1 files changed, 23 insertions, 0 deletions
diff --git a/3754/CH20/EX20.13/20_13.sce b/3754/CH20/EX20.13/20_13.sce
new file mode 100644
index 000000000..59504e9a4
--- /dev/null
+++ b/3754/CH20/EX20.13/20_13.sce
@@ -0,0 +1,23 @@
+clear//
+
+//Variables
+
+VO=5.0;VL=5.0;
+IL = 20.0                         //Load current (in milli-Ampere)
+PZmax = 500.0                     //Maximum power dissipation in zener (in milli-watt)
+VSmin = 9.0                       //Minimum source voltage (in volts)
+VSmax = 15.0                      //Maximum source voltage (in volts)
+VZ = 5
+IZ =20
+//Calculation
+
+IZmax = PZmax / VZ                //Maximum zener current (in milli-Ampere)
+ISmax = IL + IZ                   //Maximum input current (in milli-Ampere)
+RSmin = (VSmax - VZ)/(IZmax + IL) //Minimum value of regulating resistance (in kilo-ohm)
+IZ = (VSmin - VZ)/ RSmin - IL     //Minimum value of zener current           
+
+//Result
+
+printf("\n Input varies from the normal 12 v within the range of +- 3 V.")
+printf("\n Zener current vary from  %0.3f  mA to  %0.3f  mA.",IZ,IZmax)
+printf("\n For safety purpose RS should be 220 ohm.")