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diff --git a/74/CH12/EX12.9/example9_sce.sce b/74/CH12/EX12.9/example9_sce.sce
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+//chapter 12
+// example 12.9
+// page 428
+t1=83.33;
+Vr=100*10^-3;//reference voltage
+Vi=100*10^-3;
+t2=(Vi/Vr)*t1;
+disp(t2)
+Vi=200*10^-3;
+t2=(Vi/Vr)*t1;
+disp(t2)//is in msec
+\ No newline at end of file