Re: NST Current Limiting

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

Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>" <dhmccauley-at-spacecatlighting-dot-com>

My bad.  My statement was based on the fact of running a conventional coil
with a 12kv/30mA NST.
Dan

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, January 18, 2003 8:29 PM
Subject: Re: NST Current Limiting


 > Original poster: "Daniel Reinders by way of Terry Fritz
<teslalist-at-qwest-dot-net>" <danreind-at-shaw.ca>
 >
 > Thanks for the input,
 >
 > The trouble with Geek Group Caps for a Marx Generator is you need the full
 > complement for each stage (10 stages presently).  So one would need
roughly
 > 8-10 Geek caps per stage to withstand the voltage, times 10 stages meaning
 > 100 capacitors total, at $300 bucks this would be a pricey way to go.
 > Besides, I need those caps to go into my new, improved Tesla Coil ;).  And
 > yes, a Marx generator is definitely the hard way of making sparks - no
 > comparison with a Tesla coil.  But it was still fun to do...
 >
 > If primary ballasting is too much of an issue, it may just mean investing
in
 > an appropriately sized power supply.  I'm just sort of swimming in 12/30
 > NST's at the moment (don't ask - I got plans for 'em), so I was going the
 > "easy" route for now.  Or is ballasting a feasible alternative.  Are there
 > differences for ballasting a pole-pig vs ballasting an inherently
ballasted
 > NST?
 >
 > Thanks,
 >
 > Dan Reinders
 > ----- Original Message -----
 > From: Tesla list <tesla-at-pupman-dot-com>
 > To: <tesla-at-pupman-dot-com>
 > Sent: Saturday, January 18, 2003 2:00 PM
 > Subject: Re: NST Current Limiting
 >
 >
 >  > Original poster: "by way of Terry Fritz <teslalist-at-qwest-dot-net>"
 > <dhmccauley-at-spacecatlighting-dot-com>
 >  >
 >  > In my opinion, I think you should just get the proper capacitors.
 >  >
 >  > Either way you go, you are going to need additional items to accomplish
 > what
 >  > you ask.  Those extra items might as well be capacitors instead of some
 > sort
 >  > of
 >  > ballast on the primary side.  Assuming your NST is sealed, adding
shunts
 >  > would probably be a very difficult process.
 >  >
 >  > All you need is a 0.066uF capacitor.
 >  > Thats about 16 of the geek group caps at approx. $3.00 apiece.  For
only
 >  > $48.00 you can accomplish what you need with proven capacitors not
worry
 >  > about anything else.
 >  > http://www.thegeekgroup-dot-org/mmc
 >  >
 >  > I believe they have some in stock now for immediate delivery.
 >  >
 >  > Dan
 >  >
 >  >
 >  >
 >  >
 >  >  > Hi Everybody,
 >  >  >
 >  >  > I find myself in a rather rare position on this list.  I'm trying to
 > get
 >  >  > LESS current out of my neon sign transformer.  I had built a Marx
 >  >  > generator, and was running it off of a 12/30 NST (possible since
 > charging
 >  >  > rate >> 60 Hz), or at least I was until the capacitors spewed smoke
one
 > by
 >  >  > one.  Guess those 10 kv/0.001 ufd ceramics just aren't up to the
job.
 >  >  >
 >  >  > We'll I've got a bunch of new capacitors that I'm hoping will do the
 >  >  > trick.  The only catch is that their capacitance is much lower.  So
the
 >  >  > Marx generator fires successfully, and then an arc gets established
 > that
 >  >  > does not "quench" - hence no more Marx arcs.  I figure that if I
scale
 >  > back
 >  >  > the current to better match the capacitors it should do the trick.
So
 > I'm
 >  >  > wondering what is the best way to do this without losing
 >  >  > voltage?  Admittedly a non-Tesla question but I hope you'll indulge
me.
 >  >  >
 >  >  > Thanks,
 >  >  >
 >  >  > Dan Reinders
 >  >  >
 >  >  >
 >  >  >
 >  >  >
 >  >  >
 >  >
 >  >
 >
 >
 >
 >
 >