Noise/hum when plugging into MIDI IN on SH1oh1

Support and discussion of Tubbutec products.

Moderators: Kent, tubbutec

Post Reply
jpmct
Learning to Wiggle
Posts: 8
Joined: Sun Dec 16, 2018 5:00 pm
Location: w.midlands

Noise/hum when plugging into MIDI IN on SH1oh1

Post by jpmct » Thu Jan 23, 2020 8:34 am

I have a problem with noise/hum when plugging a midi cable into the midi in of the sh1oh1. My set up is simple -- I am just using the sh1oh1 as slave when clock syncing to external sequencer. The noise is present whenever the midi cable is plugged into the sh101 and stops when it is removed. I've tried replacing the s101 with another synth to see if the problem is from my other device but all other synths I've tried give a crystal clear signal when connected.

User avatar
tubbutec
Veteran Wiggler
Posts: 559
Joined: Sat Dec 27, 2014 4:29 am
Location: Berlin
Contact:

Re: Noise/hum when plugging into MIDI IN on SH1oh1

Post by tubbutec » Thu Jan 30, 2020 2:19 am

This is off for the simple reason that midi is not ground coupled. So there should be no additional noise via a ground loop.
Is the noise just there if you plug it in, or only if you also send midi? Does it go a away if you stop sending midi clock and notes?

jpmct
Learning to Wiggle
Posts: 8
Joined: Sun Dec 16, 2018 5:00 pm
Location: w.midlands

Re: Noise/hum when plugging into MIDI IN on SH1oh1

Post by jpmct » Fri Feb 14, 2020 12:47 pm

Hi, thanks for replying -- I can confirm that the noise is only heard when it's receiving midi clock and note messages. When I stop sending midi clock and notes from the master device the noise stops.

jpmct
Learning to Wiggle
Posts: 8
Joined: Sun Dec 16, 2018 5:00 pm
Location: w.midlands

Re: Noise/hum when plugging into MIDI IN on SH1oh1

Post by jpmct » Fri Feb 14, 2020 1:29 pm

The noise is easily heard on recordings -- any help/info on how to fix this would be really appreciated

User avatar
goldplate
Common Wiggler
Posts: 150
Joined: Sat Oct 10, 2015 9:12 am

Re: Noise/hum when plugging into MIDI IN on SH1oh1

Post by goldplate » Fri Feb 14, 2020 1:30 pm

Maybe the internal MIDI cable is near a critical audio path ?

jpmct
Learning to Wiggle
Posts: 8
Joined: Sun Dec 16, 2018 5:00 pm
Location: w.midlands

Re: Noise/hum when plugging into MIDI IN on SH1oh1

Post by jpmct » Fri Feb 14, 2020 2:36 pm

OK, I'm not technical enough myself to start opening it up and moving parts. Are there any other explanations that might be causing so I can pass this on to an electrician. Anything at all will be a help

Thanks

jpmct
Learning to Wiggle
Posts: 8
Joined: Sun Dec 16, 2018 5:00 pm
Location: w.midlands

Re: Noise/hum when plugging into MIDI IN on SH1oh1

Post by jpmct » Fri Feb 14, 2020 2:38 pm

"Maybe the internal MIDI cable is near a critical audio path ?" -- would it be possible fix this with little electronics experience?

Post Reply

Return to “Tubbutec”