[ddots-l] Re: laptop power problems
- From: "Mark Brierley" <mark.brierley@xxxxxxxxxxxxx>
- To: <ddots-l@xxxxxxxxxxxxx>
- Date: Tue, 26 Jan 2010 09:03:30 -0000
Hi Dave,
Many thanks to you and all the others for the ideas.
I'm not sure whether Steve's solution would work as my laptop is connected
via firewire to an FW1884.
Like you, i'm pretty sure its not a ground loop. The frequency of the noise
is far too high for that. I'm using a 3 pin plug as i'm over in the UK.
I've tried plugging it in on the same outlet as my mixer and speakers etc.
I have also tried to plug it in in another room, but the problem persists.
I'm not subscribing to the midi mag list at the moment. I however will try
your other suggestions, and would like to thank you all again for your help.
Cheers
Mark
-----Original Message-----
From: ddots-l-bounce@xxxxxxxxxxxxx [mailto:ddots-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Dave Carlson
Sent: 25 January 2010 18:10
To: ddots-l@xxxxxxxxxxxxx
Subject: [ddots-l] Re: laptop power problems
Mark,
Follow-on. Dennis' suggestion of the power outlet brings up a couple other
thoughts.
1. Make sure your power outlet (ac mains) is truly grounded and. If your ac
mains plug for the power supply is a two-prong plug, then make sure you've
got it plugged in with the correct polarity.
2. Make sure that you plug your power supply into the same outlet (or at
least the same circuit) as your mixer, keyboard, and other audio gear, so
that they are all on the same phase of the feed power coming in to your
building breaker box. If you connect equipment to two different phases of
the power input (two different circuit breakers) you can have a voltage
differential between the neutral and/or hot lines.
Dave
----- Original Message -----
From: Mark Brierley <mailto:mark.brierley@xxxxxxxxxxxxx>
To: ddots-l@xxxxxxxxxxxxx
Sent: Monday, January 25, 2010 08:54
Subject: [ddots-l] laptop power problems
Hi list,
Just a quick question which might be very difficult to answer!
I've bought a new laptop for my pro audio setup. The laptop is custom built
by Music PC in the UK. I plugged it all in with my gear over the weekend,
and get a horrendous high pitched noise over my speakers and mixer. It is
quite clearly the power supply, as when the laptop is running on batteries,
there is no noise at all. I have had this problem a couple of times when
out doing live shows, but never really found the solution.
Am I right in saying that it isn't a ground loop? It is my understanding
that ground loops are at a far lower pitch. If anyone has got any ideas on
how to get rid of this horrible noise, I would be very grateful.
Many thanks
Mark
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