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diff --git a/752/CH6/EX6.4.1/6_4_1.sce b/752/CH6/EX6.4.1/6_4_1.sce
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+clc;
+// page no 205
+// prob no 6_4_1
+// colpitt's oscillator
+L=400*10^-6;// in H
+c1= 100;// in pF
+c2= 300;// in pF
+Q=200;
+Ro= 5*10^3;
+Bo=100;//beta value
+// The tuning capacitance is
+Cs=(c1*c2/(c1+c2));
+disp('pF',Cs,+'1.The value of capacitor is ');
+//  the frequency of oscillation is obtained as
+f=1/(2*%pi*sqrt(L*Cs*10^-12));
+disp('Hz',f,'2.The frequency of oscillation is');
+// The dynamic impedence of the tuned circuit 
+wo= 2*%pi *f;
+Rd=Q/(wo*Cs*10^-12);
+disp('ohm',Rd,+'3.The dynamic impedence of the tuned circuit');
+// The coil series resistance is 
+r=wo*L/Q;
+disp('ohm',r,+'4.The coil series resistance is ');
+//The capacitor raio c= c1/c2=1/3, and therefore 1-c2/B0*c1 = 1 .
+// The starting value of gm is therefore given by
+c= c1/c2;
+gm=(1/Ro)*c +(c+3+2)*(1/Rd);
+disp('sec',gm,+'5.The value of gm is');
+// Assuming the input resistance is that of the transistor alone,
+R1=Bo/gm;
+disp('ohm',R1,+'6.The input resistance is');
+//The actual starting frequency is obtained from wo^2=(1/LCs)+(1/R1R2C1C2)
+wo2=1/((L*Cs*10^-12)+(1/R1*Ro*c1*c2*10^-12*10^-12));
+wo=sqrt(wo2);
+// Hence the frequency is 
+f=wo/(2*%pi);
+disp('Hz',f,'7.The frequency of oscillation is');
+\ No newline at end of file