I didn't scoop anyone, nor claim to. I started building TCs back in 1961
and worked with MOSFET coils, pioneered by Dwayne Byland (also never
mentioned or credited on this list), back in 1981. Byland started working
with them in 1978 but I'm sure Hammer never heard of him either because
there was not an internet back then, and Byland did publish, only one book,
but it has actual MOSFET circuits in the book --- published over 30 years
ago! IGBTs have been around since they first engineered in 1979, and were
first introduced in 1985 by a Japanese company.
Since we are a commercial company we don't publish everything just as IBM or
Intel doesn't. Just call IBM or Intel and ask them for a schematic diagram
of a motherboard and see what happens.
AC circuits typically use iron core inductors and their inductance changes
very little, but RF transformers without iron cores are a different beast
entirely. If you do a simple calculation,
dI/dt vs. inductance you will see inductance changes with the rate change of
current in a RF transformer. RF transformers do change inductance with
changing current, AC transformers do not.
This is basic EE not rocket science.
As for Hammer's comments, he mentioned it was open to criticism. Then, when
I try to help him, by suggesting accurately that his overshoot problem is
caused by a gate transformer turns ratio he goes off on me. Frankly, I was
stunned to realize he doesn't know inductance of an air core inductor
changes with rate change of current.
My purpose on coming on the list is to try to share my experience and help
people, not constantly argue with them. It seems jealousy lurks everywhere
and anytime someone makes a positive suggestion he is actively attacked, and
usually by someone who doesn't know what they are talking about.
Now I know why professional engineers from Intel, IBM, etc., generally do
not participate in email lists.
Moderator ---- time to end this thread as it is going nowhere fast and
serves no valid purpose on this list.
Dr. Resonance
here to help, but definitely not to spend countless hours typing in defense
of my advice.
On Wed, Jun 24, 2009 at 4:46 AM, Lau, Gary <Gary.Lau@xxxxxx> wrote:
Inductance changes as the current through it changes? I don't think I've
ever heard that before. As most inductors are used in AC circuits and the
currents are constantly changing, that would be basically all inductor all
the time. Please clarify?
Judging by the video footage that Finn provided of his predictor operating
in a coil, I believe that he did try it. Exactly what did you do 7 years
ago that scooped all other DRSSTC pioneers?
Gary Lau
MA, USA
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On
Behalf Of DC Cox
Sent: Wednesday, June 24, 2009 12:23 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] predicting phase shift
Any time the current is changing dynamically the inductance also changes
--- it pure physics and basic E.E., not smoke and mirrors.
Dan McCauley addressed some of these concerns in his book on Modern
DRSSTCs
which he wrote about 3 years ago.
You will see the light when you try it. Been there, done that, about 7
years ago.
D.C. Cox
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