Analogue systems

I'm no expert but it sounds like the cause of the crosstalk is lack of
proper isolation of the VCO's, the same phenomenon that can happen with
telephone wires in close proximity.  I'd guess that it's the VCOs' fault
rather than the ASys case, which merely provides power.

On 8/17/07, TacocaT <zpardos@yahoo.com> wrote:
>
>   Emailing Doepfer is an option but this is an Analogue Systems case.
> I'll send an email to ASys but I doubt the manufacturer's will reply
> with any new info. The crosstalk is faint enough I may just say it's
> part of the system's personality and maybe migrate the doepfer modules
> to a doepfer case when I accumulate enough. Other than this crosstalk
> issue, the modules seems to be working just fine in the case.
>
> I will also try installing one module at a time, starting with the two
> VCOs and see if they still exhibit this behavior.
>
> Thanks
>
> --- In analogue_systems@yahoogroups.com<analogue_systems%40yahoogroups.com>,
> Bakis Sirros
> <synth_freak_2000@...> wrote:
> >
> > yes, that is a good idea.
> > best regards,
> > Bakis.
> >
> >
> > --- Monroe Eskew <monroe.eskew@...> wrote:
> >
> > > I suggest emailing Doepfer. Please let us know what
> > > they say!
> > >
> > > On 8/16/07, ilanode <techmeier@...> wrote:
> > > >
> > > > --- In
> > >
> > analogue_systems@yahoogroups.com <analogue_systems%40yahoogroups.com>
> <analogue_systems%40yahoogroups.com>,
> > > > "Tom Remi Flygel"
> > > > <tom-rf@> wrote:
> > > > >
> > > > > But that's what crosstalk does as a term in
> > > electronics.
> > > >
> > > > Sure, I'm aware of this. Since a modular synth
> > > ought to be designed to
> > > > minimize cross talk, I don't think the prob. is
> > > the design itself.
> > > > Personally I never experienced this with my
> > > Doepfer VCOs nor ever
> > > > heared about similiar issues.
> > > >
> > > >
> > > > When two telephone cables with improper isolation
> > > are lying next to
> > > > eachother, the signal will "jump" over to the
> > > other cable. This is why
> > > > you could sometimes listen to other people's
> > > conversations when you
> > > > were having a phonecall. There doesn't have to be
> > > any kind of
> > > > connection between the two, as long as they're
> > > badly isolated the
> > > > signal's electromagnetism might affect the cable
> > > next to it. I think
> > > > that's what's happening here.
> > > > >
> > > > > ----- Original Message -----
> > > > > From: ilanode
> > > > > To:
> > >
> > analogue_systems@yahoogroups.com <analogue_systems%40yahoogroups.com>
> <analogue_systems%40yahoogroups.com>
> > > > > Sent: Thursday, August 16, 2007 10:33 AM
> > > > > Subject: [analogue_systems] Re: RS15 rack
> > > crosstalk between
> > > > doepfer modules
> > > > >
> > > > >
> > > > > The Doepfer power connector has 16 pins - 2 of
> > > them belong to the
> > > > > CV-bus on the power distributing board. If ASys
> > > follows Dopefer's pin
> > > > > out with their RS15 power sockets this would
> > > explain how a CV can
> > > > > spread without a patchcord. Mind you, it's still
> > > strange since you
> > > > > actually should have to connect a CV to one of
> > > the 4 VCOs to controll
> > > > > all of them via the CV-bus...
> > > > >
> > > > > BTW On the Doepfer bus boards are jumpers to
> > > (dis-)connect the CV bus.
> > > > >
> > > > > --- In
> > >
> > analogue_systems@yahoogroups.com <analogue_systems%40yahoogroups.com>
> <analogue_systems%40yahoogroups.com>,
> > > > "TacocaT" <zpardos@> wrote:
> > > > > >
> > > > > > Well I have four of them and I don't want any
> > > of them near the power
> > > > > > supply. So I don't think that's an option.
> > > However, can you please
> > > > > > inform me theoretically as to how the signal
> > > could be passing
> > > > from one
> > > > > > module to another without patch cables.
> > > > > >
> > > > > > Thanks
> > > > > >
> > > > > > --- In
> > >
> > analogue_systems@yahoogroups.com <analogue_systems%40yahoogroups.com>
> <analogue_systems%40yahoogroups.com>,
> > > > alex banks
> > > > > > <alexander.banks@> wrote:
> > > > > > >
> > > > > > > Try moving the VCOs apart?
> > > > > > >
> > > > > > >
> > > > > > > On 15 Aug 2007, at 14:38, TacocaT wrote:
> > > > > > >
> > > > > > > > Actually I have not yet installed my VCA.
> > > If I plug my
> > > > headphones
> > > > > > > > directly into the output of one VCO I can
> > > faintly hear the
> > > > pitch of
> > > > > > > > the second VCO if I, say, do a frequency
> > > sweep with the POT
> > > > of the
> > > > > > > > second VCO. What would be allowing the
> > > signal from the second
> > > > > VCO to
> > > > > > > > leak into the output of the first VCO? I
> > > am not using ANY
> > > > > patches for
> > > > > > > > this.
> > > > > > > >
> > > > > > > > thanks
> > > > > > > >
> > > > > > > > --- In
> > >
> > analogue_systems@yahoogroups.com <analogue_systems%40yahoogroups.com>
> <analogue_systems%40yahoogroups.com>,
> > > > "monroeeskew"
> > > > > > > > <monroe.eskew@> wrote:
> > > > > > > > >
> > > > > > > > > That is strange. The modules are
> > > independent and don't pass
> > > > > signals
> > > > > > > > > through the power supply. Is the one VCO
> > > still connected to a
> > > > > > VCA or
> > > > > > > > > mixer while you do this? Perhaps the
> > > VCA/mixer is not
> > > > completely
> > > > > > > > > attenuating when it should be, so you
> > > may need to adjust a
> > > > > trimpot
> > > > > > > > on it.
> > > > > > > > >
> > > > > > > > > One thing I have noticed is that no
> > > matter how much I
> > > > adjust my
> > > > > > ASys
> > > > > > > > > VCA or the volume CV on my keyboard, the
> > > signals cannot be
> > > > 100%
> > > > > > > > > attenuated and can still be heard very
> > > faintly if I turn
> > > > up my
> > > > > > > > speaker
> > > > > > > > > loud enough. I can tolerate this though.
> > > > > > > > >
> > > > > > > > > --- In
> > >
> > analogue_systems@yahoogroups.com <analogue_systems%40yahoogroups.com>
> <analogue_systems%40yahoogroups.com>,
> > > > "TacocaT" <zpardos@>
> > > > > > wrote:
> > > > > > > > > >
> > > > > > > > > > Hello,
> > > > > > > > > >
> > > > > > > > > > I just recieved my rs15 case and I put
> > > a couple of doepfer
> > > > > style
> > > > > > > > VCOs
> > > > > > > > > > into th case and I can hear one VCO's
> > > output (faintly)
> > > > > > through the
> > > > > > > > > > other's output (no patches). This
> > > shouldn't be happening.
> > > > > Does it
> > > > > > > > > > happen for anyone else? Is there also
> > > crosstalk when
> > > > using the
> > > > > > > > ASys
> > > > > > > > > > power connectors?
> > > > > > > > > >
> > > > > > > > > > I wonder if the doepfer racks have
> > > this problem at all.
> > > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > > [Non-text portions of this message have been
> > > removed]
> > > > > > >
> > > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > >
> > >
> > ----------------------------------------------------------
> > > > >
> > > > >
> > > > > No virus found in this incoming message.
> > > > > Checked by AVG Free Edition.
> > > > > Version: 7.5.484 / Virus Database: 269.11.19/955
> > > - Release Date:
> > > > 15.08.2007 16:55
> > > > >
> > > > >
> > > > > [Non-text portions of this message have been
> > > removed]
> > > > >
> > > >
> > > >
> > > >
> > >
> > >
> > > [Non-text portions of this message have been
> > > removed]
> > >
> > >
> > === message truncated ===
> >
> >
> > Bakis Sirros - Parallel Worlds / Interconnected / Memory Geist
> > [Doepfer_a100] group owner
> > http://www.parallel-worlds-music.com
> > http://www.myspace.com/parallelworldsmusic
> > http://www.myspace.com/interconnectedmusic
> > http://www.myspace.com/memorygeist
> > http://www.DiN.org.uk
> > http://www.shimarecords.co.uk
> > http://www.rubber.gr
> > Athens-Greece
> >
> >
> >
> >
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>  
>


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