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diff --git a/863/CH12/EX12.1/Ex12_1.txt b/863/CH12/EX12.1/Ex12_1.txt
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+++ b/863/CH12/EX12.1/Ex12_1.txt
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+//Caption: Determine fan out for DTL NAND gate 
+//Ex12.1
+clc;
+clear;
+close;
+hfe=20
+Vbe=0.7//Base emitter voltage(in volts)
+R3=6//Resistance(in kilo ohm)
+R2=5//Resistance(in kilo ohm)
+Vcc=5//Supply voltage(in volts)
+R1=2//Resistance(in kilo ohm)
+Vce=0.2//Collector emitter voltage(in volts)
+Vf4=0.7//Diode forward voltage
+Vf5=Vf4
+Vf6=Vf4
+I2=Vbe/R2
+Va=Vf4+Vf5+Vbe
+I1=(Vcc-Va)/R1
+Ib=I1-I2
+Ic1=hfe*Ib
+I3=(Vcc-Vce)/R3
+Iol=Ic1-I3
+R4=R1
+Iil=(Vcc-Vf6)/R4
+fo=Iol/Iil
+disp(fo,'Fan out=')
+\ No newline at end of file