Transistor base resistor question

[trackman44]

I think your darlington gain may be out by an order of magnitude. I also prefer that to switch a transistor on then it should be driven properly on, not just tickled in the right direction.

Yes, i maybe wrong in the gain, that's why I stated "what are the specs". You don't want the base resistor to be too low to the point where you might damage the darlington. It would be a good idea to first test the circuit in LTSpice. Another thing, does the MIC502's output stay on if it only draws 60uA, or 0.6mA, or 6mA? Output is 8.6V at 10mA, you might need to draw off some of that current through a resistor to ground before the base resistor.

Will