initial commit / add all books

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diff --git a/1514/CH7/EX7.6/ch7_6.sce b/1514/CH7/EX7.6/ch7_6.sce
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+//chapter 7

+//example 7.6

+//page 206

+clear;

+clc ;

+//given

+fab=5; //common base cutoff frequency in MHz

+hfe=50; //common emitter current gain

+Cs=100; //load capacitor in pF

+Rc1=10; 

+Rc2=100; //collector capacitor in Kohm 

+

+//case 1

+fae=fab/hfe*10^3; //common emitter cutoff frequency in KHz

+//signal frequency

+fs1=(1/(2*%pi*Cs*Rc1)*10^6);

+if fae<fs1 then

+f2=fae;

+else 

+    f2=fs1;

+end

+printf('\nupper 3dB point for Rc1 is %d kHz',f2);

+

+//case 2

+fs2=(1/(2*%pi*Cs*Rc2)*10^6);

+if fae<fs2 then

+    f2=fae;

+else 

+    f2=fs2;

+end

+printf('\nupper 3dB point for Rc2 is %.1f kHz',f2);