Kapanadze Cousin - DALLY FREE ENERGY

[verpies]

@Verpies; re Itsu's back ringing, the toroid is unloaded, and the other winding open, the field generated there is collapsing back into the primary more than the resistor and other inductances are playing a factor...

The ringing is obvious and to be expected, however the open T1's secondary plays no role in those oscillations because there is no current flowing in it (might as well not be there at all).
I already wrote that the LC tank is formed by the inductance of the primary, the 1nF capacitor, 1kΩ resistor snubber and the CSR.
These LC oscillations occur mainly after the MOSFET stops conducting and do not perturb the measurement of the core's saturation point, which happens during the offâ†'on transition.

Well since no one posted, I can continue...

No one posted because they were sleeping in different time zones!

[d3x0r]

{Ya nevermind I didn't say anything useful}

[verpies]

is there a huge difference between FJL4315OTU-ND and the KT926?

there appears to be a difference in the base-collector capacitance.

I have a tunable 50ns-anything higher pulse from the logic chips, but that translates into an on time of 2us for the FJL4315... I've tried changing the cap and resistor on the gate, but it's always the same...

The FJL4315 transistor does not have a gate.
Apparently you have no problems turning it on quickly yet you have problems turning it off quickly.
You need much more base pull-down current in order to discharge its C_B-C and stop it conducting quickly.

Last night, I was playing with the tuning of the TL494 oscillator, and put a large resistor[from high voltage source to ground] (100k) started with smaller ones (4.7k) but nearly burned it up when I got the primary tuned... the load matters a lot in tuning the primary; but I had a very nice square wave which yields the most power, but it's wasn't best for high voltage...

Did that square wave represented voltage or current in your primary windings?

I cannot advise you without seeing the current waveform in the primary of T2, first.  Last time you couldn't get a clear picture of it because of inductive CSRs.

It seems as insufficient power is transfered from the primaries to the secondaries of T2, most likely because of too few primary turns (resulting in insufficient primary inductance).

Subsequently, multiple insufficient power issues follow throughout the rest of your circuit.

[d3x0r]

there appears to be a difference in the base-collector capacitance.
The FJL4315 transistor does not have a gate.
You need much more current to charge its C_B-C
Did that square wave represented voltage or current in your primary windings?

I cannot advise you without seeing the current waveform in the primary of T2, first.  Last time you couldn't get a clear picture of it because of inductive CSRs.

It seems as insufficient power is transfered in T2 from the primaries to the secondaries., most likely due to too few primary turns.

It is a measure from collector to emitter of one E13009.  They run very cool in this state.


http://youtu.be/W3aiAaEBg0s


At the top, there is something that shorts or something, that it pops, and recharge a bit. So the wave goes non-square... which is what happens as you start to recharge.... if you drop the frequency, you will get a square again, and as the voltage climbs you can keep the square there by turning up the frequency...

[Vasiliy Buslaev]

Hi guys.

verpies: Apparently you have no problems turning it on quickly yet you have problems turning it off quickly.
You need much more base pull-down current in order to discharge its CB-C and stop it conducting quickly.

Yes!
   
Transistor KT926 is a specially-made pulse transistor.
Tomorrow I will try to lay out a table of reference book. The most important thing to pay attention to on / off time of the transistor.
This is the starting point for the selection of replacement.

Regards
Vasiliy