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clear//
//Variables
VCC = -18.0 //Source voltage (in volts)
RC = 4.3 //Collector resistance (in kilo-ohm)
RE = 1.0 //Emitter resistance (in kilo-ohm)
beta = 200.0 //Common emitter current gain
VBE = -0.7 //Emitter-to-Base Voltage (in volts)
R1 = 39.0 //Resistance (in kilo-ohm)
R2 = 8.2 //Resistance (in kilo-ohm)
RL = 3.0 //Load resistance (in kilo-ohm)
//Calculation
Vth = VCC * R2 / (R1 + R2) //Thevenin's voltage (in volts)
Rth = R1 * R2 / (R1 + R2) //Thevenin's equivalent voltage (in volts)
IC = (Vth - VBE)/(RE + Rth/beta) //Collector current (in milli-Ampere)
IE = -IC //Emitter current (in milli-Amper)
r1e = 30.0/IE * 10**-3 //a.ac resistance (in kilo-ohm)
Ris = Rth * beta*r1e/(Rth + beta*r1e) //input resistance of the stage (in ohm)
rL = RC * RL / (RC + RL) //a.c. load resistance (in kilo-ohm)
Av = rL / r1e //Voltage gain
//Result
printf("\n Voltage gain is %0.1f .",Av)
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