Sunday, 11 January 2015

transistors - Common Emitter Audio Amplifier


I'm tring to build an audio amplifier. I decided to use a basic common emitter amplifier circuit as a starting point. Here it is:


http://i.stack.imgur.com/03j4o.png


I have some questions about the circuit.


1-) What transistor can I use in 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?





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