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Re: tesla primary
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To: tesla-at-grendel.objinc-dot-com
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Subject: Re: tesla primary
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From: Esondrmn-at-aol-dot-com
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Date: Thu, 14 Mar 1996 11:57:14 -0500
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>Received: from emout08.mail.aol-dot-com (emout08.mx.aol-dot-com [198.81.11.23]) by uucp-1.csn-dot-net (8.6.12/8.6.12) with ESMTP id JAA04906 for <tesla-at-grendel.objinc-dot-com>; Thu, 14 Mar 1996 09:56:39 -0700
In a message dated 96-03-13 14:46:38 EST, you write:
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>Hey All,
>
>In advance - Thank you for your patience. I have a question regarding the
>topology of tesla primaries.
>
>The pictures I have seen of Tesla's coils have the primaries stacked in a
>vertical cylinder, a uniform distance from the secondary...
>
>The pictures I have seen of modern Tesla coils (ie... R. Quick's outstanding
>video and stills) have the primary lying in a horizontal plane,
perpindicular
>to the secondary, spiraling away in an ever-increasing arc...
>
>Others even have a combination of both...
>
>
>What is the difference? Is it (I suspect) an issue of Q? or is there a
>tuning issue?
>
>Bruce Boettjer
>
Bruce,
You want a physically large primary with 14 to 15 turns for best effeciency.
You want to design the frequency of the system so the primary tunes at least
at 8 to 9 turns, better would be 12 to 14 turns. For coils up to 1.5 to 2.0
kva, a primary wound in a saucer shape at 30 degrees inclination works best.
For higher power systems a flat pancake type primary works best. Because of
the high frequency skin effect, soft copper tubing seems to be the choice for
the primary conductor. This also provides low resistance for high Q. With
both primaries you can control coupling by raising or lowering the secondary
with respect to the primary.
Ed Sonderman