not totally sure what is going on. two pancake coils are in a wireless resonance type of relationship. the wireless transmission is like in the last video based on an idea of @Slider2732 . all that is also going into a wireless relationship with another cristal radio type of circuit which is also based on @Slider2732 . the signal from this circuit goes straight to my axoloti based diy synth and effects setup.
...
https://www.youtube.com/watch?v=eW1hG_NqQc4