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Sujet: Please help, I'm about to pull my hair out...

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I've been on a quest to run video.

My computer: Dell XPS m1210
2 gigs ram
1.86 ghz core 2 duo
Geforce go 7400 256 mb video card

Originally I had windows XP. The problem there was that whenever I loaded a new video, the video that was playing flickered.

I posted this problem and many people said I should upgrade to vista. I did a clean install of vista, and this fixed the problem (mostly - the video still freezes for a split second whenever I load a new video) but then I got audio pops! I was using the serato SL1 box as an ASIO sound card (I got more pops when I used it as the SL1 option)

So I thought I would pick up Numark Virtual Vinyl, in the hopes that the numark sound card would take care of the pops.

WELL, the pops are gone (at least so far, I've been playing a video for the past 10 minutes and not a single pop, so that's a good sign) but now I've once again traded an old problem for a new one.

I hooked my computer up to my tv via an s-video cable that runs through a converter to rca video. When I do this I get the LOUDEST HUMMING SOUND. Using the SL1 card I got no hum.

I'm at my wit's end. I've got a great computer, and every time I solve one problem I get a new one. Any ideas?
 
Posté Fri 03 Aug 07 @ 4:49 am
 
The problem is that I can't take the ground loop out of a club system - I need to know that this card will work anywhere. I've never had a problem like this with any other card. Maybe the card is bad?
 


Get a ground loop eliminator, its cheap. at your local radio store.
 
but since the hum is caused by me hooking up the s-video to the tv, what do I hook up to the ground loop eliminator?

If I have to hook the tv up to it, that puts me back at square one, since I can't expect to be able to do that at a club.

Thanks for your help!!! :P
 


The hum is caused by a power loop, conflicting hardware that causes the hum. So the ground loop eliminator goes to the power supply of your laptop, regardless of what hardware (your case the s-video cable) seems to trigger it.

Its easy to test if you really have a ground loop problem.

Connect your s-video, and you get a hum right?
Disconnect the power supply, and run on batteries....
Hum gone right? ;)

So get a ground loop eliminator for the power supply. Its a VERY important device or any dj that plays at different locations, because one never know when the very common problem of groud loop triggers
 
Nope, there is no change to the hum when I unplug the laptop's power. :/

Thanks for working with me Norway, I hope I can figure this out.
 


ups, the hum is not gone when runnin on batteries?

Huston, we got a problem.. damn

It might still be ground loop, but unlikely..
Its probably a hardware sharing conflict between the S-video out and the VV card.

Try using a different usb port, most prefferably on the OTHER side of the laptop if you can/have
 
Cut away the ground pin of your plug!!! (or remove it by disassembling it)
 
TexZK wrote :
Cut away the ground pin of your plug!!! (or remove it by disassembling it)



Do not do that. Get this. Or go to Home Depot and get one of those little grey 3 prong to 2 prong adapters, with the little green tab.

Also, what's with this s-video to converter to RCA? Is this one of those inline converters? Try removing that, and use VGA or DVI.
 
I don't think it's ground loop - the sound is the same whether or not the computer is plugged in. I'm getting a new numark VV box tonight (if it comes in) so I'll try that one and see if it was just a bad sound card.
 
Solved?

I got the new card last night, and to my dismay, the buzzong sound was there.

Then I tried using each usb port on my laptop, no change.

I unplugged the laptop - no change.

Then I had a random idea - I'm using a Pioneer DJM400 mixer that does not have balanced outputs, could that be the problem? So I hooked this up: http://www.guitarcenter.com/shop/product/buy_radial_prod2_passive_stereo_direct_box?full_sku=153916

The hum was gone - sounded great.

I hooked the setup to a pioneer djm 600 (which has balanced outputs) and no hum.

So, I'm still scratching my head as to why the numark card cares about the type of output the mixer has. I've used 5 different cards and the numark card is the only one that has ever presented this problem.

I'm still going to work the issue, since most club mixers don't have balanced output for their monitor speakers. if the hum is coming through the monitors I'm back to square one.
 


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