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+// Chapter 9
+// determine Output frequency
+// Page.No-340
+// Example9_11
+// Given
+clear;clc;
+f=2000;         ///in Hz
+DC=0.8;
+T=1/f;
+Thigh=DC*T;
+printf("\n T high is  = %.6f Sec\n",Thigh); // Result
+Tlow=T-Thigh;
+printf("\n T low is  = %.6f Sec\n",Tlow); // Result
+//assumption
+Rb=10000;            //in Ohm
+//Tlow=0.69RC
+C1=Tlow/(0.69*Rb);
+printf("\n Value of Capacitance C is  = %.10f F\n",C1); // Result
+//Thigh=0.69(Ra+Rb)
+Ra=Thigh/(0.69*C1)-Rb;
+printf("\n Value of resistance Ra is  = %.0f Ohm\n",Ra); // Result