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Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
I built these days another dual MOT for a friend (he needs it for a presentation or maibe to impress some other guys, who knows). I dont have the time to set a web page, but I made a quick movie presentation (sort of...) and some "action" movies.
The power source is just two MOTs in serie (4-4.5 kV output), inductive ballasted on the low voltage side. I still believe that it is the cheapest solution for the eastern Europe where the NSTs are still rare. They give enough power for a healthy streamer and if they are well ballasted they can get some more voltage input (from a variac) without saturation (just more voltage and lower current in the same power area). The gap is not set very wide (to mantain the breakrate at resonable high level), so the streamer is not the longest possible, but is still very good for a presentation. I wound a bit longer secondary to prevent the strikes to the strikerail, allowing the full lenght for the streamers. Because the low kV input the primary cap cost is very low.
Registered Member #229
Joined: Tue Feb 21 2006, 07:33PM
Location: Romania
Posts: 506
Thanx. The caps are cool, they are overrated at 4 x input voltage and 3 strings in parallel (12.5 nF per string) distribute the current very well). If you look at the presentation movie, you notice that I leaved an empty place for a possible one more ballast coil for more power. But I think that it is enough for a presentation coil.
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New dual MOT SGTC
