initial commit / add all books

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+//example6.30

+disp("The circuit used for providing proper biasing is self bias, for which the various currents can be shown in the fig 6.52")

+disp("Applying KVL to base emiter loop,")

+disp("(-V_BE)-(I_E*R_E)+(I*R2)=0")

+disp("Theredfore (I*100)-(1+beta)*I_B*10=V_BE")

+disp("100I-210(I_B)=0.5     ..(1)")

+disp("Applying KVL through R1 and R2,")

+disp("(-R1(I+I_B))-(R2*I)+V_cc=0")

+disp("-1000(I+I_B)-100I=-V_cc")

+disp("1100I+1000(I_B)=25    ..(2)")

+disp("Multiplying equation (1) by 11 and subtracting from equation (2) we get,")

+disp("3310(I_B)=19.5")

+i=19.5/3310

+disp(i,"Therefore I_B(in A)=")

+format(8)

+disp("Thereofore I_C=(beta*I_B)=117.82 mA=I_CQ")

+disp("Now n=N2/N1=1/8")

+r=5*(8^2)

+disp("Therefore (R''_L)=(R_L)/(n^2)=")

+disp("i) For maximum power delivered to load,")

+disp("V_1m=V_CEQ")

+disp("Apply KVL to collector-emitter loop,")

+disp("(-10I_C)-(V_CEQ)-(10*I_E)+V_CC=0")

+v=25-(20*(117.82*10^-3))

+format(7)

+disp(v,"V_CEQ=V_cc-20*I_C     ...I_C=I_E")

+p=(22.643^2)/640

+disp(p,"(P_ac)_pri[in W]=(V_CEQ^2)/(2*R''_L)=")

+p=0.9*0.8011

+disp(p,"(P_ac)_max[in W]=0.9*0.8011=")

+disp("This is maximum power delivered to the load.")

+p=25*117.82*10^-3

+format(7)

+disp("ii) Now (P_DC)[in W]=V_CC*I_CQ=")

+n=(0.721*100)/2.9455

+format(6)

+disp(n,"%eta=(P_ac*100)/(P_dc)=")