initial commit / add all books

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diff --git a/74/CH8/EX8.1/example1_sce.sce b/74/CH8/EX8.1/example1_sce.sce
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+// chapter 8

+//example 8.1

+//page 293

+R=10*10^3;C=.1*10^-6;// given 

+t=1.1*R*C;//output pulse width

+disp(t)//pulse widht in sec
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diff --git a/74/CH8/EX8.2/example2_sce.sce b/74/CH8/EX8.2/example2_sce.sce
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+//chapter 8

+//example 8.2

+//page 298

+R1=4*10^3;R2=4*10^3;// given for 555 timer

+C=.01*10^-6;//for 555 timer

+f=1.44/((R1+2*R2)*C);

+disp(f)//frequency of output in Hz

+D=(R1+R2)/(R1+2*R2);

+disp(D)//duty cycle

+percentage=D*100
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diff --git a/74/CH8/EX8.3/example3_sce.sce b/74/CH8/EX8.3/example3_sce.sce
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+//chapter8

+//example 8.3

+//page300

+Ton=5;//given

+C=10*10^-6;//let assume

+R=Ton/(1.1*C);//using Ton=1.1RC

+disp(R)//this not standard value but we can adjust by connecting variable resistance
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diff --git a/74/CH8/EX8.4/example4_sce.sce b/74/CH8/EX8.4/example4_sce.sce
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+//chapter 8

+//example 8.4

+//page 301

+Toff=1;Ton=3;//given

+C=10*10^-6;//choosing 

+R2=Toff/(.693*C);//using eq Toff=.693RC

+disp(R2)//resistance

+//Ton=.693(R1+R2)C

+R1=(Ton/(.693*C))-R2;

+disp(R1)//required resistance
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diff --git a/74/CH8/EX8.5/example5_sce.sce b/74/CH8/EX8.5/example5_sce.sce
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+//chapter8

+//example8.5

+//page301

+T=10*10^-3;//for proper operation of LED which remain ON for 10msec

+C=.22*10^-6//choose

+Vcc=15;Vbe=.7;Vcesat=.2;//given

+Vled=1.4;Iled=20*10^-3;

+//T=1.1RC

+R=T/(1.1*C);

+disp(R)

+Vo=Vcc-2*Vbe-Vcesat;//output of timer

+disp(Vo)

+Rled=(Vo-Vled)/Iled;

+disp(Rled)//this resistance must be in series whit LED

+f=1000;D=95;//for an astable timer

+C1=.01*10^-6;

+R1=%s;R2=%s;

+f=1.44/(R1+2*R2)*C;//frequency--------------eq(1)

+D=(R1+R2)/(R1+2*R2)//duty cycle-------------eq(2)

+R2=.0555*R1;//from eq(2)

+//put it in eq(1)

+R1=144*10^3/(1+2*.0555);

+disp(R1)

+R2=.0555*R1;

+disp(R2)
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diff --git a/74/CH8/EX8.6/example6_sce.sce b/74/CH8/EX8.6/example6_sce.sce
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+++ b/74/CH8/EX8.6/example6_sce.sce
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+//chapter 8

+//example 8.6

+//page 302

+T=5*10^-3;

+C=.1*10^-6;

+//T=1.1RC

+R=T/(1.1*C);

+disp(R)//value of R should be less than 100k as obtain above
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diff --git a/74/CH8/EX8.7/example7_sce.sce b/74/CH8/EX8.7/example7_sce.sce
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+//chapter8

+//example8.7

+//page 303

+f=1000;

+T=1/f

+Td=T/2

+C=.1*10^-6;

+//Td=.69R2C

+R2=Td/(.69*C);

+disp(R2)

+R1=R2//for square wave R1=R2
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