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+//chapter 7
+//example 7.7
+// page 286,figure 7.42
+R1=10000;R2=10000;
+Vd1=.7;//diode drop
+Vsat=12;//supply voltage
+TP=2*10^-6;
+C=.5*10^-9;
+B=R1/(R1+R2)
+//T=RCln((1+Vd1/Vsat)/(1-B))
+k=((1+(Vd1/Vsat))/(1-B))
+h=log(k)
+R=TP/(C*h)
+\ No newline at end of file