On Mon, 2009-08-10 at 20:06 +0400, Paul Fertser wrote: > David Fokkema <[email protected]> writes: > > On Sat, 2009-08-08 at 15:05 +0400, Paul Fertser wrote: > >> David Fokkema <[email protected]> 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 > > > > 0R's are placeholders for possible future modifications, right? Is the > > 1uF capacitor deliberately (but mistakenly) inserted or is this a > > manufacturing bug? > > The first :(
Hmmm... maybe the idea was to improve audio quality by inserting a filter? Too bad it didn't work out that way... > >> Unfortunately, there's no way to find out which devices are affected > >> by this bug judging only by revision and serial number as BOMs were > >> lost due to an incorrect file format conversion, one needs to actually > >> try and see for himself. > > > > If I open up my phone (have to do it someday, right?) how can I > > distinguish a 0R from a 1uF? > > Unlikely since those caps are under a can and dismounting it requires > extra effort and you can damage something doing it. How many cans are there inside a freerunner? I'll have to study the schematics and really have to open this thing. > > >> AFAICT A7s are affected while at least some A6s (mine e.g.) not. > > > > Hmmm... that's bad. > > > > Are there many differences like these? > > I don't know of anything important except those fake 0Rs and that the > bass was a bit improved in A7 (from 1uF to 4.7uF). If you're really > that interested, ask Joerg. Maybe I will, yes. Would be nice to have an exhaustive list. Probably this can also be found in the core project. Thanks, David _______________________________________________ Openmoko community mailing list [email protected] http://lists.openmoko.org/mailman/listinfo/community
