Primary config for small oscillator

To: tesla-at-poodle.pupman-dot-com
Subject: Primary config for small oscillator
From: Tesla List <tesla-at-stic-dot-net>
Date: Fri, 28 Mar 1997 20:23:53 -0600
Approved: tesla-at-stic-dot-net

Subject: 
        Primary config for small oscillator
  Date: 
        Sat, 29 Mar 1997 04:25:56 -0700
  From: 
        "DR.RESONANCE" <DR.RESONANCE-at-next-wave-dot-net>
    To: 
        "Tesla List" <tesla-at-pupman-dot-com>

tip for primary config:

Start with a flat spiral -- innermost turn about 2 inches from sec.
coilform.  Elevate sec. coil to a position around 3 1/2 inches above
primary.  Try a 16 turn pri. and tap for best tuning.  After best tuning
is
found at a variac setting of around 40%-50% (keep setting constant) then
start elevating the sec. about 1/4 to 1/2 inch at a time until you find
the
best coupling arrangement.  Check your primary tuning again and then you
will be ready for full power run up.

1/2 inch wide copper strip wound on edge with 1/2 spacing makes a nice
small coil primary.  Fit into slots cut into black delrin plastic (1/2
in.
wide x 3/4 in. high x length to fit your baseplate).

DR.RESONANCE-at-next-wave-dot-net

> 
> << 
>  I now have my secondary complete, and am looking for some information
> to
>  decide
>  what type of primary I should make for best results.  I am building a
>  small
>  coil and am using a 15kv 30 ma neon sign transformer.  And my secondary
>  is 15
>  inches tall on 4" pvc with 23 gauge wire.  I'm wondering if I should
>  make a
>  flat "pankake primary", one on a 30 degree incline, or one of straight
>  concentric spirals.  What kind of results have people gotten with these
>  and
>  what seems to work best.  Also can anyone recomend a good spark gap
>  design to
>  use with my coil.
>  
>  
>  
>  Thanks...
>  
>  JP
>   >>
> 
> JP,
> 
> I would use a flat pancake primary of 14 to 15 turns made of #10 solid
> copper
> wire or better yet, 1/4" copper tubing.  If necessary, you can incline
> it
> maybe 10 degrees which will elevate the outside turns a bit to allow
> easier
> tuning.
> 
> The Richard Quick cylindrical gap will work excellent for your coil. 
> Plans
> are to be found at the ftp site.
> 
> Ed Sonderman