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diff --git a/2075/CH7/EX7.7/pe7_7.sce b/2075/CH7/EX7.7/pe7_7.sce
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+//example 7.7
+clc;funcprot(0);
+//Initialization of Variable
+V1=12;//V
+V2=22;//V
+I=.7;//A
+Ta=80;//degreeC
+Ps=17.1//supply power
+//calculation
+K=V2/1.23-1;
+disp(K,"Rf/Ri=:")
+printf('pick Rf=22; Ri=1.3;')
+Id=round(Ps/V1*10)/10;
+D=round((1-(V1/V2))*100)/100;
+Ir=D^.5*Id;
+disp(Id,"rms current in A:")
+Ps=Ir^2*.15;
+disp(Ps*1000,"switch power in mW:")
+Pi=D*Id*V1/50;
+disp(Pi*1000,"IC power in mW:")
+P=Ps+Pi;
+disp(P*1000,"total power in mW:")
+T=Ta+P*65;
+disp(T,"IC temperature in degreeC:")
+clear()