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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: RE: You would still have a ground loop. posted by DC STEVE on July 4, 2007 at 08:33:07:
There are two approaches to equipment grounding: "star" and "daisy chain." In a star grounding scheme, there is one ground reference point and all the equipment is connected to it with individual wires. In a circuit diagram, this looks like a star. As long as there are no other pathways to couple the grounds together between pieces of equipment, this is the best method. However, most audio equipment has some internal connection of audio zero reference to AC safety-earth. The interconnect cables complete the ground loops as I described above, regardless of whether the equipment is star-grounded to the power distribution point.
"Daisy chain" grounding is the lazy way, and almost guarantees trouble.
Your BP device may have the chassis ground point to allow a star-ground setup for equipment connected to it. However, this would have to be done in conjunction with some method of interrupting the audio zero reference connections somewhere. Some equipment includes "ground lift" switches. These switches break the connection of audio zero reference to AC safety-earth inside the equipment. Another approach is to use signal transformers to break the audio zero reference connection between pieces of equipment.
Don't add ground wires to equipment that already has three-wire AC plugs. These additional ground wires create additional ground loops.
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Follow Ups
- Not sure what the purpose of the ground point is. - Al Sekela 12:10:50 07/04/07 (0)
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