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diff --git a/1223/CH7/EX7.5/Ex7_5.sce b/1223/CH7/EX7.5/Ex7_5.sce
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+clear;
+clc;
+//Example 7.5
+b=100;
+Vbe=0.7;
+Rs=500;
+Rb=100000;
+Re=10000;
+Rl=10000;
+Va=120;
+Ccc2=1*10^-6;
+Icq=0.838*0.001;
+r=3100;//small signal parameter
+gm=32.2*0.001;
+ro=143000;
+x=(r+Rs*Rb/(Rs+Rb))/(1+b);
+y=ro*x/(ro+x);
+Ro=Re*y/(Re+y);
+printf('\noutput resistance of emitter=%.2f Ohm\n',Ro)
+Ts=(Ro+Rl)*Ccc2;
+printf('\ntime constant=%.2f s\n',Ts)
+fL=1/(2*%pi*Ts);
+printf('\n3dB frequency=%.2f Hz\n',fL)