1 files changed, 24 insertions, 0 deletions
diff --git a/226/CH20/EX20.2/example2_sce.sce b/226/CH20/EX20.2/example2_sce.sce
new file mode 100755
index 000000000..cac6041d4
--- /dev/null
+++ b/226/CH20/EX20.2/example2_sce.sce
@@ -0,0 +1,24 @@
+//chapter 20
+//example 20.2
+//page 905
+printf("\n")
+printf("given")
+Vs=30;Vd1=.7;Vg=.8;Ig=200*10^-6;
+Vspk=1.414*Vs
+disp(" at 5 degree")
+es=Vspk*.087//  sin5=.087
+disp(" at 90 degree")
+es=Vspk
+Vt=Vd1+Vg
+disp(" to trigger at es=3.7V the R2 moving contact is at the top")
+es=3.7;
+Vr1=es-Vt
+I1=1*10^-3;
+R1=Vr1/I1
+R=Vt/I1//R=R2+R3
+disp(" to trigger at es =42.4 the R2 moving contact at the bottom")
+es=42.4;
+Vr3=Vt;
+I1=es/(R+R1)
+R3=Vt/I1
+R2=R-R3
+\ No newline at end of file