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2018-06-11 by Diego Ragnini
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
2018-06-12 by yahoo@doepfer.de
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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] > Gesendet: Montag, 11. Juni 2018 15:09 > An: Doepfer_a100@yahoogroups.com > 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
2018-06-12 by Florian Anwander
Am 11.06.2018 um 15:09 schrieb Diego Ragnini diegora@free.fr [Doepfer_a100]: > 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. Hi Diego, As Dieter mentioned, it is quite unlikely to get a crosstalk from the mixer. I think we need a high resolution picture of the complete patch to check where the crosstalk might come from. Florian -- http://www.florian-anwander.de
2018-06-12 by John Hollis
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, yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] > > Gesendet: Montag, 11. Juni 2018 15:09 > > An: Doepfer_a100@yahoogroups.com > > 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 > > >
2018-06-12 by Diego Ragnini
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 john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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, yahoo@doepfer.de <mailto:yahoo@doepfer.de> [Doepfer_a100] <Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>> 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: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> [mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>] > > > Gesendet: Montag, 11. Juni 2018 15:09 > > > An: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > > > 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 > > > > > > > > >
2018-06-12 by John Hollis
Hi Diego, It looks like the modules are mounted directly on wood without an earthing plane. If that’s the case it might well cause problems. Best John
> On 12 Jun 2018, at 13:06, Diego Ragnini diegora@free.fr [Doepfer_a100] <Doepfer_a100@yahoogroups.com> wrote: > > 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 > > > <Patch.png> > >> Il giorno 12 giu 2018, alle ore 10:25, John Hollis john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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, yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] >> > > Gesendet: Montag, 11. Juni 2018 15:09 >> > > An: Doepfer_a100@yahoogroups.com >> > > 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 >> > >> > >> > >> >> > > >
2018-06-12 by Florian Anwander
Tobe honest: the culprit is not in the pictured case: it is the device that you describe with "Mixer" where the A-138s and the WMD multiple are fed to. What is this "Mixer"? Am 12.06.2018 um 14:06 schrieb Diego Ragnini diegora@free.fr [Doepfer_a100]: > > > 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 > john@hollis.co.uk <mailto:john@hollis.co.uk> [Doepfer_a100] > <Doepfer_a100@yahoogroups.com > <mailto:Doepfer_a100@yahoogroups.com>> 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,yahoo@doepfer.de > <mailto:yahoo@doepfer.de>[Doepfer_a100] > <Doepfer_a100@yahoogroups.com > <mailto:Doepfer_a100@yahoogroups.com>> 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:Doepfer_a100@yahoogroups.com > <mailto:Doepfer_a100@yahoogroups.com>[mailto:Doepfer_a100@yahoogroups.com > <mailto:%0A%20Doepfer_a100@yahoogroups.com>] > > > Gesendet: Montag, 11. Juni 2018 15:09 > > > An:Doepfer_a100@yahoogroups.com > <mailto:Doepfer_a100@yahoogroups.com> > > > 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 ca n 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 > > > > > > > > > > > -- http://www.florian-anwander.de
2018-06-12 by yahoo@doepfer.de
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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] > Gesendet: Dienstag, 12. Juni 2018 14:06 > An: Doepfer_a100@yahoogroups.com > 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 > john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> > 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, yahoo@doepfer.de [Doepfer_a100] > <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com]
> > Gesendet: Montag, 11. Juni 2018 15:09 > > An: Doepfer_a100@yahoogroups.com > > 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 > > >
2018-06-12 by Diego Ragnini
“Mixer” is not a module, is an outboard mixer, a Soundcraft GB2R 12-2 where all audio signals are routed to. It’s from its monitor outs (headphones) that I detected the leak. It makes no sense to me.
> Il giorno 12 giu 2018, alle ore 14:42, Florian Anwander fanwander@mnet-online.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> ha scritto: > > Tobe honest: the culprit is not in the pictured case: it is the device > that you describe with "Mixer" where the A-138s and the WMD multiple are > fed to. What is this "Mixer"? > > Am 12.06.2018 um 14:06 schrieb Diego Ragnini diegora@free.fr <mailto:diegora@free.fr> [Doepfer_a100]: > > > > > > 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 > > john@hollis.co.uk <mailto:john@hollis.co.uk> <mailto:john@hollis.co.uk <mailto:john@hollis.co.uk>> [Doepfer_a100] > > <Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > > <mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>>> 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,yahoo@doepfer.de <mailto:yahoo@doepfer.de> > > <mailto:yahoo@doepfer.de <mailto:yahoo@doepfer.de>>[Doepfer_a100] > > <Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > > <mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>>> 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:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > > <mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>>[mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > > <mailto:%0A%20Doepfer_a100@yahoogroups.com <mailto:20Doepfer_a100@yahoogroups.com>>] > > > > Gesendet: Montag, 11. Juni 2018 15:09 > > > > An:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > > <mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>> > > > > 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 ca n 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 > > > > > > > > > > > > > > > > > > > > > -- > http://www.florian-anwander.de <http://www.florian-anwander.de/> > >
2018-06-12 by Florian Anwander
Hello Diego Am 12.06.2018 um 15:01 schrieb Diego Ragnini diegora@free.fr [Doepfer_a100]: > > > “Mixer” is not a module, is an outboard mixer, a Soundcraft GB2R 12-2 > where all audio signals are routed to. > It’s from its monitor outs (headphones) that I detected the leak. > It makes no sense to me. Where from do you know that the leak is not in the external mixer? The same is valid for the input signals Audio1 and Audio2. They might might leak into each other before the rack The only proof that there is a leaking caused by the A.138 or the WMD would be to remove all external connections and then feed an internal signal into the WMD and listen to the unused A-138. After that the other way around: feed an internal signal into the Mixer and listen to the (unused) WMD. Everything else will be related to external gear or to the interconnection with the external gear. Florian
2018-06-12 by Diego Ragnini
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, yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] >> Gesendet: Dienstag, 12. Juni 2018 14:06 >> An: Doepfer_a100@yahoogroups.com >> 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 >> john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> >> 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, yahoo@doepfer.de [Doepfer_a100] >> <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com > [mailto:Doepfer_a100@yahoogroups.com] >>> Gesendet: Montag, 11. Juni 2018 15:09 >>> An: Doepfer_a100@yahoogroups.com >>> 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 > > >
2018-06-12 by Diego Ragnini
Florian thanks again for the help, as far as I can see there’s no pre-post “point” where the leak might occur. Each signal goes straight to its target and nowhere else. Audio 1 multed signal and A-138s mixer outs have separated channels (1 mono, 1 stereo) on the outboard mixer, so I had muted the stereo channel and assured that no pre-sends were active on that channel: the A-138s channel 1 signal (DPO) was audible through the mono channel dedicated to the multed signal (softpop) which had to be recorded.
> Il giorno 12 giu 2018, alle ore 15:13, Florian Anwander fanwander@mnet-online.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> ha scritto: > > Hello Diego > > Am 12.06.2018 um 15:01 schrieb Diego Ragnini diegora@free.fr [Doepfer_a100]: > > > > > > “Mixer” is not a module, is an outboard mixer, a Soundcraft GB2R 12-2 > > where all audio signals are routed to. > > It’s from its monitor outs (headphones) that I detected the leak. > > It makes no sense to me. > Where from do you know that the leak is not in the external mixer? > > The same is valid for the input signals Audio1 and Audio2. They might > might leak into each other before the rack > > The only proof that there is a leaking caused by the A.138 or the WMD > would be to remove all external connections and then feed an internal > signal into the WMD and listen to the unused A-138. After that the other > way around: feed an internal signal into the Mixer and listen to the > (unused) WMD. > > Everything else will be related to external gear or to the > interconnection with the external gear. > > Florian >
2018-06-12 by Analog Monster
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 diegora@free.fr [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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, yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups..com] > >> Gesendet: Dienstag, 12. Juni 2018 14:06 > >> An: Doepfer_a100@yahoogroups.com > >> 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 > >> john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> > >> 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, yahoo@doepfer.de [Doepfer_a100] > >> <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com > > [mailto:Doepfer_a100@yahoogroups.com] > >>> Gesendet: Montag, 11. Juni 2018 15:09 > >>> An: Doepfer_a100@yahoogroups.com > >>> 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 > > > > > > > >
2018-06-12 by yahoo@doepfer.de
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 diegora@free.fr > [Doepfer_a100] <Doepfer_a100@yahoogroups..com> 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, yahoo@doepfer.de > [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com > [mailto:Doepfer_a100@yahoogroups..com] > >> Gesendet: Dienstag, 12. Juni 2018 14:06 > >> An: Doepfer_a100@yahoogroups.com > >> 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 > >> john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> > >> 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, yahoo@doepfer.de [Doepfer_a100] > >> <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com > > [mailto:Doepfer_a100@yahoogroups.com] > >>> Gesendet: Montag, 11. Juni 2018 15:09 > >>> An: Doepfer_a100@yahoogroups.com > >>> 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 > > > > > > > > > > > >
2018-06-12 by Diego Ragnini
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, yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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 diegora@free.fr >> [Doepfer_a100] <Doepfer_a100@yahoogroups..com> 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, yahoo@doepfer.de >> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >> [mailto:Doepfer_a100@yahoogroups..com] >>>> Gesendet: Dienstag, 12. Juni 2018 14:06 >>>> An: Doepfer_a100@yahoogroups.com >>>> 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 >>>> john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> >>>> 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, yahoo@doepfer.de [Doepfer_a100] >>>> <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >>> [mailto:Doepfer_a100@yahoogroups.com] >>>>> Gesendet: Montag, 11. Juni 2018 15:09 >>>>> An: Doepfer_a100@yahoogroups.com >>>>> 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 > > >
2018-06-13 by yahoo@doepfer.de
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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] > Gesendet: Dienstag, 12. Juni 2018 19:43 > An: Doepfer_a100@yahoogroups.com > 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, yahoo@doepfer.de > [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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 diegora@free.fr > >> [Doepfer_a100] <Doepfer_a100@yahoogroups..com> 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, yahoo@doepfer.de > >> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com > >> [mailto:Doepfer_a100@yahoogroups..com] > >>>> Gesendet: Dienstag, 12. Juni 2018 14:06 > >>>> An: Doepfer_a100@yahoogroups.com > >>>> 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 > >>>> john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> > >>>> 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, yahoo@doepfer.de [Doepfer_a100] > >>>> <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com > >>> [mailto:Doepfer_a100@yahoogroups.com] > >>>>> Gesendet: Montag, 11. Juni 2018 15:09 > >>>>> An: Doepfer_a100@yahoogroups.com > >>>>> 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 <diegora@free.fr> > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > >
2018-06-14 by Diego Ragnini
Thanks a lot Dieter, I mentioned the LC6 for mistake in the object line, it simply is the LC3. I doubt that the problem source is the A-138s mixer, though its signal can be heard on the multed outs of the WMD buffered multiple. As soon as I come back in town, the first trial will be simply displacing the WMD multiple onto another (grounded!) case where one of the 2 audio sources comes from (an A100P9 which I assume is grounded). Then I will try the experiment you suggest, though I never managed things like this and I just know what is grounding theoretically… I have to specify that all instruments (except monitors and stereo amplifier) are supplied via an APC unit throughout various multiple sockets bays (instruments are connected to the multiple bays and the bays are connected to the APC unit. Other hardware included in the patch is: A-100P9 PSU3 (DPO installed onto it) and SOFTPOP If I properly understand, the A-100P9 should be grounded yet; as for the latter, it is not clear to me if grounded or not. Reading the manual I deduce that “yes” it is grounded, though it is not clear to me what GND means when the unit works on battery (as it can be used with 1,5V batteries as well). The manual section dedicated to the patchbay talks about grounding: I power the unit with a universal PSU and I assume that it can assure grounding, as the SoftPop comes without any PSU… (the polarity demanded is NEG outside). So, if the universal PSU assures grounding then I probably can use this R socket to connect temporarily the LC3 case’s ground… (?) Best wishes, Diego
> Il giorno 13 giu 2018, alle ore 09:53, yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> [mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>] >> Gesendet: Dienstag, 12. Juni 2018 19:43 >> An: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> >> 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, yahoo@doepfer.de >> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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 diegora@free.fr >>>> [Doepfer_a100] <Doepfer_a100@yahoogroups..com> 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, yahoo@doepfer.de >>>> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >>>> [mailto:Doepfer_a100@yahoogroups..com] >>>>>> Gesendet: Dienstag, 12. Juni 2018 14:06 >>>>>> An: Doepfer_a100@yahoogroups.com >>>>>> 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 >>>>>> john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> >>>>>> 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, yahoo@doepfer.de [Doepfer_a100] >>>>>> <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >>>>> [mailto:Doepfer_a100@yahoogroups.com] >>>>>>> Gesendet: Montag, 11. Juni 2018 15:09 >>>>>>> An: Doepfer_a100@yahoogroups.com >>>>>>> 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 <diegora@free.fr> >> ------------------------------------ >> >> >> ------------------------------------ >> >> Yahoo Groups Links >> >> >> > > > > ------------------------------------ > > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > >
2018-06-20 by Diego Ragnini
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, yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] >> Gesendet: Dienstag, 12. Juni 2018 19:43 >> An: Doepfer_a100@yahoogroups.com >> 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, yahoo@doepfer.de >> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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 diegora@free.fr >>>> [Doepfer_a100] <Doepfer_a100@yahoogroups..com> 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, yahoo@doepfer.de >>>> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >>>> [mailto:Doepfer_a100@yahoogroups..com] >>>>>> Gesendet: Dienstag, 12. Juni 2018 14:06 >>>>>> An: Doepfer_a100@yahoogroups.com >>>>>> 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 >>>>>> john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> >>>>>> 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, yahoo@doepfer.de [Doepfer_a100] >>>>>> <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >>>>> [mailto:Doepfer_a100@yahoogroups.com] >>>>>>> Gesendet: Montag, 11. Juni 2018 15:09 >>>>>>> An: Doepfer_a100@yahoogroups.com >>>>>>> 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 <diegora@free.fr> >> ------------------------------------ >> >> >> ------------------------------------ >> >> Yahoo Groups Links >> >> >> > > > > ------------------------------------ > > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > >
2018-06-20 by yahoo@doepfer.de
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, yahoo@doepfer.de > [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] > Gesendet: Dienstag, 12. Juni 2018 19:43 > An: Doepfer_a100@yahoogroups.com > 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, yahoo@doepfer.de > > [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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 diegora@free.fr > [Doepfer_a100] <Doepfer_a100@yahoogroups..com> 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, yahoo@doepfer.de > > [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com > > [mailto:Doepfer_a100@yahoogroups..com] > > Gesendet: Dienstag, 12. Juni 2018 14:06 > An: Doepfer_a100@yahoogroups.com > 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 > john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> > 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, yahoo@doepfer.de [Doepfer_a100] > > <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com > > [mailto:Doepfer_a100@yahoogroups.com] > > Gesendet: Montag, 11. Juni 2018 15:09 > An: Doepfer_a100@yahoogroups.com > 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 <diegora@free.fr> > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > > > > > > > ------------------------------------ > > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > > > > > > > > >
2018-06-20 by Diego Ragnini
Thank you, my knowledge on electricity and powering is so close to zero that I had to post an obvious question I will come back if interesting results will arise Best wishes
> Il giorno 20 giu 2018, alle ore 09:58, yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> ha scritto: > > 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, yahoo@doepfer.de >> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] >> Gesendet: Dienstag, 12. Juni 2018 19:43 >> An: Doepfer_a100@yahoogroups.com >> 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, yahoo@doepfer.de >> >> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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 diegora@free.fr >> [Doepfer_a100] <Doepfer_a100@yahoogroups..com> 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, yahoo@doepfer.de >> >> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >> >> [mailto:Doepfer_a100@yahoogroups..com] >> >> Gesendet: Dienstag, 12. Juni 2018 14:06 >> An: Doepfer_a100@yahoogroups.com >> 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 >> john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> >> 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, yahoo@doepfer.de [Doepfer_a100] >> >> <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >> >> [mailto:Doepfer_a100@yahoogroups.com] >> >> Gesendet: Montag, 11. Juni 2018 15:09 >> An: Doepfer_a100@yahoogroups.com >> 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 <diegora@free.fr> >> ------------------------------------ >> >> >> ------------------------------------ >> >> Yahoo Groups Links >> >> >> >> >> >> >> >> ------------------------------------ >> >> ------------------------------------ >> >> >> ------------------------------------ >> >> Yahoo Groups Links >> >> >> >> >> >> >> >> >> >> > > > > ------------------------------------ > > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > >
2018-06-28 by Diego Ragnini
Hello, regarding the floating GND matter, has the Ribbon R2M control box a floating ground as well? In other terms, do I have to connect the black box metal frame to the ground/earth? Best, Diego
> Il giorno 20 giu 2018, alle ore 09:58, yahoo@doepfer.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> ha scritto: > > 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, yahoo@doepfer.de >> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] >> Gesendet: Dienstag, 12. Juni 2018 19:43 >> An: Doepfer_a100@yahoogroups.com >> 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, yahoo@doepfer.de >> >> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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 diegora@free.fr >> [Doepfer_a100] <Doepfer_a100@yahoogroups..com> 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, yahoo@doepfer.de >> >> [Doepfer_a100] <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >> >> [mailto:Doepfer_a100@yahoogroups..com] >> >> Gesendet: Dienstag, 12. Juni 2018 14:06 >> An: Doepfer_a100@yahoogroups.com >> 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 >> john@hollis.co.uk [Doepfer_a100] <Doepfer_a100@yahoogroups.com> >> 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, yahoo@doepfer.de [Doepfer_a100] >> >> <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >> >> [mailto:Doepfer_a100@yahoogroups.com] >> >> Gesendet: Montag, 11. Juni 2018 15:09 >> An: Doepfer_a100@yahoogroups.com >> 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 <diegora@free.fr> >> ------------------------------------ >> >> >> ------------------------------------ >> >> Yahoo Groups Links >> >> >> >> >> >> >> >> ------------------------------------ >> >> ------------------------------------ >> >> >> ------------------------------------ >> >> Yahoo Groups Links >> >> >> >> >> >> >> >> >> >> > > > > ------------------------------------ > > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > >
2018-06-28 by Florian Anwander
No, you should not. But you have to reassure, that the ground connection is provided by the 3.5mm cables between the R2M control box and the A-100. Do NOT(!) use 3.5mm cables with stereo sockets!!!
On 28.06.18 18:58 , Diego Ragnini diegora@free.fr [Doepfer_a100] wrote: > Hello, > regarding the floating GND matter, has the Ribbon R2M control box a floating ground as well? In other terms, do I have to connect the black box metal frame to the ground/earth? > > Best, Diego > >> Il giorno 20 giu 2018, alle ore 09:58, yahoo@doepfer.de [Doepfer_a100]<Doepfer_a100@yahoogroups.com> ha scritto: >> >> 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, yahoo@doepfer.de >>> [Doepfer_a100]<Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com [mailto:Doepfer_a100@yahoogroups.com] >>> Gesendet: Dienstag, 12. Juni 2018 19:43 >>> An: Doepfer_a100@yahoogroups.com >>> 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, yahoo@doepfer.de >>> >>> [Doepfer_a100]<Doepfer_a100@yahoogroups.com> 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 diegora@free.fr >>> [Doepfer_a100]<Doepfer_a100@yahoogroups..com> 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, yahoo@doepfer.de >>> >>> [Doepfer_a100]<Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >>> >>> [mailto:Doepfer_a100@yahoogroups..com] >>> >>> Gesendet: Dienstag, 12. Juni 2018 14:06 >>> An: Doepfer_a100@yahoogroups.com >>> 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 >>> john@hollis.co.uk [Doepfer_a100]<Doepfer_a100@yahoogroups.com> >>> 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, yahoo@doepfer.de [Doepfer_a100] >>> >>> <Doepfer_a100@yahoogroups.com> 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: Doepfer_a100@yahoogroups.com >>> >>> [mailto:Doepfer_a100@yahoogroups.com] >>> >>> Gesendet: Montag, 11. Juni 2018 15:09 >>> An: Doepfer_a100@yahoogroups.com >>> 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<diegora@free.fr> >>> ------------------------------------ >>> >>> >>> ------------------------------------ >>> >>> Yahoo Groups Links >>> >>> >>> >>> >>> >>> >>> >>> ------------------------------------ >>> >>> ------------------------------------ >>> >>> >>> ------------------------------------ >>> >>> Yahoo Groups Links >>> >>> >>> >>> >>> >>> >>> >>> >>> >>> >> >> >> ------------------------------------ >> >> ------------------------------------ >> >> >> ------------------------------------ >> >> Yahoo Groups Links >> >> >> > > > ------------------------------------ > Posted by: Diego Ragnini<diegora@free.fr> > ------------------------------------ > > > ------------------------------------ > > Yahoo Groups Links > > >
2018-06-29 by Diego Ragnini
Thank you Florian, as usual very available and helpful So, if I use brand new mono Doepfer cables and the R2M black box is connected via these cables to A-100 systems which are properly grounded then everything should be fine, right? What happens if one provides an external wire to connect the black box to the ground/earth (not too differently from what I will do for the A-100LC3 cases)? Does the ground uses the “tip” of the cable? The MS20 also shows a 1/4 female jack labelled “GND": how do I use this? And is it always the tip providing the connection? Best, Diego
> Il giorno 28 giu 2018, alle ore 23:33, Florian Anwander fanwander@mnet-online.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> ha scritto: > > No, you should not. But you have to reassure, that the ground connection > is provided by the 3.5mm cables between the R2M control box and the > A-100. Do NOT(!) use 3.5mm cables with stereo sockets!!! > > On 28.06.18 18:58 , Diego Ragnini diegora@free.fr <mailto:diegora@free.fr> [Doepfer_a100] wrote: > > Hello, > > regarding the floating GND matter, has the Ribbon R2M control box a floating ground as well? In other terms, do I have to connect the black box metal frame to the ground/earth? > > > > Best, Diego > > > >> Il giorno 20 giu 2018, alle ore 09:58, yahoo@doepfer.de <mailto:yahoo@doepfer.de> [Doepfer_a100]<Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>> ha scritto: > >> > >> 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, yahoo@doepfer.de <mailto:yahoo@doepfer.de> > >>> [Doepfer_a100]<Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>> 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: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> [mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>] > >>> Gesendet: Dienstag, 12. Juni 2018 19:43 > >>> An: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > >>> 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, yahoo@doepfer.de <mailto:yahoo@doepfer.de> > >>> > >>> [Doepfer_a100]<Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>> 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 diegora@free.fr <mailto:diegora@free.fr> > >>> [Doepfer_a100]<Doepfer_a100@yahoogroups..com> 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, yahoo@doepfer.de <mailto:yahoo@doepfer.de> > >>> > >>> [Doepfer_a100]<Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>> 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: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > >>> > >>> [mailto:Doepfer_a100@yahoogroups..com] > >>> > >>> Gesendet: Dienstag, 12. Juni 2018 14:06 > >>> An: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > >>> 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 > >>> john@hollis.co.uk <mailto:john@hollis.co.uk> [Doepfer_a100]<Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>> > >>> 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, yahoo@doepfer.de <mailto:yahoo@doepfer.de> [Doepfer_a100] > >>> > >>> <Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>> 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: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > >>> > >>> [mailto:Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com>] > >>> > >>> Gesendet: Montag, 11. Juni 2018 15:09 > >>> An: Doepfer_a100@yahoogroups.com <mailto:Doepfer_a100@yahoogroups.com> > >>> 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<diegora@free.fr <mailto:diegora@free.fr>> > >>> ------------------------------------ > >>> > >>> > >>> ------------------------------------ > >>> > >>> Yahoo Groups Links > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> ------------------------------------ > >>> > >>> ------------------------------------ > >>> > >>> > >>> ------------------------------------ > >>> > >>> Yahoo Groups Links > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >>> > >> > >> > >> ------------------------------------ > >> > >> ------------------------------------ > >> > >> > >> ------------------------------------ > >> > >> Yahoo Groups Links > >> > >> > >> > > > > > > ------------------------------------ > > Posted by: Diego Ragnini<diegora@free.fr <mailto:diegora@free.fr>> > > ------------------------------------ > > > > > > ------------------------------------ > > > > Yahoo Groups Links > > > > > > > > >
2018-06-29 by Florian Anwander
Hi Diego Am 29.06.2018 um 07:43 schrieb Diego Ragnini diegora@free.fr [Doepfer_a100]: > > So, if I use brand new mono Doepfer cables and the R2M black box is > connected via these cables to A-100 systems which are properly > grounded then everything should be fine, right? > Yes. > What happens if one provides an external wire to connect the black box > to the ground/earth (not too differently from what I will do for the > A-100LC3 cases)? I cannot judge at the moment, whether the housing is connected to the signal ground. Basically there is no need for that, as there is no connection between the (signal- and housing-) ground and the earth/ground of your wall outlets. There is no need for because the R2M uses a wall wart. There is no hi voltage inside the device. > Does the ground uses the “tip” of the cable? It does not use the tip, but either the "shaft" or the "ring". In fact: It is defined as to use the shaft, but it assumes the shaft of a mono jack, which reaches up to the "ring" position of the stereo jack. Some Doepfer modules are equipped with Cliff sockets. Those sockets have there shaft-contact at the position, where a stereo-jack has its "ring". There is nothing wrong with it, as it relies on using mono-cables. > > The MS20 also shows a 1/4 female jack labelled “GND": how do I use > this? And is it always the tip providing the connection? This is a big misunderstanding opf the MS-20. This symbol means, that the socket will switch the tip to ground, when the corresponding function is active. Example: https://www.muziker.de/image/2/0039/9lan.ms20mini_detail4_jpg.jpg In the low right corner is a socket which is connected to the push button aside the keyboard. The "GND"-symbol means: "The tip of a cable that is plugged in here will be shortcut to ground, as soon as you press the button". This is the function of a so called switched trigger. (connect this socket with the MS-20s trigger-in-socket and you will be able to trigger a note). Florian http://www.florian-anwander.de
2018-06-29 by Florian Anwander
Am 29.06.2018 um 09:48 schrieb Florian Anwander fanwander@mnet-online.de [Doepfer_a100]: > Those sockets have there shaft-contact at the 's/there/their/'
2018-06-29 by Diego Ragnini
Florian, thanks a lot, I will try to analyse and to use your indications one by one You surely are more useful than an encyclopaedia ! :-)) Cheers
> Il giorno 29 giu 2018, alle ore 09:48, Florian Anwander fanwander@mnet-online.de [Doepfer_a100] <Doepfer_a100@yahoogroups.com> ha scritto: > > Hi Diego > > Am 29.06.2018 um 07:43 schrieb Diego Ragnini diegora@free.fr <mailto:diegora@free.fr> [Doepfer_a100]: > > > > So, if I use brand new mono Doepfer cables and the R2M black box is > > connected via these cables to A-100 systems which are properly > > grounded then everything should be fine, right? > > > Yes. > > > What happens if one provides an external wire to connect the black box > > to the ground/earth (not too differently from what I will do for the > > A-100LC3 cases)? > I cannot judge at the moment, whether the housing is connected to the > signal ground. Basically there is no need for that, as there is no > connection between the (signal- and housing-) ground and the > earth/ground of your wall outlets. There is no need for because the R2M > uses a wall wart. There is no hi voltage inside the device. > > > Does the ground uses the “tip” of the cable? > It does not use the tip, but either the "shaft" or the "ring". In fact: > It is defined as to use the shaft, but it assumes the shaft of a mono > jack, which reaches up to the "ring" position of the stereo jack. Some > Doepfer modules are equipped with Cliff sockets. Those sockets have > there shaft-contact at the position, where a stereo-jack has its "ring". > There is nothing wrong with it, as it relies on using mono-cables. > > > > > The MS20 also shows a 1/4 female jack labelled “GND": how do I use > > this? And is it always the tip providing the connection? > This is a big misunderstanding opf the MS-20. This symbol means, that > the socket will switch the tip to ground, when the corresponding > function is active. > Example: https://www.muziker.de/image/2/0039/9lan.ms20mini_detail4_jpg.jpg <https://www.muziker.de/image/2/0039/9lan.ms20mini_detail4_jpg.jpg> > In the low right corner is a socket which is connected to the push > button aside the keyboard. The "GND"-symbol means: "The tip of a cable > that is plugged in here will be shortcut to ground, as soon as you press > the button". This is the function of a so called switched trigger. > (connect this socket with the MS-20s trigger-in-socket and you will be > able to trigger a note). > > Florian > > http://www.florian-anwander.de <http://www.florian-anwander.de/> > >