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clear//
//Variables
VCC = 12.0 //Source voltage (in volts)
RC = 10.0 * 10**3 //Collector resistance (in ohm)
RE = 1.0 * 10**3 //Emitter resistance (in ohm)
RB = 500.0 * 10**3 //Base resistance (in ohm)
beta = 50.0 //Common emitter current gain
//Calculation
IC = VCC / (RE + RB/beta) //Collector current (in Ampere)
IE = IC //Emitter current (in Ampere)
r1e = 25.0 / IE * 10**-3 //a.c. resistance of emitter diode (in ohm)
Ri = beta * (r1e) //Input resistance looking directly into the base (in ohm)
Ris = RB * Ri / (RB + Ri) //Input resistance of the stage (in ohm)
Av = RC / r1e //Voltage gain
AV1 = RC / RE //New voltage gain
//Result
printf("\n Input resistance looking into the base is %0.0f ohm.\nInput resistance of the stage is %0.1f kilo-ohm.\nVoltage gain is %0.2f .\nNew Voltage gain is %0.3f .",Ri,Ris,Av,AV1)
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