I need to make any mobile phone believe there is a microphone headset inserted in the 3.5mm audio jack. Does anyone know where I can find a circuit diagram for a phone headset microphone?
At the moment I have experimented with resistors from mic to gnd, like this:
mic(3.5jack)------------
xxxxxxxxxxxxxxxxx|
xxxxxxxxxxxxxxxx[R]
xxxxxxxxxxxxxxxxx|
gnd(3.5jack)------------
I have had some success with the phone recognizing microphone when R has been above 2kOhm, but I want to understand why and thought I might get some better knowledge if I had a diagram of a real phone headset.
Thanks in advance
At the moment I have experimented with resistors from mic to gnd, like this:
mic(3.5jack)------------
xxxxxxxxxxxxxxxxx|
xxxxxxxxxxxxxxxx[R]
xxxxxxxxxxxxxxxxx|
gnd(3.5jack)------------
I have had some success with the phone recognizing microphone when R has been above 2kOhm, but I want to understand why and thought I might get some better knowledge if I had a diagram of a real phone headset.
Thanks in advance