Hai Sahara
You may use the given circuit which is capable of delivering 1.2 volts to 32 volts DC with 2 ampheres current. But you have to use a transformer with 0-35V 2A on the secondary which may be rectified, filtered and then fed in to the given circuit.
Hope it helps you. Do not forget the helped me button. Good luck.
Hai Sahara.
It would have been clear if you had mentioned about the said specs in your first post itself. But nothing was mentioned about the "current" and the steps. Ok...for controlling voltage and current in such precise steps you have to go for a microcontroller design which i coudnt help you out. You may get better replies from fellow members. Good luck.