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diff --git a/1223/CH7/EX7.3/Ex7_3.sce b/1223/CH7/EX7.3/Ex7_3.sce
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+++ b/1223/CH7/EX7.3/Ex7_3.sce
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+clear;
+clc;
+//Example 7.3
+R1=51.2;
+R2=9.6;
+Rc=2;
+Re=.4;
+Rsi=.1;
+Vt=0.026;
+Cc=1;
+Vcc=10;
+Vbe=0.7;
+b=100;
+Rb=8.08;
+Icq=1.81;
+gm=Icq/Vt;
+printf('\ntransconductance=%.3f mA/V\n',gm)
+r=b*Vt/Icq;
+printf('\ndiffusion resistance=%.2f KOhm\n',r)
+x=r+(1+b)*Re;
+y=x*R2/(x+R2);
+Ri=y*R1/(R1+y);
+printf('\ninput resistance=%.3f KOhm\n',Ri)
+Ts=(Rsi+Ri)*Cc;
+printf('\ntime constant=%.3f ms\',Ts)
+Ts=6.87*10^-3;//Sec
+fL=1/(2*%pi*Ts);
+printf('\ncorner frequency fL=%.3f Hz\n',fL)
+Rib=r+(1+b)*Re;
+printf('\nRib=%.3f KOhm\n',Rib)
+Av=(gm*r*Rc/(Rsi+Ri))*Rb/(Rb+Rib);
+printf('\nsmall signal voltage gain=%.2f\n',Av)