On Wed, 18 Feb 2009 04:04:57 +0000 pete shorthose <zenadsl6252@xxxxxxxxx> wrote: > On Tue, 17 Feb 2009 21:02:02 -0500 > carmen <_@xxxxxxxxxxxxxxx> wrote: > > > > It may just be that it took the introduction of better quality gear for me to hear the effects above the usual > > > din but then these static like snapping noises are very distinct. > > > > the suggested ground topology is a star or radial shape, > > > > path to ground from each device is never thru another device, and potentials are as similar as possible > > I have an approximate radial setup but the mixer would be the hub. Thing is and as I said, I've tried to > use some of these things in isolation. (only the zoom H4 or only the mixer, both have integral monitoring so > no need for an amp or pc) but I still see it. (well, hear it) > > > do you have a metal radiator pipe? or barring that a 3 prong wiring? > > Ah, moved the radiator recently. I could run a cable tho. > > > are you using 2-pronged gear or 3? it may be that your house ground is not properly grounded (bad) > > well AFAIK, the house is grounded and being in the UK the sockets are all 3 pronged. that said, I'm pretty sure > that non of them use the 3rd prong. (plastic tab instead of a metal prong or 2 core flat cables) > > > or strong induced currents from close 60hz mains cabling (perhaps even 120v is enough at a close distance) > > > > i use alligator-clipp terminated cables, to grip onto the metal box around a USB port, > > > > then hook that to the negative battery terminal of my amp. then tap this wire and connect to the radiator pipe > > > > (shuts shit up pretty good)......... > > Cool, ty. I'll try a few things. I'll also say goodbye now in case I'm found dead tomorrow with a spectacular new > hairstyle. Problem solved I think. I tried using someone's Dell XPS laptop (almost identical to my 9400) and the problems disappeared. Indeed, noise levels dropped vs using the devices in isolation. The difference? The 9400 has a 3 core earthed AC adaptor and non of my other gear is earthed at all. After googling around I also discovered that this is why I've been getting electric shocks from the metal parts on my 9400 so hopefully I can get an earthed AC adapter for this laptop. pete . _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/mailman/listinfo/linux-audio-user
