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diff --git a/863/CH7/EX7.5/Ex7_5.txt b/863/CH7/EX7.5/Ex7_5.txt
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+//Caption:Design a astable multivibrator using 741 op amp
+//Ex7.5
+clc;
+clear;
+close;
+f=300//Output frequency(in hertz)
+Vo=11//Output Amplitude(in volts)
+utp=0.5//Upper trigger voltage(in volts)
+Vr3=0.5//Votage across R3 resistor(in volts)
+Ib=500//Base current(in nA)
+Vcc=Vo+1
+I2=100*Ib/1000
+R3=Vr3*1000/I2
+Vr2=Vo-Vr3
+R2=Vr2*1000/I2
+Ir1=100*Ib/1000
+Vr1=Vo-Vr3
+R1=Vr1*1000/Ir1
+t=1000/f
+tc1=0.5*t
+ltp=-utp
+v=utp-ltp
+C=Ir1*tc1*10^(-3)/v
+disp(C,R3,R2,R1,'Circuit components for designing astable multivibrator are R1,R2,R3(in kilo ohm) and Capacitance(in micro farad)=')
+\ No newline at end of file