Eliminating Ground Loops

[Paul Marossy]

Well, looking at your schematic, it's leaving out details like how things are grounded. From your schematic, it looks like the inputs all have floating grounds. If everything is referenced to Vr only, then your artifical ground (Vr) is not the same as your signal ground. Do you see what I'm saying?

yes, i see what you're saying. a couple weeks ago i tried to build a headphone amp and someone on this same site save me advice to connect all of the jack ground lugs to "actual" ground(what you see as "ground" on the schematic) and to use Vr only to bias transistors and opamps. I wasn't sure if he was right or not; the circuit worked both ways. Are you saying that it would be better to connect the jack lugs to Vr instead? What difference would that even make?

I agree, connect the grounds of the jacks together and make them seperate from "Vr". That would be your signal ground. "Vr" is for biasing the opamps, transistors, etc. That's how most circuits are oridinarily designed.

[AndrewCE]

I agree, connect the grounds of the jacks together and make them seperate from "Vr". That would be your signal ground. "Vr" is for biasing the opamps, transistors, etc. That's how most circuits are oridinarily designed.

that's how i already have it. jack lugs go to "actual" ground, while virtual ground is used for biasing