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I need a complete schematic and source code for audio recorder with microcontroller (PIC, AVR) that record voice on MMC with FAT format
 

Check out the dsPic family from Microchip. They have a Data Converter Interface (DCI) which allows simple connection to audio codecs. Search the application notes and you should find examples of all
the stuff you need.
 
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The most difficult part of ur project seems to be writing data to the MMC. As far as the audio is concerned , it can be easily handled by the A-D converter. Search for any MMC interface project and it will solve ur problem. U will never find the complete project.
 
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