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diff --git a/863/CH7/EX7.4/Ex7_4.txt b/863/CH7/EX7.4/Ex7_4.txt
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+//Caption:Design a astable multivibrator 
+//Ex7.4
+clc;
+clear;
+close;
+f=1//Frequency of output waveform(in Khz)
+Vs=5//Supply voltage(in volts)
+Il=20//Output load current(in micro Ampere)
+hfe=70
+Vbe=0.7//Base emitter voltage(in volts)
+Ic=Il*100/1000
+Rc=Vs/Ic
+Ib=Ic/hfe
+Rb=(Vs-Vbe)/Ib
+pw=1/(2*f)
+C=pw*10^(6)/(0.69*Rb)
+disp(C,Rb,Rc,'Components required to design a astable multivibrator are resistances Rb,Rc(in kilo ohm) and Capacitance(in pf)=')
+\ No newline at end of file