I am having a problem with a high noise/ tone coming my system
Weirdly it kinda disappears when a signal is loud but it comes fully back in at the time that impact/ signal goes off.
I already unplugged everything
Only plugged in a few modules
Still the same problem
It’s very annoying :/
I only kept in plaits beads and the in out frm intellijel as the Vermona out
I also plugged out the vermona out.
I have the feeling that it’s much louder on the vermona out
But it’s hard to tell as it can be much louder
Will make a Leveling Check tomorrow after work
If some one has an idea or any help would be much appreciated
Maybe my new beads is the problem
Will test it out if it’s still there in other cases
Bus boards. And if the noise is still there

j.manuel

If your build uses an inline DC "brick" for power, try getting a second one and swapping that. The switching supplies that tend to get used in Eurorack can spit out a lot of high frequency hash, although most of the time it's way on up in the ultrasonic range. However, switching supplies can make audible high frequency noise if/when certain components in them are in the process of failing. Also, recheck your amperage draw now that you've added new modules; you might be too close to the P/S's maximum current load by accident, and this would definitely stress the "brick" as a result.

And yes, you CAN use a brick supply that has a higher output than the one you currently have. If you're closing in on that current maximum on any of the DC rails, I'd suggest that as a worthwhile purchase.


Hey Lugia thank You v much for ur thoughts
and hello to everybody else who stumbles upon my misery,

I am currently at
1452 mA +12V | 830 mA -12V | 0 mA 5V

Thats the Case I have:
Intellijel Designs - 7U Stealth Case (104TE/TPS80W MAX)

https://schneidersladen.de/de/intellijel-designs-7u-stealth-case-104te-tps80w-max-inkl.-kaltgeraetekabel

Power Brick :
https://schneidersladen.de/en/intellijel-designs-mean-well-90-w-power-brick-incl.-power-cable

I think the problem might be the beads that would be bad I will trouble shoot the whole system again today.
The noise-high frequency Sound only appears when I patch something into beads input.
like Plaits, but I give plaits no trigger for example.
When I trigger Plaits, the tone disappears nearly but its still audible, but it does come back fully after a short time.

I tested it like this.
Still there
https://www.dropbox.com/s/sdovpdyr1lyb6bn/IMG_2098.jpeg?dl=0

Thought my case must be the Problem...

But I have to Point out I have already tested it in this Modular Case
(Intellijel Designs - Palette 62)
https://schneidersladen.de/de/intellijel-designs-palette-62

Still there...

I tried with this Power supply in my old skiff :

https://schneidersladen.de/de/4ms-row-power-45

But to make it audible I had to go thru my Vermona and Intellijel InOut

I then didn't hear the high tone, but wow that was noisy.

I live in an old shit DDR building my the electricity be the problem? I don't think so :/

I will try everything again.
I have the Digital Modules-Fx the Databender for example
There is no Problem with this...

If its still there I will try out my Mutable beads at a friends place in his case.
As the Sound was still there when I unplugged everything else and only kept in a few modules at a time,
I think the power consumption might not be the problem.

If anyone has an idea what I can also try
would be appreciated :)

j.manuel

It sounds like you are doing all the right things to track down the noise.

One thing to be aware of is that if a module is dumping noise into the system that same noise can present at the output of other modules!

This can lead to a cascade of noise build up, the one problem becoming more amplified as more patch points are connected to the outputs.

The first time I encountered this it drove me crazy until I figured out what was going on, it just so happened that I had one module with a screen that was generating noise (as they do) right next to another module that was very prone to picking up noise! Who knew!!??

Also, I am sure you know this anyway, but for those who may not, check your gain staging.

Finally, some proper analysis tools can help enormously when tracking this kind of thing down.

I am taking commissions for synth builds. UK ONLY for now. DM for details :)

You can find my modular synth album here https://kel-audio.bandcamp.com - enjoy!

I'd try to find out if anyone else with beads, the 7u intellijel case and specific psu (I think there were 2 options, but not sure) has the same problems

those intellijel psus are quite decent but are noisier than some especially at very high frequencies - which some modules may pick up - they are not for example suitable for video work


This might be solvable with some ferrites. First up, these: https://www.dxengineering.com/parts/dxe-csb31-525-5 These should go on the DC out from the Meanwell brick...open one up, loop the DC out line around it a couple of times right next to the brick, then snap it closed. That'll kill any RF on the DC line before it gets into the cab.

Next, you'll want two of these: https://www.mouser.com/ProductDetail/LeaderTech/SA28B0071/?qs=70SGE8EoboRwQl%252BZe6ev%252BQ%3D%3D One goes on the ribbon cable near the busboard, and the other on the cable close to the module itself. This way, anything that CAN get onto the power line either won't make it off of the busboard, or if it's RFI inside the cab getting onto the ribbon itself, the ferrite by the module will stop that.


Hey everybody who's following this
Thank u @Kel_, JomHowell and Lugia

The problem is the noise or peep is clearly in the signal chain.
if I use it as a comb filter or pitched delay the same happens with the peep, also its also there when turned fully dry, or in case of the Vermona out, also when its turned down . Same with the intellijel 64 case from my girlfriend.

so the father of my girlfriend (he's far away in russia) who is an electro engineer said one problem could be our electricity at home. He suggested Tension compensation or Power Conditioner or Isolation-Transformator, ( I don't know the right term, he's Russian, I am German so there is a double translation). smth like https://www.amazon.com/Tripp-Lite-Isolation-Transformer-Outlet/dp/B00006HPFH/
(f**k amazon)
or this
https://www.thomann.de/de/adamhallpcl10propowerconditioner.htm

it could lower the noise a bit...

The other pilot is the grounding. He said my case or few of the modules could have lost the grounding, as I just moved in, maybe there is a truth behind this. Or from the livestream performance at an other place idk..

also: i have stumbled across some similar product as Lugia described.
https://www.perfectcircuit.com/trogotronic-m-05-silencer.html.
Its sold out so I will try what Lugia posted. Do You have any experience with it?

The search continues. I am kind of a neurotic person now I am way more aware of the noise (and high Pitch tone) my
Morphagene has and the noise level the data bender has. xD its driving me nuts

A friend of me has a mutable beads by himself and a intellijel 104/ 7u (Bought 2018 as mine). He has found the same freq but way quitter is 4032 Hz. SO IT IS A GENRAL PROBLEM WITH THE BEADS AND THE CASE. But he said he could live with it mine is much louder, as he has heard in recordings I've sent him.

I´ve taken my beads and case to the studio I work at rn there is another beads too, but in a huge doepfer case.
Same frequency but way way quieter. I switched them, put mine in the rack. same freq but way quiter. So something I could live with.
had no time to listen to the other one in my case. But mine in my case had the same problem in this studio, so its no problem I only have at home.

Here a recording of a plaits going into the beads:
https://www.dropbox.com/s/sdovpdyr1lyb6bn/IMG_2098.jpeg?dl=0

here only beads input is just from Xpan so the cable is not floating around and hums (same with an empty input from Optomix, maths or a Plaits with cable to the trigger in but not triggering)- U can hear how the beads pics up the Ground noise and it goes in the signal chain.
https://www.dropbox.com/s/zoufj702puip2xv/beads%20quite%20xpan%20as%20input-%20acting%20as%20delay%20.mp3?dl=0

Humm and noise from the Data Bender
https://www.dropbox.com/s/f41u8x1fetzg477/Humand%20Noise%20from%20the%20Data%20Bender.mp3?dl=0

next thing I will do is to test a doepfer a 100 case, with the modules at home.


Linear Power Adapters are a thing to:
But the could modulate oscillators and they are huge.
Maybe that's an option too

I think I will have to write Emelie from Mutable and to Intellijel. :/

best,
Johannes

j.manuel

It sounds like you are doing all the right things to track down the noise.

One thing to be aware of is that if a module is dumping noise into the system that same noise can present at the output of other modules!

This can lead to a cascade of noise build up, the one problem becoming more amplified as more patch points are connected to the outputs.

The first time I encountered this it drove me crazy until I figured out what was going on, it just so happened that I had one module with a screen that was generating noise (as they do) right next to another module that was very prone to picking up noise! Who knew!!??

........I took out everything else changes rooms in the flats etc. Thats sadly no the problem
had this with the black mixer of Erica synths, it was picking up noises of the modular

:) Thank u

j.manuel

This might be solvable with some ferrites. First up, these: https://www.dxengineering.com/parts/dxe-csb31-525-5 These should go on the DC out from the Meanwell brick...open one up, loop the DC out line around it a couple of times right next to the brick, then snap it closed. That'll kill any RF on the DC line before it gets into the cab.

the power brick from intellijel already has that thing included might not be it.
but maybe I should get a new power brick
on the other hand there is still the noise in my girlfriend Intellijel 3 u /64 system :((

j.manuel

At least it's just a problem in the Eurorack cab itself. This reminds me of a much more confusing "noise" issue I ran into in the studio back in the mid-80s...

I was setting up some mics on a piano. I'd put up a stereo pair of AKG 414s overhead for the overall sound, a couple of AKG 451s aimed inside the piano, and I put a Shure SM81 underneath to capture more of the cabinet resonance. Walked back into the control room, ran up the channels to check for room tone issues...and waaaaaay down low, I could hear a...piano?

OK, there wasn't anyone playing it at this point. Piano's still there, though...so I pushed the input pre and fader to the max to see what in the hell this could be. And I heard the same four chords being repeated...and a voice saying "Radio Canada International" in English and French. And I knew EXACTLY what that was. It was only on that Shure, though...

I went back out, swapped the SM81 for a different pencil condenser, went back into the control room...no piano noise.

So what WAS that, anyway? Well...somehow, the SM81 was picking up a shortwave broadcast transmitted from Sackville, New Brunswick, Canada on Radio Canada. Now, if I lived right down the road from this, it might make sense. But this was out in the Nashville burbs, over 1000 miles distant. Suffice to say, I tagged the mic for the studio tech to deal with, and since then I've got a rule that I DO NOT use Shure condenser mics, period.

Moral of the story: noise chasing isn't the easiest thing, and often the solution is far from intuitive. Had I NOT had a long background of working with amateur radio, shortwave listening, and such, I probably wouldn't have figured out what was happening, as you'd never expect an RFI issue like that.


Moral of the story: noise chasing isn't the easiest thing, and often the solution is far from intuitive. Had I NOT had a long background of working with amateur radio, shortwave listening, and such, I probably wouldn't have figured out what was happening, as you'd never expect an RFI issue like that.
-- Lugia

Ha nice story! I also read at muffwiggler about someone who had signals in his modular caused by the plasma lamp next door :D

anyway, my problem seems to be system related or better to say system related in connection with the beads.
others have exactly the same problem. someone else started a thread in the mi community
https://forum.mutable-instruments.net/t/beads-constant-high-pitched-noise-on-outputs/18263/17

But the nature of hardware is that it has a noise floor undeniable. would be interesting to have something that takes that out a bit before hand.
Need to wrap my head around this. Because its something that sometimes gets on my nerves, fo example when I am processing the signal afterwards

j.manuel