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diff --git a/226/CH19/EX19.4/example4_sce.sce b/226/CH19/EX19.4/example4_sce.sce
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+//chapter 19
+//example 19.4
+//page 821
+printf("\n")
+printf("given")
+N1=60;N2=10;Rl=16;Rpy=0;R6=56;Vcc=27;Vce=.5;n=.79;
+disp(" Referred laod")
+rl=(N1/N2)^2 *Rl
+disp(" tatol ac load line in series with each of Q2 and Q3")
+Rl=rl+R6+Rpy
+disp(" peak primary current")
+Ip=(Vcc-Vce)/Rl
+disp("peak primary voltage")
+Vp=Vcc-Vce-(Ip*R6)
+disp("power delivered to primary")
+Po=.5*Vp*Ip
+disp(" power delivered  to the load")
+Po=Po*n//n is power efficiency