Ferrite at Work

Wistiti! great to see that works for you too my friend!! 🙂

I want to add few points about the original circuit posted by Jagau, that I think will help the replicators to adjust it easier.

First of all do not underestimate the small cup C2 that is shorting the one loop coil L6. As I see it, the L6 purpose is to synchronize (tune) the two ferrites with the main frequency of the circuit. The other coils that suppose to be equal, must be equal, and the length of their leads should also be equal length and diameter of course. Or you can use an induction meter to trim them equal accordingly. If the circuit oscillates ok, the LED1 will light up anyway. But to get to the magic point you will have to light up the LED2 as well (Maybe will not light up with the same brightness as the LED1) but what you need to make sure is that they oscillate with the same rate without interruptions or delays from LED2 following LED1. This may not happen if the capacitor C2 is wrong value. But maybe you are lucky enough and the closed loop without any capacitor will much. Or you can try different width wires or by adding more loops at L6 and checking loop by loop where you get the wanted result.  C1 and potentiometer are there to give the desired range of frequency only. All the game is played at the correct (balanced) coils and C2. Again these are my observations and conclusions from testing it and I maybe wrong.