Re: How much does aspect ratio of secondary really matter (is it all about K ...

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "J. Aaron Holmes" <jaholmes@xxxxxxxxxxxxxxxxxx>

I should add that I'll be resistively ballasting the
PT on the high side with adjustable power resistors to
*hopefully* time it so that cap charges to 2700V 120
times a second.  We'll see how well that works :)
I've got a 2700pF doorknob cap and a 3kV MOV lightning
arrestor, so with these parts thrown in, my ballast
oughta double as a Terry filter for my wimpy little
200VA PT.

--- "J. Aaron Holmes" <jaholmes@xxxxxxxxxxxxxxxxxx>
wrote:

> Thanks, all who responded!  Yeah, I considered the
> streamer length thing.  Here's the synopsis of the
> coil as I see it now:
>
> The coil's going to be about 150W.  My planned
> secondary height is 24" with a diameter of 10".
> Again, short and fat so as to be both physically
> small
> and low-frequency.  About 1250 turns of #26 wire.
> 6"x22" dryer duct toroid.  Four turns on the primary
> with a 342nF cap.  2400V PT for a power supply,
> rectified.  Three "Fritz" SISG modules for a spark
> gap.
>
> Hope it works ;-)  I've got all my IGBTs now :-))
>
> aaron
>
>
> --- Tesla list <tesla@xxxxxxxxxx> wrote:
>
> > Original poster: FutureT@xxxxxxx
> >
> > In a message dated 5/31/06 6:26:29 PM Eastern
> > Daylight Time,
> > tesla@xxxxxxxxxx writes:
> >
> >
> > >A lot of what's advocated as being *best* doesn't
> > really
> > >make a lot of difference in performance in
> general.
> > >Generally what's important in coils is; power
> > throughput,
> > >proper toroid size, good spark gap, etc.
> > >
> > >John
> >
> >
> > Aaron,
> >
> > I'm adding to my post here.  Certainly the coil
> > whatever
> > the aspect ratio has to be tall enough so you
> don't
> > get
> > breakdown from top to bottom of the secondary.  I
> > was
> > assuming that in my last posting, but I figure I
> > should
> > mention it.  One hears that streamers can reach
> > about
> > 3 or 4 times the secondary length as a maximum,
> and
> > that is
> > true it seems.  Depending on the breakrate and
> other
> > factors,
> > breakdown may occur with less streamer length.
> >
> > J
> >
> >
> >
>
>