ante said:
Not bad! Am I totally of the tracks here?? :roll:
I'm afraid so :lol:
You can't replace R2 with an op-amp, to make the current limiting fully variable would require different techniques. I don't think R1 has anything to do with setting the voltage, and it's difficult to get a PSU to work down to zero volts - the usual way is to have a negative voltage in the PSU, thus the power supply thinks it's outputing 2-3V, but the external voltage is actually zero.