Help needed in Portable audio player.....

[gauravsarode]

Hi,

I want to build Portable audio player which can play wave files from MMC (MultiMedia Card).The interfacing part of microcontroller and MMC is done. I am stuck with playing part.The application I made which reads from MMC and out it on microcontroller's PORT parallelly at 8khz since my wave file is sampled at 8khz.

Here is the problem part. I want to build DAC and audio filter.Can anyone suggest me any Ic which can be used as DAC and filter as well as amplifier or any two of these. Currently I am using simple R-2R ladder,RC filter and LM386 as amplifier.But in my case audio sound is very noisy.Can someone help me?

Thanks and regards,
Gaurav Sarode.

 

[mgf]

Hi gauravsarode,

you can use PWM as well as they use in this module, **broken link removed** which is about similar with what you want to achieve. I have tested one and it sounds ok.

As for parralel output, you can try MAX5100 **broken link removed** .

Are you using some kind of file system, or the sounds are stored like raw ?

Regards,
mgf