Am Mi 26. März 2008 schrieb Marcus Bauer: > On Tue, 2008-03-25 at 18:58 -0700, steve wrote: > > > But onto your specifics: > > > > > > 4. Headsets. It’s a standard part. > > Hi Steve, > > I looked on the wiki pages but can't find the specs. As nokia headsets > with a 2.5mm plug don't work (different wiring and impedance) there are > apparently several standards for headsets. > > Can you tell us which wiring the jack uses and what impedance the > earplugs have?
[from a previous msg in this list] Am Di 4. März 2008 schrieb Gilles Casse: > Hi all, > > I am a little bit embarrassed: my audio headset is lost, another one > bought recently is not compatible (a 4 ring model for a Nokia, the [...] base = ground speaker left (internal impedance 33R) to ground. (+jackinsert detection) speaker right (internal impedance 33R) to ground. tip = mic electret condenser type, to ground. bias (power for mic) 2K2 from +3.3v(wolfson codec) (+HoldButton shortcircuit to ground) Due to the internal 33R resistors, any low impedance headset will not work (or only low sound). I guess 40R should be minimum impedance for the speakers. cheers jOERG _______________________________________________ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community