Doepfer

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
> >
> 
> 
> 
> 
> ------------------------------------
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