initial commit / add all books

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diff --git a/3041/CH8/EX8.4/Ex8_4.sce b/3041/CH8/EX8.4/Ex8_4.sce
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+//Variable declaration
+Vi=25                         //input voltage(V) 
+Vsmax=30                      //supply voltage max(V)
+Vomin=12                   //output minimum voltage or load voltage(V)
+Vl=12
+R1=20                         //load voltage(V)
+Io=15.                        //output current(mA) 
+Iq=3.                         //quinscent current of regulator(mA)
+Vo=20.                        //output voltage(V)
+
+//Calculations
+//Part a
+//(i)
+Vimax=Vsmax                     //maximum permissible voltage(V)
+Ro=0                            //for Vomin=beta=0
+//(ii)
+Vomax=Vi-2
+betaVomax=Vomax-Vomin                   //output voltage(V)
+R2max=(R1*betaVomax)/(Vomax-betaVomax)  //R2max(k ohms)
+//(iii)
+R3=betaVomax/Io                         //R3(k ohms)
+
+//Part b
+Vt=(Iq*betaVomax)/Io                   //common terminal fall(V)
+Vomin1=Vl+Vt                           //voltage output minimum(V)
+
+//Part c
+betaVo=Vo-Vl                          //output voltage(V)
+beta=betaVo/Vo                        //current gain
+R2=(R1*betaVo)/(Vo-betaVo)            //R2(ohms)
+
+//Results
+printf ("a)i)max permissible supply voltage is %.1f V",Vimax)
+printf ("ii)output voltage range for Vi=25V is %.1f V to %.1f V and R2max is %.f k ohms",Vomin,Vomax,R2max)
+printf ("iii)R3 is %.2f kohms kohms",R3)
+printf ("b)Vomin is %.1f V",Vomin1)
+printf ("c)R2 is %.2f ohms and R3 is %.3f ohms",R2,R3)