A transformer does this by magnetically coupling the signal across an electrically insulated barrier.įor an unbalanced interface, the transformer effectively stops any current flow in the cable caused by ground voltage differences, which stops the noise.įor a balanced interface, the transformer effectively prevents the common mode voltage from reaching the input stage of the equipment, which often has less than ideal performance. In a balanced interface (professional audio), the ground voltage difference may reveal inadequate common-mode rejection at the input stage of the equipment or other design defects.Ī ground isolator in the signal path is the fundamentally correct way to eliminate system ground loop problems. ![]() ![]() This generally produces hum or buzz in audio and hum bars in video. In an unbalanced interface (video and consumer audio), this ground voltage difference directly adds to the signal. Under such conditions systems are susceptible to oscillations or noise due to ground loops and to EMI (electromagnetic interference) from sources such as raster. Ground loop problems are caused by small voltage differences that normally exist between the ‘grounds’ at the send and receive ends of a signal cable. In this section, we're listing 3 major types of isolators that can solve the problem differently. Therefore, it's important to figure out what solution is suitable for the situation and what's not. A ground loop can be a source of interference that can induce a noise voltage between the grounds on either end of the transmission. Noise… Ground Isolation Solves the Fundamental Problem Ground loops can appear in different devices and the effect can vary.
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