Multistage Transistor Audio Amplifier Circuit
https://www.youtube.com/watch?v=LJrL9N9uhkE
c1=c2=c3 coupling capacitor >= 1000uf
Xc =1/2 phi fc
as frequency goes up Xc goes down.
if you want to amplify low frequency use large value for C1 C2 and C3 will have to be a large value
F = 100hz
100 uf then Xc = 15.9 ohms inpendence
1000 uf then Xc =1.5 ohms impedence
Large capacitor will allow low frequency to pass thru
20hz to 20Khz
1stage
R1 and R2 use to decrease input voltage
R3 and R4 voltage divider
R3=500K 100K
hfe = B = ic/ib =100-300 = Current Gain of Transister
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