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MP3 Player buid with STA015T decoder with AT89C51RB2 as microcontroller
This is build around the MP3 decoding chip from ST. This perticular design is aim for a portable system. However, the D/A chip used require 5V power supply, so a dual voltage inverter is required to boost the voltage from 2 AA cell to both 3.3V and 5V.
The power supply has not been designed yet. Currently, this design is working with bitstream up to 192kbit with SD memory and 128kbit with MMC.