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+//chapter 8
+//example 8.4
+//page 301
+Toff=1;Ton=3;//given
+C=10*10^-6;//choosing 
+R2=Toff/(.693*C);//using eq Toff=.693RC
+disp(R2)//resistance
+//Ton=.693(R1+R2)C
+R1=(Ton/(.693*C))-R2;
+disp(R1)//required resistance
+\ No newline at end of file