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clear//
//Variables
VCC = 12.0 //Source voltage (in volts)
RC = 4.0 //Collector resistance (in kilo-ohm)
RE = 3.3 //Emitter resistance (in kilo-ohm)
beta = 120.0 //Common emitter current gain
VBE = 0.7 //Emitter-to-Base Voltage (in volts)
R1 = 60.0 //Resistance (in kilo-ohm)
R2 = 30.0 //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)
IE = (Vth - VBE)/(RE + Rth/beta) //Emitter current (in milli-Ampere)
r1e = 25.0 / IE * 10**-3 //a.c. resistance of emitter diode (in kilo-hm)
rL = RC //Load resistance (in kilo-ohm)
Av = RC / r1e //Voltage gain
//Result
printf("\n The voltage gain is %0.1f .",Av)
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