Pinouts of connectors of various devices - from cellphones to car connectors.  > Mighty dwarf pinouts
If you do not require DC power previous pinout works fine. If you do require DC power and audio then you need seperate grounds. I also noticed that the audio cable needs to be screened.

 

Device 1
Pin Number
Device 1
Pin Name
Direction Device 2
Pin Number
Device 2
Pin Name
Description
1

Vcc 5V DC

  N/C   5V DC from USB Connector
2 Right Audio In   2 Right Audio Right Audio Out
3 Left Audio In   1 Left Audio Left Audio Out
4 Audio Ground   3 Audio Ground Audio Ground
5 DC Ground   N/C   Ground from USB Connector

 

5 pin Mini-USB type B plug connector layout
5 pin Mini-USB type B plug connector
at the Speaker
3 pin stereo plug connector layout
3 pin stereo plug connector
at the Audio Source
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Mighty Dwarf, Audio and USB Connector visual pinout:
Mighty Dwarf, Audio and USB Connector diagram
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