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Re: RE- New Coiler
From: Robert Michaels[SMTP:robert.michaels-at-online.sme-dot-org]
Sent: Wednesday, September 10, 1997 5:43 AM
To: tesla-at-pupman-dot-com
Subject: RE- New Coiler
TL>From: Patrick J. Gustafson[SMTP:gustafpj-at-uwec.edu]
TL>1. I have a two layer secondary coil with 28 gauge wire close wound
TL>for 21.6" (both layers). The first layer is at 6" in dia. and the
TL>second layer is at 6.125" in dia. The calculated resonant freq's are
TL>108.71 kHz and 106.45 kHz respectively, and the calculated inductances
TL>are 91.84 mH and 95.49 mH also respectively. Now since I layered in
TL>parallel, can I add together the inductance values directly? ( i.e. the
TL>new value would be 187.33 mH)
Yes - physics-major-person. Inductances in parallel sum
arithmetically.
TL>2. Should I be concerned with the differing resonant freq's when
TL>calculating the needed primary capacitance?
You don't in fact have differing resonant frequencies. The
two coils in parallel have but a single resonant frequency.
It's a puzzle as to how you =calculated= the resonant
frequencies without first knowing the distributed capacitance.
Most of us =measure= the resonant frequency. Always a
good idea since calculations may/may not follow reality
well.
[ ... ]
[ ... ]
[ ... ]
TL> - Primary capacitor (Calculated to need about .0226 uF. Anyone have
TL>problems with using mylar for the di-electric?)
Never, ever, ever, ever, ever, use Mylar (or any other
polyester) in Tesla service.
Never!
TL>Some info:
TL>I am a Physic's major, mathematics minor at the University of Wisconsin
Phwew! I'm Glad you're not an English major - then I'd have
been worried.
In English - an apostrophe signifies the possessive
case. Plurals are formed by adding an "s" with no
apostrophe.
Physics just happens to be a word with an "s" at the
end. It's a collective noun which is not plural,
or possessive.
Same as mathematics, or mechanics
Hey -- you may have to be able to spell it to pass
the final exam for graduation -- you never know.
TL>Eau Claire, so I am quite familiar with most of the terminology involved
Yup, glad.
TL>in Tesla coils. This is my first Tesla coil project, which I am
TL>building for the Physic's Dept. (and they are funding!!) for
Damn glad!
TL>Any help greatly appreciated.
I tried.
Beer-drinker/Pizza-eater
[ it's a double major ]
in -- Detroit, USA
(and able to spell both when
reasonably sober)
Robert Michaels, B.D.P.E
Pop Quiz: Under what circumstances should Mylar be used
-------- in Tesla coils?
For Extra Credit: Mylar is a proprietary name (E. I. DuPont)
---------------- for what class of polymers?