Hola Mike
I know I could try values until I get something that works but I would like to know how to reasonably estimate a value to start testing a base resistor. For that I measured the voltages for five conditions including that of "no load".
Honestly I do not know where to start. Stumped this time.
Measurements belong to the first circuit.
/Edit to add:
I forgot to tell that for "No load" I measured the drop across Rsense allowing to calculate about 27 mA. Is it possible that the op amp is sucking that much of current?
/Edit