I need to build a class A audio amplifier with the following specifications
Output power: (1,3,5) W output through an (4,8) Ω load
Frequency response: ± 0.5 dB from 100-15 kHz
Efficiency:efficiency greater than 30 % maximum (when the ouput is dc)
I dont have much idea regarding amps, any help appreciated, say a ckt diagram.
Any help appreciated
R3 provides dc bias for Q1 (from voltage divider R1/R2) ..
R6 (alone) dc feedback to Q1 ..
R6/R7/C6 ac negative feedback, where C6 just cuts off dc component ..
In other words, R6/R7 set the amplifier’s gain ..
R10 works like a fuse ..
R8/R9 set dc condition for the dynamic load based on Q2 ..
And that should be it ..
Rgds,
IanP