![]() ![]() This creates a loop, and, through electromagnetic induction coupled to all kinds of AC signals around, a stray current which then leaks through various circuits. The cable snakes its way to your entertainment center, where it plugs into your receiver, which is grounded to earth in a different place. This is an analog signal that comes into your house and is grounded to earth in one place, usually outside your house. ![]() This is particularly noticeable in analog AV setups, where the result is audio hum or visible bars in a picture, but is also sometimes the cause of unexplained equipment failures. This provides two separate paths to ground (B can go through its own connection to ground or it can go through the ground of the cable to A and then to A’s ground), and means that current may start flowing in unanticipated ways. The ground loop in a nutshell is what happens when two separate devices (A and B) are connected to ground separately, and then also connected to each other through some kind of communication cable with a ground, creating a loop. Understanding them will doubtless save you money and hassle. These magical creatures crop up out of nowhere and fry your electronics or annoy your ear holes. ![]()
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