How can I check if the keyboard/power supply is grounded? The power supply itself is a three pronged one....
Thanks.
Andrew.
On Sun, Nov 29, 2009 at 3:55 PM, <fons@xxxxxxxxxxxxxxx> wrote:
On Sun, Nov 29, 2009 at 03:16:33PM +0000, Andrew C wrote:325.3 Hz and harmonics, either from digital circuits in your
> I'm just wondering, is the start of this short recording a ground hum
> loop? It appears to be a weird high pitched whine in there as well...
keyboard, or from a switching power supply.
Is the keyboard itself grounded ? If not try that first (if
it has a ground pin...)
One that provides ground separation (i.e. with
> Could a DI box solve this problem?
a transformer) probably will.
Ciao,
--
FA
Io lo dico sempre: l'Italia è troppo stretta e lunga.
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