[sound]: capacitor that act like a high-pass filter and so removes the bass on the headphones jack
zerghase at in4matiker.de
Wed Nov 26 13:58:45 CET 2008
Can someone please explain, how such an adapter had to look like (maybe a
diagram), because I'd like to build one. I think in most cases, people will
use an adapter
from the 2.5mm to a 3.5mm jack anyway.
Will the audio quality be equal with an adapter to the hw fix? If not, is
there a description
of a hw fix for it (Joerg, you say there are different ways, so i assume you
done or at least designed one)?
Joerg Reisenweber wrote:
> Yes, sounds like a good idea (input impedance should be (much) > [>]
> though, not <1k)
> This adapter also could implement some hw-equalization for the
> created by the 1uF*(1/(1/1k + 1/(33R + adapter-impedance)). (where, in
> sequence, values are from: C4111:1u, R4117:1k, R4407:33R. Right channel
> Requests for assistance welcome.
> Am So 16. November 2008 schrieb Scott Carlson:
>> Would also be possible to create a small inline adapter for head set that
>> have <1k input impedance? It may be convenient to make a batch and sell
>> cheap? (As a non-intrusive) hw fix.?
>> > Sorry the audio is definitively broken due to the capacitor issue
>> > mentioning. There is no sw-fix either.
>> > You may get (semi)decent audio by:
>> > o- using a home-stereo line in, which has >1k input impedance
>> > o- using high impedance headphone (>600 Ohm)
>> > o- do a rework on the capacitors (there are different ways to do that,
>> > need excellent soldering skills)
>> > o- use a bt-headset
>> > very sorry I didn't achieve to fix this for MP yet
>> > cheers
>> > jOERG
>> > _______________________________________________
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>> > hardware at lists.openmoko.org
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