18 Feb
2003
18 Feb
'03
1:56 p.m.
Hallo,
my Edirol UA-20 USB audio device has arrived, and I also got it to
work: It was almost plug and play. But now I have a serious problem,
and that is noise when moving the mouse. I'm at loss what to do.
Everytime I move the pointer with mouse or touchpad on my Acer
Travelmade, the UA-20 produces nasty screetching, crackling and
scratching. This doesn't happen, when I unplug the power supply. The
UA-20 gets its power from the USB-port, so I suspect that this creates
the conflicts.
Does anyone have an idea how to get rid of this noise? Or should I
send back the USB device?
Thanks for any help...
ciao
--
Frank Barknecht _ ______footils.org__
18 Feb
18 Feb
2:51 p.m.
I assume you're using a laptop. I've noticed a similar issue on other
laptops (Dell notebooks and Apple powerbooks have similar issues). It's
simply because when the laptop is hooked up into a wall, the current
that travels near the main motherboard in order to get to the charging
battery causes interference. You may want to try using your laptop
hooked up into external power but without the battery in the laptop
itself and if the noise is then gone, then that is definitely what is
causing it.
Other option is that even if the battery is out and it still makes
noise, that your external power connection is too close to the USB
controller of some sorts (or even the USB connector) causing similar
interference.
Just a thought.
Ico
-----Original Message-----
From: linux-audio-user-admin(a)music.columbia.edu
[mailto:linux-audio-user-
admin(a)music.columbia.edu] On Behalf Of Frank
Barknecht
Sent: Tuesday, February 18, 2003 12:49 PM
To: linux-audio-user(a)music.columbia.edu
Subject: [linux-audio-user] My Edirol UA-20 arrived, but now I have a
big
problem!
Hallo,
my Edirol UA-20 USB audio device has arrived, and I also got it to
work: It was almost plug and play. But now I have a serious problem,
and that is noise when moving the mouse. I'm at loss what to do.
Everytime I move the pointer with mouse or touchpad on my Acer
Travelmade, the UA-20 produces nasty screetching, crackling and
scratching. This doesn't happen, when I unplug the power supply. The
UA-20 gets its power from the USB-port, so I suspect that this creates
the conflicts.
Does anyone have an idea how to get rid of this noise? Or should I
send back the USB device?
Thanks for any help...
ciao
--
Frank Barknecht _ ______footils.org__
5:53 p.m.
Hallo,
Ivica Bukvic hat gesagt: // Ivica Bukvic wrote:
I assume you're using a laptop. I've noticed a
similar issue on other
laptops (Dell notebooks and Apple powerbooks have similar issues). It's
simply because when the laptop is hooked up into a wall, the current
that travels near the main motherboard in order to get to the charging
battery causes interference. You may want to try using your laptop
hooked up into external power but without the battery in the laptop
itself and if the noise is then gone, then that is definitely what is
causing it.
I didn't try that, but I'll do, maybe tomorrow.
Other option is that even if the battery is out and it
still makes
noise, that your external power connection is too close to the USB
controller of some sorts (or even the USB connector) causing similar
interference.
I could verify now, that it must be something with the power supply. I
took everything except my amp over to my friends room, plugged it into
her amplifier and didn't get noise anymore.
Thinking about it, I have a whole bunch of electrical devices
plugged-in in my room. Maybe I have reached the final frontier for my
connections and need to get a new one. But I'm glad, that the hardware
and especially the notebook seems to be okay.
ciao
--
Frank Barknecht _ ______footils.org__
5:05 p.m.
New subject: [linux-audio-user] Re: My Edirol UA-20 arrived, but now I have a big problem!
Hallo,
Frank Barknecht hat gesagt: // Frank Barknecht wrote:
my Edirol UA-20 USB audio device has arrived, and I
also got it to
work: It was almost plug and play. But now I have a serious problem,
and that is noise when moving the mouse. I'm at loss what to do.
Everytime I move the pointer with mouse or touchpad on my Acer
Travelmade, the UA-20 produces nasty screetching, crackling and
scratching. This doesn't happen, when I unplug the power supply. The
UA-20 gets its power from the USB-port, so I suspect that this creates
the conflicts.
Does anyone have an idea how to get rid of this noise?
Another self-reply, sorry. But: I could remove the buzzing by going
with all my stuff (notebook, UA-20, power supply) into another room
and connecting it to another amplifier. So it seems, I am prey of a
buzz-loop (is that the word for "Brummschleife"?) in my room.
ciao
--
Frank Barknecht _ ______footils.org__
5:28 a.m.
New subject: [linux-audio-user] Re: My Edirol UA-20 arrived, but now I have a big problem!
martedì, 18 febbraio 2003 alle 20:19:19, Frank Barknecht ha scritto:
> my Edirol UA-20 USB audio device has arrived, and
I also got it to
> work: It was almost plug and play. But now I have a serious problem,
> and that is noise when moving the mouse. I'm at loss what to do.
> Everytime I move the pointer with mouse or touchpad on my Acer
> Travelmade, the UA-20 produces nasty screetching, crackling and
> scratching. This doesn't happen, when I unplug the power supply. The
> UA-20 gets its power from the USB-port, so I suspect that this creates
> the conflicts.
>
> Does anyone have an idea how to get rid of this noise?
Hello, Frank
I have the same identical problem with my ibook and Roland SCD70.
I thought that it was related to the fact SCD70 has separate power
supply, but now I suspect it's like Ivica pointed out (the charging
circuit for the battery).
BTW, are you able to run jackd with the UA-20?
I get a message saying "your device either doesn't support one of the
two sample format jack can use" or something similar...
Ciao
--
.---------------------.
| Emiliano Grilli |
| emillo(a)libero.it |
| Linux user #209089 |
'---------------------'
6:09 a.m.
New subject: [linux-audio-user] Re: My Edirol UA-20 arrived, but now I have a big problem!
BTW, are you able to run jackd with the UA-20?
I get a message saying "your device either doesn't support one of the
two sample format jack can use" or something similar...
I have the same problem with my usb imic. Has anyone got jackd
running with a usb audio interface? The sound is clipped with pd/ alsa
as well.
(no ground loop hum on the imic though - maybe because its low
power)
cheers
matthew
6:46 a.m.
New subject: [linux-audio-user] Re: My Edirol UA-20 arrived, but now I have a big problem!
mercoledì, 19 febbraio 2003 alle 09:55:07, matthew yee-king ha scritto:
I have the same problem with my usb imic. Has anyone got jackd
running with a usb audio interface? The sound is clipped with pd/ alsa
as well.
(no ground loop hum on the imic though - maybe because its low
power)
Yes, I have the imic too and same problem (and no hum).
Also, I have to say that the imic has not so good quality: the
background hiss is far more high than the Roland.
Cheers
--
.---------------------.
| Emiliano Grilli |
| emillo(a)libero.it |
| Linux user #209089 |
'---------------------'
7:06 a.m.
New subject: [linux-audio-user] Re: My Edirol UA-20 arrived, but now I have a big problem!
On Wed, 19 Feb 2003 09:55:07 +0000, matthew yee-king wrote
I've been using jack with an m-audio quattro for a week or so with no problems
so far.
dave
BTW, are you
able to run jackd with the UA-20?
I get a message saying "your device either doesn't support one of the
two sample format jack can use" or something similar...
I have the same problem with my usb imic. Has anyone got jackd
running with a usb audio interface? 
7:01 a.m.
New subject: [linux-audio-user] Re: My Edirol UA-20 arrived, but now I have a big problem!
On Tue, Feb 18, 2003 at 08:19:19PM +0100, Frank Barknecht wrote:
Hallo,
Frank Barknecht hat gesagt: // Frank Barknecht wrote:
Yup, I've had ground loops on my dell when connecting to a projector and a
mixer. Put a DI box between the laptop and amp or unplug from the mains :)
- Steve
my Edirol UA-20 USB audio device has arrived, and
I also got it to
work: It was almost plug and play. But now I have a serious problem,
and that is noise when moving the mouse. I'm at loss what to do.
Everytime I move the pointer with mouse or touchpad on my Acer
Travelmade, the UA-20 produces nasty screetching, crackling and
scratching. This doesn't happen, when I unplug the power supply. The
UA-20 gets its power from the USB-port, so I suspect that this creates
the conflicts.
Does anyone have an idea how to get rid of this noise?
Another self-reply, sorry. But: I could remove the buzzing by going
with all my stuff (notebook, UA-20, power supply) into another room
and connecting it to another amplifier. So it seems, I am prey of a
buzz-loop (is that the word for "Brummschleife"?) in my room.
20 Feb
20 Feb
3:09 p.m.
New subject: [linux-audio-user] Re: My Edirol UA-20 arrived, but now I have a big problem!
Hi Steve,
Steve Harris hat gesagt: // Steve Harris wrote:
Yup, I've had ground loops on my dell when
connecting to a projector
and a mixer. Put a DI box between the laptop and amp or unplug from
the mains :)
Seems I'm bitten really really hard by this ground loop problem, so
hard that I
a) am desperate and
b) might need to return the box and shell out 100 EUR more for
a Quattro. But I'm not sure, if I get the ground loop again...
So I'd like to try a direct input box at first. Can you recommend a
device? Normally I only connect to my hifi amp, so cinch-cinch
connections would be fine. I did a bit of googling and found, that
passive DI boxes are the way to go in my situation. Or the Monacor
FGA-40, which is simply a cinch-cinch cable with a heavy ground filter
in the middle and is around 20 EUR.
OTOH, this one: http://www.interspaceind.co.uk/pcaudiobb.php, is way
too expensive...
--
Frank Barknecht _ ______footils.org__
4:04 p.m.
New subject: [linux-audio-user] Re: My Edirol UA-20 arrived, but now I have a big problem!
Steve Harris hat gesagt: // Steve Harris wrote:
> Yup, I've had ground loops on my dell when connecting to a projector
> and a mixer. Put a DI box between the laptop and amp or unplug from
> the mains :)
I've also found that (here in the US)
I can get by with plugging the laptop power supply into one of those
adapters that's supposed to be used to connect a 3-prong plug into
a 2-prong socket, with a little metal tab you're supposed to connect
to the socket's mounting screw to provide ground; but which
can also be used to break the ground connection just by ignoring
the little tab. For me, that kills the noise.
I suspect that a mains isolation transformer might also do the trick,
but I don't have one to try.
of course, the ground pin is provided for a reason...
so please don't sue me if you fry your laptop, or yourself.
YMMV and all that.
--
Paul Winkler
home: http://www.slinkp.com
"Muppet Labs, where the future is made - today!"
4:13 p.m.
New subject: Ground loop solved! [Was: [linux-audio-user] Re: My Edirol UA-20 arrived, ...]
Hallo,
okay, I solved my problem somehow with a lot of cable reorganising.
Now the loop is gone, if I don't plug in my main computer's (not
mobile) soundcard into the amp.
This is okay, but now I always have to do a lot on un/in-plugging.
Think I'll need a mixer now...
ciao
--
Frank Barknecht _ ______footils.org__
5:16 p.m.
New subject: Ground loop solved! [Was: [linux-audio-user] Re: My Edirol UA-20 arrived, ...]
On Thu, Feb 20, 2003 at 09:05:14PM +0100, Frank Barknecht wrote:
Hallo,
okay, I solved my problem somehow with a lot of cable reorganising.
Now the loop is gone, if I don't plug in my main computer's (not
mobile) soundcard into the amp.
This is okay, but now I always have to do a lot on un/in-plugging.
Think I'll need a mixer now...
get a mackie! i've been gigging my 1402 for a while now and its solid.
is the midi on the edirol working yet ;) ?
i'm very interested in this long, multi list story as i'm thinking of buying a
decent usb soundcard
cheers
matthew
6:50 p.m.
New subject: Ground loop solved! [Was: [linux-audio-user] Re: My Edirol UA-20 arrived, ...]
Hallo,
Matthew Yee-King hat gesagt: // Matthew Yee-King wrote:
get a mackie! i've been gigging my 1402 for a
while now and its solid.
Looks nice, but normally I only have 2(-4) outputs. And I probably only
can afford the Mackie 1402VLZD Bag...
is the midi on the edirol working yet ;) ?
Nope, not yet. Maybe it's the hardware, I'll take it to office
tomorrow, where I can acces Win2000 PCs to test it. I need midi, so
I'll keep digging.
i'm very interested in this long, multi list story
as i'm thinking
of buying a decent usb soundcard
The audio part of the UA-20 is quite good, IMO. But you should better
not buy it on mailorder, like I did, but instead go to a shop and test
it with your hardware. You can preconfigure the alsa-modules, then
it's plug'n'play (or die).
ciao
--
Frank Barknecht _ ______footils.org__
7951
days inactive
7953
days old
linux-audio-user@lists.linuxaudio.org
14 comments
8 participants
participants (8)
-
Dave Griffiths -
Emiliano Grilli -
Frank Barknecht -
Ivica Bukvic -
Maarten de Boer -
matthew yee-king -
Paul Winkler -
Steve Harris