Re: [LAU] Am I experiencing ground hum or is it something else?

Just out of interest Will, I've already tried 2 separate power supply plugs
into my keyboard, and I still get an annoying noise when plugging them into
an amp/line in on my PC soundcard. The keyboard has onboard speakers, but I
can't detect any annoying noise when the keyboard volume is up full, with my
ear against the speaker...

This might be a problem with my sockets and/or my keyboard line outs being
futzed?

Thanks,

Andrew.

On Mon, Nov 30, 2009 at 7:15 AM, Will Light <visinin@email-addr-hidden> wrote:

> but I've had issues with
> noises like the one you posted that stemmed from, of all things, the
> power supply being grounded.
>
> -w
>
> On Sun, Nov 29, 2009 at 2:10 PM, Andrew C <countfuzzball@email-addr-hidden> wrote:
> > Hey Rich,
> >
> > Yeah, I plugged both keyboard and amp into different outlets, and I got
> the
> > same noise. :/
> >
> > Will, I'll test that out tommorrow, when I get a 9 volt battery or two.
> >
> > Also, just for the hell of it, I'll get a DI box anyway, just to see if
> it
> > does anything for it.
> >
> > Andrew.
> >
> > On Sun, Nov 29, 2009 at 6:31 PM, Ricardus Vincente <
> wizardofgosz@email-addr-hidden>
> > wrote:
> >>
> >> On Sun, 2009-11-29 at 18:44 +0100, fons@email-addr-hidden wrote:
> >>
> >> Are you plugging the devices into different outlets?
> >>
> >> Rich...
> >>
> >>
> >> > > How can I check if the keyboard/power supply is grounded? The power
> >> > > supply
> >> > > itself is a three pronged one....
> >> >
> >> > Then in most countries it is required by law to be
> >> > effectively grounded. Next question is if you power
> >> > socket is... It should be if it accepts the plug.
> >> >
> >> > Since you also have this interference with an amp,
> >> > but not with the headphones it really seems to be
> >> > a grounding problem.
> >> >
> >> > To only other way to explain it would be to assume
> >> > it's some high-frequency stuff which your headphones
> >> > would just ignore, but any active input such the amp
> >> > or soundcard could demodulate into the audio band.
> >> >
> >> > If you're using a laptop, does running it on battery
> >> > make a difference ?
> >> >
> >> > Anyway I'd try a DI box, it's good practice anyway with
> >> > all instruments.
> >> >
> >> > Ciao,
> >> >
> >>
> >> _______________________________________________
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> >> Linux-audio-user@email-addr-hidden
> >> http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
> >
> >
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> >
> >
>

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Received on Wed Dec 9 00:15:01 2009