Re: [TCML] predicting phase shift

[DC Cox <resonance@xxxxxxxxxxxx>]

That is correct. I talked to Bylund on the phone in the 80's.  He started
working with MOSFET coil experiments not long after he got out of the Navy.
First circuits in 78 thru 81 years.  Then, published a bit later.

Dr. Resonance




On Wed, Jun 24, 2009 at 6:58 PM, piranha <piranha@xxxxxxxxxx> wrote:

> Hi,
>
> Just for the record...
>
> 'Modern Tesla Coil Theory' by Duane A. Bylund was published in 1990.  "This
> book had its beginnings when I made my solid state Tesla coil with AFC in
> early 1989..."  "My first transistor Tesla coil was developed from a 200W
> switching power supply out of an IBM AT computer".
>
> His solid state coil is SG3524 based  with a Current Transformer on the
> secondary base that was filtered and drove a VCO to the power amp.  Oddly,
> he drives the secondary directly at the base without a primary coil.  Quite
> conventional though.  His earlier tube coils were more sophisticated with
> variable inductor load matching and such.
>
> Terry
>
>
>
> DC Cox wrote:
>
>> 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
>>>>
>>>>
>>>  _______________________________________________
>>> Tesla mailing list
>>> Tesla@xxxxxxxxxxxxxx
>>> http://www.pupman.com/mailman/listinfo/tesla
>>>
>>>
>>>
>> _______________________________________________
>> Tesla mailing list
>> Tesla@xxxxxxxxxxxxxx
>> http://www.pupman.com/mailman/listinfo/tesla
>>
>>
>>
>>
>
> _______________________________________________
> Tesla mailing list
> Tesla@xxxxxxxxxxxxxx
> http://www.pupman.com/mailman/listinfo/tesla
>
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla