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Re: TESLAC spit this out
Tesla List wrote:
>
> > Subject: TESLAC spit this out
>
> Subscriber: bert.hickman-at-aquila-dot-com Mon Jan 27 22:02:38 1997
> Date: Sun, 26 Jan 1997 23:14:47 -0800
> From: Bert Hickman <bert.hickman-at-aquila-dot-com>
> To: tesla-at-pupman-dot-com
> Subject: Re: TESLAC spit this out
>
> Tesla List wrote:
> >
> > Subscriber: randyl-at-ronan-dot-net Sun Jan 26 13:32:44 1997
> > Date: Sun, 26 Jan 1997 00:55:22 -0600
> > From: Nathan Lamphere <randyl-at-ronan-dot-net>
> > To: tesla-at-pupman-dot-com
> > Subject: TESLAC spit this out
> >
> > Hello all
> >
> > I just got my first x-former yesterday. It is an actown outputting 9000
> > v-at-30ma. Simply had to repace the pull switch and now it works great.
> >
> > I downloaded Teslac and have been trying to figure out what I needed to
> > build a TC.
> >
> > Here is what I came up using Teslac:
> >
> > First of all I have a actown neon x-former with secondaries rated for
> > 9000 volts -at- 30 ma. Yeah, at least now I have the transformer:)
> >
> > 1) For the capacitor if I use two 14" X 14" (overlap measurement) flat
> > plates seperated by a sheet of mica (I have not seen how difficult this
> > is going to be to get yet), I can get a rating of 56KV with a .04 in.
> > thickness. Does this seem right?
>
> Mica is not generally available in large sheets. Reconstituted mica
> (ground up and made into a flexible paper-like material) is also not
> usually available in large sheet sizes, and even if it was would not
> give you the large breakdown voltage you need, and will be rather lossy.
> Glass plates would be more available, or better yet a rolled LDPE
> capacitor (see the funet site for constructiono details). You'll need
> about 0.01 uF for this coil (using the values of primary inductance and
> desired secondary/toroid frequency below).
>
> The funet site is at: ftp://nic.funet.fi/pub/sci/electrical/tesla/
>
> >
> > 2) For the secondary I (and yes, randomly chose) chose a height of 20
> > inches, 6 inch diameter coil wound with 20 gauge wire. I plan on doing
> > this on pvc-type pipe. This is what I was given for calculations:
> >
> > The number of turns is: 588.2353 closewound with .034 inch dia. wire
> > Secondary winding length is 20 inches
> > Secondary winding diameter is 6 inches
> > Rsonant freq. is approx. 423.5564 KHZ.
> > The required wire length is 923.5294 feet
> > The aspect ratio (H/D) is 3.333333
> > Reactance is 36491.33 ohms at 423.5564 KHZ.
> > The maximun unloaded Q is 146.6225 at 423.5564 KHZ.
> > The secondary inductance is approx. 13.71888 MILLIHENRY
> > The estimated loaded Q will be approx. 65.16554
> > The terminal capapticance should be large enough to
> > cause the resonant freq. to drop to approx. 296.4895 KHZ.
> >
> > 3) For the static gap, TESLAC asked for how many volts my transformer
> > is rated for and here is the response it gave:
> >
> > WHAT IS YOUR TRANSFORMER R.M.S. SECONDARY VOLTAGE
> > ? 9000
> > THIS SERIES GAP SYSTEM SHOULD BE BUILT WITH 8.0 GAPS
> > EACH GAP SHOULD BE SET AT APPROX. .025 INCH
> >
> > AND COOLED BY AN AIR BLAST AT POWER LEVELS ABOVE 1 KILOWATT
> >
> > What does it mean to have 8.0 gaps? How does a person go about making a
> > gap or if I need 8 of them, how do I make that?
>
> Richard Quick developed a spark gap which uses multiple segments of
> copper pipe housed within a 6" diameter PVC pipe, cooled by a boxer fan.
> By breaking up the gap into a number of "pieces", the gap can be rapidly
> extinguished ("quenched") to get better coil performance. Check out the
> funet site for more details on this type of gap as well as an air-blast
> gap.
> >
> > 4)This takes me to the primary coil. I decided to figure it out using
> > 3/8" copper tubing, with spacing 3/8" turn spacing and 2 inches between
> > the secondary and the primary.
> >
> > Here is the response for it:
> >
> > YOU NEED 45.7 U.H. TO RESONATE AT 296.4895
> > KHZ.
> > THE INDUCTANCE AT TURN NUMBER 3 IS APPROX. 4.7
> > U.H.
> > THE INDUCTANCE AT TURN NUMBER 4 IS APPROX. 8.0
> > U.H.
> > THE INDUCTANCE AT TURN NUMBER 5 IS APPROX. 12.3
> > U.H.
> > THE INDUCTANCE AT TURN NUMBER 6 IS APPROX. 17.6
> > U.H.
> > THE INDUCTANCE AT TURN NUMBER 7 IS APPROX. 24.0
> > U.H.
> > THE INDUCTANCE AT TURN NUMBER 8 IS APPROX. 31.4
> > U.H.
> > THE INDUCTANCE AT TURN NUMBER 9 IS APPROX. 40.0
> > U.H.
> > THE INDUCTANCE AT TURN NUMBER 10 IS APPROX. 49.9
> > U.H.
> > THE PRIMARY INSIDE DIAMETER WILL BE 10
> > INCHES
> > THE PRIMARY OUTSIDE DIAMETER WILL BE 24.25
> > INCHES
> > IT WILL HAVE 10 TURNS OF .375 INCH
> > CONDUCTOR
> > THE TURN TO TURN SPACING WILL BE .375
> > INCH.
> >
> > Ok, I realilze that there was alot to this post, but if any of you have
> > the time, could you please go over it and tell me where the design is
> > wrong or suggestions on what to do to make this thing work, I sure would
> > appreciate it!
> >
> >
> > --
> > Nathan Lamphere
> > http://www.ronan-dot-net/~randyl/nfolder/nathan.html
> > Javascripts: WebPageMaker - easily create your own webpage right online!
>
> Basically, the calculations look good! A toroid made from 4" aluminum
> dryer duct and two back-to-back pie pans (approx. 16" outermost
> diameter) will provide about the right amount of top-end capacitance
> (about 17 pF derated down to about 13 pF when mounted atop your coil).
>
> Good Luck, and safew coilin' to you, Nathan!
>
> -- Bert --
Bert
Thanks for the info - I have another question for you. I wrote to a
capacitor company last night and they said this: (repost of their
letter)
Subject:
Re: Capacitor info
Date:
Tue, 28 Jan 1997 09:35:45 -0500 (EST)
From:
Motorcap-at-aol-dot-com
To:
randyl-at-ronan-dot-net
Thanks for your inquiry -
1 pc. P/N 3887 (0.0066 uF., 20 KVDC) in stock.
Steel Can w/ 2 HV Ceramic Bushings w/ Solder Lugs.
Standard Price - $87.50 ea. but we'll allow you a special
Student Price - $35.00 ea.
This is a DC capacitor. Let us know if this will work you you.
Will this work???? If so I better jump on it, I believe.
Thanks again,
Nathan
--
Nathan Lamphere
http://www.ronan-dot-net/~randyl/nfolder/nathan.html
Javascripts: WebPageMaker - easily create your own webpage right online!