Making the transformer

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You need a round ferrite former.
I got mine from an old computer. They are usually used as RF supressors on the switch wires.

The dimensions of mine was;
15mm Inner diameter
27mm Outer diameter
12mm Height

Start by winding L3, 450 turns of 0,1mm

You can fix each layer with some epoxy, but i did not, and it was OK anyway.

Wind on L2, 10 turns of 0,1mm

Please note that all 3 layers must be wound in the same direction.
 

 

Finally, wind on L1, 20 turns of 0,5mm



When the coil is tested, you should put on some epoxy.