Ferrite at Work

Hello team,
special thanks to Nekvadrat.

here is my setup (with the materials I had on hand):

- 2 ferrites dimensions: 36 X 22 X 15 mm (unknown material - old stock);
- 1 capacitor 2,2uF 250 V (C1) unpolarized, reference A50IT42202660K;
- 1 capacitor 0,66 uF (C2) unpolarized;
- 1 capacitor 3,2nF HT unpolarized (added in parallel with D2 for more luminosity on D1);
- 1 NPN 30 V transistor, 120 mHz, 2 A;

- L1, L2, L4, L5 and L6: Litz wire 0.1 mm X 180 strands;
- L3: 0.2mm x 19 strands tinned copper, stranded wire;
- R1 50 kΩ X 2 A (50 is sufficient, besides I did not have 100 k) ;

- V1: 2 AAA rechargeable batteries 1.2 V, 700mAh NiMH in series.

- I needed, as indicated above, to reverse the ends of L3.
- I secured the two loops of L6 with smalls nylon clamps.

I stopped adjusting R1 just as both leds stopped flashing.
D1 is very bright, D2 is much less.
V1 is currently stabilized at 2.280 V, after a gradual increase in voltage (starting at 2.150 V).
The circuit was powered up about 20 hours ago, so it will be necessary to monitor progress.