I'm working on a custom interface board to get my Tablet talking to my e46 BMW. It will allow be to plug directly into the stock radio harness and have provisions for iBus and the differential audio signals. The harness will also power the entire system. My question is, what kind of circuit protection should I place between the PCB and the harness? TVS diodes? Ferrite beads? Etc? How can I minimize noise on the audio signals? The Tablets audio breakout will be soldered directly to the board so I don't forsee a big problem with ground loops. Any advice is appreciated. And if it works, I'll post a full writeup. Thanks!
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