initial commit / add all books

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diff --git a/2459/CH12/EX12.12/Ex12_12.PNG b/2459/CH12/EX12.12/Ex12_12.PNG
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diff --git a/2459/CH12/EX12.12/Ex12_12.sce b/2459/CH12/EX12.12/Ex12_12.sce
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+//chapter12

+//example12.12

+//page249

+

+Vcc=15 // V

+Re=2 // kilo ohm

+Rc=1 // kilo ohm

+gain_beta=100

+Vbe=0.7 // V

+R1=10 // kilo ohm

+R2=5 // kilo ohm

+

+Eo=Vcc*R2/(R1+R2)

+Ro=R1*R2/(R1+R2)

+

+printf("thevenin voltage = %.3f V \n",Eo)

+printf("thevenin resistance = %.3f kilo ohm \n",Ro)

+

+// here Eo=Ib*Ro+Vbe+Ie*Re

+// now considering Ie=gain_beta*Ib, and making Ib as subject we get

+// Ib=(Eo-Vbe)/(Ro+gain_beta*Re)

+// Ic=gain_beta*Ib=gain_beta*(Eo-Vbe)/(Ro+gain_beta*Re)

+// dividing numerator and denominator by gain_beta we get

+// Ic=(Eo-Vbe)/(Re+Ro/gain_beta)

+// Ro/gain_beta is negligible compared to Re so

+Ic=(Eo-Vbe)/Re

+Vce=Vcc-Ic*(Rc+Re)

+

+printf("the operating point is %.3f V and %.3f mA \n",Vce,Ic)

diff --git a/2459/CH12/EX12.12/Figure12_12.JPG b/2459/CH12/EX12.12/Figure12_12.JPG
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