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+// Chapter 9
+// determine Output frequency
+// Page.No-327
+// Example9_7
+//Figure 9.28
+// Given
+clear;clc;
+Vp=12;          //in V
+R1=4700;            //in Ohm
+R2=2000;            //in Ohm
+R3=20000;            //in Ohm
+C=1.1*10^-9;            //in Farad
+Vc=Vp*(R3/(R2+R3));
+printf("\n The control Voltage is  = %.2f V\n",Vc); // Result
+fo=2*(Vp-Vc)/(Vp*R1*C);
+printf("\n Output frequency  = %.0f Hz\n",fo); // Result