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Re: [TCML] predicting phase shift



Excuse me sir,

I urge you to build it before you continue to tell of how it does not
work.  I do not understand how you think you can carry on about how it
does not work, when you have no proof.  This would be a completely
different story if you had scope shots and videos of the circuit not
working.  As it stands now the situation is completely the opposite.
Finn has scope shots, and videos proving that the circuit works, I'm
not sure what more proof you need.

-Phillip Slawinski

On Thu, Jun 25, 2009 at 20:41, DC Cox<resonance@xxxxxxxxxxxx> wrote:
> Build it and then comment on it.
>
> Dr. Resonance
>
>
>
>
> On Thu, Jun 25, 2009 at 1:36 PM, Phillip Slawinski <pslawinski@xxxxxxxxx>wrote:
>
>> DC Cox,
>>
>> You have been rambling on about how Finn Hammer's "Hammertone
>> Predikter" does not work for the past three days.  During this time
>> you have provided no real evidence that the circuit does not work.  At
>> this point you are beginning to sound like a broken record; you keep
>> restating the same "theories" over and over.  Finn has provided plenty
>> of evidence that his circuit works.  It would appear that most of the
>> coiling community agrees with his conclusions.  I am sure others will
>> soon repeat his experiment and obtain the same results.
>>
>> I invite you to build the circuit exactly as Finn did and provide the
>> group with some real evidence that this circuit does not work.  Up to
>> this point you have proved nothing to the community except that you do
>> not understand fundamental concepts like inductance.  In the words of
>> Carl Sagan, "Extraordinary claims require extraordinary evidence."  If
>> you are going to continue to make such extraordinary claims about the
>> "Hammertone Predikter" please have the evidence to back these claims
>> up.
>>
>> -Phillip Slawinski
>>
>> On Thu, Jun 25, 2009 at 13:44, DC Cox<resonance@xxxxxxxxxxxx> wrote:
>> > Yes and no.  You do have to worry about it in the case of DRSSTC
>> circuits.
>> >
>> > In the case of a classic coil if the frequency shifts a bit as power
>> > produces thermal effects in the secondary coil, I agree, no problem.  The
>> > spark gap jitter alone produces more off resonant
>> > firings than any thermal freq shift in the sec coil as it heats up during
>> > operation.
>> >
>> > But in these DRSSTC circuits even small changes in the tank capacitance
>> > value or in the thermal effects changing the resistive component in the
>> sec
>> > coil, yes,
>> > the coil will slightly change inductance and hence frequency, especially
>> > resonant frequency.  Firing at exactly the zero crossing point is
>> critical
>> > if you don't want to heat up
>> > the IGBTs.
>> >
>> > If the primary isn't firing very close to the zero crossing point heat
>> will
>> > be produced in the IGBTs which will lead to failure.  You can NOT do it
>> will
>> > passive components.  You need an active system to track the primary and
>> sec
>> > currents.
>> >
>> > If you do a complex nodal analysis you can add in the thermal effects and
>> > then you will see the zero point shift within the time domain.
>> >
>> > Dr. Resonance
>> >
>> >
>> >
>> >
>> > On Thu, Jun 25, 2009 at 9:25 AM, <sparks@xxxxxxxxxxxxxx> wrote:
>> >
>> >> > Inductance can change with frequency.  If you measure a coil at say
>> >> > 100GHz you will get some odd readings.  But in our case at
>> >> > say 100kHz, you just don't have to worry about it.
>> >>
>> >> The inductance of an air core coil seems to change as the frequency is
>> >> varied, but this is due to errors in the measuring instruments and the
>> >> parasitic capacitance across the inductor.  Iron core coils will show
>> >> different inductance values at different frequencies because the
>> >> magnetic properties of the core are slightly different at different
>> >> frequencies.   Skin effect at high frequencies and current crowding at
>> >> high current levels will also change the apparent inductance of the
>> >> coil.  All of these effects have been well documented in the literature.
>> >>
>> >> 73,
>> >>
>> >> Ralph   W5JGV - WD2XSH/7
>> >>
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