This isn't about a problem I'm having, but I'm curious why the line-out on the audio shield uses capacitors and a true ground, but the headphone jack uses no capacitors and a virtual ground? It seems like it would be safer to isolate the headphone jack in case someone plugs it into the wrong aux-in?
I found an interesting article about designing headphone circuits, but I don't fully understand it and I'm not sure how it applies: https://www.electronicproducts.com/...gn_considerations_for_driving_headphones.aspx
I found an interesting article about designing headphone circuits, but I don't fully understand it and I'm not sure how it applies: https://www.electronicproducts.com/...gn_considerations_for_driving_headphones.aspx