I'm tring to build an audio amplifier. I decided to use a basic common emitter amplifier circuit as a starting point and added a speaker to it. I have some questions about the circuit. 1-) Is 2n2222 ok for this circuit? Results of DC analysis: Vce = 10.06V and Ic = 1.26mA (I guess, these values will be used for choosing the transistor.) 2-) What's the output voltage of a standart mp3 player? Can it be 300mVp as I read somewhere? 3-) When I assume ß = 150 and input = 300mVp , the output is -2,13Vp . I guess it gives 1w power to speaker. Is there something wrong? 4-) Is connecting speaker parellel to output R ok? Thank you..