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diff --git a/1850/CH7/EX7.12/exa_7_12.sce b/1850/CH7/EX7.12/exa_7_12.sce
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+// Exa 7.12
+clc;
+clear;
+close;
+//given data
+T= 100;// in micro sec
+T=T*10^-6;//in se
+V_sat= 12;// in volt
+V1= 0.7;// in volt
+V= 0.7;// in volt
+V_D1= V;
+V_D2=V_D1;
+C1= 0.1;// in microF
+C1=C1*10^-6;// in F
+Bita1= 0.1;
+// Formula T= R3*C1*log((1+V1/V_sat)/(1-Bita1))
+R3= T/(C1*log((1+V1/V_sat)/(1-Bita1)));// in ohm
+disp(R3*10^-3,"Value of R3 in kohm")