ketone,
if, by "shielding effect" you mean insulation qualities, there won't be any problem.
And Kynar wire is very sturdy.

@fatbird

Thank you for the link and the warning. I think it should be on the top of priority list and I update my first comment. (UPDATE: I can not... )

@ketone

Nice one. Is that secondary thick enough?
Just joking. You don't need that thick copper, unless you are intended to weld directly from your device.

BTW, you don't have the 2 more primary coils. You will seriously suffer to make OU without them.

@Lindsay

Thank you for your positive comment as always. It also helps me to work faster as I cna get lazy very quickly..
And thanks for the useful advices to others and helping them.

Unfortunatelly I don't have cro (died a few months ago hand in hand with my PG due to another TPU experiment ).

A, what is your experience with the Northern/Southern hemisphere thing. Do the winding and polarity make a difference?

Tonight I will wind identical the other way and get this variable out of the equasion for good.
I failed to keep the other wind ..lazy me

Another thing, to make the secondary fit better , wind the think wire over something 20% smaller than your tube. then it will hold itself  snugly when you (carefully)transfer it to the main tube.

@agentgates...yes about primaries...i stopped production on it as i was considering 4 phase..and its funny you mention welding...as thats what it will be for at the factory!

Ok, then you need the 3 or 4 primary and perhaps more on the secondary. (mine gives 12V peaks for one turn, yours will give about 24V). But don't ruin that for now as when I am ready with the research with the driving side and get the spikes gently merged I am expecting rising on the output voltage. So don't glue now just give it the 2 or 3 more extra primaries first.

Watch out for copper oxide rectification which can charge the probe capacitance when driven without a load resistor.

This can give false DC effects, but may disappear at different settings of scope as impedance changes or small oxide breaks over.

Can be especially bad if a torch was used to remove the formvar (varnish) insulation

Best to solder the load resistor directly to clean copper secondary wires, then probe across the resistor.

Regards...V

@agentgates

Keep the good work , i have so say it is a pretty good design transformer , i use it on a joule thief circuit , and it works great , almost like a regular toroid .

The coupling  between the coils is great . and that even at less the 1.5 volts.

So now i am testing different things , on my first device i was getting about one volts per secondary turn now over 7v.

I am waiting on a signal gen to get into the real stuff .

Thank again !

Ps don't mind Marco he is the boss of the tpu circus . I hoped that hiding the tpu tread in the ou prize helped keeping it low profile , before all the naysayer picked up the sent of controversy .


 

Mags, I know the questions for Mk1 but I would answer some of those things I can:

And what freq are you running at?

This device is not freq sensitive. You can fire it with either a high resistance pull-down res on the FET's gate and touch the gate with your gate voltage output of the PSU.

Does that mean that the output current goes down as the voltage goes up?

Your output (both voltage and current) should depend on the diameter and length of your secondary, also the voltage you put on the primary. When you increase the primary voltage the hump is slowly growing out of your 0 voltage line and going higher and higher. After a certain level it does not make a difference whether you go above with the input because the secondary gets magnetically saturated. This is the maximum voltage you need on the input to get the maximum out of your output.

Later when you will do it with 3 primary in 120 degrees out of phase you will noticed that the increasing of input voltage also gets the spikes a bit closer each other. Approximetaly 100% increase on the input voltage decreases the pulse delay with 20% while the pulses go higher and higher.

UPDATE1

If you're using CRO please read Lindsay's message as he experienced something with it that can cause failure if you ignore.


UPDATE2

Ok Gentleman I glued the last thing on it. Hope it will be as solid as concrete and then pop the primaries on tomorrow. Now I drop a nap and will be back sometime at GMT 11AM tomorrow.

Take care and good luck until then.

Kind Regards
Tony

Tony it's a bit confusing talking about phase degrees with square waves. I assume that 120 degrees out of phase means that the next pulse starts 1/3 of the on time later?