initial commit / add all books

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diff --git a/2498/CH6/EX6.m.21/ex_m_6_21.sce b/2498/CH6/EX6.m.21/ex_m_6_21.sce
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+// Exa Misc. 6.21

+clc;

+clear;

+close;

+format('v',6)

+// Given data

+i1 = 1;//input current for first op-amp in mA

+i1 = i1 * 10^-3;// in A

+R_F = 1;// in k ohm

+R_F = R_F * 10^3;// in ohm

+// Output voltage at first op-amp stage

+Vo = -i1*R_F;// in V

+R1 = 10;// in k ohm

+R2 = 1;// in k ohm

+// The output voltage,

+Vg1 = Vo*(1+(R1/R2));// in V

+disp(Vg1,"The output volatge in V is");