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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