I'm back + noise problem

Morshu · Post by **Morshu** » Fri Jan 31, 2014 12:07 am

why is it so difficult to get it to not emit that ground loop

I got different ground loop tones from every outlet I tried

the one with the least noisy ground loop was the transformer that has a ton of stuff connected to it, and when I plugged it into outlets with nothign in them I got a really low bass tone and the noise was louder

what exactly would I need to fix this

why is it that even though the korg r3 is plugged into the same outlet I'm plugging the moog into that the Korg r3 does not have a ground loop and the moog has one?

does this have to do with the fact that the korg r3 is a 2 prong and the moog is 3 prong?

I'm quite confused why it is doing this or what to do to fix it

what would be the cheapest sensible solution?

a hum eliminator?

Morshu · Post by **Morshu** » Fri Jan 31, 2014 12:26 am

another thing to note is it may not actually be a ground loop because the noise is very high pitched, and is available in that link I posted earlier

But I think it is a ground loop because it only occurs when I plug the moog into the outlet

X-Trade · Post by **X-Trade** » Fri Jan 31, 2014 1:43 am

high pitched sound is usually interference from your computer's motherboard or power supply.

Morshu · Post by **Morshu** » Fri Jan 31, 2014 1:56 am

why does it only pick up on the moog and not on the r3 or the microkorg

if they are all in the same outlet why should it do this

how do i fix this

xmlguy · Post by **xmlguy** » Fri Jan 31, 2014 5:35 am

The effect of the ground loop depends on the electrical design of the power supplies involved. They are producing different grounds and then produce different kinds of noise when one ground creates an unexpected circuit with current flow to another. Power supplies don't automatically expect their ground to become a separate circuit.

I already explained some of the possible solutions. The best solution is a stereo direct box with ground lift. Another is a 3 to 2 prong power adapter, with a GFCI protected outlet or extension cord on the gear that remains grounded with a 3 prong power plug. The GFCI is needed as a safety to automatically trip if current flows to the case/shield ground when it's not supposed to. A hum eliminator is not a good solution, since it deals with a symptom, not the root cause.

Morshu · Post by **Morshu** » Fri Feb 07, 2014 12:25 am

oddly enough, I almost thought the thing didn't work at first, but I tried plugging it into my audio interface and not recording straightfrom the headphone jack and the noise was 100% gone after i used a 3-2 prong adapter

Morshu · Post by **Morshu** » Mon Mar 24, 2014 2:43 pm

Well, I have a problem I overlooked

my computer motherboard continuously seems to emit a quiet white noise, its -37 db however, so its very faint, but I'm wondering if any of you know any plugin for audacity or a program for recording that would make this motherboard noise not pick up at all or lower the db of that said noise dramatically, I've chekced to see if it was my audio interface or synth and it isn't, I can record nothing and get the same noise when nothing is plugged in.

It's a slightly staticky white noise, but no other tone is in it, no hiss or anything.

Any ideas?