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diff --git a/1217/CH4/EX4.12/Exa4_12.sce b/1217/CH4/EX4.12/Exa4_12.sce
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+//Exa 4.12
+clc;
+clear;
+close;
+// given data
+RF=10;//in Kohm
+R1=10;//in Kohm
+R2=R1;//in Kohm
+R3=R1;//in Kohm
+R5max=50;//in Kohm
+ADmin=5;//unitless
+ADmax=200;//unitless
+//Formula : ADmin=1+2*R4/R5max
+R4=(ADmin-1)*(R5max/2);//in Kohm
+//Formula : ADmax=1+2*R4/R5min
+R5min=(2*R4)/(ADmax-1);//in Kohm
+disp("Thus design values of resistors in Kohm are :");
+disp(R1,"R1");
+disp(R2,"R2");
+disp(R3,"R3");
+disp(R4,"R4");
+disp(RF,"RF");
+disp(R5min,"R5min");
+disp(R5max,"R5max");
+\ No newline at end of file