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Re: [TCML] multiple coils at same time off one NST

That makes sense, I always assume the spark gap In series.

So when the transformer 'shorts' across the gap what happens to current

That might be a trivial eletrics lesson but I find myself kind of lacking
when it comes to NSTs.


On Wed, Jul 25, 2018, 4:34 PM jimlux <jimlux@xxxxxxxxxxxxx> wrote:

> On 7/25/18 1:59 PM, Matthew Sweeney wrote:
> > How is that possible? With my limited knowledge I would assume this would
> > be quite difficult, what with impedence matching and all that. Wouldn't
> the
> > spark gaps interfere with each other?
> >
> > I would be very interested to know more.
> >
> I would assume that basically the NST acts as a constant current source.
> In one standard configuration (the one I use for NSTs on a single coil)
> it's
> Transformer - spark gap across transformer - series Cpri and Lpri
> So when the gap fires, Cpri, Lpri, and SG form a resonant circuit that
> rings down.
> If you ganged up two coils this way, they'd fire at the same time, but
> the two resonant circuits would only share the spark gap. there's no
> particular reason why the two coils would have the same resonant frequency.
> The transformer would be charging both Cpri in parallel, so the charging
> rate is essentially halved (if the Cpri are the same)
> In the other configuration (more like a DC resonant charging circuit),
> the transformer is across the capacitor, and the spark gap connects
> between Cpri and Lpri.
> This one would be harder to analyze - the two coils share the same Cpri,
> and presumably, one gap would fire before the other, and the other would
> never fire, but if it happened to be "lucky", you might get alternate
> firing of the gaps (or you could use a triggered gap?)
> If the "ringdown" takes, say, 10 RF cycles at 100kHz, that's 0.1
> milliseconds.  That's much shorter than the time to charge the primary
> capacitor (depending on where in the line frequency cycle you are), so
> you could conceivably charge the primary multiple times in a half cycle,
> and fire the gaps more often.
> (Assuming you're "smaller than resonant" sized Cpri)
> >
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