abbaidd

Hi friends! I'm new in the forum and I'm building a Voltage Regulator Tester for cars and I'd like some of your help, so I was wondering what kind of transistor should I use for this diagram that I've found in the web and what are the values of the capacitance of the rectifier and What advantages has the last diagram of this pdf document against the fist one I post here http://www.google.com/patents/US3947757?printsec=abstract&dq=3947757&ei=I-o9T_jDGcfWtgfKjOWuBQ#v=onepage&q=3947757&f=false