Rene Harder wrote: > Rene Harder wrote: > >> Joerg Reisenweber wrote: > >>> we should replace (A)-R4305-(B) by (A)-R4305-(X), (X)-C4306_NC-(GND), > >>> (X)-R4399_0R-(B) > >>> move C4303, C4304, R4305 next to wm8753, behind B3005 > >>> > > I think that's a really good idea. In this configuration you completely > > prevent RF from getting into MICBIAS through JK4401. > > > I rewrote ECN0019 to reflect those changes and reopened it for further > discussions.
Hmm, I think this is quite different from what Joerg had in mind. Here's my attempt at making sense of it: http://svn.openmoko.org/trunk/gta02-core/docs/ecn/ecn0019/swap.ps Note that this drawing doesn't include ECN0042 or ECN0043. Also, the description of how the the buzz fix works isn't quite correct - it's not blocking RF noise coming from the microphone, but it's filtering the (audio frequency) buzz already riding on MICBIAS, originating from the jack. - Werner _______________________________________________ gta02-core mailing list [email protected] https://lists.openmoko.org/mailman/listinfo/gta02-core
