Re: NEW COILER QUESTIONS

• To: tesla-at-pupman-dot-com
• Subject: Re: NEW COILER QUESTIONS
• From: "Gregory R. Hunter" <ghunter-at-accucomm-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
• Date: Tue, 05 Oct 1999 08:13:05 -0600
• Approved: twftesla-at-uswest-dot-net
• Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

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

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