The three-terminal voltage regulator in Figure 15.51 has parameters as described in Example 15.16. Assume \(R_{4}=0, V_{A}=50 \mathrm{~V}\) for \(Q_{4}\), and \(r_{z}=15 \Omega\) for \(D_{2}\). Determine the line regulation.

Data From Example 15.16:-

Figure 15.51:-

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Determine the bias current, temperature-compensated reference voltage, and required resistor R12 in a particular LM78LXX voltage regulator. Consider the voltage regulator circuit in Figure 15.51. Assume Zener diode volt- ages of Vz = 6.3 V and transistor parameters of VBE (npn) = VEB (pnp) = 0.6 V. Design R12 such that Vo = 8 V.