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+//chapter 18
+//example 18.5
+//page 576
+clear;
+clc ;
+//given
+VB1B2=30;
+etamin=0.55;
+etamax=0.82;//efficiency
+Vpmin=0.7+(etamin*30);
+Vpmax=0.7+(etamax*30);
+printf("\nDevice will fire at emitter voltage between %.1f V and %.1f V",Vpmin,Vpmax);
+
+