Ok so this is the scenario

Capacitor 10nf coil 2,8mh resistance 33ohm resonance 30khz wavelength 2,5cm half wave reactance 527

Coil 360turns bifilar 1amp causes 33w power loss this is not copper

This voltage is only the resonant voltage

Quality factor will be lower than 10 probably because the electrodes act as a short too

I’m hoping that can increase the field near the electrode but is just a feeling

If we need this to be series resonance to the input we need the input circuit to have the remaining inductance since the

Bifilar cancel out most of the inductance and so you are charging the capacitor

That mean that for correcting the timing the input inductance the Vic I mean must have that specific inductance and so

Applying 33v should give 1 amp in series resonance if we would exclude waters resistance and the other coil

So my educated guess is that it will be charged with high voltage instead

The equivalent voltage you need to apply is that of the resonance you wanted and this is why thT value is important now

The voltage is a indicator of the fields when across the coil only

So the secondary can have maybe 2000v for full power

I have 45 turns primary coil that makes my 900 turns coil perfect for the task 20:1

And I can go little higher and put 150v to the primary

The coils will fry ?

Certainly haha

But the idea is that it can get a good test

The idea is to try to first zero in the current with the cell when driving the circuit without the cell in series

Driving only the resonance by other means like making a few turns and drive it in series while leaving the rest of the circuit connected

So we can add resistor inductor whatever needed

With that will be possible to go and check the ultrasonic for any feedback

Luckily my cell can be tuned but probably that frequency will be somewhat too high and so the wave length incompatible with the size of my electrodeszzz

Hope you get the idea