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diff --git a/863/CH4/EX4.9/Ex4_9.txt b/863/CH4/EX4.9/Ex4_9.txt
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+++ b/863/CH4/EX4.9/Ex4_9.txt
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+//Caption:Determine required capacitance
+//Ex4.9
+clc;
+clear;
+close;
+E=4//Input voltage(in volts)
+Pw=1//Pulse width(in ms)
+Rs=1//Source resistance(in kilo ohm)
+Vce=0.2//Saturated Collector emitter voltage(in volts)
+Rc=1//Collector resistance(in kilo ohm)
+Vcc=10//Collector voltage(in volts)
+hfe=100
+Vbe=0.7//Base emitter voltage(in volts)
+Rb=10//Base resistance(in kilo ohm)
+Ic=(Vcc-Vce)/Rc
+Ib=Ic*1000/hfe
+Irb=Vbe*1000/Rb
+ic=Ib+Irb
+I=(E-Vbe)/Rs
+C=Pw/(Rs*(log(I*1000/ic)))
+disp(C,'Required capacitance(in micro farad)=')
+\ No newline at end of file