Well you could start simply by using an R2R ladder.
It all depends on how long and what quality you wish to play the audio at.

AFAIK all the MP3 players use a PIC, MPEG2 Decoding chip and some memory

Regards
Allan

----- Original Message -----
From: "Edson Brusque" <brusque@FLYNET.COM.BR>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: 30 December 1999 20:58
Subject: WAV and MP3 playback from a PIC


> Hello,
>
>     I need to make a little gizmo to play an audio file with a PIC. I
could
> use an external DAC. MP3 would be better, but WAV would also be
acceptable.
> Preferably 16 bits. Anyone have done this? Any suggestion about an
external
> EEPROM - above 1MB, preferably IIC - I could use?
>
>     Best regards,
>
>     Brusque