Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

Hi Verpies. What is the proper type of winding to reduce leakage inductance?

Spanning the entire circumference of the toroidal core in even number of layers in forward&back circumferential directions. 
The same toroidal winding direction of all layers.

P.S.
There is also a way to do it in one layer, but it is difficult to describe it with words without drawing.  Anyway the name of the game is to span the entire circumference of the core and cancel any circumferential current.

[Void]

Spanning the entire circumference of the toroidal core in even number of layers in forward&back circumferential directions. 
The same toroidal winding direction of all layers.
P.S.
There is also a way to do it in one layer, but it is difficult to describe it with words without drawing.

Thanks Verpies. Just to be sure I understand correctly, do you mean that for the purposes of reducing
leakage inductance, it is always better to use the whole toroid for windings than to wind multiple layers
on just one side of a toroid for a particular winding? If it is a short winding, then we should just leave more
space between each turn to make use of the entire toroid circumference?

[itsu]

The drain to source capacitance is more that 2pF.  The additional inter-turn capacitance would make it even higher.
But it is not the ~60μH that is ringing with this capacitance.  It is the much smaller leakage inductance which forms an LC tank with this capacitance.  The leakage inductance should be measured with the secondaries shorted.

So with these numbers the LC resonance of the leakage inductance seems plausible.
Good. That confirms that the 14MHz ringing comes from the drain circuit.

However that does not explain the 35.25MHz peak and the 9.416MHz peak with its harmonics.
Please repeat this test with a 100pF capacitor and note whether these peaks are also affected.
This means that the magnet forces the alternating magnetic flux out of the core, because the core forms a circular magnetic path and affecting any part of it would affect the inductance of both windings equally.

I used a 100pF cap between drain and source while having 4 stacked magnets halfway this drains primary.

First sreenshot shows the peaks without the 100pF cap in place,
second screenshot is with the 100pF cap in place.

So the oscillations are being tempered/dampend by this cap.

An annoying fact is that during these oscillations, i frequently lose the mouse of my (3m away) PC, so making a screenshot is difficult and i need to unplug/replug the mouse USB plug to get it back.

Itsu

[Void]

An annoying fact is that during these oscillations, i frequently loss the mouse of my (3m away) PC, so making a screenshot is difficult and i need to unplug/replug the mouse USB plug to get it back.

Hi Itsu. I have seen a problem like that before as well with USB devices. A couple of
years ago I was testing some circuit setup, and every time I was set to some particular HF frequency
range it was making my mouse freeze up on my computer. Computer USB devices seem to be very sensitive to
EM radiation in certain HF frequency ranges.

[verpies]

I used a 100pF cap between drain and source while having 4 stacked magnets halfway this drains primary.
So the oscillations are being tempered/dampened by this cap.

It's my fault for being ambiguous.  I meant for this cap to be across the drain and the V_CC of the primarys' windings center-tap.

An annoying fact is that during these oscillations, i frequently lose the mouse of my (3m away) PC, so making a screenshot is difficult and i need to unplug/replug the mouse USB plug to get it back.

Is the USB cable unshielded?