Core: Amidon T-106-2 iron powder toroidal core
Wire: 0.5 mm enamelled copper wire
Turns: 67
Sufficient total wire lenght is 3 meters for each coil.
Thread the wire
67 times through the center of the toroidal core. Recheck carefully the
amount of turns after winding. Pre-solder the wires as shown in the picture.
After soldering
the coils L9 and L10, secure the toroids with the plastic ties through the
holes in the PCB.
Core: Amidon FT-37-77 ferrite toroidal core
Wire: Wrap wire AWG 30. Use different color for primary and secondary.
Primary turns: 40 (white in picture)
Secondary turns: 1 (black in picture)
Sufficient total wire lenght is 1 meters for primary winding
and one inch for the secondary. First thread the primary wire 40
times through the center of the toroidal core. Wind in two layers, one on the other. The style is not critical
but it is important to wind correct amount of windings. Next put the secondary
wire through the center. Strip the wires as shown in the picture. See soldering
details in the
main board
pictutes.