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i want to make a 10 watt amplifier , which can play songs from a USB Flash Drive ......... Answered

please provide me with the circuit and list of materials required

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No way. You need an MP3 player in there somewhere. If you have to ask this question, you can't build an MP3 player.....

Steve

ok then please tell me how to make the mp3 player ....
with circuit diagram

You can take a look at this chip
http://www.atmel.com/dyn/resources/prod_documents/doc7524.pdf

This is the starting point. I am not sure if it operates in USB host mode - which it has to do to talk to your USB drive.