Mono audio output on GTA02?

Al Johnson openmoko at
Fri Feb 8 23:33:48 CET 2008

On Friday 08 February 2008, Ben Burdette wrote:
> I was looking at the GTA02 hardware spec on the wiki, and its looking
> (to me) like mono only output.  According to this:
> The neo1973 has a stereo LM4857 amplifier, which drives the stereo
> speakers, mono earpiece, and (presumably stereo) headphones.  However,
> on the freerunner it appears that it has been changed to the LM4853
> instead, a mono amplifier.  That implies that the headphone output is
> now mono and not stereo.  Unless I'm missing something?

Look again at the LM4853 specs and you'll see that it takes stereo in and 
drives stereo headphone out or mono speaker out.

More information about the community mailing list