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diff --git a/863/CH6/EX6.4/Ex6_4.txt b/863/CH6/EX6.4/Ex6_4.txt
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+//Caption:Calculate R1,R2 and Actual UTP and LTP
+//Ex6.4
+clc;
+clear;
+close;
+u=3//Upper trigger voltage(in volts)
+Ib=500//Max base current(in nA)
+Vcc=15//Collector voltage(in volts)
+i=Ib*0.1
+R2=u*1000/i
+I=u/R2
+Vo=Vcc-1
+Vr1=Vo-u
+R1=Vr1/I
+utp=Vo*R2/(R1+R2)
+ltp=-utp
+disp(ltp,utp,R2,R1,'Circuit components R1,R2(in kilo ohm) and actual UTP and LTP(in volts)=')
+\ No newline at end of file