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diff --git a/863/CH5/EX5.5/Ex5_5.txt b/863/CH5/EX5.5/Ex5_5.txt
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+//Caption:Calculate lowest operating frequency for circuit
+//Ex5.5
+clc;
+clear;
+close;
+V=4//Peak to peak amplitude of output waveform(in volts)
+Vi=10//Input voltage(in volts)
+Vs=15//Supply voltage(in volts)
+Ib=500//Maximum Base current(in nA)
+f=250//Frequency of input waveform(in hz)
+I=1//Circuit current(in mA)
+R1=Vi/I
+R3=20*R1
+R2=(R3*R1)/(R1+R3)
+t=1000/(2*f)
+C=(I*t)/V
+F=20*1000/(2*%pi*C*R3)
+disp(F,'Required frequency(in hz)=')
+\ No newline at end of file