pondělí 17. března 2014

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

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