29 Nov
2009
29 Nov
'09
12:51 p.m.
Hey Fons,
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(a)kokkinizita.net> wrote:
On Sun, Nov 29, 2009 at 03:16:33PM +0000, Andrew C
wrote:
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...
325.3 Hz and harmonics, either from digital circuits in your
keyboard, or from a switching power supply.
Is the keyboard itself grounded ? If not try that first (if
it has a ground pin...)
Could a DI box solve this problem?
One that provides ground separation (i.e. with
a transformer) probably will.
Ciao,
--
FA
Io lo dico sempre: l'Italia è troppo stretta e lunga.