laptop to amp noise....ground loop/hum

davidococ · 12-09-2008 08:46PM #1

using a laptop t an amp....any ideas about how to get rid of the horrible noise??

seannash · 12-09-2008 09:02PM

i hope your running the sound out of your laptop using a soundcard
if its a pc laptop the inbuilt soundcard arent really good enough to use

L1011 · 12-09-2008 09:25PM

Ferrites on the power supply cable
Ferrites on the audio cable
Higher quality / screened cables.
External sound card (I recommend Echo highly for this)
If you've got monster battery life, unplug the power supply...

davidococ · 13-09-2008 12:02AM

what are Ferrites???

when i put the laptop plug through a EU adaptor, and put that through an irish adaptor and then into the mains plug, there is no hum, its perfect...........all this just takes the earth from being used, and then it sounds perfect...also...there is a little metal thing at the back of the cd mixer, which says "grnd"...i presume i have to earth his, but this is dangerous, if i did this would it solve the problem??

davidococ · 13-09-2008 12:04AM

would this type of thing be any good

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&Item=330246195753&Category=32809&_trksid=p3907.m29

seannash · 13-09-2008 01:07AM

hang on i though you were going out of your laptop to an amp.
whats this about a cd mixer.if your using turntables(vinyl) you have to ground the deck.but im confused now because you didnt give out all the info

L1011 · 13-09-2008 05:10PM

http://en.wikipedia.org/wiki/Ferrite_bead

You can get them in Maplin or CQ Communications in Dublin although I would never, ever recommend shopping at CQ.

Super-Rush · 14-09-2008 04:30PM

Just un-earth the plugboard that you plug the ac adaptor into but dont plug anything else into it

laptop to amp noise....ground loop/hum

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