impedance of the arc that limits the discharge current, and hence brightness. Id have to think a bigger toroid might "fix" that.
Registered Member #5777
Joined: Tue Jul 17 2012, 03:34AM
Location: Moulton Al
Posts: 3
I wondered about the Streamers too, I was noticing that when it went to Jack Hammering on the Concrete that they instantly became fatter and brighter, but at almost near the same time any branches that were not to ground also seemed to increase in Luminosity I'd like to look at the video again frame by frame to see.
As for a bigger Toroid are you going to let Phillip borrow Gigantors?
Registered Member #1732
Joined: Thu Oct 02 2008, 02:34PM
Location: Huntsville, AL
Posts: 112
Mads Barnkob wrote ...
Could you please detail on how you made the foam core, smoothing, adding tape to be as smooth etc.
I didn't actually build the toroid. Cameron Prince did. As I recall he had the foam core made by a company, and then shipped to him. He then applied the tape strip by strip, and used some sort of roller to ensure that it was smooth.
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