3v OU Flashlight

[TinselKoala]

The mosfet/bipolar transistor does not produce the sine wave in the Akula circuit and it does not function by loading down the positive rail. The sinus is produced by the burst oscillations, not the other way around. It has nothing to do with the transistor other than providing a gate/base signal thru the inverter. The proof of this is that the sinus and burst oscillations occur even when the transistor/mosfet is not switching at all, as you can see from my scopeshots and even from Itsu's first shot.

[Vortex1]

The mosfet/bipolar transistor does not produce the sine wave in the Akula circuit and it does not function by loading down the positive rail. The sinus is produced by the burst oscillations, not the other way around. It has nothing to do with the transistor other than providing a gate/base signal thru the inverter. The proof of this is that the sinus and burst oscillations occur even when the transistor/mosfet is not switching at all, as you can see from my scopeshots and even from Itsu's first shot.

Yes, I can agree with that, the bursts load the supply causing the ripple sine. Either that or the sine is superimposed on C5 by the output of W2.

  But lets get to the meat of the question from the first line i.e. the rationale for using a scratched out portion of a schematic from the video. Also, what is the proposed utility of the FET and load resistor R3?

Note also that in the diagram in question C5 effectively shorts the output of winding #2 at high frequencies, creating quite a stress on the driver transistor in the chip and further reducing efficiency. It is a good thing there is current limiting in that 34063 chip.

Would anyone agree that most of the other Akula designs utilize the mixing of two frequencies in the transformer, or at least a variable bias to the core in one of the windings?

Of course I understand that there is no obligation for you or anyone to answer, I am presenting these questions respectfully as they have troubled me.

[verpies]

But lets get to the meat of the question from the first line i.e. the rationale for using a scratched out portion of a schematic from the video.

Since you insist...
The only reason, that I am aware of, for using the scratched out circuit from the Akula's video is that it is the most recent chronologically.

[hartiberlin]

Yes, Vortex1,
try mixing 2 frequencies at 3:1 ratio in the core,
as this will add up the amplitude, if they are in phase and gets nonlinear mixing, due to core saturation
nonlinearity.

Then try to use the frequencies that also ring your ferrite core and see, if you
can extract from this mechanical ringing matched to the LC resonance
with these 2 frequencies, where one frequency is an overtone or lower harmonic and the other is the exact
mechanical ringing frequency,
some good extraction of energy.

Many thanks.
Regards, Stefan.

[verpies]

JUST IN CASE the answer to the following question is "No", use a springy (non dampening) spacer between the potcore halves.

Q: "A magnet is pulled out of a shorted superconducting aircoil.  Does the final current induced in that coil depend on how quickly the magnet is pulled out ?".