1. Part 1 Consider the rectifier circuit with a filter capacitor below. The resistance of the load resistor R1 is 250 2. The rectifier uses silicon diode that can be modeled to have 0.7 V drop when conducting. T1 120 Vrms ac 60 Hz HH 0 + v out R1 (a) The peak output voltage is to be around 9 V, and the ripple voltage is to be no more than 5% of the peak voltage. Determine the required tum ratio of the step-down transformer, and the required value of the filter capacitor. (10 points) 1. Part 2 To reduce the variation of output voltage from above rectifier, a Zener voltage regulator can be inserted (dashed box). A shunt Zener voltage regulator is shown below. R2 w raw supply voltage Zener Load Suppose that the raw supply voltage to the Zener shunt regulator varies between 8.5 and 9 V, and the load current varies between 0 and 20 mA. The Zener shunt regulator provides an output voltage approximately 5 V. The Zener diode(1N4733) has Vz = 5.1 V at the test current of 45 mA, and incremental resistance r = 72 at 45 mA test current. (a) Determine the resistance value of the resistor R2 for minimum Zener current of 5mA. Use standard resistor value for the design (last page). (10 points)