beacause of my bad english...Icant understand your answer. i am also an amature in electronic.so please explain it more clear can you draw a diagram (or mybe a shematic) for me (about out put transistors)??????? :-* i cant understand it. and what is the range of each voltmeter????which of them show the current flowing trough the load.and which of them show the amps that was set with p2. note : its not NOT NECESSARY for me to set current at special place.but it IS important for me to show the current flowing trough the load... so help me please with diagram not with written message. :-* I hope you apologize me for my gossips :-[ :'(