Hello everyone, first post here. In my vehicle, I have a radar detector that has a mono line out. I also use my phone for music in the car and was able to combine the 2 sources with a non powered mixer/splitter. This works fine, but when I am charging the phone at the same time, I lose audio from the radar detector. I don't get chimes but rather bassy thumps.through the speakers. I was told that I would need an audio output transformer so I picked one up at radio shack. Part number 273-1380. I really have no idea how to hook this thing up. I'm a novice at soldering but am handy enough. Anyone have any input for me? It would be really nice to have both sources combined while charging the phone. Thanks guys