From yahoo Sent Wed, Jun 20th 2018, 07:59
Yes, these are the correct terminals. If the GND connection really solves the problems one has to think about a permanent solution. But I have never heard about similar problems from other customers. And we use A-100P9 together with A-100LC3 during exhibitions or work shops and never had any problems. Best wishes Dieter Doepfer > Please can someone check that this would be the right connection > in order to grant that the A-100LC3 “GND” is temporarily > connected to mains earth/GND? So I would temporarily connect the > blade terminal of the first picture to the same blade terminal > found in the A-100P9 (2nd picture).. Then, in order to set a > definitive connection, I would provide a mains “plug" where to > pass uniquely cables for all floating GND's in the system towards > the mains earth/GND pin wall socket. Would both these solutions > be correct, please? > Best, Diego > > > > > > > > > > > Il giorno 13 giu 2018, alle ore 09:53, xxxxx@xxxxxxx.xx > [Doepfer_a100] <xxxxxxx_xxxx@xxxxxxxxxxx.xxx> ha scritto: > > > It's not for sure that this is the reason for your problems. So I'd > recommend just to try it out, i.e. connect the GND of the A-100LC3 > temporarily (e.g. the GND blade terminal on the A-100 bus board) to GND of > the other devices included in the signal path. If you use an A-100LC6 > (mentioned in the subject of your message) that not necessary as the > A-100LC6 GND is connected to mains earth/GND. > > Does the problem also occur if you use the A-138s outputs > directly (without > the buffered multiple)? > > Best wishes > Dieter Doepfer > > > -----Ursprüngliche Nachricht----- > Von: xxxxxxx_xxxx@xxxxxxxxxxx.xxx [mailto:xxxxxxx_xxxx@xxxxxxxxxxx.xxx] > Gesendet: Dienstag, 12. Juni 2018 19:43 > An: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > Betreff: Re: [Doepfer_a100] Interferences from A-138s into LC6 > > > Ok thanks, so I have to learn how to ground it ! > It seems obvious but not > I will try > > Floating GND (?) needs to be deepened > Or I’d better search for someone who can do it? > > > > Il giorno 12 giu 2018, alle ore 15:57, xxxxx@xxxxxxx.xx > > [Doepfer_a100] <xxxxxxx_xxxx@xxxxxxxxxxx.xxx> ha scritto: > > > I fully agree. As the A-100LC3 also uses an external power > > supply it's GND > > is not connected to mains earth/GND and has the mentioned > > "floating GND" (in > > contrast to all other A-100 cases). > > Best wishes > Dieter Doepfer > > > Definitely get that case properly earthed first. Even if its not > causing this issue, its not safe for you or your equipment. There > should be a both crimped and soldered lug on the metal case, held > in good contact with a screw and washers which connects to earth.. > This probably can be done by connecting the PSU ground to the > case, but its worth checking that the case actually is > electrically connected to the ground pin on your wall socket. > Some PSUs with external bricks have a floating ground > > > On 12 Jun 2018, at 14:20, Diego Ragnini xxxxxxx@xxxx.xx > [Doepfer_a100] <xxxxxxx_xxxx@xxxxxxxxxxx..xxx> wrote: > > > > Thanks, the cables are all recent doepfer > Not sure to know how to do this experiment though I will try. > Which GND do you refer to? > Just the one of the audio 2 (the source which feeds the A138s) or > the multed audio 1 as well? > Audio 2 is from a DPO mounted on a A-100P9 PSU3 > Audio 1 is from a Bastl Instruments SoftPop, which in the > meanwhile went back to the dealer to be replaced for another kind > of issue. I had noticed some electricity at fingers while > touching the side panels of its case. It probably is not properly > grounded, though it shows some sockets for grounding... > > Best wishes, > Diego > > > Il giorno 12 giu 2018, alle ore 14:54, xxxxx@xxxxxxx.xx > > [Doepfer_a100] <xxxxxxx_xxxx@xxxxxxxxxxx.xxx> ha scritto: > > > As external audio signals are involved it maybe a grounding > > problem. Make > > sure that the cables that are used to connect the modules to > > the external > > signals carry GND (there are patch cables available without > > GND, as long as > > one patches within the case no problems occur, but with > > external signals the > > GND is missing). And I don't know if all WMD sockets are > > grounded. In some > > modules (yes, also in some older A-100 modules :-) the GND of > > some sockets > > is not connected as it does not matter if all modules are > > connected to the > > same GND. > You may try also the following: connect the GND of the A-100LC3 > > temporarily > > to the GND of the signal source unit (at the A-100LC3 there > > should be an > > unused GND terminal on the bus board). If then the problem > > disappears it's a > > grounding issue. > It's just an idea. Not sure if this is the reason. > > Best wishes > Dieter Doepfer > > > > -----Ursprüngliche Nachricht----- > Von: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > > [mailto:xxxxxxx_xxxx@xxxxxxxxxxx..xxx] > > Gesendet: Dienstag, 12. Juni 2018 14:06 > An: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > Betreff: Re: [Doepfer_a100] Interferences from A-138s into LC6 > > > > > Hi thanks everybody for replying > The situation was vague indeed, sorry, though the patch is very basic > The case is just 1 row (LC3) > As you can see by the colours on the following screenshot, the > multed audio 1 signal (red cable) is slightly affected by the > audio 2 signal (blue cable), as we turn CW the A-138s channel > > volume knob. > > > > Nothing else is patched/ engaged. > > > I unfortunately have no means nor expertise for measuring anything... > ASAP I will first try installing the multiple on another case. > > > Best, Diego > > > > > > > > Il giorno 12 giu 2018, alle ore 10:25, John Hollis > xxxx@xxxxxx.xx.xx [Doepfer_a100] <xxxxxxx_xxxx@xxxxxxxxxxx.xxx> > ha scritto: > > > Hi Diego, > > It does sound like there might be a short between the adjacent > modules. Can you check for that? > > Thanks > John > > > On 12 Jun 2018, at 08:57, xxxxx@xxxxxxx.xx [Doepfer_a100] > > <xxxxxxx_xxxx@xxxxxxxxxxx.xxx> wrote: > > > Hello, > > the A-138s is a very simple module (just a standard mixer > > circuit with > > operational amplifiers) and I have no idea how the signal could > > crosstalk to > > any other module. > > Best wishes > Dieter Doepfer > > > -----Ursprungliche Nachricht----- > Von: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > > [mailto:xxxxxxx_xxxx@xxxxxxxxxxx.xxx] > > Gesendet: Montag, 11. Juni 2018 15:09 > An: xxxxxxx_xxxx@xxxxxxxxxxx.xxx > Betreff: [Doepfer_a100] Interferences from A-138s into LC6 > > > Hello, I have a WMD buffered multiple which suffers from A-138s > mixer interferences, both powered by an LC6 Doepfer case. Is the > WMD faulty or its cable? A-138s output can be heard on the WMD, > unless knob's fully CCW. I also see that the multed signal is > louder that the original one. Any hint is welcome. > > Best regards, > Diego > > > > > > > > > > > > > > > > > > ------------------------------------ > > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > > > > > > > > > > > > > > ------------------------------------ > > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > > > > > > > ------------------------------------ > Posted by: Diego Ragnini <xxxxxxx@xxxx.xx> > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > > > > > > > ------------------------------------ > > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > > > > > > > > > ------------------------------------ ------------------------------------ ------------------------------------ Yahoo Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Doepfer_a100/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/Doepfer_a100/join (Yahoo! 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