[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
RE: New guy plans (fwd)
---------- Forwarded message ----------
Date: Wed, 22 Aug 2007 09:17:16 -0400
From: "Lau, Gary" <Gary.Lau@xxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: RE: New guy plans (fwd)
I think you're off by a decimal point. As Bryan speculated, LTR for his
NST is .007uF, assuming 60 Hz power. But the sweet spot is not a narrow
target; anything in that neighborhood is fine. I prefer to lean to the
high side, so .007 to .01uF.
I would reconsider the MMC construction. While a string of 19 0.15uF
caps would give you .0079uF/38kV, you're spending more money on more
caps than you need to. If you chose cheaper 0.1uF caps, you'd only need
a string of 12 to give you a .0083uF/24kV cap.
1/2" tubing is overkill for any NST-powered coil. 1/4" tubing would be
more than adequate, more compact, and much easier to work with.
Not sure that you need the HV wire if you keep the wiring short and
direct. For the tank circuit (gap-cap-primary-gap loop), you may want
to use something heavier than the GTO wire.
Regards, Gary Lau
> .074uf is the LTR capacitor value you want.
> drake schutt
> On 8/21/07, Tesla list <tesla@xxxxxxxxxx> wrote:
> > ---------- Forwarded message ----------
> > Date: Tue, 21 Aug 2007 19:17:41 -0700
> > From: Bryan Polinder <b.polinder@xxxxxxxxxxx>
> > To: tesla@xxxxxxxxxx
> > Subject: New guy plans
> > Hello all
> > new to the list an finally acting on the bug that bit me 30 years
> > building a coil.
> > So far I'm in the gathering the components stage . have the
> > 15kv 30ma neon sign transformer
> > components for a RQ type spark gap
> > 100ft of 1/2 inch copper tubing
> > 50 ft superflex GTO-15 hv wire
> > Next on the list is the capacitor.. using the various calculators
> > there I figure I need about .007uf ? resonant for the transformer
> > .0053 but from what I have read using a static spark gap you need a
> > .. is this enough? I am planning on a MMC using Cornell-Dubillier
> > 942C20P15K-F one string of 19 for .0078uf and 38kv or.. should I go
> > Maxwell at .03uf and 35kv? <this capacitor thing is making my head
> > after that it wont be too much worry to get a secondary wound I
> > access to a coil winding machine I haven't figured out the specs on
> > yet when I get that figured I can figure out the primary .
> > I also have 1 833a transmitting tube I picked up somewhere but
> > better start with a spark gap coil before I try my hand at a tube
> > So my fine fellows.. does it sound like I'm on the right track or
> > gone horribly astray? any comments and or advise would be greatly
> > appreciated .