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Re: Pi-Wound RF Chokes
Subject: Re: Pi-Wound RF Chokes
Date: Sun, 18 May 1997 20:39:10 -0500
From: "Robert W. Stephens" <rwstephens-at-headwaters-dot-com>
To: Tesla List <tesla-at-pupman-dot-com
>
> Hi all,
>
> Say, I was browsing through an old electronics magazine just today and
> came across an article which I read back in '91 on building a small TC.
>
> Anyway, the guy who built the coil noted the use of Pi-wound chokes,
> from
> what I can remember a friend of mine describing there construction was
> as
> follows -
>
> Take a 1"x 2" piece of wooden dowell rod.
> Machine grooves at spacings of about 1/4" apart (see below)
>
>
> |<----------- 2" --------->|
> __ __ __ __ __ ___
> | | | | | | | | | | ^
> | |__| |__| |__| |__| | |
> | __ __ __ __ | 1"
> | | | | | | | | | | |
> |__| |__| |__| |__| |__| _v_
>
> | | | |
> ^^^--- 1/4" ^^^^--- 1/4"
>
>
> Then wind #30 gauge Cu magnet wire such that you fill each groove, then
> when one is full, move onto the next...
>
> Basically, it sort of gives you a series of chokes....
> This type of choke is supposively ideal for neon-transformers.
>
>
> What I'm wondering is has anyone come across this choke design before,
> have used it, or know specifically about this particular design and how
> it
> works as apposed to using a coil of wire around a piece of pipe?
>
> Thanks all,
>
> Catchya!
>
> Rod
>
Rod,
That is the design concept of my successful Stephen's Mega-Henry Brand
RF
chokes, except I use plastic, not wood. It's true, they are good
with neon transformers. I've built air core chokes this way from 140
to 500 mH.
rwstephens