(10 points) Diode D1 in the circuit below can be modeled as constant voltage drop VD=0.7V. For the zener diode D2 VZ-6.8V @ IZT=37mA with rz=3.5. Also C-870 μF and R=1012. a. Calculate the average voltage at terminal Vo in V. b. Calculate the ripple voltage at terminal Vo in mV. Note: In this problem, you may only submit numerical answers accurate to 0.02% or better. (i.e. If 4 is the correct answer, 3.9999 will be marked as correct, but 2+2 will be marked as incorrect. ) 120Vrms 60Hz (a) Vope (b) Var or V mV TX mm. 12:1 D1 0 R Vo w D2