want to make an audio amplifier

[shaiqbashir]

Hi Guuys!

here is what i want to do!

I want to make an Audio Amplifier with the help of a BJT Transistor. What transistor will be suitable. I want to use 8ohm speakers. Secondly, tell me about the types of feedbacks i have to provide.

I shall be thankful if you will provide me good details.

Thanks and Good Bye!

 

[Decade]

Hi shaiqbashir!

Have you checked the project section at this forum?
Here is one of them

http://www.electronics-lab.com/projects/audio/017/index.html

 

[audioguru2]

Hi Shaiq,
Audio power amplifiers use usually complementary power transistors operating as emitter-followers at their output to provide enough current and symmetry.
DC negative feedback is used to provide a stable DC operating voltage and AC negative feedback is used to create a certain voltage gain, low distortion and wide bandwidth.

I don't think a single transistor can drive an 8 ohm speaker properly unless a transformer is used to couple it to the speaker. If a single transistor/transformer power amplifier is made, with a power output rating of only a few watts or more then the transistor will get very hot even without an output. ;D