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diff --git a/3507/CH15/EX15.9/Ex15_9.sce b/3507/CH15/EX15.9/Ex15_9.sce
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+//chapter15
+//example15.9
+//page331
+
+Vcc=17.5 // V
+ic_max=35d-3 // ampere
+ic_min=1d-3 // ampere
+IC=18 // ampere
+gain=100
+vce_max=30 // V
+vce_min=5 // V
+Rl=81.6 // ohm
+
+IC=ic_min+((ic_max-ic_min)/2)
+IB=IC/gain
+VCE=vce_min+((vce_max-vce_min)/2)
+
+Pdc=Vcc*IC
+Vce=(vce_max-vce_min)/(2*2^0.5)
+Ic=(ic_max-ic_min)/(2*2^0.5)
+Pac=Vce*Ic
+
+eta=(Pac/Pdc)*100
+
+slope=(ic_max-ic_min)/(vce_min-vce_max)
+Rl_dash=-1/slope
+n=(Rl_dash/Rl)^0.5
+
+printf("zero signal collector current = %.3f mA \n",IC*1000)
+printf("zero signal base current = %.3f mA \n",IB*1000)
+printf("dc power = %.3f mW and ac power = %.3f mW \n",Pdc*1000,Pac*1000)
+printf("collector efficiency = %.3f percent \n",eta)
+printf("transformer turn ratio = %.1f \n",n)