In Fig. 5-40, the unregulated voltage out of the power supply may vary from 20 to 26 V and the load resistance may vary from 500 to 1.5kΩ. Will the zener regulator fail under these conditions? If so, what value should the series resistance be? 470 Ω POWER 24V SUPPLY 15V 1.5kΩ
Figure 5-40