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diff --git a/74/CH3/EX3.11/example11_sce.sce b/74/CH3/EX3.11/example11_sce.sce
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+//chapter 3
+//example 3.11
+//page 147
+fa=150;fmax=150;//given
+C1=1*10^-6;// assuming
+Rf=1/(fa*2*%pi*C1);//fa=1/2piRfC1
+disp(Rf)
+fb=10*fa;// safe frequency
+disp(fb)
+R1=1/(2*%pi*fb*C1);//fb=1/2piC1R1
+disp(R1)
+Cf=((R1*C1)/Rf);//using R1C1=RfCf
+disp(Cf)
+Rcomp=(R1*Rf)/(R1+Rf);//rcomp=R1||Rf
+disp(Rcomp)// generally Rcomp is selected equal to R1
+\ No newline at end of file