![]() ![]() ![]() As soon as I connect it to my studio mixer and amp it picks up some line frequency buzz. My eurorack has a single plug going in and splits to two power supplies. And there may be more than one subpanel.From what I understand it's supposed to be possible to eliminate ground loops by making sure all your gear is grounded to the same potential, but I've never really been able to make that work in practice. These connections inside the subpanels must be removed. Unfortunately, your typical breaker box ("sub panel") from Home Depot has this connection installed as a default and many (most?) electricians do not know to remove the bond when installing it as a subpanel! If these subpanels are installed distant from the main panel with N-G bonds inside them, you have a noise field generator. According to the National Electrical Code, there should be one and only one connection ("bond") between the neutral and ground and that should be inside the main breaker panel at the service entrance (where the wire from the street comes into the building). The most common of these is an extra ground-to-neutral bond. All of these are dangerous safety violations that must be fixed immediately. The most likely culprits are improperly routed 3-way switch, improperly routed Edison shared neutral circuits, ground-to-neutral bond out on the branch that allows the return current to travel the wrong route, or a batch of neutrals from several circuits bundled together. The hot and neutral must stay together in the same conduit, ideally twisted together, if they travel separated routes, they become a magnetic field generator. Current is traveling around a physically large loop. Have the electrician very carefully check the AC power circuit of the lights. It is possible that the AC wiring was done wrong and must be fixed by a professional. Sometimes an installation is still too noisy even when everything is done right as above. ![]()
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