When you want DC power supply Circuit , model to fine the value Voltage get 0-30V for apply general work. I thinks this circuit may is appropriate , because of give current get 2 Amp enough be usable experience all get comfortablely. By it uses ordinary equipment seek easy be IC LM723 for control voltage the level is all and systematically protect completely. And still have 2N3055 number transistors help boost current give tall fair the work. The detail is other , you have can to see in original website http://www.next.gr