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RE: primary and secondary diameters and more
From: Christopher Stone[SMTP:stone-at-etak-dot-com]
Sent: Monday, December 01, 1997 4:07 AM
To: tesla-at-pupman-dot-com
Subject: Re: primary and secondary diameters and more
Thanks for the information! Here is my current plan:
I would like to build something with a secondary in the range of 3.5 to 4"
diameter, with a neon transformer up to 60ma 12Kv, commercial caps. I
would like to have 12-36" sparks. As of now I have only a few parts
and have started to build the spark gap (easiest parts to find). I
would like to keep the cost down and am currently looking for the
transformer and caps. Should I get these then go from there after
I have the voltage and amperage ratings of the transformer?
I plan to put the whole primary inside an enclosure made of aluminum and
plexiglass. The secondary will be wound on polyethelyne or PVC tubing, I
understand PVC is not as good? The coils will be mounted on top of a
plexiglass top to the aluminum box.
The two sources of information I have at this time (other than the net)
are the Tesla Coil book by George Trinkaus and a book that has the plans for the Information Unlimited coil of similar dimensions. The coil in the book
(BTC3) has the "bundled primary" I guess this is scramble wound?
Does this sound like it will work so far? What are the specs of anyone
elses successful project of similar size?
Thanks,
Chris
>
> From: D.C. Cox[SMTP:DR.RESONANCE-at-next-wave-dot-net]
> Sent: Wednesday, November 26, 1997 11:55 PM
> To: Tesla List
> Subject: Re: primary and secondary diameters
>
> To: Chris
>
> If you are building your first coil you might wish to reconsider some
> parameters. 8 guage wire is quite large and is usually reserved for coils
> operating at 8 kw or higher powers, ie, a pole transformer unit which is
> quite dangerous to the first time builder. If you are running a neon
> transformer setup what kind of spark are you aiming for? A nice 6" x 30"
> sec coil closewound with #24 AWG polythermalize (200 degree C) magnet wire
> will deliver a consistent 40-48 inch spark if equipped with a 20 x 5
> toroid.
>
> A good "rule of thumb" is to place the lowest sec winding approx 1 1/4 to 1
> 1/2 inch above the top turn of the flat spiral primary coil. The inner
> primary turn should be approx 1 1/2 inch to 1 3/4 inch from the sec
> coilform. This will allow a correct coefficient of coupling on most coil
> setups and good performance. A good practice is to use some scrap 12 AWG
> house wiring for the "test" primary and affix this to some scrap plywood as
> well. After you have your cap value and tried a number of different turns
> you can replace the primary with some neater copper tubing or flat copper
> strap (best if a large number of turns is required). The plywood can be
> laminated with Formica which makes a neat looking support.
>
> Don't forget to elevate the primary/sec coil at least 12 inches above the
> lower support so as to "decouple" the primary coil from the concrete floor
> or table-top.
>
> Hope this information is of assistance.
>
> DR.RESONANCE-at-next-wave-dot-net
>
> ----------
> > From: Tesla List <tesla-at-pupman-dot-com>
> > To: 'Tesla List' <tesla-at-poodle.pupman-dot-com>
> > Subject: primary and secondary diameters
> > Date: Tuesday, November 25, 1997 8:25 PM
> >
> >
> > From: Christopher Stone[SMTP:stone-at-etak-dot-com]
> > Sent: Tuesday, November 25, 1997 6:45 AM
> > To: tesla-at-pupman-dot-com
> > Subject: primary and secondary diameters
> >
> > Hi all,
> >
> > I am working on building my first coil and I have found information
> > that has stated that the primary should be twice the diameter of the
> > secondary and others state 3 times the diameter. Which works best?
> > I was planning on using heavy guage wire #8 or so, how much difference
> > does it make between air wound and bundled?
> >
> > Thanks,
> >
> > Chris
> >
> >
>
>
>
>