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Re: Insulation on Primary windings (fwd)
---------- Forwarded message ----------
Date: Sat, 14 Feb 1998 12:21:22 EST
From: FutureT-at-aol-dot-com
To: tesla-at-pupman-dot-com
Subject: Re: Insulation on Primary windings (fwd)
In a message dated 98-02-14 02:48:57 EST, you write:
<<
> Hi All,
> Say, I'm designing a new small coil and am deciding on what type of
> conductor to use for the primary.
> I'm building a 3"x12" coil and am looking at a conductor diameter (for
> the primary) of 0.125". I could go for copper pipe, or I was thinking
> standard 30Amp Earth wire (which is about the same diameter).
> Refering to my subject line, Insulation on the primary, why is it, that
> for every coil I've seen (from miniature to huge), the primary windings
> *never* have any insulation... why is this so?
Rod,
I usually use insulated wire on my primaries. The disadvantage of the
insulation is it makes it hard to tap the coil for tuning purposes. I often
use stranded wire and stick a sewing needle into the wire to find the best
tune point, then when the best tune point is found, I strip away some of
the insulation from that point and connect a clip lead, etc. Some people
use insulated wire for the inner part of the primary, and bare wire for the
outer part of the primary to solve the tuning problem. The needle method
cannot be used in a high powered coil because it will heat up and melt
from the high current.
John Freau
> Therefore, I was thinking that I might leave the insulation on the
> Earth wire that I'll use on the primary... good idea?
> Weird thought I know, rather trivial, but it's something I've not thought
> about before...
> Thanks!
> Catchya!
> Rod
>>