Thank you Max, this all does sound sort of familiar. Gee it has been a while.
On Mar 3, 2009, at 2:11 PM, Max Robinson wrote: > A balanced input is accomplished using quarter inch jacks by using a > plug > and jack like the type used on stereo headphones. They are commonly > referred to as T R S which stands for tip, ring, and shield. Such > plugs use > two conductor shielded cable. The shield is connected at only one > end. To > connect a single ended output tip and shield only, to a balanced > input, at > the single ended end connect the green inner conductor to the shield > and the > red to the tip. At the other end connect the shield of the cable to > the > shield of the plug, the green wire to the ring and the red wire to > the tip. > Take a look at the following web page. > > http://www.angelfire.com/electronic/funwithtubes/Eliminating_Ground_Loops.html > > All of the diagrams have verbal descriptions. > > Regards. > > Max. K 4 O D S. > > Email: [email protected] > > Transistor site http://www.funwithtransistors.net > Vacuum tube site: http://www.funwithtubes.net > Music site: http://www.maxsmusicplace.com > > To subscribe to the fun with tubes group send an email to, > [email protected] > > ----- Original Message ----- > From: "Scott Howell" <[email protected]> > To: <[email protected]> > Sent: Tuesday, March 03, 2009 4:29 AM > Subject: Re: [BlindHandyMan] question on interference form computers > > > Hey Max I don't live near a transmitter of any sort, but a ground > loop > > would make sense. What this board has is quarter-inch inputs and one > > per channel. So, I use two inputs for stero output. I assume these > are > > balanced inputs, but I am a little embarrassed to say I don't know > > exactly the difference between the two types. I used ot know this > > stuff, but I have forgotten it oer the years. I'm not sure how I > could > > address the ground loop issue, but I have a few ideas and maybe > > disconnecting the laptop from ac power might yield some results, or > > just pulling the audio cable out of the mixer for the laptop and see > > what happens. > > > > tnx, > > > > On Mar 2, 2009, at 9:18 PM, Max Robinson wrote: > > > >> You may have a ground loop. They are very difficult to break > without > >> loosing a ground on something. If your mixer has balanced inputs it > >> might > >> be easier. I have a 12 x 4 channel mixer, an 8 track digital > recorder, > >> sound module, signal processor, and monitor amplifier, all hooked > >> together > >> and to my computer. Only one computer though. It took a lot of > making > >> special patch cords to get all the hum and other interference out > of > >> the > >> system. Do you live near a TV transmitter? I do and that was a > problem > >> too. > >> > >> Regards. > >> > >> Max. K 4 O D S. > >> > >> Email: [email protected] > >> > >> Transistor site http://www.funwithtransistors.net > >> Vacuum tube site: http://www.funwithtubes.net > >> Music site: http://www.maxsmusicplace.com > >> > >> To subscribe to the fun with tubes group send an email to, > >> [email protected] > >> > >> ----- Original Message ----- > >> From: "Scott Howell" <[email protected]> > >> To: <[email protected]> > >> Sent: Monday, March 02, 2009 4:44 PM > >> Subject: [BlindHandyMan] question on interference form computers > >> > >> > Hey folks, I have a rather interesting problem that I hope is > >> > acceptable for the list. Let me explain my setup and then I'll > >> explain > >> > the problem. > >> > > >> > I have a small mixer that has three or so inputs. I have my > >> employer's > >> > Dell laptop, my Macintosh, and a cable into which I plug my > electric > >> > bass. All this is served by one pair of headphones. Now in > order to > >> > save on space and so forth, I have a usb KVM switch. servicing > both > >> > computers. THis KVM only handles a keyboard and mouse, but you > could > >> > connect video, which I do not. So, when I have the Mac and PC > laptop > >> > connected and running, everything is fine. If I shut the laptop > lid/ > >> > put it to sleep, but leave it connected, I get this humming noise > >> that > >> > is not 60Mhz, but probably almost twice that. I can disconnect > the > >> > laptop and then soud goes away or if I adjust the mixer controls > >> just > >> > so, I can cancel out the sound. For some reason it sometimes gets > >> > messed up and that usually is because I have made a slight > >> adjustment > >> > to something and then I have to start all over again isulating > the > >> > sound by tweaking things. So, has anyone have any thoughts on > how I > >> > might correct this problem, so I do not have to keeep messing > with > >> the > >> > controls? It could be the mixer, but I suspect there is an issue > >> with > >> > both machines being connected to the KVM and this is a pretty > cheap > >> > KVM. The KVM is not near the computers, it is under my desk. > >> > > >> > Thanks, > >> > > >> > > >> > > >> > ------------------------------------ > >> > > >> > Send any questions regarding list management to: > >> > [email protected] > >> > To listen to the show archives go to link > >> > http://www.acbradio.org/pweb/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=33&MMN_position=47:29 > >> > Or > >> > ftp://ftp.acbradio.org/acbradio-archives/handyman/ > >> > > >> > The Pod Cast address for the Blind Handy Man Show is. > >> > http://www.acbradio.org/news/xml/podcast.php?pgm=saturday > >> > > >> > Visit The Blind Handy Man Files Page To Review Contributions From > >> Various > >> > List Members At The Following address: > >> > http://www.jaws-users.com/JAWS/handyman/ > >> > > >> > Visit the archives page at the following address > >> > http://www.mail-archive.com/[email protected]/ > >> > > >> > If you would like to join the JAWS Users List, then visit the > >> following > >> > address for more information: > >> > http://www.jaws-users.com/ > >> > For a complete list of email commands pertaining to the Blind > >> Handy Man > >> > list just send a blank message to: > >> > [email protected]! Groups Links > >> > > >> > > >> > > >> > > >> > > >> > >> > > > > > > > > [Non-text portions of this message have been removed] > > > > > > > > ------------------------------------ > > > > Send any questions regarding list management to: > > [email protected] > > To listen to the show archives go to link > > http://www.acbradio.org/pweb/index.php?module=pagemaster&PAGE_user_op=view_page&PAGE_id=33&MMN_position=47:29 > > Or > > ftp://ftp.acbradio.org/acbradio-archives/handyman/ > > > > The Pod Cast address for the Blind Handy Man Show is. > > http://www.acbradio.org/news/xml/podcast.php?pgm=saturday > > > > Visit The Blind Handy Man Files Page To Review Contributions From > Various > > List Members At The Following address: > > http://www.jaws-users.com/JAWS/handyman/ > > > > Visit the archives page at the following address > > http://www.mail-archive.com/[email protected]/ > > > > If you would like to join the JAWS Users List, then visit the > following > > address for more information: > > http://www.jaws-users.com/ > > For a complete list of email commands pertaining to the Blind > Handy Man > > list just send a blank message to: > > [email protected]! Groups Links > > > > > > > > > > [Non-text portions of this message have been removed]
