[ddots-l] Re: external usbcard with sonar on a laptopRe: Re: sonar problem-dropout!

But 110VAC is 110VAC and divergent ground potentials are divergent ground 
potentials in any world you're end.  A shock is a shock, and when your hands 
are on two sides of that different ground potential the current goes right 
through your heart.  I can think of pleasanter ways to commit suicide.  (grin)

Nick

On Fri, 29 Feb 2008 11:30:01 -0500, Gordon Kent wrote:

I just use a ground lift.  I don't think it is a major problem because the 
in line power supply converts to DC anyway, and compared to other equipment 
a laptop does not draw much AC current.  ALso there is no metal chasis to 
conduct current like there can be on something like a power amp or other 
rack mount piece.  I would never do this with a regular PC, for example.
Gord
----- Original Message ----- 
From: "John Fioravanti" <fioresq1@xxxxxxxxxxx>
To: <ddots-l@xxxxxxxxxxxxx>
Sent: Friday, February 29, 2008 5:23 AM
Subject: [ddots-l] Re: external usbcard with sonar on a laptopRe: Re: sonar 
problem-dropout!


Gord: are you saying you use the ground lifter, or do you use a power
conditioner?  John Fioravanti
----- Original Message ----- 
From: "Gordon Kent" <dbmusic@xxxxxxxxxxxx>
To: <ddots-l@xxxxxxxxxxxxx>
Sent: Friday, February 29, 2008 12:28 AM
Subject: [ddots-l] Re: external usbcard with sonar on a laptopRe: Re: sonar
problem-dropout!


> Well, it sure solved the problem for me.  Most laptops don't have ground 
> pins on them anyway, this is just a new thing.
> Gord
> ----- Original Message ----- 
> From: "Mike C" <m_dsmusic@xxxxxxxxxxxx>
> To: <ddots-l@xxxxxxxxxxxxx>
> Sent: Wednesday, February 27, 2008 11:42 PM
> Subject: [ddots-l] Re: external usbcard with sonar on a laptopRe: Re: 
> sonar problem-dropout!


> A Ground lifter actually lifts the ground on your device, there by making 
> it
> more prone to spark damage.  I would invest in a powerbar which has the
> special filters against noise hum.  Its going to cost you for the powerbar
> but in the long run its worth it.  Firmen makes a rack mountable version,
> and its really good.
> ----- Original Message ----- 
> From: "John Fioravanti" <fioresq1@xxxxxxxxxxx>
> To: <ddots-l@xxxxxxxxxxxxx>
> Sent: Wednesday, February 27, 2008 6:12 PM
> Subject: [ddots-l] Re: external usbcard with sonar on a laptopRe: Re: 
> sonar
> problem-dropout!


>> Hi: why is that?
>> ----- Original Message ----- 
>> From: "Kevin Gibbs" <kevjazz@xxxxxxxxx>
>> To: <ddots-l@xxxxxxxxxxxxx>
>> Sent: Wednesday, February 27, 2008 3:46 PM
>> Subject: [ddots-l] Re: external usbcard with sonar on a laptopRe: Re: 
>> sonar problem-dropout!
>>
>>
>>>A groundlifter?  Not a good idea in many caes.
>>>
>>>
>>> -----Original Message-----
>>> From: ddots-l-bounce@xxxxxxxxxxxxx [mailto:ddots-l-bounce@xxxxxxxxxxxxx] 
>>> On
>>> Behalf Of John Fioravanti
>>> Sent: Wednesday, February 27, 2008 4:25 AM
>>> To: ddots-l@xxxxxxxxxxxxx
>>> Subject: [ddots-l] Re: external usbcard with sonar on a laptopRe: Re: 
>>> sonar
>>> problem-dropout!
>>>
>>>
>>> Brian: I tried a adapter plug (3 to 2) and I don't have the hum anymore
>>> ----- Original Message -----
>>> From: "Bryan Smart" <bryansmart@xxxxxxxxxxxxxx>
>>> To: <ddots-l@xxxxxxxxxxxxx>
>>> Sent: Wednesday, February 27, 2008 4:45 AM
>>> Subject: [ddots-l] Re: external usbcard with sonar on a laptopRe: Re: 
>>> sonar
>>> problem-dropout!
>>>
>>>
>>> A lot of audio interfaces have this hum when they run off of USB power. 
>>> As
>>> you say, this does not happen when the laptop is running off of the 
>>> battery.
>>>
>>> If your interface has its own power cable, then you should use that 
>>> instead
>>> of running off of the laptop's power. In many cases, this will get rid 
>>> of
>>> the hum.
>>>
>>> Bryan
>>>
>>> -----Original Message-----
>>> From: ddots-l-bounce@xxxxxxxxxxxxx [mailto:ddots-l-bounce@xxxxxxxxxxxxx]
>>> On Behalf Of John Fioravanti
>>> Sent: Friday, February 22, 2008 6:31 AM
>>> To: ddots-l@xxxxxxxxxxxxx
>>> Cc: midimag@xxxxxxxxxxx
>>> Subject: [ddots-l] external usbcard with sonar on a laptopRe: Re: sonar
>>> problem-dropout!
>>>
>>> Hi: When I plug the usb fast track delta card into a laptop on stage,
>>> there's a terrible hum when I use ac power.  The battery stops it.  Do 
>>> any
>>> ofyou have this same problem with the usb cards?  Should a pci work 
>>> better?
>>> John Fioravanti
>>>
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>>
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> PLEASE READ THIS FOOTER AT LEAST ONCE!
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> PLEASE READ THIS FOOTER AT LEAST ONCE!
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