From Brian Willoughby Sent Thu, Dec 27th 2018, 02:44
From Brian Willoughby Sent Thu, Dec 27th 2018, 02:44
I design with the CUI Inc. SDS-50J, which, upon further consideration, = wouldn=E2=80=99t be good for a DIY MIDI patch panel because they=E2=80=99r= e PCB Mount, not panel mount. I suppose that if you =E2=80=9Cwanted=E2=80=9D= to design a PCB for this and solder everything, it might be workable, = but that seems unlikely unless you want captured cables inside the rack = that cannot be unplugged on the panel side. On Dec 26, 2018, at 6:35 PM, Michael E Caloroso = <xxx.xxxxxxxxxxx@xxxxx.xxx> wrote: > I was not happy with MMA approving 1/8" interconnects at all either. > Then I uncover my grounding error and can only imagine the headaches > introduced by 1/8" interconnects. >=20 > 1/8" interconnects rank up with RCA as the worse interconnects every > made and are banned from my system. Yes there are piles of modular > using 1/8" interconnect. They'll work today, not likely in the > future. >=20 > I usually buy parts from Mouser/Digikey. When my Mac computer comes > back from the repair shop, I'll retrieve OEM/PN from the soft copy > receipts that are stored on that machine. >=20 > MC >=20 > On 12/26/18, Brian Willoughby <xxxxxx@xxxxxxxxxxxx.xxx> wrote: >> Wow! >>=20 >> I=E2=80=99m very disappointed that the MMA approved 1/8=E2=80=9D TRS = jacks for MIDI on small >> devices, for the very reason that it=E2=80=99s common to connect the = Sleeve of a >> jack to the metal of an enclosure or modular face plate. Granted, = some >> people have pointed out that it=E2=80=99s possible to carefully = select 1/8=E2=80=9D TRS >> jacks where this grounding is prevented and/or to manually install >> insulating grommets and nuts, but that sounds like a headache waiting = to >> happen. >>=20 >> For my MIDI builds, I use jacks that are plastic, and which screw to = the >> enclosure or face plate without any possibility for ground = connections. What >> manufacturer and part number have you been using for MIDI jacks? = I=E2=80=99d always >> assumed that it=E2=80=99s easier to find non-grounded DIN-3 jacks. >>=20 >> Brian Willoughby >>=20 >>=20 >> On Dec 26, 2018, at 6:04 PM, Michael E Caloroso = <xxx.xxxxxxxxxxx@xxxxx.xxx> >> wrote: >>> While we're discussing studio MIDI wiring... >>>=20 >>> ...I build my own I/O panels for my racks, and my own MIDI cables. = I >>> recently uncovered a nasty bug that has perplexed me for years: >>>=20 >>> If you use metal shell MIDI plugs on your DIY MIDI cables, DO NOT >>> ALLOW MIDI GROUND TO COME IN CONTACT WITH THE SHELL. >>>=20 >>> I was gigging my road system and was experiencing intermittent MIDI >>> errors. After finally being able to reproduce it at home, I figured >>> out that the metal shell of the MIDI plug shorted to earth ground = via >>> the metal DIN jacks I was using on my DIY I/O panels. Stray shield >>> wires from the cable had contacted the cable clamp of the plug >>> (despite my best attempts at trimming the stray wires), completing = the >>> short circuit of MIDI ground to earth ground. MIDI gets very upset >>> under this condition. >>>=20 >>> I use an EBTech cable tested after I build all my DIY cables, and it >>> does not have the capacity to detect a short from the shell to any = of >>> the pins - it's not supposed to. Even with my diligent testing = after >>> completing a cable, this bug had eluded me for YEARS in my studio >>> system. Yes I was well aware that the MIDI specification grounding >>> system is designed that way FOR A REASON. >>>=20 >>> The only way to guarantee complete isolation of MIDI ground from = earth >>> on the metal shell of the plug was to disassemble the plug and add >>> shrink tubing over the trimmed end of the cable. This separates any >>> stray shield wires from the metal clamp of the plug. Once I fixed = my >>> cabling for the stage rig, it behaved MUCH better. >>>=20 >>> Nasty bug, this. >>>=20 >>> For years I had wondered why my SYSEX dumps were never 100% = reliable, >>> now I know why. >>>=20 >>> That's just the STAGE rig. Now I have to make the cable corrections >>> to my STUDIO system, which has easily over 30 DIY cables that I = built. >>> Guess how I am spending my holiday break... >>>=20 >>> Sent from my iGroundingCanBiteYou, >>> MC >>=20 >=20