initial commit / add all books

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diff --git a/61/CH13/EX13.1/ex13_1.jpg b/61/CH13/EX13.1/ex13_1.jpg
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diff --git a/61/CH13/EX13.1/ex13_1.sce b/61/CH13/EX13.1/ex13_1.sce
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+//ex13.1

+R2=1*10^3;

+R1=8.2*10^3;

+V=15;

+V_REF=R2*V/(R1+R2);

+disp(V_REF,'V_REF in volts')

+V_max=12;    //maximum output level of op-amp

+V_min=-12;    //minimum output voltage of comparator

+f=1;    //assume frequency of input wave to be 1 hertz

+t=0:0.001:3;

+V_in=5*sin(2*%pi*f.*t)

+clf();

+subplot(121)

+xtitle('Input to comparator-1')

+plot(t,V_in)

+subplot(122)

+xtitle('Output of Comparator-1')

+a=bool2s(V_in>=V_REF)

+b=~a;

+y=V_max*a+V_min*b;

+plot(t,y)

+disp(V_max,'max output voltage in volts')

+disp(V_min,'min output voltage in volts')
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