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clear//
//Variables
VCC = 10.0 //Source voltage (in volts)
RC = 5.0 //Collector resistance (in kilo-ohm)
rE = 500 * 10**-3 //Emitter resistance (in kilo-ohm)
beta = 50.0 //Common emitter current gain
VBE = 0.7 //Emitter-to-Base Voltage (in volts)
R1 = 50.0 //Resistance (in kilo-ohm)
R2 = 10.0 //Resistance (in kilo-ohm)
Vs = 100.0 * 10**-3 //a.c voltage (in volts)
RS = 600.0 * 10**-3 //Source resistance (in kilo-ohm)
RL = 50.0 //Load resistance (in kilo-ohm)
RE1 = 500.0 * 10**-3 //Resistance (in kilo-ohm)
//Calculation
Vth = VCC * R2 /(R1 + R2) //Thevenin's voltage (in volts)
Rth = R1 * R2 / (R1 + R2) //Thevenin's equivalent resistance (in kilo-ohm)
RE = RE1 + rE //Emitter total resistance (in kilo-ohm)
IE = (Vth - VBE)/(RE + Rth/beta) //Emitter current (in milli-Ampere)
r1e = 25.0 / IE * 10**-3 //a.c. resistance (in kilo-ohm)
Ri = beta * (rE + r1e) //Input resistance directly into the base (in kilo-ohm)
Ris = Rth * Ri/(Rth + Ri) //Input resistance of the stage (in kilo-ohm)
rL = RC * RL / (RC + RL) //a.c. load resistance (in kilo-ohm)
Av = rL/(rE + r1e) //Voltage gain
Avs = Av * Ris / (RS + Ris) //Overall voltage gain
Vo = Avs * Vs //Output voltage (in volts)
//Result
printf("\n Input resistance looking directly into the base is %0.1f kilo-ohm.\nInput resistance of the stage is %0.2f kilo-ohm.\nVoltage gain is %0.3f .\nOverall voltage gain is %0.2f .\nOutput voltage is %0.2f V.",Ri,Ris,Av,Avs,Vo)
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