Question 15.9: What regulated output voltage is provided by the circuit of ...

What regulated output voltage is provided by the circuit of Fig. 15.15 for the circuit elements R_{1}=20 k \Omega, R_{2}=30 k \Omega, and V_Z = 8.3 V?

15.15
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From Eq. (15.17),

V_{o}=\frac{R_{1}+R_{2}}{R_{2}}\left(V_{Z}+V_{B E_{2}}\right)                                  (15.17)

the regulated output voltage is

V_{o}=\frac{20 k \Omega+30 k \Omega}{30 k \Omega}(8.3 V +0.7 V )= 1 5 V

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