[solved] High noise level at all times

[semmo]

@plutek

what type of cable are you using here, and is the input you’re plugging into balanced or not? or, to look at the question another way: do these observations change if you switch your output cable between a balanced type and an unbalanced type? yes, i know the output circuitry may not be properly feeding the +|-|GND of a balanced connection when it is not powered, but there still may be differences in how various circuit paths are coupled, depending on which cable type is used. …again, this would need more detail from hardware designers at MOD, to help sort out what any such observations might mean in a Dwarf with a power switch set to OFF.

The observations does not change when I switch the cable from balanced to unbalanced, nor if I put a DI box in between. Also, my device is a Duo X, not a Dwarf.

[plutek]

@semmo

device is a Duo X, not a Dwarf.

yep… brain fart, just corrected!
…i got enchanted with the imagery of a Dwarf without (Magical) Power. lol

[spunktsch]

@semmo sorry if I missed that part but did you tried it without the usb interface?
Only other option I use that you could try is 12v USV like that Tecnoware mini

[ADK]

For me happens that thru headphones sounds awesome,but when i connect an output is sounds very very different , so headphone was not an option for me to make sounds

[CelloBas23]

Yep, on the label of your PSU there is an icon “square within a square” : meaning double-isolated. I tested my original PSU shipped with Dwarf with a multimeter: the ground AC pin has continuity with both DC pins; potentially causing ground loops, especially when patching other effects with it. My other adapter Moeer (for Micro Power brick) 12V@2A:DC - is double-isolated.
I ordered a Zoom AD-19 adapter: 12V@2A:DC + and it is double-isolated.

[ADD] Another option is RockPower (by Warwick) 12V@1500mA : DC + . No indication if double isolated, but continuity check with multimeter is luckily negative. I believe power adapter SMPS technology will always utilize a double insulated transformer.

[adrianbeat]

This was a long reading (I couldn’t finish it). But thank you all for the clues, you help me fix my Mod Duo X noisy setup. My solution:

2x Passive DI (Behringer HD400), one before the input and one after the output
1x cheap 12v power transformer, I actually found and old one that I didn’t even remember that I had

System up and running and no noise at all even with the USB connected
Having 3 factors of noise combined was a little tricky

[UnvisualStudio]

Hi! Maybe this could be useful for you:

Ruido de guitarra / guitar noise / ground loop noise

Bye!