Manufacturing of Siemens SX1 stereo earphone Adapter

One of the most prominent advantages of the Siemens SX1 mobile phone is that it supports stereo MP3 and built-in FM. Although the original stereo PTT headset is of good quality, it can also be used as an antenna with built-in FM, however, one of the traditional methods of using a Siemens mobile phone is to use a headset adapter to enable the use of standard 5mm stereo headphones, such as senhaiser mx300/400/500. Therefore, the modification of the SX1 stereo earphone adapter also appeared.

In fact, the conversion principle is the same as that of the x6x8 series mobile phones, but the charging/attachment interface used by SX1 is not the original thick interface, instead, the thin interface (Slim lumberg) used since the x55 series has been used, and the definition of pins has also changed.

I first used an x55 PTT headset connector to connect to the 3.5 stereo socket for modification. The Pin definition is as follows:

Pin2-5 transient connection,

Pin3-4-6 transient connection,

Pin8-stereo headset left audio (L ),

Pin9-headset location (Gnd ),

Pin10-Right audio (R) of stereo headphones ).

MP3 audio and video effects

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However, when switching to the radio function, the phone will prompt that no antenna is found and the FM cannot be listened.

I guess it is the PTT headset that the mobile phone identifies as an attachment, and does not enable the antenna function (in fact, the headset line is the antenna). I need to change the pin's short connection mode so that the mobile phone can correctly identify the antenna, after some exploration, determine the pin wiring method as follows:

Pin2-6 transient connection,

Pin3-4-7 transient connection,

Pin8-stereo headset left audio (L ),

Pin9-headset location (Gnd), the experiment found that pin11 can also be used as the headset location (Gnd), the effect is the same, a bit strange, because pin11 is used as the mic location in PTT headphones.

Pin10-Right audio (R) of stereo headphones ).

After the cables are connected in the above method, use the hot sol to stick the slim lumberg connector and the 3.5 stereo socket to a fixed position, and the mobile phone adapter will be ready to connect to the standard 3.5 stereo earphone, in addition, you can normally listen to the Stereo FM, and there is no unrecognized antenna. The effect is as follows:

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Listen to stereo MP3

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Listen to FM

The above modification is very easy to implement. Slim lumberg can buy an assembled x55 headset (about 5 yuan), 5mm stereo socket is generally 2 yuan, and then it will use electric soldering iron.