R1 = 22K, R2 = 2.2K, R3 = 1.5K, R4 = 120oHm, RL = 1K, C1 = 1uF, HFE = 200
i just made the calculation for this amplifier, but i suspect that it is not correct so hope someone can verify for me
Sorry for the noob question
for DC bias,
Rin = R1||R2||(Hfe*R4) = 1846ohm
VBQ1 = (R2/(R1+R2)*24v)-12v = -9.8V
VE = -VBQ1 - 0.7 = -10.5
IE = (12V+(-VE))/R4 = 12.5mA
VB2 = +12V - IE* R3 = -6.75V
VB3 = VB2 - (3*VBE) = -8.85V
VE2 = VB2 - VBE = -7.45
VE3 = VB3 + VBE = -8.15
Peak output current is 12V/RL = 12mA
the voltage gain is Rc/R4, where Rc = R3||((B+1)(r'eQ3+RL) = 1489
so Rc/R4 = 12.4
for a 4Vpeak to peak input signal, a peak input current are 2V/Rin = 1.08mA
so the total current gain is Peak output current/(2V/Rin) = 11.1
there are also few question i wanna ask
1) how to calculate the IE and IC for Q2 and Q3?
2) is that correct for the calculation of Rc = R3||((B+1)(r'eQ3+RL)?
3) how to calculate the maximum input signal voltage(rms) that avoid distortion for frequency of 10kHz? I know we use AC and DC load line to calculate for CE stage, but what for the whole circuit? or i just simply calculate the CE stage?