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Ground loop current induced by stray AC magnetic fields (B, green) Ground loop currents can be induced by stray AC magnetic fields [5] [7] (B, green) which are always present around AC electrical wiring. The ground loop constitutes a conductive wire loop which may have a large area of several square meters.
In the United States, the Federal Aviation Administration (FAA) issues Technical Standard Orders (TSOs) regarding equipment used on civil aircraft. The TSO for aviation headsets is C139, which includes requirements to withstand extreme heat and cold, decompression, and electromagnetic interference. [14]
Mains hum from: power supply units, nearby power supply wiring, transmission lines and substations. Audio processing equipment, such as audio power amplifiers and loudspeakers. Demodulation of a high-frequency carrier wave such as an FM radio transmission.
Headsets using this wiring are sometimes indicated by white plastic separators between the rings. [60] [59] If a CTIA headset is connected to an OMTP device, the missing ground effectively connects the speakers in series, out-of-phase. This removes the singer's voice on typical popular music recordings, which place the singers in the center.
Single-wire connectors used frequently for analog audio include: Banana connectors; Spade connectors; Five-way binding posts and banana plugs for loudspeakers; Fahnestock clips on early breadboard radio receivers. Euroblock "European-style terminal block" or "Phoenix connectors", screw terminal connectors used for audio and control signals
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