Pulster fixe(s) and rework

[Joerg Reisenweber]

Am Mi  4. März 2009 schrieb Helge Hafting:
> Joerg Reisenweber wrote:
> > Am So  11. Januar 2009 schrieb Alexandre Ghisoli:
> >> Le Sun, 11 Jan 2009 19:07:40 +0100,
> >> Konstantin <Chaosspawn23 at gmx.net> a écrit :
> >>
> >>> Matthias Apitz schrieb:
> >>>> Hello Christoph,
> >>>>
> >>>> Could you please also make an offer for the hardware buzz fix in DE:
> >>>> http://people.openmoko.org/joerg/GSM_EMI_noise/big-C_rework_SOP_rc2.pdf
> >>>> Would be great!
> >>>>
> >>>> Thx
> >>>>
> >>>> 	matthias (one of your happy GTA02 customers)
> >>> I second this one - offering the hardware fix for the freerunner
> >>> would be great :)
> >>>
> >>> Regards,
> >>> Konstantin (One of your other happy GTA02 customers ;) )
> >> Yes, hardware fixes (rework) made by resellers would be great.
> >>
> >> By fixes, I mean :
> >>
> >> * GPS - SDIO fix (add a capacitor if I remember correctly)
> > There's a sw-fix for that, which mostly "just works"
> > 
> >> * Add a GSM IR resistor for deep sleep 
> > Huh?
> > 
> >> * Change the led transistor power hungry stuff
> > Guys, this has been fixed for *ALL* FR ever sold!!!
> > 
> >> * fix the GSM buzz
> > ok, agree here.
> > 
> 
> If I ship the phone somewhere to have a technician fix the buzz, I 
> definitely want the "small capacitors on headset output" issue fixed too.
> 
> The capacitor, combined with the resistance of earphones, form a 
> high-pass filter.
> 
> The cutoff frequency is 1/(2*pi*R*C), where R is headphone resistance 
> and C is the size of the capacitor. The capacitor in the FR has been 
> reported as 1 microfarad. My headset is about 40 ohm, which gives a 
> cutoff frequency of about 4kHz.
> 
> At 4kHz the sound is halved, and drops by 6db per octave below that. 
> Above, the sound is almost normal. Unfortunately, most of the sound we 
> hear is below 4kHz.
> 
> A headset usually works down to about 20HZ. If I want the cutoff 
> frequency there, a 200 microfarad capacitor is needed.
> 
> Is there a plan for such a fix as well?
> 
> Helge Hafting

Hey, you copied my mail from ~1year ago ;-)
/j
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