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clear//
//Variables
VCC = 30.0 //Source voltage (in volts)
RC = 10.0 //Collector resistance (in kilo-ohm)
RE = 8.2 //Emitter resistance (in kilo-ohm)
RL = 3.3 //Load resistance (in kilo-ohm)
beta = 200.0 //Common emitter current gain
VBE = 0.7 //Emitter-to-Base Voltage (in volts)
R1 = 47.0 //Resistance (in kilo-ohm)
R2 = 15.0 //Resistance (in kilo-ohm)
Vs = 5.0 //a.c voltage (in milli-volts)
//Calculation
Vth = VCC * R2 / (R1 + R2) //Thevenin's voltage (in volts)
Rth = R1 * R2 / (R1 + R2) //Thevenin's equivalent voltage (in volts)
IE = (Vth - VBE)/(RE + Rth/beta) //Emitter current (in milli-Ampere)
r1e = 25.0 / IE //a.c. resistance of emitter diode (in ohm)
rL = RC * RL/(RC + RL) //a.c load seen by the amplifier (in kilo-ohm)
Av = rL * 10**3 / r1e //Voltage gain
vo = Av * Vs //Output voltage (in volts)
Ri = beta * r1e * 10**-3 //Input resistance looking directly into the base (in ohm)
Ris = Rth * Ri / (Rth + Ri) //input resistance of the stage (in ohm)
//Result
printf("\n a.c output voltage is %0.2f mV.\nInput impedance for the circuit is %0.0f kilo-ohm.",vo,Ris)
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