patchbay hum

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Granny
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patchbay hum

Post by Granny » Tue Mar 27, 2018 8:07 am

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

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Kent
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Post by Kent » Tue Mar 27, 2018 8:23 am

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.

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Granny
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Post by Granny » Tue Mar 27, 2018 2:12 pm

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

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BugBrand
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Post by BugBrand » Wed Mar 28, 2018 1:33 pm

Have a read through the Rane AppNote 110::
http://www.rane.com/note110.html

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drowld
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Post by drowld » Tue Oct 22, 2019 3:22 pm

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..

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Granny
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Post by Granny » Fri Nov 01, 2019 11:10 am

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/Z ... wer-Supply

usb isolators
https://de.aliexpress.com/item/33041369 ... b201603_52

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