DIY Audioadaptor

Thomas Hauth Thomas.Hauth at
Wed Oct 29 09:12:53 CET 2008

I bought an adapter at the local electronics store ( "Saturn" in 
Germany). It fits pretty well into the FR socket. But I only have sound 
on one side of the headset, even if the pluf is fully connected. I'm not 
sure if this is a plug-related problem or a misconfiguration of the 
moko-audio-subsystem. Does anybody know more about this? If I'm not able 
to fix this via software configuration, I plan to connect the 2 stereo 
channels by soldering to at least have a mono signal on both earplugs.


Marcel schrieb:
> There's a notice on the wiki about a working adaptor I also own - didn't 
> notice significant quality decrease with it and it works well. Just to 
> possibly save you from soldering (although I know its fun). :)
> -Marcel
> Am Tuesday 28 October 2008 21:34:47 schrieb Thomas Köckerbauer:
>>> I was about to solder myself an adaptor to use my headphones with the
>>> FreeRunner as an ogg/flac player. I have found some jacks, which seem to
>>> good for this task (german website):
>>> 78 4
>>> 78 5
>>> 10
>>> Now I wonder, whether
>>> a) the jack inside the fr is compatible to the ones of reichelt?
>> I bought this connector:
>> template=pcat_product_details_document&product_show_id=730520&no_brotkrumenn
>> avi=1&zhmmh_area_kz=LN It does not fit very well. The metal-base of the
>> connector has a to large diameter. Since the headset socket of the
>> Freerunner is a bit inside of the case the connector has only full contact
>> if I press in the connector really hard (the case caves in a bit). As soon
>> as I stop pressing the plug goes back outside a bit again and looses
>> contact again. So you have to make sure that the base of the connector is
>> not to large (this is somewhat similar to the headset connector problem
>> that was there at the first iPhone).
>> Maybe as a suggestion for improvement for further OpenMoko phones would be
>> that the headset socket should be not be to far in the device.
>> I'm now thinking about buying a Nokia headset and making an adapter out of
>> it, since those have plugs that are normally smaller than those for
>> self-soldering.
>>> b) I just need to connect the jacks with a proper cable or do I have to
>>> solder some resistor, capacitor or sth, different in between to work
>>> around the bad sound quality some people have noticed?
>> I did not add anything in between. I can't complain about the audio quality
>> (I've also read those reports about bad sound quality, but I did not really
>> notice anything).
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