Re: transformer fed magnifier vs. coupled coil feed

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>" <rob-at-pythonemproject-dot-com>

Tesla list wrote:
> 
> Original poster: "rob by way of Terry Fritz <twftesla-at-qwest-dot-net>"
<rob-at-pythonemproject-dot-com>
> 
> I finally got the time to try out a coupled coil feed to my small FET
> driven magnifier coil.  Compared to the ferrite transformer bottom feed,
> there doesn't seem to be much difference in the output.  I tried a few
> variants on # primary turns.  There may be a difference in efficiency,
> though, although I didn't explore that very much.  I was mainly looking
> at how long the streamers were.
> 
> My next experiment is going to be to put that big ferrite rod back in
> the center of the coil and see if I can finally find the resonant freq.
> Will be sort of like a cylindrical flyback :)  Late night fun!
> 
> Rob.
> 
> --
> -----------------------------
> The Numeric Python EM Project
> 
> www.pythonemproject-dot-com


I finally got resonance with a ferrite loaded coil.  I had to use a
4700pf cap on my TLC555 instead of the usual 150pF.  It put out less
voltage but much more current.  I was using a primary coil connected to
the FET.  I think if I can reduce the primary winding, I might get a
much higher secondary voltage.  Right now it is too highly coupled. 
Rob.
-- 
-----------------------------
The Numeric Python EM Project

www.pythonemproject-dot-com