Hi, First question, "It uses a 5V precision micropower voltage reference (U2-LT4050)" . This LT4050 have disapear?? Not nedded anymore?.. A seconde question, I pretend make a Supply like yours, but to use with one transformer of (2x15.5V 3A) or (31V 1.5A). I need to make modification in the circuit or not? Thanks, Hugo