Hey Rich,<br><br>Yeah, I plugged both keyboard and amp into different outlets, and I got the same noise. :/<br><br>Will, I'll test that out tommorrow, when I get a 9 volt battery or two.<br><br>Also, just for the hell of it, I'll get a DI box anyway, just to see if it does anything for it.<br>
<br>Andrew.<br><br><div class="gmail_quote">On Sun, Nov 29, 2009 at 6:31 PM, Ricardus Vincente <span dir="ltr"><<a href="mailto:wizardofgosz@gmail.com">wizardofgosz@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
On Sun, 2009-11-29 at 18:44 +0100, <a href="mailto:fons@kokkinizita.net">fons@kokkinizita.net</a> wrote:<br>
<br>
Are you plugging the devices into different outlets?<br>
<br>
Rich...<br>
<div class="im"><br>
<br>
> > How can I check if the keyboard/power supply is grounded? The power supply<br>
> > itself is a three pronged one....<br>
><br>
> Then in most countries it is required by law to be<br>
> effectively grounded. Next question is if you power<br>
> socket is... It should be if it accepts the plug.<br>
><br>
> Since you also have this interference with an amp,<br>
> but not with the headphones it really seems to be<br>
> a grounding problem.<br>
><br>
> To only other way to explain it would be to assume<br>
> it's some high-frequency stuff which your headphones<br>
> would just ignore, but any active input such the amp<br>
> or soundcard could demodulate into the audio band.<br>
><br>
> If you're using a laptop, does running it on battery<br>
> make a difference ?<br>
><br>
> Anyway I'd try a DI box, it's good practice anyway with<br>
> all instruments.<br>
><br>
> Ciao,<br>
><br>
<br>
</div><div><div></div><div class="h5">_______________________________________________<br>
Linux-audio-user mailing list<br>
<a href="mailto:Linux-audio-user@lists.linuxaudio.org">Linux-audio-user@lists.linuxaudio.org</a><br>
<a href="http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user" target="_blank">http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user</a><br>
</div></div></blockquote></div><br>