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Registered Member #1521
Joined: Thu Jun 05 2008, 10:46AM
Location: Hungary
Posts: 128
With 18 cap, you can't really get any long sparks in a marx as half of the voltage appears on the small spark gaps, maybe about 2-3cm. I suggest a villard cascade topology instead, with 6 series MOC as a single capacitor.
Registered Member #1403
Joined: Tue Mar 18 2008, 06:05PM
Location: Denmark, Odense C
Posts: 1968
omegalabs wrote ...
With 18 cap, you can't really get any long sparks in a marx as half of the voltage appears on the small spark gaps, maybe about 2-3cm. I suggest a villard cascade topology instead, with 6 series MOC as a single capacitor.
18 caps charged to even just 6kV should give him a ~100kV marx, make two towers of reverse polarity so you have +50kV and -50kV striking against each other.
Registered Member #1521
Joined: Thu Jun 05 2008, 10:46AM
Location: Hungary
Posts: 128
Mads Barnkob wrote ...
omegalabs wrote ...
With 18 cap, you can't really get any long sparks in a marx as half of the voltage appears on the small spark gaps, maybe about 2-3cm. I suggest a villard cascade topology instead, with 6 series MOC as a single capacitor.
18 caps charged to even just 6kV should give him a ~100kV marx, make two towers of reverse polarity so you have +50kV and -50kV striking against each other.
They are rated only 3kVDC. I have a lot of MOC's (like 200), but several failed at 7kVDC when they were discarged rapidly. The other problem with the marx is that you immediately lose a lot of voltage in the small spark gaps.
Registered Member #54655
Joined: Thu Mar 19 2015, 05:56PM
Location: BC, Canada
Posts: 82
Well what do you guys think, should I build a marx or a cap bank for can crushing, ring launching, etc. I ordered 50 2.2n 6.3kv ceramic disc caps and some resistors to build a smaller marx generator a while ago before I thought of using MOC's so I think maybe a cap bank will be more fun ; ). Anyway I'm just looking for an opinion here.
Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I built a ring launcher and you're going to need at least 200J to get any real action from an aluminum disk ring, that equates to 10uF at 6.3 KVDC, you only have enough caps for 110nF, so your ring probably won't leave the launcher.
Registered Member #54655
Joined: Thu Mar 19 2015, 05:56PM
Location: BC, Canada
Posts: 82
I have a big 12000uF 450V electrolytic capacitor that I could use but I think it has to much inductance or something because at 70V the ring didn't even leave the launcher.
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Microwave oven capacitors for marx generator
