[sound]: capacitor that act like a high-pass filter and so removes the bass on the headphones jack

[zerghase]

Can someone please explain, how such an adapter had to look like (maybe a
circuit
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
have already
done or at least designed one)?

Sincerely,
zerghase


Joerg Reisenweber wrote:
> 
> Yes, sounds like a good idea (input impedance should be (much) > [&GT]
> 1000Ohm 
> though, not <1k)
> This adapter also could implement some hw-equalization for the
> highpass-filter 
> 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 
> analogue)
> 
> Requests for assistance welcome.
> cheers
> jOERG
> 
> 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
>> them
>> cheap? (As a non-intrusive) hw fix.?
>> 
>> SCarlson
>> 
>> 
>> >
>> > Sorry the audio is definitively broken due to the capacitor issue
>> you're
>> > 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,
>> all
>> > need excellent soldering skills)
>> > o- use a bt-headset
>> >
>> > very sorry I didn't achieve to fix this for MP yet
>> > cheers
>> > jOERG
>> >
>> > _______________________________________________
>> > hardware mailing list
>> > hardware at lists.openmoko.org
>> > http://lists.openmoko.org/mailman/listinfo/hardware
>> >
>> >
>> 
> 
> 
> 
>  
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> 

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