Re: Back on the list after a few years

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

Original poster: "Terry Fritz" <twftesla-at-qwest-dot-net>

Hi Rob,

I guess you know far more about that stuff than I do ;-))

You should check out the recent new work by Paul Nicholson on secondary
theory and modeling:

http://www.abelian.demon.co.uk/tssp/

Especially the paper at:

http://www.abelian.demon.co.uk/tssp/pn2511.html

He uses Linux and such to do some pretty nice scientific modeling for Tesla
coils.  I used Cygwin to run his programs under Windows but now I have a
Sun that can run it all native.

Right now we are looking at the effects of weather on secondary coils:

http://www.abelian.demon.co.uk/tssp/tcma/

http://hot-streamer-dot-com/bob/qvar/results/expt4/index.html

Its pretty neat stuff!  Paul did all the software and theory and I "try" to
keep the experiments running.  More info at:

http://www.pupman-dot-com/listarchives/2002/April/msg00039.html

Cheers,

	Terry



At 03:31 PM 4/27/2002 -0700, you wrote:
>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
>