If I look at the pictures, the back emf from the magnetic event should be stored in a capacitor for around 3/4 of the phase, and than be released into the next coil. Than the next B emf can be stored into the capacitor again, and so on.

The magnetic event of the first coil creates a resonant sine in the next coil.
The dielectric back emf stored in the capacitor creates a resonant sine in the second coil, adding both energies due to the resonances being in phase.

In the picture you see the magnetic events. The back emf at point A should be stored into a capacitor, and discharged at point B, to make an in phase resonant sine, that adds up ot the already there, magnetic resonant sine

If I imagine, the sound of the rhythm I hear a heart beat.

yesterday I watched a youtube interview of eric dollard where he talked about music.
about harmonics, and about phase locking.
if 2 waves become close in phase, they phase lock. this is a natural phenomenon that can be seen in several things, for example a swing clock.2 or more clocks will sychronise their swinging masses.

when i tuned the output coil, it detuned the center coil. this will not happen if the resonance of the center coil becomes powerfull. then the output coil will follow the center coil. if the output coil is then tuned to the rrsoant frequency of the center coil, the center coil wont detune, because the resonance is powerfull. and it will tranfer this power onto the output coil.

last night I thught about the phase angle.
where to inject the capacitor into the resonant coil.

Since the resonant sine is a voltage and not representative of the current, I dont know where the current sine is in phase relation to the voltage sine.
I think its in phase. but i simply dont know.

but for power, there is a 90 degree phase shift between voltage and current sine.

the article that Matt shared showed a 3/4 phase angle on the magnetic sine.
I think this is a good clue.
but since the current and voltage are 1/4 phase angle separated, the capacitor should be discharged at 1/2 phase angle.

this can be done by using a pulse into a 1:1 ring torroid transformer. with a duty cycle of 50%
the pulse gives a back emf in the secondary. but it also gives a small pulse when the voltage turns on. this is the quick signal to be fed into a transistor to shortly discharge the capacitor.

the phase angle can be further manipulated by changing the duty cycle.

the 1:1 torroid is only to make pulses for switching the transistors, that control the capacitor(s).

I still need another (bifilar pancake with added ferrite) to create the back emf from the 50% duty pulse. it needs enough current and voltage, and it should NOT be switched by the igbt due to the protection diode.
So I will use a transistor tip31.

the igbt can be used for switching the back emf capacitor in and out of the resonant coil. the igbt gets it signal from the 1:1 torroid secondary.

the pulse generator connects to the torroid, and should be fed by a transistor (other tip31).
the pulse generator also should switch the hugh inductance back emf coil

2 or 3 transistors needed.
p gen drives 2 gates of 2 transistors. maybe it needs a driver, or...
could the ring toroid and pancake coil be switched by one transistor?

carc is connected to emittor. that transistor gets the discharge of the capacitor from collector to emitter. Needs to be cooled (if it can handle it).

seems nelson last heating vids, has a transistor under the board (where al the wires lead.

Tesla's bi-filiar coil is very interesting. Normally a coil produces a leading voltage and a lagging current because the coil's own self-inductance induces a Cemf which opposes the flow of current. The opposition to current flow or impedance is the sole reason the voltage rises prematurely and if there was no impedance/resistance as in a superconducting loop then there is no measurable voltage present.

Now if self-inductance impedes current flow producing a leading voltage and a capacitance produces a lagging voltage then merging the two must produce neither a leading nor lagging voltage with respect to current flow. However we could ask to what end?, time is the answer in my opinion because if you want to build a large coil which stores a massive amount of energy within a very small time frame inductance and the induced Cemf become a real issue.

Thus we can see integrating a real capacitance into the coil per unit length is not like a parallel capacitance nor is it like a series capacitance. The bifiliar coil in itself will accept and store massive amounts of electrical energy with little or no impedance. Once again we could ask to what end and Tesla gave us the answer in my opinion and he called it natural-resonance. Tesla described singular components such as a bifiliar coil which had the ability to resonate within themselves outside the context of the external circuit nor were they limited by the external circuit, wheels within wheels.

thanks Onepower for your contribution.
what you say makes sense.
impedance is equal to the wire resistance when every thing is in phase.

the coil can store a lot of energy.
but not only inside. the sine can be seen in metal objects around the coil that are not connected, when probed.
so the resonant energy is also around the coil. and it can induce resonance into other nearby coils.

but how to use it? what can we do with that stored energy inside the coil while it is resonating at the same time?

have you any idea what Tesla wanted to do with this coil?

I still wonder if the tesla turbine is related to the bifilar coil.

Impedance is equal to the wire resistance when every thing is in phase and the next logical step would be to negate the resistance in my opinion. Tesla mentions this and he gave one example of a bell in a vacuum chamber ringing for months. He also did experiments with circuits which were cooled to very low temperatures which could also operate for extended periods of time.

It may be that the bifiliar coil was not a silver bullet in itself but one component among others to produce a desired effect. Most LC circuits ring down within a few cycles due to the dissipation of energy however Tesla claimed his could operate indefinitely. Thus in my opinion the first logical step would be to try and build a self-sustaining device. Nelson Rocha was also moving in this direction not unlike many others before him. First he seemed to produce circuits which could sustain it's own oscillations and only then did he move on to circuits in which the output seemed to exceed the input.

If resistance generally dampens the oscillations within a few cycles then there must be an equal yet opposite force which seeks to maintain the oscillations in order for it to become self-sustaining. Therefore it seems logical to send a single impulse into a circuit and if the oscillations get longer because of something we did then we are moving in the right direction and if the oscillations get shorter then we should consider why and find ways to correct it.

I have found it is much easier to tackle one problem at a time versus trying to do everything at once because everything seems to have such a high learning curve.

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I have found it is much easier to tackle one problem at a time versus trying to do everything at once because everything seems to have such a high learning curve.

I hear what you say. you seem pretty well up to date. but I learn in my owns style.
a bit chaotic, but I works for me.

a self looped system is what I am working on now. trying to feed the back emf of a pulsed bifilar coil, into the resonant coil, to double the resonant energy, because its a positive feedback. this can be done if the back emf is parked into a capacitor, and injected (discharged) into the resonant sine at the right phase angle.

I tend to work broad instead of deep.
with deep I mean one aspect.

in the end all is connected and dependend on all elements working together.
anyway.

thanks again for your input. you seem well educated.

I tried getting 2 coils into resonance. one from a parallel pulsed coil, and one from the back emf of the pulsed coil.

the parallel coil is tuned down with the 10nf parallel cap.

the back emf isnt strong enough. it shuld be a strong spike but after the diode there is a strong ringing. but its not resonant at all. i tried tuning it, but the parallel cap is a different value for this coil. seems it needs to be much bigger than the 10 nf, to be resonant at 170khz (the parallel coil is resonant here).

so... i have to try differnt parallel caps with the back emf coil to get it resonant at the same frequency, so i can see the differnce in phase