Multistage Transistor Audio Amplifier Circuit

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