If your thing is battery powered, there’s no danger here go nuts because there is no way to create a ground loop.
When it comes to your oscilloscope, it’s likely that you will at some point want to probe something that is powered by mains, and then you get a completely different kind of ground loop. Do not use a cheater plug or remove the ground pin, as that just eliminates a safety feature and could create a dangerous situation with a chassis at live voltage. Another option is to use an isolator, which you could purchase for your cable of choice or design into your project with an optoisolator or isolation transformer. Some wired protocols use differential signals instead of single-ended signaling so that there isn’t a need for a common ground for reference. Move plugs around so that they are plugged into the same outlet, making your loop as small as possible.
#Audio ground loop isolator schematic Bluetooth#
You could switch to a wireless communication, like Bluetooth or WiFi. The most certain way is to cut the loop, which means removing the cable, or replacing it with something that isn’t a wire.
Now that you’re an expert, solving the problem (or avoiding it entirely), is pretty straightforward. It’s not uncommon for there to be a 50 or 60 hertz hum in audio equipment thanks to the effects of ground loops. Another way to think of it is as one half of a transformer it’s a single loop and a good portion of that loop is right next to the live wire of the building power with a constantly changing current. 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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