[maemo-developers] N800 audio connector jack

[From: Jami Pekkanen]

Hello,

This isn't exactly maemo specific question, but I think this is the best 
forum anyway.

I'm trying to solder together an adapter that splits the N800's 4-pole 
audio plug to two separate 3.5 mm females so that I can plug in separate 
input and output devices, eg electric guitar input and amplifier output 
(with maemo doing effects in between).

So I took apart the headset that comes with the device and got the 
output part working fine, but I don't seem to get any signal to the 
input. In fact the device even doesn't switch the internal microphone 
off when I plug the modified system in.

I'm assuming that there's two grounds (golden wires, another without 
coating), left output on a red wire, right output on green and input on 
white. The guesses were right for output, but as I said, the input 
doesn't get any signal at all.

Is it possible that something special is required in the input 
connection? There at least seems to be some resistors in the headset's 
circuit, but I assumed they are just for the push-button. Also does 
anybody have a pinout for the jack?

- Jami