I am a newbie, but I've been stuck on this problem for a year, I keep coming back to it, and I've probably wasted over 20 hours on it.
I need to feed the audio out signal from my PC headphone out, into the microphone input of my Android phone (a Galaxy S1). The purpose is because I have a fancy voicemail greeting I made in an audio editor on my PC, and want to record it as my voicemail greeting, and simply holding the mouthpiece of the phone up the the pc speakers is unacceptable quality wise.
Now I've identified the proper pinouts for the mic in, and headphone out, however connecting them doesn't work. From what I've been able to find, you can't just do this, because the headphone signal is too strong, or different.
I've put a multimeter on the android microphone pins, and it shows about 4 mV voltage going through that circuit. I'm guessing this means you can't necessarily simply feed it an audio signal, I'm guessing its expecting a microphone to cause very small ripples on that 4mV signal it provides.
Thus I'm sort of guessing I may need some sort of transformer, to hook the primary coil up to the PC headphone output, and run the secondary coil in place of the microphone on the android, inducing the audio signal into it. Just a guess though. This is pretty much where I'm stuck, don't know where to go from here.
Any advice? I can't believe I'm so stuck on such a seemingly simple problem of plugging 2 audio devices together. Thanks.
I need to feed the audio out signal from my PC headphone out, into the microphone input of my Android phone (a Galaxy S1). The purpose is because I have a fancy voicemail greeting I made in an audio editor on my PC, and want to record it as my voicemail greeting, and simply holding the mouthpiece of the phone up the the pc speakers is unacceptable quality wise.
Now I've identified the proper pinouts for the mic in, and headphone out, however connecting them doesn't work. From what I've been able to find, you can't just do this, because the headphone signal is too strong, or different.
I've put a multimeter on the android microphone pins, and it shows about 4 mV voltage going through that circuit. I'm guessing this means you can't necessarily simply feed it an audio signal, I'm guessing its expecting a microphone to cause very small ripples on that 4mV signal it provides.
Thus I'm sort of guessing I may need some sort of transformer, to hook the primary coil up to the PC headphone output, and run the secondary coil in place of the microphone on the android, inducing the audio signal into it. Just a guess though. This is pretty much where I'm stuck, don't know where to go from here.
Any advice? I can't believe I'm so stuck on such a seemingly simple problem of plugging 2 audio devices together. Thanks.