3 files changed, 30 insertions, 0 deletions
diff --git a/339/CH8/EX8.11/ex8_11.JPG b/339/CH8/EX8.11/ex8_11.JPG
new file mode 100755
index 000000000..d60926909
--- /dev/null
+++ b/339/CH8/EX8.11/ex8_11.JPG
diff --git a/339/CH8/EX8.11/ex8_11.sce b/339/CH8/EX8.11/ex8_11.sce
new file mode 100755
index 000000000..c987a6e0f
--- /dev/null
+++ b/339/CH8/EX8.11/ex8_11.sce
@@ -0,0 +1,15 @@
+theta=(1:1:360)/180*%pi; //define conduction angle
+
+//compute efficiency
+nu=-1/2*(theta-sin(theta))./(theta.*cos(theta/2)-2*sin(theta/2)); 
+
+plot(theta/%pi*180,nu*100,'r','linewidth',2);
+set(gca(),"auto_clear","off");
+plot([0 180],[%pi/4*100 %pi/4*100],'b:');
+plot([180 180],[0 %pi/4*100],'b:');
+plot(180,%pi/4*100,'bo');
+plot(360,50,'bo');
+mtlb_axis([0 360 50 100]);
+title('Maximum theoretical efficiency of the amplifier');
+xlabel('Conduction angle \Theta_0, deg.');
+ylabel('Efficiency \eta, %');
+\ No newline at end of file
diff --git a/339/CH8/EX8.12/ex8_12.sce b/339/CH8/EX8.12/ex8_12.sce
new file mode 100755
index 000000000..21d6f69ac
--- /dev/null
+++ b/339/CH8/EX8.12/ex8_12.sce
@@ -0,0 +1,15 @@
+Ic=10*10^-3; //Collector current
+Vce=3;
+Vcc=5;
+beta=100; //current gain
+Vbe=0.8;
+I1=Ic+Ic/beta;
+R1=(Vcc-Vce)/I1;
+R2=(Vce-Vbe)/(Ic/beta);
+Vx=1.5;
+R3=(Vx-Vbe)/(Ic/beta);
+Ix=10*(Ic/beta);
+R11=(Vx/Ix);
+R22=(Vcc-Vx)/(Ix+(Ic/beta));
+R4=(Vcc-Vce)/Ic;
+disp("Amperes",I1,"I1","Ohms",R1,"R1","Ohms",R2,"R2","Ohms",R3,"R3","Ohms",R11,"R11","Ohms",R22,"R22","Ohms",R4,"R4");
+\ No newline at end of file