2012年10月21日 星期日

拆解 VIA 8850 平板電腦的無線網路模塊

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這台 VIA 8850 平板電腦的無線網路模塊使用 realtek 的 RTL8188CTV晶片。

網路資料顯示 RTL8188CTV可以工作於3.3V及5V,所以我就為這個模塊接了一個標準的USB頭:














這樣的組合可不可以給PC/NB使用?

答案是:可以的。只要安裝驅動程式就可以了。(但是其間有遇到一台NB根本無法偵測到有插入USB的情形,原因不明)

相反的情況,一般給PC/NB使用的USB無線網卡可不可以給這台平板使用?(下圖裝置使用Ralink晶片 )


















答案可能是要看您運氣好不好,運氣好就剛好可以。

如果 \FirmwareInstall\firmware\modules.tgz\system\modules\3.0.8-default\ 裡面剛好有驅動程式就可以用:

















但似乎沒有隨插即用的功能,而是要先插好然後再冷開機才偵測得到。


關於 RTL8188 晶片

RTL8188 有多種版本,底下是網路上找到的資料:

RTL8188CTV:正常功耗版本
RTL8188CUS:低功耗功耗
RTL8188EUS:比RTL8188CUS更省電


Network Signal Info apk 實測:
晶片:RTL8188CTV
AP:T07AW(輸出功率設為 30mW)
室內距離 AP 約 1.2米處:-45~-52dbm
室內距離 AP 約 8米處:-66dbm


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8 則留言:

  1. hi, i would like to know if you can help me with this mini card to use as a wifi usb adapter. Please, show me how it works. thank you and please email me at begjan@yahoo.com

    reply me soon as a possible

    have a nice day

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    1. I try this USB+mini 8188 card about 1-1/2 years ago.

      I can't try it again,because I don't have this USB+mini 8188 card now.

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  2. but, how to welding, i have usb header with 0.7 meter and i wanna is it as usb wifi? please help me.
    do you have a installation drive? can you send me the link...
    thank you & best regards

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  3. picture1:
    red: vcc+
    white:d-
    green:d+
    black:gnd

    google:RTL8188CTV driver

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  4. hi. it's worked, thank you very much. but there is another problem with heat. about 1 minute use and it's head a lot almost burns my finger. how to solve it. many thanks to your reply...

    best regards

    begjan

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    1. on tablet,it uses 3.3V;on PC/NB,it uses 5V.
      This is a source of heat.

      I'm not sure how long it can tolerate such heat.

      Maybe you can try PC/NB --> USB --> 1A diode (2or3 in serial) --> rt8188.





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  5. hi again. sorry i am not very good with electronic circuits stuff... can you show me the 1A diode or other 2,3 diode's in picture and how to welding it with my rlt8188ctv...

    it's very hot when i plug to my laptop ^^. thank you again...

    best regards

    begjan

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    1. reference this picture:(no need 10K ohm)
      http://jeelabs.org/wp-content/uploads/2013/04/JCs-Grid-page-712.png

      you can use 3 x 1N4001 in serial. one 1N4001 drop 0.6V.

      red line (5v) -- IN4001 -- 1N4001 -- IN4001 -- about 3.3V

      google : 1N4001


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