Re: A little design help

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Jonathan Peakall" <jpeakall@xxxxxxxxxxxx>

John,

Well, they are your torroids, so I'm guessing that your design ideas will be
in the ballpark! The information below is just what I'm looking for. The
reccomendation below of  using 12 to 15" of 28 gauge translates to 864 to
1082 turns. I'd like to use some 24 gauge wire I have, so I would have to
wrap 18 to 23" to achieve the same number of turns. As I recall, there is no
negative in a tall secondary, in fact I think it reduces the chance of a
primary strike. Is this true?

I will make the primary from 1/8" refer. tubing as you suggest. I'll have to
look at the caps available for MMC's these days, I plan to go that route.

Thanks for the help!!

Jonathan
www.madlabs.info

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Tuesday, June 13, 2006 4:24 PM
Subject: Re: A little design help


> Original poster: FutureT@xxxxxxx
>
> Jonathan,
>
> For the 6" toroid I'd use a secondary 3" dia x 12" to 15" tall.
> I'd wind it with #28 wire.  A smaller secondary would be OK
> also.  For example it could be 2.5" x 12" tall using #30 wire.
> You could even use a 2" x 10" secondary if you want the
> coils to be really compact.  For the Primary I'd use 1/8"
> copper refrigeration tubing, as many turns as needed to tune.
> Or you can use solid #12 or #10 PVC insulated wire close
> wound, but it's harder to make the tap point.  The insulated
> wire does make a compact primary however.  For a spark
> gap, I'd use a simple 4 section series static gap.  For
> the capacitor, I'd use something rather small in value
> such as 0.005uF.  This way the coil will run at a high
> breakrate and give nicely coalesced sparks.  The 6"
> toroid can probably support sparks up to 20" in length
> or so.  Such small coils can give very nice looking
> sparks.  I remember Sue Gaeta built a similar coil
> and it gave about 18" sparks I guess, using the same
> toroid.  I'm not sure exactly what the specs of her coil
> was.  I'm not sure of the capacitor value she used.  I seem
> to remember that she used a 5/60 NST.
>
> Others may be able to offer tested designs of this type of TC
> because I don't really have a lot of experience building
> this type of coil.
>
> John
>
>
>
>