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//chapter9
//example9.26
//page173
Ei=45 // V
Vz1=10 // V
Vz2=10 // V
Vz3=10 // V
Iz=1000d-3 // current rating for each zener in ampere
Eo=Vz1+Vz2+Vz3
R=(Ei-Eo)/Iz
printf("required series resistance = %.3f ohm \n",R)
// since zener diode is not available in xcos, simple diodes are used to represent zener diode in the circuit made in xcos
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