Re: Tune?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Bill,

A 15/60 neon with a static gap can take up to a 0.017uF primary cap.  So
you should be able to just add more capacitance to lower the primary
frequency.  You can also add inductance to the primary with another coil
inline or even just a bunch of extra wire added.  These inductances are
pretty small and even a 3 foot length of wire adds considerable inductance.
 A smaller top load will also raise teh secondary frequency to match up to
the primary.

Cheers,

	Terry


At 09:59 PM 1/18/2002 -0800, you wrote:
>I have a 30" tall 6" diameter secondary coil.  The secondary coil is wound
>with #22 gauge magnet wire.  My step up xformer is a 15kv 60ma neon sign
>transformer.  The primary coil was made of 1 gauge stranded wire, 9 turns.
>My coil has an air blast gap and beer bottle capacitors that had an
>estimated capacitance of 0.0073uf.
>
>THIS SETUP PROVED NOT TO WORK.
>
>In re-examining my plans I found that if my coil was 27.5" tall, I would
>need a higher capacitance value, one in the range of 0.0106uf.  More primary
>turns would also be necessary (15).
>
>All of this information I gathered through using Tesla Coil CAD.  My
>secondary coil is 30" tall, the program says I will need more than 15
>primary turns (and doesn't help me more than telling me that) because my
>secondary inductance frequency is too high, above 144khz.
>
>What I am asking is can I use the secondary coil I have built?  If so what
>type of primary design would be effective?
>