13 Jul
2014
13 Jul
'14
3:37 p.m.
Hi,
On Sat, 12 Jul 2014 09:17:02 -0700 (PDT)
Len Ovens <len(a)ovenwerks.net> wrote:
t would not effect the serial data, but audio may be
present on the same
device, or another connected to it. I have a USB audio interface that
introduces hum to the monitor amp.
A passive DI-box with ground-lift will to the trick. The problem here
is not the asymmetrical signal since the noise is not inducted to the
wire. It's that any computer introduces quite a lot of buzz and hiss to
the ground wire. You can easily hear when the cursor moves or when data
is read from hard-disc and so on.
Best, Dennis