Simple 2.0 Audio Amplifier Circuit Diagram with USB Reader Integration Request

please send me some simple 2.0 or more version audio amplifier with usb reader circuit diagram.. to this email id:- mmshafeeq(_at_)gmail.com
i have some douts in usb circuits

can u help me?

Do you mean: audio amplifier that is _powered_ by a USB port?

What kind of audio amplifier?

* Mono/Stereo/? ?
* Linear, class-D, etc.
* To drive what: headphones, small speakers, large speakers, your eardrums (directly), singing flames, thunder clouds (modulated lightening)
* From what kind of input: microphone (what kind), line-in, phonograph needle, hydrophone, electric eel, piezoelectric tap shoes, God's tonsils???

Or did you mean to send an audio signal up a USB port, in which case, you're making no sense.

Or, maybe you meant interfacing digital audio to a USB port, no?

And, what are your "doubts in USB circuits"?

Is what you want to build your own MP3 player perhaps ?
Or can you describe the device you want to build ?
What do you want it to do ?