Kapanadze Cousin - DALLY FREE ENERGY

[itsu]

So, how much do I owe you?

thats a good one, you are a typing goldmine to me already with this info :-)

Before the saturation, the slope of the green line is 700mA/μS (if the supply voltage (+V2) was known the green slope most like would calculate to the 173μH self-inductance of W1 that was measured before with the inductance meter).

Looking at the video at 06:34 i would say +V2 was 60V

What is surprising is that the KT926A conducts 15A current with 816mA of base current.

perhaps i should double check the base current by measuring the voltagedrop across the base resistor.

The bad news is that this 800ns saturation time is too long for the forward pumping of the DSR diode. In order to shorten the saturation time for this core, you must increase +V2 or increase the W1 turns.

So with this info i could try the other new toroids to check if they behave any better.

Regards Itsu

[verpies]

Looking at the video at 06:34 i would say +V2 was 60V

If that was the +V₂ at 6m24s then L=V*dt/di and this calculates to 60V * 1μs/700mA = 86nH.

perhaps i should double check the base current by measuring the voltage drop across the base resistor.

You could.

So with this info i could try the other new toroids to check if they behave any better.

Why not?
Pay attention to the current at which the saturation happens (the blue point), and to how abruptly the core saturates (e.g. by comparing the ratio of slopes. See the slopes of green and blue lines in this scopeshot) 
You'd get more accurate results with the MOSFET because it has more square switching characteristic with the 4.7Ω gate resistors.

Also, remember that the time to saturate the core must be equal to half of the self-oscillation period of the LC circuit composed out of  W2 and C2 (without the DSR Diode).
That's two variables to coordinate.

...unfortunately there is also a 3rd variable, namely the lifetime of the DSR Diode carriers (the Belkin Document calls it t_zh).  This lifetime must be approximately 10x longer than the core saturation time.

[verpies]

@Itsu
I know that the grounds of your scope probes are not isolated from each other and that creates some difficulties.

It would help if you could trigger your scope from the 74HCT02 (U3) by connecting the tip of the probe to pin 8 of U3 through a 2.2pF capacitor in series (the capacitor should be capable of withstanding at least 200V)
This way you can have the ground clip connected to +V₂ in order to e.g.: measure the voltage drop across the CSR which is located near the +V₂ supply rail (e.g.: 150V).

P.S.
Another way of accomplishing the same thing is winding a 1:1 isolation transformer with many turns of very thin wire where each winding is spanning only half of the core and not touching the other (more work, but more elegant).
Also, if you'd like to see the total current flowing in the primary (including the current conducted by the Flyback Diode) then you would try moving the CSR as shown below.

[itsu]

@Itsu
I know that the grounds of your scope probes are not isolated from each other and that creates some difficulties.

I know, i have seen the sparks :-)

It would help if you could trigger your scope from the 74HCT02 (U3) by connecting the tip of the probe to pin 8 of U3 through a 2.2pF capacitor in series (the capacitor should be capable of withstanding at least 200V)
This way you can have the ground clip connected to +V₂ in order to e.g.: measure the voltage drop across the CSR which is located near the +V₂ supply rail (e.g.: 150V).

You mean using the "external triggering" functionality (probe) of the scope?

P.S.

Also, if you'd like to see the total current flowing in the primary (including the current conducted by the Flyback Diode) then you would try moving the CSR as shown below.

I can do that, but would be using my 1 Ohm resistor instead.

Refards Itsu

[verpies]

It would help if you could trigger your scope from the 74HCT02 (U3) by connecting the tip of the probe to pin 8 of U3 through a 2.2pF capacitor in series (the capacitor should be capable of withstanding at least 200V)
This way you can have the ground clip connected to +V₂ in order to e.g.: measure the voltage drop across the CSR which is located near the +V₂ supply rail (e.g.: 150V).

You mean using the "external triggering" functionality (probe) of the scope?

You could do that, but you can still use Ch2 as the trigger source -  this way you will see the signal at pin 8, that you are triggering on, and you will not need a 3rd BNC cable.

P.S.
Of course do not use the 0.1Ω inductive resistor... but try to obtain some non-inductive carbon ones in the future.