capmaster Posted November 8, 2014 Share Posted November 8, 2014 While dealing with the ground loop problem of a forumite, I researched a bit on acoustic guitar amplifiers. The disappointing result was that most of them do not come with a ground lift switch for the entire unit. When playing a hybrid guitar through two amps, one each for magnetic and piezo signal, one of them must allow for lifting ground. Otherwise there will appear hum. There are two ways out, either a 1:1 signal transformer for one of the signals, or use of two wireless systems. A stereo wireless system would cause the same trouble on the receiver's side. Double-insulated power supplies allowing for lifting ground are standard equipment in consumer electronics and shouldn't cost that much. Why do only very few manufacturers of acoustic guitar amps use them and add ground lift switches? Link to comment Share on other sites More sharing options...
badbluesplayer Posted November 8, 2014 Share Posted November 8, 2014 Is this an issue with European power? I don't think we have those issues in the US. Link to comment Share on other sites More sharing options...
capmaster Posted November 8, 2014 Author Share Posted November 8, 2014 Is this an issue with European power? I don't think we have those issues in the US. The problem which made me research occurs in California: http://forum.gibson.com/index.php?/topic/116900-yet-another-lifeson-axcess-question/ Ground loop problems exist in any AC line power system as soon as two or more units are grounded and connected otherwise the same time, in particular with unbalanced signal lines. Link to comment Share on other sites More sharing options...
badbluesplayer Posted November 8, 2014 Share Posted November 8, 2014 Oh, ok. I got it. Link to comment Share on other sites More sharing options...
capmaster Posted November 8, 2014 Author Share Posted November 8, 2014 The problem which made me research occurs in California: Problem solved - don't play guitar in California. Unless lifting ground, I would have to deal with hum here, too. B) Link to comment Share on other sites More sharing options...
skilsaw Posted November 9, 2014 Share Posted November 9, 2014 Unless lifting ground, I would have to deal with hum here, too. B) In California they have to deal with shifting ground too. It is a problem, depending on the distance from the epicentre and its value on the Richter Scale. Link to comment Share on other sites More sharing options...
capmaster Posted November 9, 2014 Author Share Posted November 9, 2014 In California they have to deal with shifting ground too. It is a problem, depending on the distance from the epicentre and its value on the Richter Scale. Considering magnitudes and frequencies, these ground shifts are beyond all sorts of electrical troubleshooting. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.