TopRuslan

[apecore]

At 1.4MHz now, I'd bet if half of your coil had some spacing, you
would bring the frequency up pretty close to 2 MHz.

I' ve must have mistaken in assuming it did 1.4Mhz in 1.0mm copper.
The 0.5mm version with 0.25mm pitch is with 37.5meter connected to the antenna running at 1.14Mhz

If we need to keep hold on the 37.5meter wirelength for secundairy i have to split the coil in 2.

[NickZ]

   Ape:
   The 1.14MHz may be a good starting point.I would check the Akula self runner and compare his Tesla secondary coil in length, also.I had to make a salad out of my Kacher's secondary coil, adding or removing turns to tune it, and finally obtained up to 1 cm streamers, 10.000 volt. But I think that 1/2 that voltage is enough.Remember once the Kacher is on and working, there will be HV everywhere, (microcontrolers...), PP circuit, etc.
I found that putting a diode on the ground line, turns it to smoke. Even two or three of them. You may have different results.
Grolsch, my favorite...
  You can see my current transformer to tune the output of the Kacher to the induction circuits with, next to the red WIMA capacitor.The toroid with some wire turns on it and a resistor on it, also.
   NickZ

[apecore]

NickZ,

I' m not trying to replicate again an regular type of setup as I did years ago.
Now I' m gonna try a different roadmap.

Even thinking to eliminate the yoke as it is not possible to get those narrow unipolair pulses of max 250ns at inductor coil.
The idea is also as Dog- one is explaining to get a standingwave in grenade @2Mhz .. by kacher and by hammering it at a lower frequency with a half wave 2Mhz positive puls.
Current from kacher should flow in at the high d(v)/d(t) timing.... displacement current ( like charging a cap)

So forget about inductorloop,... lower kacher frequency...

[apecore]

Short update results inductor pulsing till now.

Hooked it up as attached   (1st attempt)
Inductor pulsing, see attached schematic Ruslan...with inductor 18.75m(3 layers) pulsing it with 12 to 50V i burned a mosfet protection..( overvoltage drain-source)
The puls was 600ns by increasing the puls voltage smoke appeared ... so i disconected pushpull and yoke and start to use single mosfet high side negative voltage switching directly at the inductor (diode's and cap to recycle half wave for unipolair result installed)....

2nd attempt gave max 400ns only with 12.5m  inductor....two layer type. In 20- 50khz range.
My conclusion is that the only option is to get narrow puls is to lower the wirelength in order to decrease induction.
No 250ns with regular inductor config.

But i still need to ad the yoke again..... need to make some scopeshots and do some readings what happent. Imagine some oscilations were occuring?

Next time single puls and probe?

Maybe we have to try in push or pull mode.... one bang ... we can choose which one.

Conclusion, Ruslan may had some ideas but reality was else. Now how can we make it work?
I will install old kacher secundairy again so to have that part working...... how to deal with the new secundairy.. maybe thicker fishwire?

Tomorrow i continue and will repeate the 1st attempt testing.


Food for thought,. when no options left i consider to make grenade with 1Mhz Fres.

All issues wil disapear, ...mayor change is that we dont have a low inductance grenade at 1Mhz.
But was Ruslan's grenade not 240uH?

[NickZ]

   Ape:
  I understand. As I saw the Top Ruslan thread,  I jumped right in, sorry about that. And, good luck with your new "road map".
But, as I really am interested in continuing to unravel this project, I will butt out, for now.   Seams like the more I post, the worse it gets..   If you change your mind, or get tired of the wild goose chase, let me know.
   NickZ