initial commit / add all books

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diff --git a/281/CH10/EX10.1/example10_1.sce b/281/CH10/EX10.1/example10_1.sce
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+disp('chapter 10 ex10.1')

+disp('given')

+disp('design a triangular rectanglar signal generator to have 5volt triangular output')

+disp('frequency ranging from 200Hz to 2kHz and a duty cycle adjustable from 20% to 80%')

+disp('using bipolar op-amps with a supply of +or-15volt')

+Vcc=15

+Vo=5

+f1=200

+f2=2000

+disp('Schmitt circuit design')

+disp('I3>IBmax')

+disp('let I3=50*10^(-6)A and Vf=0.7volt')

+IBmax=500*10^(-9)

+I3=50*10^(-6)

+Vf=0.7

+disp('R2=Vosat/I3')

+R2=(Vcc-1)/I3

+disp('ohms',R2)

+disp('use 270kohm standard value and recalculate I3')

+R2=270000

+disp('I3=Vosat/R2')

+I3=(Vcc-1)/R2

+disp('amperes',I3)

+disp('R3=UTP/I3')

+R3=Vo/2/I3

+disp('ohms',R3)    //use 47kohm and 1kohm

+disp('integrator circuit')

+disp('let C1 charging current I1min=50*10^(-6)A')

+I1min=50*10^(-6)

+disp('lowest frequency f1,PWmax=80%of Tmax')

+PWmax=0.80*1/f1

+disp('watts',PWmax)

+disp('C1=I1min*t/v')

+C1=I1min*PWmax/Vo

+disp('farads',C1)    //standard value

+disp('R4+R5+R6=(+Vosat-Vf)/I1min')

+disp('R9=R4+R5+R6')

+R9=(Vcc-1-Vf)/I1min

+disp('ohms',R9)

+disp('If2=I1min*f2/f1')

+If2=I1min*f2/f1

+disp('amperes',If2)

+disp('R5+R6=(+Vosat-Vf)/If2')

+disp('R8=R5+R6')

+R8=(Vcc-1-Vf)/If2

+disp('ohms',R8)

+disp('R4=(R4+R5+R6)-(R5+R6)')

+R4=R9-R8

+disp('ohms',R4)  //use 250kohm standard value potentiometer

+disp('PWmin=20% of Tmax')

+PWmin=.20*1/f1

+disp('watts',PWmin)

+disp('R6=(R5+R6)*PWmin/PWmax')

+R6=R8*PWmin/PWmax

+disp('ohms',R6)

+disp('use 6.8kohm standard value')

+R6=6800

+disp('R5=(R5+R6)-R6')

+R5=R8-R6

+disp('ohms',R5)   //standard value of potentiometer

+disp('R7=R6=6.8kohm')
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