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diff --git a/1223/CH15/EX15.4/Ex15_4.sce b/1223/CH15/EX15.4/Ex15_4.sce
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+clear;
+clc;
+//Example 15.4
+C=0.1*10^-6;
+R=1000;
+fo=1/(2*%pi*R*C*sqrt(3));
+printf('\nthe oscillation frequency =%.2fHz\n',fo)
+//minimum amplifier gain=8
+R=1;//KOhm
+R2=8*R;
+printf('\nR2=%.f KOhm\n',R2)