Re: [LAU] ground loop hell

On Sun, Feb 08, 2015 at 08:08:23PM -0800, Len Ovens wrote: And that's the only right thing to do. Re. putting 10 ohm resistors in the ground connection: if you have two different ground voltages they are likely to be low impedance (if not a good cable connecting them would remove the problem). Assume you have 10 V difference and that the impedance between the two grounds is 10 ohm as well. Then we have 20 ohm total, and a current of 0.5 A. That's 2.5 Watt in your 10 ohm resistor. Which means it will first turn red and then and self-destruct in a puff of smoke. Unless it's a really big resistor. The only solution if you can't have a common ground is to use transformer isolated balanced connections, this allows you to disconnect ground at one end and still have a signal. Without the transformer isolation you could easily blow up either the output or the input, or both. Ciao, -- FA A world of exhaustive, reliable metadata would be an utopia. It's also a pipe-dream, founded on self-delusion, nerd hubris and hysterically inflated market opportunities. (Cory Doctorow)