Hi there. I'm looking to inject an audio signal from a hobby project into the intercom system of a light aircraft using one of the spare mic sockets. The project produces audible warnings, and has an output which can be used to drive earbud type headphones. I had thought (incorrectly!) that I could simply drop this level down to mic level (ie. a few mV or so) and connect via one of the microphone sockets, but all I get is white noise. I don't know much about audio, but I'm guessing there's some DC voltage passed with the mic signal to bias the microphone element...
Any suggestions on what I need to do to the signal to present it in a way the mic socket will accept would be appreciated. The mic sockets are supposed to work with almost any amplified dynamic or electret microphone.
Regards,
B
Any suggestions on what I need to do to the signal to present it in a way the mic socket will accept would be appreciated. The mic sockets are supposed to work with almost any amplified dynamic or electret microphone.
Regards,
B