Re: Large flybacks for HV work

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

Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>" <resonance-at-jvlnet-dot-com>


Ed:

We use a simple MOSFET circuit operating at 1 AC Amp input, 120 VAC.

It will strike between sharp points at around 1.3 in and can be "pulled" up
to 2-3 inches in a climbing arc mode.

Regards,

D.C. Cox





----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Saturday, August 03, 2002 1:07 PM
Subject: Re: Large flybacks for HV work


> Original poster: "Ed Phillips by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<evp-at-pacbell-dot-net>
>
> Tesla list wrote:
> >
> > Original poster: "D.C. Cox by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <resonance-at-jvlnet-dot-com>
> >
> >
> >
> >
> >
> > Very large flyback transformers available:
> >
> > If anyone on the list needs some super large flybacks for experimental
work I
> > have a bunch that were special runs for RRC with 4,000 turns of #39 AWG
> on the
> > sec. and a center tapped 16 turn primary already on the core.  Covered
> > completely in nice grey silicone RTV (dipped in vacuum chamber).
> >
> > These are 10% large than the old 1970's TV flybacks that produced a
> > steady-state 30 kV DC.  These will also produce a steady 32 kV DC with
only a
> > rectifier and HV diode string.  They also perform great as a HV power
supply
> > with either single wave or doubler rectification (60 kV DC with doubler
> > circuit) delivering 2-3 mA of steady state current.
> >
> > Operated as a Tesla coil they produce a solid 1.75 inch arc in open air
off a
> > needle electrode.  They light up flourescent tubes, neon tubes, and
argon
> tubes
> > without wires.  Just connect output to a "radiator plate" of aluminum
for
> > special effects.
> >
> > I have some remaining extra run units that I'm selling off for $45 per
unit.
> > Estimate shipping at $6.85 USPS or UPS to most CONUS locations.
> >
> > First come, first served on the remaining units.
>
> I'm very interested, but a couple of questions first.
>
> 1. What is the driving circuit you use?  Is it a "flyback" circuit or a
> switching converter?
>
> 2. Is that 1.75 inch arc the one you get when you bring the secondary
> leads close together and then move then apart?  Seems as if it would
> have to be.  If so, what is the approximate open-circuit breakdown
> length for leads with something approximating needle points?
>
> Ed
>
>