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+///Caption:Design a 555 astable multivibrator
+//Ex8.2
+clc;
+clear;
+close;
+p=2//Pulse repetition frequency(in Khz)
+d=0.66//Duty cycle
+Ic=1//Minimum collector voltage selected(in mA)
+Vcc=18//Supply voltage(in volts)
+t=1000/p
+t1=d*t
+t2=t-t1
+R=Vcc/(3*Ic)
+C=t1*0.001/(0.693*R)
+Rb=t2*0.001/(0.693*C)
+Ra=R-Rb
+disp(C,Rb,Ra,'Components required to design the circuit are resistors Ra,Rb(in kilo ohm) and Capacitance(in micro farad)=')
+\ No newline at end of file