Kapanadze Cousin - DALLY FREE ENERGY

[Black_Bird]

@itsu

Please don't be mad at me for the next question:

Could this be a frequency reading error? Because if the frequency was 172Khz instead of 1720 KHz, then your toroid inductance would be 85uH, similar to Hoppy's.

[itsu]

@itsu

Could this be a frequency reading error?

Hi Black_bird,  no i really do not think so, i know this little FG very well, and i know it accurately displays the frequency.

Regards Itsu

[T-1000]

Please write some more about the Magnetostriction resonance. First of all, is it a mechanical resonance caused my the mechanical vibration of the core that is expanding and contracting under magnetostriction?

Also, what do you think about the Hysteresis Losses of the ferrite core, as a source of heating?

http://en.wikipedia.org/wiki/Magnetostriction , it is purely mechanical action on atoms level. Magnetostriction resonance - sorry, that was my quick non conventional definition, in other words meaning maximum amplitude in expansion and compression of ferromagnetic material (very close to mechanical resonance). You can cause heating easily while rubbing  occur between magnetic domains of ferrite.

[Hoppy]

Eddy currents are proportional to the average current flowing in the primary and that current is very low because of the <1% duty cycle.
Also eddy currents require conductive core and ferrite in not very conductive.
The conclusion is that resistive heating of the winding or heating the core via Eddy currents will not accomplish that amount of heating as is claimed.

Please write some more about the Magnetostriction resonance. First of all, is it a mechanical resonance caused my the mechanical vibration of the core that is expanding and contracting under magnetostriction?

Also, what do you think about the Hysteresis Losses of the ferrite core, as a source of heating?

Here is an interesting paper on magnetostriction in ferrite cores. It talks about the operating frequency range of magnetostriction vibrators being between 15 and 100KHz, with the most typical frequency being 28KHz. This falls nicely in line with the nano VCO frequency that I have found to be optimum for good wave shape. Apparently ferrite vibrators are best for stability. I'm not sure how this might help us to progress but its food for thought.

Regards
Hoppy

[verpies]

Toroid resonance measurements redone with direct connected FG via 2.2KOhm and a 4.7 (5)nF and 10nF cap (probe set to 1:10 as it is always with me):
12t   10nF 1720Khz
12t  4.7nF 2430Khz
6t   10nF 2510Khz
6t  4.7nF 3620Khz   
which is almost identical with yesterdays measurements using an inductively coupled FG.

I can't see anything wrong with your measurement procedure, but the inductance ratio is still wrong between the 6t and 12t windings.

The only shortcoming of your setup is the fact, that your windings do not cover the whole circumference of the toroid and because of this, the flux might be leaking outside of the core (especially if the core has low permeability).

Try to make a winding that covers the whole circumference of the core and if you want to be neat - compensate for circumferential current, as shown in Fig.4 or Fig.5 or Fig.6 here.

Then, make another full winding with twice as many turns and see if the inductance quadruples.

If that does not help, I will have to invite Point99 to this thread.