Re: Marx generator (fwd)

[<sroys@xxxxxxxxxxxxxxxxx>]

---------- Forwarded message ----------
Date: Fri, 1 Oct 2004 06:26:49 -0500
From: Dr. Resonance <resonance@xxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: Marx generator (fwd)


Any value in the 50K to 250K will work fine.  Be sure the total is rated for
the "per stage" charging potential.  Can't cheat much here or it will
misfire a lot.

Dr. Resonance

>
> Dr. Resonance <resonance@xxxxxxxxxx> wrote:
> > Each diode string has to be rated at 2.8 for peak reverse voltage.
>
> Usually I use a factor of 3.5 and for this application three diodes
> out of microwave ovens per leg should be sufficient. AFAIK they have
> kind of avalanche characteristic and parallelling them with resistors
> should be unnecessary despite they are not manufactured in the same
> production lot. ok?
>
> > Be sure to use an inductance in series with the output and a resistor
> > plus inductor on the charging power supply in case the unit "prefires"
> > while charging.  This happens when you are setting up your initial
> > sparkgap settings.
>
> > The diodes were a string in series and then inserted into a teflon
> > tube --- open on each end for ventilation.  Resistors were 2 watt
> > units at 5 kV.
>
> Very useful hints! Thank you. Which resistance should I choose?
>
> Herwig
>
>
>
> ---------------------------------------
> Greed is the root of all evil!
> ---------------------------------------
>
>
>