Headset

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{{Languages|Headset}}
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The phone jack is a 2.5mm connector with four contacts: stereo + MIC. It is compatible with the headsets used by Motorola smartphones (A780,A1200, ...) and the V-360.
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To plug regular (i.e. without microphone) headphones commonly used to listen to music, a compatible 2.5mm 4 rings jack to 3.5mm stereo jack adapter is needed. It has been reported that Nokia's 2.5mm -> 3.5mm adapters do not work, but that a 3.5mm Stereo Audio Adapter for Motorola MPx200/E398 works well, as well as the generic Radio Shack 274-004. You will also want to switch from speaker output to headset, by restoring the appropriate alsa.state-file (usually the mediaplayer should do this for you) or via alsamixer (see below), to enable stereo output in there.
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== Pinout==
 
== Pinout==
 
There's a four-ring 2.5mm stereo jack which provides connectivity to old-fashioned wired headsets.
 
There's a four-ring 2.5mm stereo jack which provides connectivity to old-fashioned wired headsets.
 
The headsets used by Motorola smartphones (A780,A1200, ...) and the V-360 have a compatible configuration.
 
 
The headsets used by some Nokia phones (N95, ...) have the same jack but they are incompatible. For technical information about rewiring them visit [[Analog wired Headset Nokia]].
 
  
 
Pinout: [http://lists.openmoko.org/pipermail/community/2008-March/013792.html]
 
Pinout: [http://lists.openmoko.org/pipermail/community/2008-March/013792.html]
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       (+HoldButton shortcircuit to ground)
 
       (+HoldButton shortcircuit to ground)
 
</nowiki></pre>
 
</nowiki></pre>
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[[Image:AudioConnector.jpeg]] ( a drawing based on above description )
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This matches the reported pinout for the Blackberry Pearl [http://www.blackberryforums.com/hardware-accessories/78977-blackberry-audio-adapter-wiring-pinouts.html] but so far headset compatibility is unconfirmed. ( reading forum it seems right and left are reversed compared with freerunner ).
  
 
== Known working adapters ==
 
== Known working adapters ==
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 +
The headsets used by Motorola smartphones (A780,A1200, ...) and the V-360 have a compatible configuration. The HS-120 (Motorola) works without problems (mic untested).
  
 
{|cellspacing="5"  
 
{|cellspacing="5"  
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| [http://pc-mobile.net/audioadapter.htm pc-mobile.net]
 
| [http://pc-mobile.net/audioadapter.htm pc-mobile.net]
 
| Koss KSC-35 headphones, Altec Lansing inMotion iM4 speakers and car audio via AUX - all work great, if the mixer settings are changed like guided below. One can notice the lack of real quality sound with the headphones, but it's mostly fine for any casual listening. Definitely the output is not ideal/natural because of the high-pass filtering effect from the hardware issue and then artificially boosting low frequencies to compensate.
 
| Koss KSC-35 headphones, Altec Lansing inMotion iM4 speakers and car audio via AUX - all work great, if the mixer settings are changed like guided below. One can notice the lack of real quality sound with the headphones, but it's mostly fine for any casual listening. Definitely the output is not ideal/natural because of the high-pass filtering effect from the hardware issue and then artificially boosting low frequencies to compensate.
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|-
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| jth
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| 39691
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| [http://www.kjell.com/?item=39691 Kjell & Company Sweden]
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| Works for me. Probably even better if I fix the capacitors.
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|-
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| [[User:Lucky|Lucky]]
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| Motorola MPX200 Adapter
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| [http://www.sotmarket.ru/product/adapter_audio_moto_MPX200.html sotmarket.ru]
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| Works fine. Button is not tested. Tested with Sony Ericsson Headphones. The photos in the shop was incorrect, actual photos of this adapter: [http://picasaweb.google.com/lh/photo/0IdOHFFFGpPziAc7WyFSmA?feat=directlink 1] [http://picasaweb.google.com/lh/photo/u0fVDlj2n8ZHOavugKY11g?feat=directlink 2] [http://picasaweb.google.com/lh/photo/sZuery-iYXMumOrS9VTKIA?feat=directlink 3]
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|-
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| [[User:PWerken|PWerken]]
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| sku.3541
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| [http://www.dealextreme.com/details.dx/sku.3541 www.dealextreme.com]
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| It converts to stereo 3.5mm, so no microphone or button support. Some folks tried it but [http://lists.openmoko.org/pipermail/community/2010-March/060914.html only got audio from one ear], Dealextreme might have swapped in a different model.
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|-
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| sven1999
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| the OpenMoko headset
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| [http://pulster.de/index.htm?d__omheadset__OpenMoko_Headset994.htm www.pulster.de]
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| It seems to be the offical OpenMoko headset.
 
|-
 
|-
 
|}
 
|}
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== Incompatible, but rewireable headsets ==
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The headsets used by some Nokia phones (N95, ...) have the same jack but they are incompatible. For technical information about rewiring them visit [[Analog wired Headset Nokia]].
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The same is true for Headsets delivered with Sony Ericsson. Here is a short rewiring guide: [[Analog wired Headset Sony Ericsson]].
  
 
== Audio quality ==
 
== Audio quality ==
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===Test Case #1===
 
===Test Case #1===
  
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[[Category:Headsets| ]]
 
[[Category:Test]]
 
[[Category:Test]]

Latest revision as of 08:16, 26 September 2011

The phone jack is a 2.5mm connector with four contacts: stereo + MIC. It is compatible with the headsets used by Motorola smartphones (A780,A1200, ...) and the V-360.

To plug regular (i.e. without microphone) headphones commonly used to listen to music, a compatible 2.5mm 4 rings jack to 3.5mm stereo jack adapter is needed. It has been reported that Nokia's 2.5mm -> 3.5mm adapters do not work, but that a 3.5mm Stereo Audio Adapter for Motorola MPx200/E398 works well, as well as the generic Radio Shack 274-004. You will also want to switch from speaker output to headset, by restoring the appropriate alsa.state-file (usually the mediaplayer should do this for you) or via alsamixer (see below), to enable stereo output in there.

Contents

[edit] Pinout

There's a four-ring 2.5mm stereo jack which provides connectivity to old-fashioned wired headsets.

Pinout: [1]

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)

AudioConnector.jpeg ( a drawing based on above description )

This matches the reported pinout for the Blackberry Pearl [2] but so far headset compatibility is unconfirmed. ( reading forum it seems right and left are reversed compared with freerunner ).

[edit] Known working adapters

The headsets used by Motorola smartphones (A780,A1200, ...) and the V-360 have a compatible configuration. The HS-120 (Motorola) works without problems (mic untested).

Tester Product Seller How it works
TimoJyrinki MP35A pc-mobile.net  Koss KSC-35 headphones, Altec Lansing inMotion iM4 speakers and car audio via AUX - all work great, if the mixer settings are changed like guided below. One can notice the lack of real quality sound with the headphones, but it's mostly fine for any casual listening. Definitely the output is not ideal/natural because of the high-pass filtering effect from the hardware issue and then artificially boosting low frequencies to compensate.
jth 39691 Kjell & Company Sweden Works for me. Probably even better if I fix the capacitors.
Lucky Motorola MPX200 Adapter sotmarket.ru Works fine. Button is not tested. Tested with Sony Ericsson Headphones. The photos in the shop was incorrect, actual photos of this adapter: 1 2 3
PWerken sku.3541 www.dealextreme.com It converts to stereo 3.5mm, so no microphone or button support. Some folks tried it but only got audio from one ear, Dealextreme might have swapped in a different model.
sven1999 the OpenMoko headset www.pulster.de It seems to be the offical OpenMoko headset.

[edit] Incompatible, but rewireable headsets

The headsets used by some Nokia phones (N95, ...) have the same jack but they are incompatible. For technical information about rewiring them visit Analog wired Headset Nokia. The same is true for Headsets delivered with Sony Ericsson. Here is a short rewiring guide: Analog wired Headset Sony Ericsson.

[edit] Audio quality

You probably want to fix mixer settings to overcome the poor low-frequency output, see FreeRunner Hardware Issues for instructions.

[edit] Test Scope

To test Headset functionality

[edit] Test Duration

[edit] Test Environment

  1. Neo FreeRunner plus April Software Update
  2. FIC GTA02 battery
  3. SIM card
  4. Headset AP

[edit] Test Cases

[edit] Test Case #1

Personal tools

Pinout

There's a four-ring 2.5mm stereo jack which provides connectivity to old-fashioned wired headsets.

The headsets used by Motorola smartphones (A780,A1200, ...) and the V-360 have a compatible configuration.

The headsets used by some Nokia phones (N95, ...) have the same jack but they are incompatible. For technical information about rewiring them visit Analog wired Headset Nokia.

Pinout: [1]

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)

Known working adapters

Tester Product Seller How it works
TimoJyrinki MP35A pc-mobile.net  Koss KSC-35 headphones, Altec Lansing inMotion iM4 speakers and car audio via AUX - all work great, if the mixer settings are changed like guided below. One can notice the lack of real quality sound with the headphones, but it's mostly fine for any casual listening. Definitely the output is not ideal/natural because of the high-pass filtering effect from the hardware issue and then artificially boosting low frequencies to compensate.

Audio quality

You probably want to fix mixer settings to overcome the poor low-frequency output, see FreeRunner Hardware Issues for instructions.

Test Scope

To test Headset functionality

Test Duration

Test Environment

  1. Neo FreeRunner plus April Software Update
  2. FIC GTA02 battery
  3. SIM card
  4. Headset AP

Test Cases

Test Case #1