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Some progress on my MARX

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LAN_403

Dr. Shark

Mon Aug 14 2006, 06:40PM

Registered Member #75 Joined: Thu Feb 09 2006, 09:30AM
Location: Montana, USA
Posts: 711

Hey guys,
just so you don't think I have given up playing with high voltage alltogether, I got a few picures for you to laugh at:

Stress testing door-knobs

yup, thats the output of my 100kV Cascade arcing across it. The gap is set at something like 7cm (3"), but the 30kV doorknob stood up fine. Closeup:

The results (not the voltage rating, but rather all the surface tracking across the caps) persuaded me to double up on caps in the prototype marx:

This was probably a good idea, but not sufficient, since it now arcs over all over the place:

Oh, btw, don't be fooled by the rather short sparks: The gaps are only set at only 2cm, but because of the smoothness of the spheres, they probably only arc over at 50kV or so.

...

Mon Aug 14 2006, 07:57PM

Registered Member #56 Joined: Thu Feb 09 2006, 05:02AM
Location: Southern Califorina, USA
Posts: 2445

doh!

Looks like there is a reason that everyone builds marx'es with a lot of space between the stages...

Looks good otherwise

McFluffin

Fri Aug 18 2006, 05:59AM

Registered Member #119 Joined: Fri Feb 10 2006, 06:26AM
Location: USA
Posts: 114

Look cool even if may need some work. Maybe you can dip it in laquer to stop the arching :) I was wondering, if you put a flouresent tube near this, does it light up like a coil would cause it to?

Wilson

Fri Aug 18 2006, 01:59PM

Registered Member #78 Joined: Thu Feb 09 2006, 11:27AM
Location: Sydney, Australia
Posts: 133

i doubt whether it would, because a TC makes a sustained RF field, while this is just a single HVDC pulse discharge. Although I wonder what would happen if u hooked the outputs of the marx across a fluoro tube....

McFluffin

Sat Aug 19 2006, 07:16AM

Registered Member #119 Joined: Fri Feb 10 2006, 06:26AM
Location: USA
Posts: 114

BOOM! Thats what I'd think, but I really don't know a lot about Marx. I thought they pulsed rapidly like a TC does. Guess not. What are those brass ball things? They look nice.
I had an experience a while back where and LED exploded on me. Remembering that and then having a fairly large capacitor bank(~7kJ) I put the LED across it curoius what would happen, hit the button. It shorted out the LED and nothing happend(not even a flash). How dissapointing. So, what I am trying to say is, maybe nothing, but it would be worth a try.

williamn

Sat Aug 19 2006, 04:49PM

Registered Member #55 Joined: Thu Feb 09 2006, 04:56AM
Location:
Posts: 149

Have the marx dishcarge into a antenna.

Steve Ward

Sat Aug 19 2006, 05:34PM

Registered Member #146 Joined: Sun Feb 12 2006, 04:21AM
Location: Austin Tx
Posts: 1055

What size are those resistors? Im running low in carbon comp stuff, so it would be nice to learn of a new source of resistors that would take HV pulses.

I recently made an inductively charged marx generator using magnetos as the inductors (even with the core removed they are 4H). This generator worked great with 15" discharges from 280kV ideal output. I then began trying my own inductors. I tried a 2.5"diameter x 3" winding of 36awg, which provides about 12mH. This seemed to work fine for 3 stages, but dang thats a lot of work winding those things. I then tried 1.2mH, but it didnt perform as well. I think i found my best spark for the 3 stage test unit using inductors (1.2mH) was 4", but with high meg resistors it hit 7", mainly limited by surface tracking across my temporary setup. But, the inductor marx banks do have the unique feature that the output is oscillating at many khz, and i *did* get small streamers to form (that is, sparks, but without ground connection). I was hoping to get it up to 100+ shots a second, but spark gap quenching is turning out to be a real pain. I guess i will return to this next summer.

SpyrosF

Sat Aug 19 2006, 07:28PM

Registered Member #352 Joined: Tue Mar 28 2006, 08:39AM
Location: Greece
Posts: 14

Have the marx dishcarge into a antenna.

are you looking for emp ?

GimpyJoe

Sun Aug 20 2006, 09:17PM

Registered Member #316 Joined: Mon Mar 13 2006, 01:30PM
Location: Marietta, GA
Posts: 212

williamn wrote ...

Have the marx dishcarge into a antenna.

Thus killing your computers, and the computers of all your neighbors... If you want to do this, definetly make a faraday cage.

Marko

Sun Aug 20 2006, 09:24PM

Registered Member #89 Joined: Thu Feb 09 2006, 02:40PM
Location: Zadar, Croatia
Posts: 3145

Considering I ran a DRSSTC meter away from open computer case and grounded to same mains 0 (no green wire) I think such and ''EMP'' is a hard way to go...

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