Sergei Steshenko wrote:
On Thu, 9 Feb 2006 12:02:10 +0000
John Haxby <[EMAIL PROTECTED]> wrote:
I have a Griffin iMic which works perfectly. I think it does
everything you want, it's also cheap: mine is the older silver model and
cost $35. Haven't tried (or seen) the newer white one but I'd be very
surprised if it didn't just work. The quality is pretty good
although, for some odd reason, I can hear hum from my laptop power
supply when I connect it to an amplifier instead of headphone. I
suspect that's more a problem with the laptop rather than the iMic.
Try a thick wire to connect your laptop's ground with your
amplifier's one.
Outer connectors shields, like the ones of serial port or display
connector are good candidates to be used as ground.
That's a good idea. An earth loop does seem to be the most likely
problem. Mind you, neither the mixer nor the power amp have their own
earth so I suspect that it's the two computers that provide input to the
mixer having a bit of a fight. The Dell laptop power supply does seem
to have an earth connection. Alas, in the only case where it really
matters (in a theatre) adding an extra earth connection isn't
practical. It's a Dell laptop and seems to have an earth connection
running through the external power supply: other laptops I've used in
the past don't have an earth connection for the external power supply
and are probably just fine. I'm really not sure wh Dell think an earth
is important :-) The battery lasts long enough though ...
I was somewhat surprised at the hum, but since there isn't electrical
isolation between the audio output and the rest of the computer I
shouldn't be that surprised I suppose.
jch
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