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Forums
4hv.org :: Forums :: High Voltage
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choice of resistor for marx generator

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paulj
Mon Sept 30 2019, 07:30PM Print
paulj Registered Member #59353 Joined: Sun Apr 17 2016, 02:08PM
Location: France
Posts: 84
 		Hello, I ask a question probably already asked.
I acquired 10 capacitors TDK 2nf 40kv, I want to realize the most powerful possible marx generator

I think I use Wirewound but I don't know how to calculate it's values.

What do you recommend ?

Paul
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Plasma
Tue Oct 01 2019, 12:07AM
Plasma Registered Member #61406 Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
 		Hi. This ones are quite reasonable, the site as got quite good stuff

Link2
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Patrick
Tue Oct 01 2019, 07:19AM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
 		Wire wound resistors aren't used for HV, use Ruthenium based resistors meant for it.
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paulj
Tue Oct 01 2019, 11:31AM
paulj Registered Member #59353 Joined: Sun Apr 17 2016, 02:08PM
Location: France
Posts: 84
 		50 meg is not a bit high? But actually their price is reasonable, for Glass Glaze Film.

Resistance based on ruthenium, can you be more precis?
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Plasma
Tue Oct 01 2019, 12:15PM
Plasma Registered Member #61406 Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
 		Yeah you could divide by 100 I just looked at the kV
Is it series or parrelel? The below is parrelel.

011056
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paulj
Tue Oct 01 2019, 04:09PM
paulj Registered Member #59353 Joined: Sun Apr 17 2016, 02:08PM
Location: France
Posts: 84
 		The stages will be in series.
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Patrick
Tue Oct 01 2019, 06:32PM
Patrick Registered Member #2431 Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
paulj wrote ...

Resistance based on ruthenium, can you be more precis?

I used to have pics here on the forum, but Caddock, Dale and other makers all use ruthenium (atomic element 44, Ru) for HV, instead of carbon or nichrome. HV can fields above a certain intensity can "squeeze" for lack of a better term the carbon to a different resistance when powered.

dont forget that these resistors which may be rated for 30kV only have 1kV of insulation around the body, so oil or something may be needed.

PICTURES !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!?????????? ???????????????????????

ok look here forgive my website, its abit wrecked at the moment.
Link2
Link2
Link2
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MRMILSTAR
Tue Oct 01 2019, 06:50PM
MRMILSTAR Registered Member #62119 Joined: Sun Feb 04 2018, 04:59AM
Location: Cedar Rapids, Iowa
Posts: 136
 		I have one of those Chinese 20-stage Marx generators that I built from a kit. It works well and produces 12" sparks about every 2 seconds. It uses two (one for each side) 10M ohm resistors for the initial stage immediately following the HV supply and 38 (19 on each side) 1M ohm resistors for the subsequent stages. It uses twenty 2 nF capacitors claimed to be rated for 30 KV for the stages. The capacitors and resistors are readily available on E-Bay for low prices. Just google "Marx generator".

I don't claim that any of these values are optimal. It does work well though. Here's a tip though. Use batteries to power your Marx generator. Connecting it to wall power can endanger anything electronic plugged into your house wiring if a HV spike kicks back into your power supply. I destroyed a switching power supply before I switched to battery power.
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paulj
Tue Oct 01 2019, 06:57PM
paulj Registered Member #59353 Joined: Sun Apr 17 2016, 02:08PM
Location: France
Posts: 84
 		Thank you for your answers,

It is nice to listen to different points of view, I was always advised to avoid metal layer resistors for high voltage. rolleyes

Resistances based on ruthénium are expensive it's boring!

Link2 Looking at an old site steve Ward, he used resistors 1 meg carbon (because not expensive) for 560pf capacitors per floor.

I have TDK capacitors uhv-9a I think 1 meg is still too high 500k is a good start?

ps: Like many members of the forum I have difficulties to put my images, it's a shame, I hope to shoot a video at the end of the installation.
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Plasma
Tue Oct 01 2019, 09:48PM
Plasma Registered Member #61406 Joined: Thu Jan 05 2017, 11:31PM
Location:
Posts: 268
 		For pictures if you click the tree icon and paste something like htt ps: / /i.ibb.co/SQrbmkm/IMG-20191002-011056.jpg

It should display but its hosted off site.
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