We got a few heavy rotor units without a direction read-out. The above schematic is build and tested in our rotors with good results. The display for read-out is made by Velleman and can be orderd here. Use a 10 turn pot in the rotor and in the read-out circuit.

A close up of the reader in the rotor.
More photo's of the rotor work can be seen here.

An old hamIV control unit is used.