Freerunner audio channels

Al Johnson openmoko at mazikeen.demon.co.uk
Mon Aug 10 15:15:59 CEST 2009


On Monday 10 August 2009, David Fokkema wrote:
> On Mon, 2009-08-10 at 15:53 +0400, Paul Fertser wrote:
> > Alexander Shulgin <alex.shulgin at gmail.com> writes:
> > > On Sat, Aug 8, 2009 at 14:05, Paul Fertser<fercerpav at gmail.com> wrote:
> > >> David Fokkema <dfokkema at ileos.nl> writes:
> > >>> The fact that Freerunners differ in audio quality and settings has
> > >>> been stated on this list and on support. And going by the last
> > >>> paragraph, this is true.
> > >>>
> > >>> So, _why_ are Freerunners different?
> > >>
> > >> One of the problems is that some freerunner revisions are in fact
> > >> different in hardware. Most devices have 1uF capacitors instead of
> > >> R3004/R3005 (which should be 0R), and that's not a joke. That is
> > >> earpiece path and not surprisingly that devices that have those
> > >> capacitors have considerably lower sound volume from the earpiece.
> > >
> > > And what do I do if I happen to have one?
> >
> > Tweak alsa state files appropriately. There's a routing diagram on the
> > wiki that explains everything needed.
>
> If that doesn't really cut it, is it possible to swap the 1uF for a 0R?
> Gotta make a list of hardware fixes to perform, ;-)

If you need to ask you probably can't do it yourself ;-) Schematics and 
component layout are available, and shorting a cap shouldn't be too hard. The 
components are small, and not far from the headset coupling caps. See sheet 3 
of the component layout under the bottom right corner of U3001.



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