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patchbay hum
MUFF WIGGLER Forum Index -> Production Techniques  
Author patchbay hum
Granny
hello,

so i got myself a patchbay with balanced in/outs and i use stereo-patch cables. on my mixer i use unbalanced aux channels, and my effects have unbalanced in/outs, too

when i use any synth through an effect with the aux of my my mixer - no hum
when i involve the patchbay - hum

most effects, mixer and patchbay are build in a rack

any tips? is it a problem that the patchbay is balanced in/out and the rest is not?

i just ordered some humfrees that i will try
Kent
You need a grounding scheme for your entire studio system.

In my system, all of the grounds are lifted on the input side of the gear. I can explain in greater detail over the phone or Skype if you want to give me a call. It’s complex stuff but, once sorted out, pretty much guarantees a ground-loop free system. You won’t need the ‘humfrees’.

Drop me a line.
Granny
Thank you, I just googled 'ground lift' trying to make some sense out of it. Thanks a lot for your offer, I'll pm you when I have questions
BugBrand
Have a read through the Rane AppNote 110::
http://www.rane.com/note110.html
drowld
Granny wrote:
Thank you, I just googled 'ground lift' trying to make some sense out of it. Thanks a lot for your offer, I'll pm you when I have questions

You finally did something for it ?
I just redid my patchbay with new stuff and i don't even get where the ground noise come from..
Granny
drowld wrote:
Granny wrote:
Thank you, I just googled 'ground lift' trying to make some sense out of it. Thanks a lot for your offer, I'll pm you when I have questions

You finally did something for it ?
I just redid my patchbay with new stuff and i don't even get where the ground noise come from..


my noise came from a few different sources

what i did:
– bought usb isolators (i have a micro brute and a reface cs that are also connected to the computer via usb)
– cleaned lots of sockets from my old mixer
– changed some power supplies (i have a few pedals)
– changed some cheap patch cables

these power supplies were the best. i had some more expensive ones from thomann, but they made problems
https://www.justmusic.de/Gitarre-Bass/Zubehoer-Gitarren-Baesse/Netztei le-Netzteil-Zubehoer/Justin-GP-01-500-Guitar-Power-Supply

usb isolators
https://de.aliexpress.com/item/33041369434.html?spm=a2g0o.productlist. 0.0.5968164cyXVL9E&algo_pvid=1de292a2-b32e-4847-b7f8-7d683d442ba8&algo _expid=1de292a2-b32e-4847-b7f8-7d683d442ba8-0&btsid=f3c69174-7bf4-4426 -9b03-2d19c5fea346&ws_ab_test=searchweb0_0,searchweb201602_7,searchweb 201603_52
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