Re: Marx using inductors (fwd)

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Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Fri, 23 Jun 2006 10:54:27 +0800
From: Peter Terren <pterren@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Marx using inductors (fwd)

Never made a Marx myself but I would have thought it wise to have the 
driving voltage referenced to ground.  Otherwise any sparks or leakage 
currents from the output to ground will blow diodes in your multiplier. So 
you need to use only half of your NST to keep the ground reference.

Peter
.
----- Original Message ----- 
From: "High Voltage list" <hvlist@xxxxxxxxxx>
To: "hvlist" <hvlist@xxxxxxxxxx>
Sent: Thursday, June 22, 2006 9:42 PM
Subject: Re: Marx using inductors (fwd)


> 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
>
>
>
>
>
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