[Prev][Next][Index][Thread]
Re: NEW COILER QUESTIONS
At 02:42 PM 10/03/1999 -0600, you wrote:
>Original Poster: Norman Hockler <norsan-at-bright-dot-net>
>
>Hi Gang...
>
>Would like to build a coil and I have a few questions.
>
>1. I have a cap rated at 1 uf -at- 25kv. cap says its DC but there is no
>polarity marking on the cap. can I use it ???
1uF is too big. I don't think you can use it as a tank cap.
>
>2. I have seen pictures of the primary coil wound vertical,
>horizontal and conical...what are the differences in results.
Not much. A plain vertical cylinder is simplest & cheapest because you can
use PVC pipe or cardboard tube. Conical forms are hard to find.
Horizontal secondary is a bipolar coil, which is somewhat more challenging
to design and adjust properly. On the plus side, it doesn't require an RF
ground.
>
>3. I have a small dc motor that I can control the speed ....I am thinking
>of using it to power a Rotary spark gap. Cant I tune the primary by
>changing the speed of the motor??
No, you can't tune the primary with the spark gap. The Tesla coil spark
gap behaves like a switch, not a tuner. Frequency is governed by the
resonant components (primary coil & capacitor, and secondary
self-resonance). Most folks tune the primary by selecting different turns
until max spark is achieved.
>
>Appreciate your responses.
>
>Norm
Best Regards,
Greg