Hello Roland,

I took a look at the A-110-4 circuit and have to correct my last statement.
The bus CV concept of the A-110-4 is also version 1. I wrote that only
A-110-1 uses version 1. That was wrong, also A-110-4 uses version 1.

I have to agree that the bus CV concept of the several VCOs is not
consistent. It has to do with the fact that the different VCOs were designed
over a period of 20 years and that we tried to react to the customers
likings. For future designs (and redesigns of older modules) we plan to
install jumpers where the customer can choose the type bus normalling
(version 1 or 2). The same applies also to bus gate signals.

I should probably prepare a table that informs about the normalling version
of the different VCOs.

Best wishes
Dieter Doepfer

> hi
> hope i understand the issue.
>
>
>
> the A-110-4 can "normalizing".
>
> i use the cv-gate bus in all cases.
>
> i have two A-110-4, a A-110-2 and a A-143-4 on a A-185-2.
> e.g. when sending a sequence to this A-185-2, send the cv from
> front socket to a A-156
>
> and back to the 1V/Oct front socket of the A-110-4's interrupts
> the bus CV from them.
> but sending the signal from the A-156 to the A-110-2 or the
> A-143-4 adds the bus cv to them.
>
>
> from the A-110-4 short instruction:
>
> important note: Please remove the bus jumper (JP3 "BUS CV") if no
> CV transmitter is installed on the same bus (e.g. a
> Midi/USB-to-CV interface A-190-x or a bus access module A-185-x).
> The A-110-4 applies a small voltage with high impedance (100k) to
> the CV line of the bus when the bus CV jumper is installed. This
> may affect other modules that pick-up CV from the bus (e.g. other
> VCOs). As soon as a CV transmitter is installed on the same bus
> the high impedance voltage of the A-110-4 is overwritten and no
> problem occurs !
>
>
> Additional technical notes:
>
>
> The control voltage applied to the socket 1V/Oct is added to the
> control voltage coming from the bus (interruptible by removing
> the jumper JP2). Connecting a cable to the socket 1V/Oct does not
> interrupt the bus CV connection !
>
>
> please see the .pdf
>
>
>
> ciao
> roland
>
>
>
>
>
>
> Von: " james.husted@... [Doepfer_a100]" < Doepfer_a100@yahoogroups.com >
> An: Doepfer_a100@yahoogroups.com
> Gesendet: 17:32 Mittwoch, 25.Oktober 2017
> Betreff: Re: 1 Question regarding the CV bus
>
>
>
>
> I have to say the second method is nice when those times come up
> when adding CVs is what you want but really is not a good
> solution for when you don’t want to do that. It means you have to
> pull the module out to turn it OFF instead of the much simpler
> act of inserting a jack. I’m a firm user of the CV/Gate bus and
> almost every cabinet I have has a A-185 Bis Access module in it.
> I often mix buss use and non buss use in one cabinet and the
> normalizing really makes this easy. I can see where in the VCO
> modules that have only one CV input that this is much more
> useful, but would suggest that the VCOs that have two CV ins,
> that the normalized signal go to the 1v/oct input (with a jumper)
> and the variable CV input be made to have a 1v/oct response when
> the pot is turned fully CW. Then the mixing action could still happen.
> -James
>
> > On Oct 25, 2017, at 4:16 AM, yahoo@... 1
> < Doepfer_a100@yahoogroups.com > wrote:
> >
> > There are two versions how a VCO may optionally access the bus:
> >
> > Version 1. The CV coming from the bus is wired to the switching
> contact of
> > the socket at the front panel (provided that the corresponding jumper is
> > installed). In this case inserting a plug into the socket at
> the front panel
> > interrupts the bus CV.
> >
> > Version 2. The CV coming from the bus is added to the CV applied to the
> > socket at the front panel (provided that the corresponding jumper is
> > installed). In this case both CVs are added.
> >
> > In the beginning of the A-100 version 1 has been used for the A-110 (now
> > A-110-1). But many customers suggested that it would be a
> better solution to
> > add the two CVs. That way one could combine e.g. the CV coming from a
> > sequencer and a midi interface (e.g. for transpose) without the
> need of an
> > additional precision adder.
> >
> > As far as I remember only A-110-1 uses version 1, all later
> VCOs use version
> > 2. If version 1 is preferred the module has to be modified by
> wiring the bus
> > CV to the switching contact of the CV socket at the front panel
> and removing
> > the bus CV jumper.
> >
> > Best wishes
> > Dieter Doepfer
> >
> >
> >
> >> Hi to you all,
> >>
> >> for some reason I had it in my head that all of the A-100 VCOs
> >> had their 1v/o input jacks normalled to the CV bus (once the
> >> correct jumpers are set) but I have just discovered that this is
> >> not the case. My setup is as follows:
> >>
> >> A-1852 Precision Adder
> >>
> >> CV bus
> >>
> >> A-111-1
> >> A-110-1
> >> A-110-4
> >> A-110-6
> >>
> >> Having now re read the manuals, it appears only the A-110-1 has a
> >> normalled jack, so that by plugging into the 1 v/o you break the
> >> CV bus connection; the other VCOs keep getting a bus signal. Is
> >> there any way of normalling these other jacks so they behave in
> >> the same way My wish is to be able to plug in a CV to the
> >> precision adder but then override that if I want to.
> >>
> >> Regards,
> >>
> >> Neil
> >
> >
> >
> > ------------------------------------
> > Posted by: < yahoo@... >
> > ------------------------------------
> >
> >
> > ------------------------------------
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