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Isolator – 4 HP transformer galvanic isolation
MUFF WIGGLER Forum Index -> Eurorack Modules  
Author Isolator – 4 HP transformer galvanic isolation
igorrr
Isolator is your 4 HP solution for galvanic isolation between its inputs and ¼ TRS balanced outputs, interfacing your Eurorack modular system without electric connection with the external equipment, which prevents possible ground loop issues. Each channel has a ground lift switch, so some ground loop problems can be solved with this full/partial ground lift option.
If no signal is plugged to the right input, then left input will be sent to both Left and Right outputs. “Level” knob adjusts output level for Left and Right channels.
Price -100 USD or 88 Euro.
https://www.signalsounds.com/happy-nerding-isolator-eurorack-audio-i-o -module
https://www.schneidersladen.de/en/happy-nerding-isolator.html
http://www.midiamsterdam.nl/happy-nerding-isolator.html
https://soundria.com/happy-nerding-isolator.html
https://www.modulargrid.net/e/happy-nerding-isolator
matttech
Another nice looking design! thumbs up
Tonescape
Looking great. Can you tell anything about the transformers? Do they also add a bit of that magic colour that we all seek? cool
igorrr
I use NOS soviet transformers. As usually with audio transformers - they introduce harmonics for low frequencies. So 60 Hz sine wave of 10 V p-p has around 1 % of THD, less distortions for lower volume or higher frequencies.
Some people just like transformer sound, but I personally can not get any sound difference. I quickly switched original audio and the audio passed through this module and found no difference. I may upload some audio recorded through “Isolator”, so anybody interested can check.
MATSmile
Does it retain the level of the signal ?
igorrr
MATSmile wrote:
Does it retain the level of the signal ?

Yes, the level is almost the same at fully CW position.
Thanks to everyone who express the interest in this module. I’m now ordering parts to assemble more modules, will inform as soon as the modules will be available again.
Vlad Green
Great news! igorrr do you plan to make also an input module with transformers?
igorrr
Looks like the input module is interesting for many, so will consider it for sure.
Multi Grooves
igorrr wrote:
I use NOS soviet transformers. As usually with audio transformers - they introduce harmonics for low frequencies. So 60 Hz sine wave of 10 V p-p has around 1 % of THD, less distortions for lower volume or higher frequencies.
Some people just like transformer sound, but I personally can not get any sound difference. I quickly switched original audio and the audio passed through this module and found no difference. I may upload some audio recorded through “Isolator”, so anybody interested can check.



It's worth trying to run that 60Hz signal via laptop or mobile phone speakers, then running the same signal via the trannies, and it should reveal itself...
Tonescape
I really like this module and the idea. However, having recently purchased the "Out" module from you, which is just perfect with the lovely meter and dual ins, I will probably not buy the isolator, even though it would be nice to have a galvanic isolated out.

I wish there was a way of coupling the two modules internally, as going from 1/4 jacks to 1/8 jacks is kind of a pain Dead Banana

Might end up getting one anyway though, ha ha. Massive Happy Nerding fanboy over here!
xenosapien
Perfect! Give us an order link already wink
igorrr
Tonescape wrote:

I wish there was a way of coupling the two modules internally, as going from 1/4 jacks to 1/8 jacks is kind of a pain Dead Banana

It is already done. Isolator has receiving connection and OUT has sending socket – can be seen if the module is removed from the case and looked from the side.
Tonescape
we're not worthy

Of course you thought about that.

Will both outputs work in parallel then? As in, can I pull signal from both the "out" and the "Isolator" at the same time?
igorrr
Yes, both outputs work independently. Level which you set with the smaller knob of your OUT module will be copied to the Isolator’s input and then can be additionally decreased with the Isolator’s “Level” knob appearing at the transformer isolated outputs. Isolator’s panel 1/8 inputs will still work allow adding another stereo signal.
Tonescape
Great w00t

Sold! Mr. Green
visible cow
Any idea when these will be available in the states? Looking to pick up a pair.
igorrr
Sorry, can not indicate the date yet.
Paranormal Patroler
This is interesting! Now make one with Cinemag hihi
Funky40
Tonescape wrote:
Do they also add a bit of that magic colour that we all seek? cool

igorrr wrote:
I use NOS soviet transformers. As usually with audio transformers - they introduce harmonics for low frequencies. So 60 Hz sine wave of 10 V p-p has around 1 % of THD, less distortions for lower volume or higher frequencies.
Some people just like transformer sound, but I personally can not get any sound difference. I quickly switched original audio and the audio passed through this module and found no difference.


take this as a hint in some direction and not as a real review or the truth, i´ve not patched much.
( I mainly made some tests when i got my isolator. but those quite thoroughly cause i wanted to clear something for me upfront.
so these have not been full Synth-patch voices exept some very simple ones up front )

to me it (absolutely) colours the sound, but it much depends on the source.
in most cases could i hear a difference.
In most cases would i have prefered the Isolator sound. More Bass, the sound seemed fater. ( this was directly my very first impression)
Sounds with sharp hi-freq content *in the main focus* or even digital artefacts and aliasing in the focus or as a main part of the sound would i probably record without the Isolator. Just for patchings sake was it good with the Isolator anyway . ( i´ve put then this kind of sounds into my focus after those very first bassy impressions )
in some cases was no difference at all recognisable to me, or just super subtle.
so i´d say it shifts the frequenzy content a bit, more bass , less highs and anyway less agressive highs, shaping transients off in the highs i suspect.
which should be a very welcome thing i guess wink
Just that i personally often do the sharp hi-freq and/or aliasing thing wink lol



i think the module is supergreat ! and for that price anyway !!
I´d say: just don´t expect this module to sound neutral !
in some cases it will do. my guess is that most people will find it a win for most sound/patch cases. Could even be interesting to have it just for some subtle soundshaping purposes


( the high freq content thing was tested with patching over a "Grinder" circuit ( which i know very well/ makes a difference wink ), for those who know it. Its part of the CGS29 wavefolder PCB )
igorrr
Here is the current list of Isolator distributors:
https://www.schneidersladen.de/en/happy-nerding-isolator.html
http://www.midiamsterdam.nl/happy-nerding-isolator.html
https://soundria.com/happy-nerding-isolator.html
https://www.signalsounds.com/happy-nerding-isolator-eurorack-audio-i-o -module
igorrr
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