First, let me thank you for the help.
I just have a question, i use up to C2, so i won't use C2? if so, i have mono input, right?
If not so, i get 3 wires, one is ground, and the other two, what are they?
Oh, and 3v? It's great! as the gain, i don't know how much i will need, becaus this input is used to connect speaker/line out from any sound card, or other audio device to input audio to the MP3 recorder of the mobile.
As for the stereo input, this is not the standard "Hand's-free" kit microphone. This is an other audio input, because Nokia 5510 is also an MP3 player that accepts audio in MP3 format from the USB cable, but also suport's analog audio input trough the ADE-2 cable.
Here's a picture of it!
I don't know how much you are familiarized with this equipment, but in a short resume, this is a
mobile phone with built in MP3 player and FM radio tunner, so it is an 3330 with 3 more connectors:
one for stereo audio input, one stereo audio output for headsets (also used for any hand's-free kit, or to conect speakers with a converter cable thata converts from the 1,5mm stereo jack to the normal 3mm stereo jack(sorry if the measures are wrong, i have no ruller here with me... :wink
), and finaly one mini USB connector. As ofcourse, the original headset microphone is a 1,5mm jack with 4 connectors, the same from 3210 and 33x0.
So, i think that converting the mono signal to a stereo signal (i'm not worried about channel spliting, i just want to hear the same sound in both channels), would increase the sound quality and turn easier the listening.
Finaly, once again, my gratefulness.