Re: laptop causes noise when plugged in to AC - anyone else?

[andy butler <akbutler@tiscali.co.uk>]

cpr@musetrap.com wrote:
> I had this problem and solved it by lifting the ground pin on the laptop 
> power supply... done easily with a, less than a dollar, 3->2 prong 
> adapter from the hardware store..

that's possibly what I'd do too ;-)

...but wherever you see that technique mentioned 
there's always text saying "don't do it, it's not safe!".

Standard  solutions (apart from using batteries)are  

1) get a psu that's designed to run without earth connection
2) use isolating transformers on the audio (some affect on sound)

Krispen's "RFI filter" also looks a good solution, if he'd tell us 
whether it's for the audio or the mains.

andy


> 
> -cpr
> 
> Quoting Per Boysen <perboysen@gmail.com>:
> 
>> This was up on the Ableton Live forum many years ago, since Ableton
>> used to run very well on Windows in the pre Mac/Intel days. I've never
>> had this problem myself, mostly having used Macs and probably had a
>> bunch of luck with the one PC laptop I've had for audio. As I remember
>> that thread most people seemed to load up there batteries before the
>> gig and not use the power adapter. Everyone that had the issue
>> reported that the problem disappeared on batteries. And this is the
>> first time in a long time I've even heard about this problem, I
>> actually thought it was history by now.
>>
>> Greetings from Sweden
>>
>> Per Boysen
>> www.boysen.se
>> www.perboysen.com
>>
>>
>>
>> On Sat, Feb 7, 2009 at 10:08 PM, J Johans <parispro00@hotmail.com> 
>wrote:
>>> just curious if this is common or if im the lucky winner-
>>> my dell vostro seems to dirty my power when i have it plugged in-
>>> it causes my 2 fantom sound modules to emit some weird noises....its 
>low
>>> volume but stil annoying...sounds like there is a squirrel in my 
>>> headphones-
>>> when i unplug the power adapter for the cpu...the noises go away
>>> just curious if anyone else has had this problem..?
>>> only pc?..
>>
>>
> 
> 
>