initial commit / add all books

1 files changed, 32 insertions, 0 deletions

diff --git a/3754/CH26/EX26.8/26_8.sce b/3754/CH26/EX26.8/26_8.sce
new file mode 100644
index 000000000..5b8dc23c8
--- /dev/null
+++ b/3754/CH26/EX26.8/26_8.sce
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+clear//

+

+//Variables

+

+VCC = 10.0                        //Source voltage (in volts)

+RE = 1.5 * 10**3                  //Emitter resistance (in ohm)

+R1 = 30.0 * 10**3                 //Resistance (in ohm)

+R2 = 20.0 * 10**3                 //Resistance (in ohm)

+beta1 = 150.0                     //Common emitter current gain

+beta2 = 100.0                     //Common emitter current gain

+VBE = 0.7                         //Emitter-to-base voltage (in volts)

+

+//Calculation

+

+Ai = beta1 * beta2                //Overall current gain of transistor

+VR2 = VCC * R2/(R1 + R2)          //Voltage across resistor2 (in volts)

+VB2 = VR2 - VBE                   //Voltage at the base of Q2 (in volts)

+VE2 = VB2 - VBE                   //Voltage at the emitter of Q2 (in volts)

+IE2 = VE2 / RE                    //Emitter current of Q2 (in Ampere)

+r1e2 = 25.0/IE2 * 10**-3          //a.c. emitter diode resistance of Q2 (in ohm)

+IB2 = IE2 / beta2                 //Base current of Q2 (in Ampere)

+IE1 = IB2                         //Emitter current of Q2

+r1e1 = 25.0/IE1 * 10**-3          //a.c. emitter diode resistance of Q1 (in ohm)   

+Ri1 = R1 * R2/(R1 + R2)           //Total input resistance (in ohm)

+Av = RE/(r1e1/beta2 + r1e2 + RE)  //Overall voltage gain

+

+//Result

+

+printf("\n The overall current gain is  %0.3f .",Ai)

+printf("\n The a.c. emitter diode resistance of Q1 transistor is  %0.1f  ohm.\nThe a.c. emitter diode resistance of Q2 transistor is  %0.2f  ohm.",r1e1,r1e2)

+printf("\n Total input resistance is  %0.3f  kilo-ohm.",Ri1 * 10**-3)

+printf("\n Overall voltage gain is  %0.2f .",Av)