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FIIO E3 - reverse engineered. Remove bass boost. Change gain.

  1. MagnusThome
    http://magnus.thome.nu/fiioe3/01.gif
     
    http://magnus.thome.nu/fiioe3/02.jpg
     
    http://magnus.thome.nu/fiioe3/03.gif
     
     
    To remove bass boost:
     
    I've just removed C4 and C6 (you can instead short both of them if you want, will result in lower gain). Don't forget to do it on BOTH channels :wink:
     
     
    To reduce gain:
     
    Change R6 to a larger value, I put a 22k resistor there. Again, do it on both channels :wink:
     
     
     
     
     
    Cheers!
     
     
    /Magnus
     
  2. MagnusThome
    I've:
     
    - removed C4
    - replaced R6 with a 22k instead of the 2k2 resistor
    - shorted C6
     
    ...on both channels of course [​IMG]
     
     
    http://magnus.thome.nu/fiioe3/A-C4-removed.jpg
     
    http://magnus.thome.nu/fiioe3/B-R6-removed.jpg
     
    http://magnus.thome.nu/fiioe3/C-new-R6-in-place.jpg
     
    http://magnus.thome.nu/fiioe3/D-C6-shorted.jpg
     
     
     
    And in addition to that I've squeezed in a 3,3 volt regulator with two capacitors to be able to get power from a USB connector. A bit ugly but... small! :D
     
    http://magnus.thome.nu/fiioe3/PowerfromUSB.jpg
     

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