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Resonant MOT arcs

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Ken M.

Wed Mar 26 2008, 09:27PM

Registered Member #618 Joined: Sat Mar 31 2007, 04:15AM
Location: Us-Great Lakes
Posts: 628

Very nice, but if you get any more powerful MOts your gonna be needing a crane or several individual trips to set up the system in different areas, but yes This is making me very interedted in entertaining the idea of making one of these and just for "Flaming line" fun everynow and then.

Dr. Dark Current

Tue Apr 08 2008, 07:14PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

[Edit- I didnt realise I have posted this already, sorry]

But someone here did resonant arcs with a NST!

Kizmo

Thu Apr 17 2008, 09:02PM

Registered Member #599 Joined: Thu Mar 22 2007, 07:40PM
Location: Northern Finland, Rovaniemi
Posts: 624

Some resonant stuff with very crappy camera. But only 6kV

Kristian

Wed Apr 30 2008, 11:34PM

Registered Member #611 Joined: Wed Mar 28 2007, 11:40PM
Location: Hudsonville, Michigan
Posts: 79

OK I had a go at this. Posted a video. Here it is

These are not current limited. Each mot is on its own 20A circuit. I put the caps in a bucket just in case of a catastrophic failure.

I will be trying 4 mots and 4 strings of 4 caps this weekend. I'll post a vid next week.

Spedy

Sun May 04 2008, 01:30AM

Registered Member #964 Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134

I hope this thread isn;t "dead" and me posting here is against the rules...

All I can say is "Wow." Makes me feel like doing the work required to ram 10 feet of copper pipe into the ground..

(arg! I hope that's not a requirement for grounding!)

Now then, all I need to do is inconspicuously break my microwave, then I'm 1/3 of the way there... *evil genius laugh*

Backyard Skunkworks

Sun May 04 2008, 03:03AM

Registered Member #1262 Joined: Fri Jan 25 2008, 05:22AM
Location: Maryland, USA
Posts: 451

Spedy wrote ...

Now then, all I need to do is inconspicuously break my microwave, then I'm 1/3 of the way there... *evil genius laugh*

"I swear the directions said wrap in aluminum foil and drive a spike through the rear housing..."

I donno if anyone ever thought of this but... It might be possible to extract an MOT without killing the microwave.

The one MOT I got came from a trashed microwave I found curbside the night before garbage pickup. The door was missing (the obvious reason it was discarded) however getting the MOT out was not a very destructive process, it just involved un-bolting it and pulling a couple connectors. Maybe you could "borrow" an MOT out of a working microwave?

BTW amazing arcs! If I had more MOTs and the risk of electrocution wasn't so high I would have to try!

Dragon64

Sun May 04 2008, 05:50AM

Registered Member #1438 Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218

Wow, Plasmaddict. Those are some impressive power arc's! I also thought that the tub was full of water O_O. When I was handling my MOT to try and set up the resonant curcuit, I forgot how much they weighed and almost dropped it.

Spedy

Sun May 04 2008, 05:29PM

Registered Member #964 Joined: Wed Aug 22 2007, 12:39AM
Location: Stockton, CA
Posts: 134

Yah, large blocks of metal and plastic tend to be heavy =P

I wonder when the next garbage pick-up is... last time I saw an old water boiler in the street..

EDIT: Dumb question. For one MOT, would I use 2 MOC's in series or in parallel? I only have 2 MOC's so I was wondering..
Also, would a smaller MOT w/ shorted secondary on the the primary side work as ballast?

Mads Barnkob

Thu Jun 05 2008, 09:01AM

Registered Member #1403 Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968

Spedy wrote ...

Yah, large blocks of metal and plastic tend to be heavy =P

I wonder when the next garbage pick-up is... last time I saw an old water boiler in the street..

EDIT: Dumb question. For one MOT, would I use 2 MOC's in series or in parallel? I only have 2 MOC's so I was wondering..
Also, would a smaller MOT w/ shorted secondary on the the primary side work as ballast?

I did one MOT with 2 parallel MOCs in series with the MOT, no ballast and it worked like a charm. It can deliver about 20cm arcs at the top of the jacobs ladder I build for it.

Calculating the resonating frequency is like a standard LC circuit? As I am currently not home I cant measure the inductance of the secondary and give it a go.

Dr. Dark Current

Fri Jun 06 2008, 06:41PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

MadsKaizer wrote ...

Calculating the resonating frequency is like a standard LC circuit? As I am currently not home I cant measure the inductance of the secondary and give it a go.

Resonant frequency is determined by capacitance and leakage inductance of your MOT. Short the MOT primary and then measure the secondary inductance.

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