Re: Marx using inductors (fwd)

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Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 21 Jun 2006 13:14:48 -0700
From: Jonathan Peakall <jpeakall@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Marx using inductors (fwd)

Thanks for all the replies.

While digging around I came across some HV (I think) resistors. I am not
sure if they are wirewound. They are marked :

CVD 1%
RN30X
5004F
5M

Thet are about 52mm/2" long and they do indeed measure 5mOhm as the 5M
suggests. I have 20 of them. Would it matter if they are wire wound or not?

As for the rest of the system, I was thinking of using a 12/120 NST that I
have, running it into a voltage doubler. If I did the mat right (always
doubtful) I should wind up with about 33.6 kV. That leaves me a little more
margin for the caps than I'd like, but a 15/120 NST would be 42kV, too high
for the caps.

If I did use the resistors rather than inductors, how would I calculate the
break rate, assuming the 12/120 NST, a voltage doubler and the 5mOhm
resistors? I realize factors like corona loss, etc, will come into play, but
just looking for a way to ballpark it.

As to the inductors, I had thought about ferrite cores, but for some reason
figgered that that wouldn't be OK. Of course, unless I can scrounge the
ferrite slugs they will add cost too. Any figures on what the minimum usable
inductance is?

Thanks for all the suggestions. I will indees use Tesla coils style
construction, sand and finish the PVC and make  2-3 stages first and work
out the kinks.

Jonathan
www.madlabs.info