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re: bunch of questions
Subject:
re: bunch of questions
Date:
Mon, 24 Mar 1997 08:39:34 +1200
From:
"Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization:
Wellington Polytechnic, NZ
To:
tesla-at-pupman-dot-com
Just a thought following on from Steve's post....
> > My secondary coil is almost ready and I need some info.
> > Should the secondary coil be loose coupled ?
> > What size should the primary be when my secondary is about
> > 40 inches tall and 4,4 inches in diameter.
> > I'm using 28 AWG wire and I need to know is that good size for
> > this sized coil ? It 'accidently' got little bigger that I thought.
> > How to tune the primary coil ?
>
> Your coil is too long for its diameter. You should not go over about
> 5:1 generally; you are nearly at 10:1. Also #28 is pretty thin. Most
> folks use something closer to #22.
>
> However, all is not lost! I started with a coil very similar to yours.
> The solution for me was to take a hand saw, and very carefully cut the
> coil in half so that I wound up with about 18 inches of windings. It
> was painful, but it was the right thing to do. Also, you can then use
> the left-over top half of your coil as a pair of choke coils to protect
> your transformer. I took the discarded top half, stripped a few inches
> of wire off the middle, and had two "free" choke coils - one for each
> side of my neon. I even drilled and bolted a protective spark gap to
> the choke coil form for an integrated protection system. Cut that puppy
> down!
Cutting the coil in half means you are on the way to a twin system :)
Malcolm