Hi:
I have attempted to compute input impedance, output impedance, and voltage gain
for each stage and overall voltage gain for an audio amplifier circuit (schematic attached).
I did not attempt the output impedances because I am lost there.
The sim gives an overall voltage gain of 588, so I know that I have made at least one
error.
Schematic added by a moderator. Note: The missing component on the base of
Q3 is a pot.
My attempt:
aac
I have attempted to compute input impedance, output impedance, and voltage gain
for each stage and overall voltage gain for an audio amplifier circuit (schematic attached).
I did not attempt the output impedances because I am lost there.
The sim gives an overall voltage gain of 588, so I know that I have made at least one
error.
Schematic added by a moderator. Note: The missing component on the base of
Q3 is a pot.
My attempt:
r'e4 = 25.86 mV / IE4  1.019  Ω  
re4 = RE31║RL  0.001  KΩ  
Zin4(Base) = βac4 * (re'4 + re4)  0.202  KΩ  
Zin4 = Zin4(Base)  0.202  KΩ  
Zout4  ?  
Av4 = re4 / r'e4  0.981  
r'e2 = 25.86 mV / IE2  1.800  Ω  
rc2 = RB3║Zin4  0.168  KΩ  
Zin2(Base) = βac2 * (r'e2 + RE2)  11.112  KΩ  
Zin2 = RB2║Zin2(Base)  0.845  KΩ  
Zout2  ?  
Av2 = rc2 / (r'e2 + RE2)  1.650  
r'e1 = 25.86 mV / IE1  2.660  Ω  
rc1 = RC1║Zin2  0.458  KΩ  
Zin1(Base) = βac1 * (r'e1 + RE1)  100.266  KΩ  
Zin1 = RB1║Zin1(Base)  3.466  KΩ  
Zout1  ?  
Av1 = rc1 / r'e1  172.180  
Av(Total) = Av1 * Av2 * Av4  278.749  
Overall Voltage Gain Per Sim  588.000 
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