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Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
a while ago I obtained 50 of thease condenser products stick capacitors and I am going to try to build a marx out of them since I got the parts now. They have a rating of .032uf at 50Kv ea. I figure on some where around 40-50 stages. I plan to charge them to 40Kv with 2Mev max out if it doesn't fail. I'll probibly build a mazilli circuit to power it later. more pictures as its built.
has anybody tried this? I have built a cuple of 20 stage doorknob marxes like Steve wards with a 2.5ft spark but I am not shure what 2Mev will do or if the caps can take the shock. If it works properly I should be able to get a 7-8 ft spark. Secondaraly I might need a place to test it because the EMI could nock out electronics like satalite dishes phones ect. don't know, any coments welcome.
Registered Member #540
Joined: Mon Feb 19 2007, 07:49PM
Location: MIT
Posts: 969
You probably will have problems with coronal losses so you might want to construct some coronal rings to balance out the field? When you say 2Mev, do you mean 2MV? You might want to try a bipolar marx?
Registered Member #2372
Joined:
Location:
Posts: 62
pinhole cameras work really well for taking picture of arcs. you can just take the lens off of a camera and stick a pinhole in front of it and then open the shutter and fire the marx.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
thanks all, how can I take a picture of the arc since the pulse time is so short.
Do it in the dark with the shutter open, then close the shutter before you turn on the light.
If your camera is not capable you can depend on random luck and take pictures until you get a good one or you can make a circuit that triggers the device when the shutter of your camera is open.
Registered Member #195
Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
the charging resitors I am thinking of using is 5 standard 1w 820K carbon film. I have over a 1000. I am not shure how efective they will work. The other option is liquid resistors or inductors. The pictures show the resistors and G-10 for mounting and my doorknob marxes. In the doorknob marx I used 2 X 750k.
Registered Member #311
Joined: Sun Mar 12 2006, 08:28PM
Location:
Posts: 253
I found that carbon films tend to go open-circuit after a few pulses. You want solid carbon if at all possible, which are pretty indestructible. 5x820k in series will be too high for 32nf caps.
32nf per stage at that voltage will make an awesome bang, but will need a fairly powerful charging source, As a guide, my bipolar marx uses 2x 20x 2.2nf per stage, the psu is 4 large TV flybacks in parallel & takes about 5 secs to charge.
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2Mev marx
