Voltage regulator utilizes a 500 mW Zener diode with Vz=6.7V at 20mA, rz=lOohm and IzK=5mA. The supply voltage y+ has a nominal value of 12V but can vary by ± 1 V. The load resistor is fixed at 330ohm. Calculate Vzo and Rlimit to keep the Zener power dissipation low (choose a 5% standard resistor). Draw the circuit schematic and calculate the line regulation for this circuit.