3 files changed, 39 insertions, 0 deletions
diff --git a/2459/CH13/EX13.3/Ex13_3.JPG b/2459/CH13/EX13.3/Ex13_3.JPG
new file mode 100644
index 000000000..ead76736b
--- /dev/null
+++ b/2459/CH13/EX13.3/Ex13_3.JPG
diff --git a/2459/CH13/EX13.3/Ex13_3.sce b/2459/CH13/EX13.3/Ex13_3.sce
new file mode 100644
index 000000000..5ecf2a54d
--- /dev/null
+++ b/2459/CH13/EX13.3/Ex13_3.sce
@@ -0,0 +1,39 @@
+// chapter 13
+// example 13.3
+// page 278
+
+Vcc=15 // V
+Re=2 // kilo ohm
+Rc=1 // kilo ohm
+Rl=1 // kilo ohm
+Vbe=0.7 // V
+
+// dc load line
+
+    // when Ic=0, Vce=Vcc i.e. Vce=15 and when Vce=0, Ic=Vcc/(Rc+Re) i.e. Ic=15/3
+    // so equation of load line becomes Ic=-(1/3)*Vce+15
+
+       clf()
+    x=linspace(0,15,5)
+    y=-(1/3)*x+5
+    plot2d(x,y,style=3,rect=[0,0,16,6])
+    xtitle("dc load line-green         ac load line-blue","collector emitter voltage(volts)","collector current(mA)")
+
+    V2=5 // V
+    // since voltage across R2 is V2=5 V and V2=Vbe+Ie*Re we get
+    Ie=(V2-Vbe)/Re
+    Ic=Ie
+    Vce=Vcc-Ic*(Rc+Re)
+
+    printf("the operating point is %.3f V and %.3f mA \n",Vce,Ic)
+
+
+// ac load line
+    
+    R_AC=Rc*Rl/(Rc+Rl) // ac load
+    V_ce=Vce+Ic*R_AC // maximum collector emitter voltage
+    I_c=Ic+Vce/R_AC // maximum collector current
+    // the equation of ac load line in terms of V_ce and I_c becomes
+    y=-(I_c/V_ce)*x+I_c
+     plot2d(x,y,style=2,rect=[0,0,10,20])
+    
diff --git a/2459/CH13/EX13.3/Figure13_3.jpg b/2459/CH13/EX13.3/Figure13_3.jpg
new file mode 100644
index 000000000..d93fb71bb
--- /dev/null
+++ b/2459/CH13/EX13.3/Figure13_3.jpg