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+//chapter 16
+//example 16.1
+//page 473
+clear all;
+clc ;
+//given
+Eo=20;//supply voltage
+Rl=500;//load resistance in ohm
+Vr=10/100*Eo;//ripple voltage
+fin=60;//ip frequency Hz
+Eomin=Eo-1;
+Eomax=Eo+1;
+theta1=asin(Eomin/Eomax);//in radians
+theta=(theta1*180)/%pi;//in degrees
+T=1000/60;//in  ms
+//for 360 degree,T
+//for 180=>
+T1=T *180/360;
+T2=T1/2;//time for 90 degrees
+T3=T*theta/360;//time for theta
+t1=T1+T2+T3;//total time
+Il=1000*Eo/Rl;//current in mA
+c=Il*t1/Vr;
+printf("\nReservoir capacitor is %d microF,use standard value 330 microF",ceil(c))
+
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