Remote symmetric matchbox - part 3

The last batch of PCBs finally arrived. So.. here I present you with the coil switching board for the symmetric matchbox.

As you can see the board is symmetric, but can be cut in half if that is needed. I have couple of

extra and might use them for some other similar project that won't need both sections. 

PCB for coil switching board

The design inductance was 0 to 16uH per section in 256 steps. So I wound the coils on the Txx-6 cores that are good for HF signals (10-40Mhz). I used 0.6mm diameter enameled copper wire to make sure the biggest coil fits the core (42 turns).

Check the winding table below:

L [uH]	core	Al / 100t	turns	Lr [uH]
0,06	T50-6	40	4	0,064
0,125	T50-6	40	6	0,144
0,25	T50-6	40	8	0,256
0,5	T50-6	40	11	0,484
1	T50-6	40	16	1,024
2	T68-6	47	21	2,073
4	T68-6	47	29	3,953
8	T80-6	45	42	7,938

Populated coil switching board