Doepfer

Thanks Laurie -- 

I will look into this!

Cheers,
Jon

--- In Doepfer_a100@yahoogroups.com, "Elby Designs" <elby_designs@...> wrote:
>
> Hi,
> 
> I have come in to this thread part way through so may have missed something
> in which case I apologise.
> 
> An isolating USB has its own dedicated power supply (small wall-wart) which
> powers one side of the USB while the other side is powered from the primary
> device
> 
> I had a customer approach me a short while ago with a noise problem in his
> recording studio. The problem only existed when he connected to his
> audio-card which was part of his laptop computer. Laptops 9and most other
> computers) are notoriously bad for noise when connected to other equipment
> so I suggested he try this
> 
> http://www.dontronics-shop.com/usb-iso-low-full-speed-usb-isolator.html
> 
> The problem disappeared immediately and they haven't had a problem since.
> 
> This unit is about USD$40
> 
> Best Regards
> Laurie Biddulph
> Mobile: 0400 257 645
> Phone: +61 (0)2 4340 0938
> Web: www.elby-designs.com
> Skype: widgetoz
> 
> Elby Designs
> 9 Follan Close
> Kariong
> NSW 2250
> Australia
> 
> -----Original Message-----
> From: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] On
> Behalf Of codotinc
> Sent: Saturday, June 01, 2013 2:23 PM
> To: Doepfer_a100@yahoogroups.com
> Subject: [Doepfer_a100] Re: Doepfer 6U Suitcase making sounds
> 
> 
> 
> 
> Thanks Laurie -- 
> 
> Not sure exactly what an isolating USB is, so a quick Google shows me that
> USB isolators are around $100?! 
> 
> Perhaps I'm not getting what you mean? Can you suggest a way to isolate the
> USB -- and this would still provide power for the audio interface?
> 
> Best,
> Jon
> 
> --- In Doepfer_a100@yahoogroups.com, "Elby Designs" <elby_designs@>
> wrote:
> >
> > You could try using an isolating USB.
> > 
> > 
> > Best Regards
> > Laurie Biddulph
> > Mobile: 0400 257 645
> > Phone: +61 (0)2 4340 0938
> > Web: www.elby-designs.com
> > Skype: widgetoz
> > 
> > Elby Designs
> > 9 Follan Close
> > Kariong
> > NSW 2250
> > Australia
> > 
> > 
> > -----Original Message-----
> > From: Doepfer_a100@yahoogroups.com 
> > [mailto:Doepfer_a100@yahoogroups.com] On Behalf Of codotinc
> > Sent: Saturday, June 01, 2013 6:41 AM
> > To: Doepfer_a100@yahoogroups.com
> > Subject: [Doepfer_a100] Re: Doepfer 6U Suitcase making sounds
> > 
> > Hi Dieter and Florian --
> > 
> > Thanks for your replies. 
> > 
> > Florian: you were right in your diagnosis -- it was my USB-powered 
> > audio interface. The synth was totally quiet until I plugged it into 
> > the interface.
> > 
> > So, that's sorted but it's a bit of a pain! Now I need to get a new 
> > audio interface?!
> > 
> > Thanks for your help -- glad to know that my PSU is not stuffed.
> > 
> > Kind regards,
> > Jon
> > 
> > --- In Doepfer_a100@yahoogroups.com, Florian Anwander <fanwander@> wrote:
> > >
> > > Hello
> > > 
> > > to both Nathan and Jon: is this a mechanical sound or does it come 
> > > from the speakers?
> > > 
> > > If it comes from the speakers, disconnect the audio out from the 
> > > A100 system, and connect a headphone with a mini jack connector to 
> > > the output of the last module in the audio chain (example: VCA or 
> > > mixer) and turn it up. Do you still hear the noise?
> > > 
> > > If yes, then the problem is in the A100
> > > 
> > > If no, then the problem is in the combination of the A100 with the 
> > > rest of your system
> > > 
> > > 
> > > To Jon:
> > > Do you use an computer with and USB Audio interface?
> > > If yes: Is the interface USB-powered?
> > > If yes: use an interface with an separate power supply.
> > > 
> > > USB-power on Audiointerfaces in a studio like environment introduces 
> > > HF from the digital signals of the computer in the audio ground. 
> > > Those are useful only for standalone usage.
> > > 
> > > 
> > > Florian
> > >
> > 
> > 
> > 
> > 
> > ------------------------------------
> > 
> > Yahoo! Groups Links
> >
> 
> 
> 
> 
> ------------------------------------
> 
> Yahoo! Groups Links
>