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 Forum index » Clavia Nord Modular » Bugs
noises on G2X out with usb cable connected
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dorremifasol



Joined: Sep 28, 2006
Posts: 768
Location: Barcelona, Spain
Audio files: 7
G2 patch files: 47

PostPosted: Fri Oct 07, 2011 2:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

mosc wrote:
Great suggestion, dorremifasol. Do you think you could post a picture to show how you do that?


Of course, here I go.

I've uploaded some pictures with descriptions. I've also attached an audio file with the recording of my G2 using the regular cable, and then the extension with the paper. I suppose most people don't notice the noise but keep in mind that I use headphones almost always and that way is very noticeable. Moreover, once you record the audio into a DAW and start compressing the buzziness gets really loud.

The record is just the G2 straight into my Fireface 800, without any other synth turned on.

Please keep in mind that I really don't know why it works. I thought it could work and tried disabling pins until it worked. Wink


DSC00826.JPG
 Description:
You need the cable from the G2 to the PC, an USB extension cable, and a tiny bit of paper (probably thin plastic would be better).
 Filesize:  209.14 KB
 Viewed:  104 Time(s)
This image has been reduced to fit the page. Click on it to enlarge.

DSC00826.JPG



DSC00827.JPG
 Description:
This is it!
 Filesize:  212.06 KB
 Viewed:  104 Time(s)
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DSC00827.JPG



DSC00828.JPG
 Description:
You have to put the paper exactly as it is shown in the picture.
 Filesize:  242.99 KB
 Viewed:  114 Time(s)
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DSC00828.JPG



DSC00829.JPG
 Description:
I like to keep the paper visible so I will remember this is a special USB connection, otherwise I may forget (bad memory here, really).
 Filesize:  230.91 KB
 Viewed:  104 Time(s)
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DSC00829.JPG



noise.wav
 Description:
Noise from the USB connection. First silence, then connection with the regular cable, next, disconnection, and lastly connection again with the "trick" enabled.

Download
 Filename:  noise.wav
 Filesize:  2.16 MB
 Downloaded:  193 Time(s)


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dorremifasol



Joined: Sep 28, 2006
Posts: 768
Location: Barcelona, Spain
Audio files: 7
G2 patch files: 47

PostPosted: Tue Oct 11, 2011 4:29 am    Post subject: Reply with quote  Mark this post and the followings unread

Now I know why it works. I'm disabling the +5 current pin, which is the one that carries the ground loop noise and it's not needed since the G2 has its own power source. I'm planning to disable every +5 USB pin not needed in my cables (ie. other synthesizers or devices that have their own power source).

Moreover, and I think this is very important: I know that the G2 does not need the +5v USB input pin (it's only used to provide power to some USB devices like mouses, keyboards, controllers, etc), but someway the pin IS connected to the synth board because the effects on the audio signal are very noticeable.

This leads me to think it shouldn't be that way. It may well cause the USB port to break if connected and disconnected very often, or if the computer sends a unusual voltage spike trough the +5v pin. You know there are many posts about broken USB ports in the forum.

What do you think about this?

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mosc
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Joined: Jan 31, 2003
Posts: 17550
Location: Allentown, PA
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PostPosted: Thu Oct 13, 2011 9:46 am    Post subject: Reply with quote  Mark this post and the followings unread

Thanks for great post with all those pictures. Looks like a pretty easy trick to pull off.

Yes I think you're right. If the 5V is not needed in the synthesizer, then it should not be connected to any circuit.

The audio file shows a significant improvement.

Splendid...

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modulator_esp
Stream Operator


Joined: Feb 04, 2005
Posts: 2263
Location: Nottingham, UK
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PostPosted: Sun Nov 18, 2012 2:01 pm    Post subject: Reply with quote  Mark this post and the followings unread

I've just done this and it works perfectly for me Smile

Thanks dorremifasol

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Jez
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dorremifasol



Joined: Sep 28, 2006
Posts: 768
Location: Barcelona, Spain
Audio files: 7
G2 patch files: 47

PostPosted: Sun Nov 18, 2012 4:07 pm    Post subject: Reply with quote  Mark this post and the followings unread

Glad to read that, Jez! Smile

Next time I open my G2 I'll see if can cut something somewhere to avoid using the cable thingie forever.

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modulator_esp
Stream Operator


Joined: Feb 04, 2005
Posts: 2263
Location: Nottingham, UK
Audio files: 178
G2 patch files: 1

PostPosted: Sun Nov 18, 2012 5:44 pm    Post subject: Reply with quote  Mark this post and the followings unread

Good luck with that Smile
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