Kapanadze Cousin - DALLY FREE ENERGY

[John.K1]

This is actually good question- How can you sustain the resonance when capacitance and inductance change.  Yes, the frequency will change- but it will be still  "Resonant" frequency.

This is quite interesting task, as the self resonance can be changed by only the change of capacitance of the cap in LC circuit or by inductance of coil.   My question  is- is inductance proportional to saturation of core?

If yes, we can just change the amount of current passing trough the yoke.  Or ,what is your opinion how to keep a system in resonance what ever happens?

[NickZ]

  Verpies:
  I think that what Tom means is that, Itsu's TL 494 driver board worked as expected in being able to control the device to run at the desired frequency. But there was no additional gain observed at the hoped for resonance points, or matching Kacher's frequency sync.  And therefore, no expected effect, noticed at the bulbs.   
Perhaps is what he wanted to say?

   John: I would try to first obtain resonance, sufficiently tuned to observe the "effect". Then, see about how to keep it the frequency from wandering. 
   Even a slight movement of ferrite pieces inside of the grenade former tube, is normally enough to adjust for any wanderings. Also a magnet in the yoke will further adjust, and tune both the frequency, and the amplitude. No burnt out sensitive component, either.
  As up to now no one has been able to make their observe "effects", if any, produce a self running device. Why be concerned about maintaining the resonance points steady, if you haven't observe any effect of the sync, in the first place. 

[Void]

Or ,what is your opinion how to keep a system in resonance what ever happens?

One way to monitor the resonant frequency point of the yoke secondary loop would be to have a
current transformer (CT) in the yoke secondary loop. The voltage on the output of this current transformer
would be representative of the current amplitude in the yoke secondary loop. At resonance in this (series L-C-L) loop, the
current will be at its maximum in this loop.

So you need some sort of circuit arrangement that will constantly adjust the PWM frequency to always
keep the current in the yoke secondary loop at its maximum. How to implement that using the PWM drivers
that many people are using I don't know, but someone here may be able to design a circuit to do that using
the TL494 or some other PWM chip.

[NickZ]

  Perhaps Mag's driver controllers can adjust both frequency and duty cycle. As the TL 494 IC can't do both, at least not by itself, nor will the commercial TL board serve both purposes. As that TL 494 board is not a true PWM. Only provides a steady 40% duty cycle, on both sides.  But, it may be a good starting point, even at 40%. Worth a try, maybe...
 

[verpies]

One way to monitor the resonant frequency point of the yoke secondary loop would be to have a
current transformer (CT) in the yoke secondary loop.

Yes, a current monitoring device, such as a CT or CSR in the LC circuit where resonance is to be tracked and maintained, is sufficient for a PLL to lock onto the i/v phase of the LC circuit.

Itsu has used a CSR in his version of the LC resonance tracking with PLL.  ...and I am not referring to his videos with the TL494 PWM board/chip.
PWM adjusts the amplitude of the LC oscillation through the modulation of the pulse width and the PLL tracks the LC resonance frequency throgh i/v phase feedback.  Both chips mate quite easily.