On Tue, 31 Mar 2015 19:06:23 +0000 Fons Adriaensen <fons@xxxxxxxxxxxxxx> wrote: > On Tue, Mar 31, 2015 at 01:46:40PM -0500, Chris Caudle wrote: > > On Tue, March 31, 2015 12:36 pm, Patrick Shirkey wrote: > > > That person might not have much money but they might have the time to > > > figure out where the buzz comes from and do something productive. Who > > > knows they might even be able to provide useful feedback to Behringer that > > > improves their Linux solutions. > > > > > > Sounds like everything else on the board was working ok so a little bit of > > > hum should be relatively easy to solve. Maybe it just needs some contact > > > spray. > > > > That type of problem is indicative of poor circuit reference conductor > > routing (colloquially called "ground loop" or "pin 1 problem") and can > > sometimes be improved with judicious use of added wire or copper foil tape > > connections, but often requires a new and proper PCB layout to correct. > > It is basically just sloppy layout work by the design team. > > Right. And in cheap mixers like this one, everything including connectors, > pots and switches will be on a single PCB, and there's no way to change > anything much unless you decide to drill some holes in it. > > And BTW, it was not 'a little bit of hum' but a ot of it, and new > equipment should't need contact spray (and it won't help for this > kind of problem either). > > Ciao, Actually, the problem could be as simple as something like a missing nylon washer when the kit was assembled so something gets connected to the case when it shouldn't. I've had that sort of thing crop up. The other extreme of course is the case not grounded and acting like a nice pickup source. -- Will J Godfrey http://www.musically.me.uk Say you have a poem and I have a tune. Exchange them and we can both have a poem, a tune, and a song. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx http://lists.linuxaudio.org/listinfo/linux-audio-user
