Hi :) on another thread ground lift was a topic. IMO we should use ground lift if needed, but also be aware that it needs care to be safe when using a ground lift.
At the moment I don't have time for research, I did a quick search on German and found this interesting thread that might be mistaken: http://www.hifi-forum.de/viewthread-29-11350.html To keep the translation short, here it's said that 50V~ and 120V= are dangerous. On the physikerboard.de I've got the nick Legastheniker and I quoted a book about VDE: http://www.physikerboard.de/ptopic,3766.html#3766 The book said that ex 60V= and ex 25V~ are dangerous. 1. For shielding GND lift is insane, it will reduce ground loop, but increase anything that has to do with shielding, as digital electric smog. Sending and receiving electric smog depends to the shielding, not only to one of both. 2. GND lift for power supplies is another issue, while ground loop will reduced or eliminated it, this could be dangerous. It would be nice if we could talk about this OT, because it would be nice, if nobody of us will be killed, just because we are mistaken regarding to ground lift methods. Again, IIRC the Brauner VM1 power supply does use a capacitor only, anyway this might not be a good solution. Any hints are welcome! Regarding to digital noise by electric smog, IMO we should think about better shielding. Again, perhaps the method to connect unbalanced instrument outputs to balanced (single sided shielded) mixer inputs might be one solution. FWIW, the DI box of my Peavy KB-300 doesn't eliminate noise. Galvanic isolation isn't a guaranty to eliminate noise, just safe regarding to other issues. Before using a ground lift I would check if everything is connected to the same power feed etc., sometimes it helps to turn the power supply plugs in the sockets, perhaps because at least in Germany neutral is connected to ground. Ralf -- Ubuntu-Studio-users mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-studio-users
