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.

"DESD2005" wrote in message
oups.com...
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?

I'd try the sci.electronics newsgroups.

Perhaps you need an IC to do this? Try looking he

http://www.analog.com/en/subCat/0,28...0%255F,00.html

Jeff