[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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