Re: Back on the list after a few years

["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>

Thanks Terry for the welcome.  As an RF/microwave engineer, I have the
rare luxury of using Agilent ADS2002 to do large signal S-params and
general harmonic balance analysis, but PSpice is just a lot easier to
use.  One of the problems is that I have a Spice 3 macromodel for my
mosfet, and none for ADS or PSpice, so I kind of have to wing it.  ADS
tells me that there is matching to do between my step up E-core (2:10)
and the coil.  But I've tried Smith chart analysis, and the values I get
in the simulators don't work in real life.  So much for simulators.  I'm
glad you liked my web site.  FDTD is more applicable to microwave work,
but I have a prototype cylindrical coordinate program that might be
useful for at least analyzing 1/4 wave helical coils at much higher
frequencies.  Right now it just crashes.

Rob.


Tesla list wrote:
> 
> Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>
> 
> Hi Rob,
> 
> Welcome back :-)
> 
> Post to the Tesla list should be sent to:
> 
> tesla-at-pupman-dot-com
> 
> so you did it just right :-)
> 
> As you increase the voltage, the FET will tend to get hotter and hotter so
> keep an eye on it.  Although your voltage is low, it sometimes helps to put
> about a 50 ohm resistor in the gate lead to slow the FET just a little so
> high current turn ons don't hurt it, but I think you are safe in any case
> at low voltage.  Lots of people are experimenting with smaller FET coils
> these days so you should have plenty of "advice" ;-)
> 
> You EM project is really neat too!
> 
> Cheers,
> 
>         Terry
> 
> At 08:56 AM 4/27/2002 -0700, you wrote:
> >Hello everyone,
> >
> >Just wanted to make sure I got the right email address to send to.  I'm
> >working on a very small test project, 8.25" of winding on a 1.25" form.
> >Resonates at 2Mhz and is driven by 15V with an IRFP150 MosFET and UC2710
> >driver IC.  I get about 10kV :) :)  I don't think thats bad for such a
> >small voltage and such a high freq.  My driver circuit consumes more
> >current than the FET drain :)  But the FET is running very efficiently.
> >Barely gets warm.  I think I will try to bump it up to 30V today.
> >
> >It will be fun being back on the list.
> >
> >Rob N3FT
> >
> >ps. check out my personal web page.  It begs for a tesla FDTD Open
> >Source sim program with 3d view of the fields.
> >
> >
> >
> >--
> >-----------------------------
> >The Numeric Python EM Project
> >
> >www.pythonemproject-dot-com
> >

-- 
-----------------------------
The Numeric Python EM Project

www.pythonemproject-dot-com