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Re: No chokes, and my gaps (was: Ferrite chokes & sat...)
From: Malcolm Watts[SMTP:MALCOLM-at-directorate.wnp.ac.nz]
Sent: Thursday, November 27, 1997 3:20 PM
To: Tesla List
Subject: Re: No chokes, and my gaps (was: Ferrite chokes & sat...)
Hi Adam,
> From: Adam[SMTP:absmith-at-tiac-dot-net]
> Sent: Thursday, November 27, 1997 1:03 AM
> To: Tesla List
> Subject: Re: No chokes, and my gaps (was: Ferrite chokes & sat...)
>
>
> >That sounds like an awful lot of trouble. You can heavily gap a core
> >but then you are approaching air permeability. My next chokes are
> >going to be air cored. I am going to wind them on old solder bobbins.
> >I will put de-Q'ing resistors externally and make sure the heating in
> >the chokes themselves is kept to a minimum. But then again, I am just
> >about moving away from chokes altogether, at least for neons.
>
> Moving away from chokes on the neons, eh, just bypass caps then?
I would use series resistance as well. I will put my money where my
mouth is shortly. I intend to test this early next week.
> This
> sounds good, but if I removed the chokes from my current system, it would
> put my main gap and safety gap in parallel. As my safety gap has very
> still and static air between the electrodes, and I might expect that
> removing the chokes would cause my safety gap to become ionized and more
> or less short out my main gap.
The safety would have to be set wider of course and its firing
voltage depends on electrode goemetry. The safety gap should never
fire before the main gap, only after the main gap has gone out if it
fires at all. That might not be the case when chokes are used as the
energy built up in them due to Cp charging current is effectively
left between the main gap and the transformer if one considers the
main gap to present a reasonable short circuit.
> BTW, where should my safety gap be set at
> for a 9kV supply? Right now it totals 0.18" center tapped, and my
> main gap is 0.15".
Sound pretty safe to me.
Malcolm