Resonance Circuits and Resonance Systems

[Belfior]

More coil related questions:

I can find out the resonant freq of a primary, by using this method:

http://www.hvtesla.com/img/tesla%20coil%20tuning_prim.jpg

Then I can make the secondary so that it also resonates with that frequency.

Now what if I have a 15kV flyback transformer to drive the primary? How do I measure my primary to resonate to the freq that the flyback produces? Or do I just connect a cap and spark gap to the circuit and change the cap values to find the resonance? What methods can I use to find that resonance, because I can't just connect an oscilloscope to a coil that has 15kV running through it? If I use another coil, maybe just few turns, and hold it near the primary. I can see spikes, but doesn't this just show the resonant freq of the short coil that i'm holding and not the primary's resonance?

[Belfior]

HV generator to get a spark for 2$ a piece. Why buy a 50$ or even more expensive NST?

https://www.aliexpress.com/item/DC-3V-6V-bis-400kV-400000V-Boost-Step-up-Power-Module-High-Voltage-Generator/32823140457.html

https://www.youtube.com/watch?v=xISAQZSWU0I

[Belfior]

Trying to make a transistor switch this circuit automatically to get over 100V from a 6.5V DC battery.

https://www.youtube.com/watch?v=EVK84Z8BSnc

Would appreciate if someone could take a poke at this maybe with

https://www.circuitlab.com

and no I would not like to use a voltage doubler, tesla coil, joule thief or any method to raise voltage. Just an automatic switch for this solution on the video.

My current non-working idea is at https://www.circuitlab.com/circuit/szm2y68b4wqt/voltage-pump/

and yes I am not an electrician. My idea was to zap the coil to the battery negative using the transistor's collector and emitter. When they conduct base loses voltage and shuts of collector&emitter. Resulting magnetic field in the coil collapses and the energy has no place to go but the cap

[TinselKoala]

You're on the right track, sort of.

Google "disposable camera schematic", and have fun.

But be careful, you can get a powerful shock or even damage your skin.

[Belfior]

You're on the right track, sort of.

Google "disposable camera schematic", and have fun.

But be careful, you can get a powerful shock or even damage your skin.

Whaaat! No way! Maybe small resistor on the collector side also and test this by attaching a gas discharge tube and a lamp over the capacitor. This way the high voltage would ZAP to something. hopefully