power amplifiers

[sandy23]

hey am looking for anyone who could help me in the circutory and list of components to build an 8ohm or 4ohm power amplifier with the darlington pair as an output.also additional info on why the quasi complementary is discarded nowadays.its a school project

 

[davenn]

Hi sandy, welcome to the forums

what sort of power levels ? mono or stereo ? Line level or mic level or both inputs ?

have you searched on google yet, there are masses of circuit ideas on there
find some ccts on there and show us links to them. Us guys here can then help with recommendations on which ccts are good or bad

cheers
Dave

 

[barathbushan]

why the quasi complementary is discarded

This might be because of high transient noise , low efficiency , and poor symmetry at the crossover region

 

[sandy23]

thanks so much to u all
Dave will try.i got some......
am thinking of working with a 4ohm load to generate 50w for audio
any ideas on which is the best circuit to build power amplifiers with??
am currently going with class AB because of its advantages

 

[davenn]

ok here's a respectable choice...

its a stereo amp module LM3886TF
http://www.national.com/mpf/LM/LM3886.html#Overview
easy 50W into 4 Ohm load

I suggest a IC type amplifier as it will drastically reduce component count and complexity of your circuit compared to a discrete transistor amplifier
These chips are only ~ $17.00 in Australia

D