I have a stereo (RCA) input to my car stereo. I want to input an MP3 player and a GPS into it.
Rather than just use a 2 channel mixer, I want one input to mute (adjustable) the other input when a signal is present.
By this I mean, listen to the MP3 music but when the GPS says,"turn right" I want the GPS voice to mute the MP3 music.
Does anyone out there have a circuit design for this "using discrete components" ?
I have not been into circuit design since the days of the "BC" transistors and would most likely guess some latest FETS would be good to use.
So, would anyone care to share a circuit design ???
Cheers and thanks