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diff --git a/1223/CH12/EX12.19/Ex12_19.sce b/1223/CH12/EX12.19/Ex12_19.sce
new file mode 100755
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+++ b/1223/CH12/EX12.19/Ex12_19.sce
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+clear;
+clc;
+//Example 12.19
+//T=b*100/(sqrt(1+(f/10^5)^2) angle=-3tan^-1(f/10^5)
+//stable at f180 at which phase becomes -180 degrees
+//-3*atan(f180/10^5)=-180
+f180=tand(180/3)*10^5;
+printf('\nfrequency at -180 degree=%ef Hz\n',f180)
+b=0.2;
+T=b*100/(sqrt(1+(f180/10^5)^2))^3;
+printf('\nmagnitude of the loop gain=%.2f\n',T)
+b=0.02;
+T=b*100/(sqrt(1+(f180/10^5)^2))^3;
+printf('\nmagnitude of the loop gain=%.2f\n',T)