Re: rectified nst's and hookup

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

Original poster: "Jim Lux by way of Terry Fritz <twftesla-at-uswest-dot-net>" <jimlux-at-earthlink-dot-net>

And, you WILL NOT get rated voltage out of a NST with significant load.  At
half rated load (i.e. 30 mA on a 60 mA transformer), you'll be lucky to get
half the rated voltage out.  This is particularly insidious with voltage
multipliers, because there are so many other things that can screw up your
output ripple and regulation (regulation =  how much the voltage drops with
a given load current).

----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Friday, April 06, 2001 9:06 PM
Subject: Re: rectified nst's and hookup


> Original poster: "Kevin Ottalini by way of Terry Fritz
<twftesla-at-uswest-dot-net>" <ottalini-at-mindspring-dot-com>
>
> Marc:
> I assume that the "other side" of the tank cap goes to the
> "other side" of the primary ...
>
> You definitely need a limiter resistor on both legs if you do
> it this way.  I usually hook ground to the "DC-" side and
> run single ended:
>
>   ftp://ftp.mindspring-dot-com/users/ottalini/highvoltage/DCCOIL/DCSCH2A.PDF
>
> I would recommend 20K ohms to start and down to 10K once things
> are stable.  I have had problems with NSTs running in a full-wave
> configuration due to the floating centertap which really, REALLY
> wants to be ground referenced (but you can't because it will ground
> loop with only diodes).
>
> If you need to convert, put a largeish cap in series with each AC leg
> and convert to a single-stage full-wave Cockroft.  For sustained full
> load with a 15kv, 60ma NST my simulator says you need around 1uFd
> at ~12kv (1.414*7500vac).  These can be non-pulse type caps (I use
> older oil-type).  You still need the limiter resisters to keep from
> blowing the diodes.
>
> Best,
> Kevin
>
>
> ----------
> > From: Tesla list <tesla-at-pupman-dot-com>
> > To: tesla-at-pupman-dot-com
> > Subject: rectified nst's and hookup
> > Date: Friday, April 06, 2001 11:15 AM
> >
> > Original poster: "Metlicka Marc by way of Terry Fritz
> <twftesla-at-uswest-dot-net>" <mystuffs-at-orwell-dot-net>
> >
> > all,
> > i built a hv bridge out of three 12kv\550ma diodes per leg giving me a
> > theoretical 36kv bridge.
> > my question is:
> > i hooked each hv term. of the 12\30 nst to each AC leg of the bridge,
> > from +dc out to tank cap, from tank cap out to one side of the sync.
> > triggered spark gap, from the other electrode out to the primary, from
> > the primary too the -dc side of the bridge. does this sound right?
> > i never even looked at a dc tc before and would hate to blow something
> > up.
> > i don't want to put power to it until i get some input first.
> > thanks in advance,
> > marc m.
> >
> >
>
>
>