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diff --git a/2528/CH7/EX7.4/Ex7_4.sce b/2528/CH7/EX7.4/Ex7_4.sce
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+// Chapter7
+// Page.No-229
+// Example7_4
+// Sketch the Transfer Curve
+// Given
+clc;
+clear;
+Vz=3.9;         //in V
+Rf=20000;           //in Ohm
+Ri=5000;           //in Ohm
+Ra=10000;           //in Ohm
+Vbreak=Vz+0.7;
+printf("\n Vbreak +_ %.2f V",Vbreak);
+
+Av=-Rf/Ri;
+printf("\n Av %.2f ",Av);
+
+Av2=(-Rf*Ra/(Rf+Ra))/Ri;
+printf("\n Av2 %.2f ",Av2);
+//Graph
+t=-4:0.001:4;
+L=length(t);
+for i=1:L
+    if t(i)<-1.15
+        x1(i)=Av2*t(i)+3.0705;
+       
+     
+   elseif  t(i)<1.15
+        x1(i)=Av*t(i) ;
+       
+   
+      elseif t(i)>1.15
+        x1(i)=Av2*t(i)-3.0705 ;
+      end ;
+end;    
+clf;
+plot2d1(t,x1);
+xtitle('Transfer Characteristics','Vin','Vout')
+xgrid;