1. The problem statement, all variables and given/known data Design a full-wave regulated power supply using a 5:1 center-tapped transformer and a 7.5 V, 1 W Zener diode. The power supply must provide a constant 7.5 V to a load varying from 120 to 450 . The input voltage is 120 V(rms), 60HZ. 2. Relevant equations 3. The attempt at a solution http://s1233.photobucket.com/albums/ff382/chie8/?action=view¤t=asd.png The oscilloscope shows no voltage drop across the 7.5V zener diode.