1. (a) A voltage regulator is required to provide a constant voltage of between 4.2 and 4,8V to a system drawing 250mA. The available power supply is nominally 12V with a minimum of 10V and a maximum of 14V. (0) Select the components for a simple zener shunt regulator (Figure 1) to meet the above criteria. A list of available zener diodes is given below (ii) For your design, calculate the lowest voltage at which the output voltage Vout will be maintained reasonably constant by the regulator For the highest input voltage, determine the power dissipated in: the resistor (ii) (a) (b) the zener R: ZD1 Vin EN Vout Figure 1: Shunt regulator (b) Redesign the circuit as a series pass regulator, adding components to reduce dissipation in the zener and improve the range of available output voltages. A range of transistors and their characteristics are below. Calculate the maximum input voltage as not to cause the power transistor to exceed its maximum power rating. Zeners: Type IN5221B INS223B IN5226B IN5227B IN5228B INS229B Nominal zener voltage 2.4V 2.7V 3.3V 3.6V 3.9V 4.3V 4.7V 5.IV 5.6V Power rating 500mW 500mW 500mW 500mW 500mW 500mW INS230B 500mW INS231B IN5232B 500mW 500mW