Ok, CRT transformer is fine. If the starts and finishes are correct, the transistor will see positive feedback in the base, and it WILL oscillate.
The turns... I seem to have created confusion with my slack winding practices.
It has two primaries. Both the same turns number. I use 18-24 depends on what wire I have on hand... why?
Simple, I like to wind the first layer so that it runs from one end of the former to the other, close wound... just to keep the layer neat and clean...... but it would take 40 odd turns to achieve a full layer..... so I wind two in hand, and so wind both primaries together. This gives us close coupling, a single flat layer, and I only need to count once, and the starts and finishes are obvious.... so thats why I do it....... I'm a lazy slob.
The secondary is as many turns as you can fit on, but less than 600, or the reactance may well current limit the output, and is a waste of wire to go more.
David.
The free wheel diodes need to be as big as you can get in there.
EDIT: That should be 1000v not 100v.........6A10 are 1000v diodes
I use 6a10 100v 10A diodes X2. They are only 10A but surge is about 800A combined... and on a larger system, should use more or bigger.
Primary of transformer is 24 and 24 ( or 18 and 18 etc) as on the circuit, not as in the inset (24, and 10)
R4,R5,R6 1/2W
R1 2k2 R2 640 1w for lower power systems, with bigger transistors for more drive 2W.
Both resistors are very flexible. Want faster charging for larger UF caps, then , go to lower values and bigger transistor..........to lower the power in the circuit and keep the charge rate at 1 second or more for low UF systems, then higher values or smaller transistors.
Toroid..... any toroid from the outputs of the computer power supplies would do. They are materials suited to this purpose, and are freely available.
Size... don't really know, about 32mm outer, 12mm width,and 20mm hole... just a guess from here. They are out in the shed, but just grab em from computer supplies. They are not critical in any way.
The etd49/39 (maybe etd29 may be a bit small for 30uf systems and above), can be any thing you can scavenge from tv sets power pwm cores, or computer monitors etc, or even as Madlabs has done, the old eht cores from older tellies.
There is nothing critical in any of this except to get the starts and finishes of the little oscillator correct, if so,it should run.... amplifier+ pos feedback=oscillator
The diacs.. no markings, but from memory, about 30 odd volts step off/ avalanche. I bought 100 for $2 inc shipping from your country.
Step off voltage is of no concern if yours are different, as we just need to change the sense circuit (the 3 1m resistors) to suit the the diac... they are the divider after all.
D1 is just a diode to protect from reverse leads.. a 1A diode of anything over 30v will do.
R4-8 and C4 are your sort of timing components. They give you a delayed reaction of what is actually happening with the capacitor V, as well as determining when the step off of the diac occurs. C4 provides a load for the divider to work into, and stops spikes triggering prematurely, R4,5,6 and 7 provide the divider, and R8 some fine control.
....................oztules