Analogue systems

--- In analogue_systems@yahoogroups.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 
>   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, "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, 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, "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, "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]
>   > >
>   >
> 
> 
> 
>    
> 
> 
>
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>