Re: TC for VDG injection

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <DR.RESONANCE-at-next-wave-dot-net>


5-7 kV DC at 500 uA to 1 mA will work great for your VDGRF spray screen.  Be
sure the belt to edge of pulley width is at least 1 inch so that the spray
screen does not "see" the bare pulley directly or all your charge will just
leak off the edges to the pulley.

Ground the upper terminal and set the machine on a table in from of you in a
totally dark room.  Let your eyes adjust and then you can see the spray
pattern.

Run your pulley around 2000-2600 RPM for good operation.

Best performance is with a postive spray.  This gives a much thicker output
spark.

Dr. Resonance



----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Tuesday, July 16, 2002 5:25 PM
Subject: Re: TC for VDG injection


> Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<davep-at-quik-dot-com>
>
> > I dont want to aggravate anyone by presenting a subject
>
> > that is to far offtopic, but next on my list of mad
>
> > scientist devices is building a Vandegraf generator
> > I am wondering if anyone has recently found any good info
>
> > on the net about van de Graff construction.
>
> > Especially injection type VDG devices...
>
> > I think you can build 2 types of Vandegraf machines
> > 1 is a belt / pulley driven system with specific rollers for
>
> > generating a charge and the other is an injection system.
>
> >I know very little of this type.
>
> Same as the first, save that the lower brush is
> driven from a DC supply, to allow faster build up,
> higher currents.
>
> > I am curious know if tesla coils are used as the electron
>
> > injection device onto the van de Graff belt sytem?
>
> Could be but:
> Injection source needs to be DC.  Tesla coils are
> mostly AC.
>
> Also:
> 15KV or so is plenty for the injector, mostly.
> Using a TC system for this would be MASSIVE over
> complication.  (eg: CRT supply, laser toner
> ion spray supply, etc, would be apropos.)
>
> (Olde Phart Story:
> Buddy of mine in HS hotwired The School TV Set
> video B+ to the HS van De Graaff attempting to
> do this.  Sort of worked....)
>
>
> > The information I have read kind of hinted at this but
>
> > went on to say that you didn't want to mess with this
>
> > dangerous stuff...
>
> Takes some care.  van de Graaf currents go up with
> such a rig....
>
>
> best
> dwp
>
> ...the net of a million lies...
> Vernor Vinge
> There are Many Web Sites which Say Many Things.
> -me
>
>
>