Jami Pekkanen wrote: > Kemal Hadimli wrote: >> 1520 ohms. >> headset button pressed it goes down to 47 ohms. > > Thanks! I bought a multimeter and got similar values. The 40-50 ohms > seems to be the headset's (microphone's and speakers') internal resistance. > > However, I now have a circuit (now just made of resistors) that has > almost identical resistances as the headset, but it still won't shut > down the internal microphone. Could there be some other magic that the > device is using to probe for the microphone?
Replying to myself here. I continued figuring out the headset detection, and I (accidentally) noticed that the resistance is different depending on which direction it's measured. On another direction it's about 1.8 kOhms and when switching around the heads of the multimeter, I get ~1.1 kOhms. So now I'm guessing that the detection is perhaps somehow done by comparing this difference. Unfortunately my knowledge in electric circuits isn't too vast and I'm having a hard time even imagining what kind of circuit could do this. Could someone with more experience in electrical systems shed some light on what could be happening here? Thanks - Jami _______________________________________________ maemo-developers mailing list maemo-developers@maemo.org https://lists.maemo.org/mailman/listinfo/maemo-developers
