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//chapter9
//example9.25
//page173
Ei=45 // V
Vz1=15 // V
Vz2=15 // V
Iz=200d-3 // current rating for each zener in ampere
Eo=Vz1+Vz2
R=(Ei-Eo)/Iz
printf("regulated output voltage = %.3f V \n",Eo)
printf("required series resistance = %.3f ohm \n",R)
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