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+====== Connecting wired stereo headset ======
+===== Hardware =====
+The headset receptacle is a 3.5mm audio socket with 4 poles. The poles are arranged in a way allowing for standard unmodified stereo headphones to be used.
+{{:audiojack4pin.png?|Pinout from http://www.allpinouts.org/index.php/File:Connector_minijack4pin.png}}
+The pins are:
+  * 1 (tip) left HP output
+  * 2 right HP output
+  * 3 GND
+  * 4 (sleeve) microphone
+AC100 can use a regular [[http://en.wikipedia.org/wiki/Electret_microphone|electret microphone]] connected to the 4th pin.
+NB: some noname 4-pole jack i bought for a DIY adapter was impossible to insert before filing its tip.
+===== Compatibility =====
+This arrangement is compatible with the numerous iPhone headsets and is not compatible (without hardware mods) with the scheme used by Nokia.