Per Jessen wrote: > I have hooked up a headset to my Nanopi Neo Air, but the microphone > quality is severely impacted by electrical hum. I have tested it and > determined it is due to a power supply with no ground, i.e. the > typical 5VDC 2A with a two-prong Europlug. Using one of those small > power supplies in metal cabinets, with a ground wire, and the hum is > gone. > > The latter is not really an option, so what do people do instead?
I have discussed it on EE stackexchange, and there is no doubt it is a ground loop (Brummschleife) issue, easily solved by a power supply with ground. Does anyone know of where I might find one of those small "wall wart" style power supplies, but with a ground prong ? -- Per Jessen, Zürich (2.5°C) http://www.cloudsuisse.com/ - your owncloud, hosted in Switzerland.
