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+// Exa 15.11
+
+clc;
+clear all;
+
+// Given data
+
+Fc=4;// kHz
+Q=8;
+
+// Solution
+
+disp(" The FLT-U2 can be used as a notch filter by summing the inverted output of the bandpass filter designed with the input signal by means of the uncommitted opamp.");
+
+// From table 15.3 given on page no 538
+R2=100;// k Ohms
+R3=100/((3.40*Q)-1);
+// R1 treated as open circuit
+printf(' The R1 is open while R2 and R3 are %.1f , %.2f K ohms respectively \n',R2,R3);
+
+// From equations 15.54 given on page no 538 we get R4 and R5
+R4=(5.03)*10^7/(Fc*10^3);
+R5=R4;
+printf(' The calculated value of R4=R5=%.2f k Ohms(12 k Ohms) \n',R4/1000);
+disp(" Let R6=R7=R8=10 K ohms ");
+R=10000;//R=R6=R7=R8=10 k Ohms
+R9=(1/R+1/R+1/R)^-1;
+printf(' The value of R9 =%.2f K ohms \n',R9/1000);
+disp(" The complete circuit diagram is shown in fig. 15.26 on page no. 541.");
+// The value of R3 vary due to round off error.