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| View Original: | Signal cable with ground current.svg (998x354) | |||
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| Keywords: Signal cable with ground current.svg ground loop is a very common cause of noise hum and interference in audio and video systems The diagram shows the typical circuit of the line driver and receiver in the components that interface with the cable The signal V<sub>1</sub> is applied to the conductor of signal cable S by a line driver in component 1 The cable has a ground conductor which is attached to the metal chassis of each component At the destination end in component 2 the signal and ground are connected to a differential amplifier to produce the signal V<sub>2</sub> If the chassis of the two components are at different potentials a current I will flow through the ground conductor which has a resistance R causing a voltage drop IR along the cable ground This voltage will be added to the signal voltage by the differential amplifier in component 2 resulting in interference on the signal <math>V_2 V_1 + IR \ </math> If I is an AC current and the system is an audio system a 50/60 Hz hum may be heard in the speakers 2014-02-03 04 44 06 own Chetvorno cc-zero Uploaded with UploadWizard Ground loops | ||||
