Doepfer

Mr Doepfer, 

This explains why the A-110 sounds like they're muted. 

Thank you very much for the explanation!

Best, 
Jacob


--- In Doepfer_a100@yahoogroups.com, <yahoo@...> wrote:
>
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von palicki
> > Gesendet: Samstag, 22. August 2009 14:21
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: [Doepfer_a100] Precision adder/Sequential switch/Sequencer
> > question
> >
> >
> > Hi all,
> >
> > Here comes a question regarding a strange muting behaviour of my
> > A-151 Sequential switch.
> >
> > I have a Precision adder (A-185-2), a Sequential switch (A-151)
> > and two A-110's set up in the top row of an 9HE low cost case.
> >
> > The CV output of one row of an MAQ 16/3 sequencer is connected to
> > one of the inputs of the Precision adder (switch in "+" mode").
> > CV values from the MAQ are the distributed by the A-185-2 to both
> > oscillators through the system bus.
> >
> > I would then like to offset the sequence from the MAQ by using
> > the Sequential switch and connect it into another of the Precison
> > adders inputs.
> >
> > But when I connect the O/I of the Sequential switch into another
> > input of the Precision adder (switch in "+" mode"), and when
> > there is no input to the Sequential switch (nothing plugged in
> > into I/O 1 through 4), the oscillators go mute! The sound
> > disappears completely.
> >
> > No CV -> A-151 -> A-185-2 -> System bus = mutes A-110 = no sound!
> >
> > Could someone explain what is going on?
> >
> > Thanks,
> > Jacob
> 
> The inputs of the A-185-2 are very high impedance inputs to avoid any load
> of the CV connected to it. If you insert a patch cable with an open end into
> one of the A-185-2 inputs the input in question does not "know" which
> voltage is applied and will generate a random voltage (usually very high or
> low, i.e. ~ +12V or -12V). If the output of the A-185-2 is connected to a
> VCO the frequency will go ~ 12 octaves up (or down) and it seems that the
> VCO does no longer generate a signal.
> 
> The same happens when you connect an input of the A-185-2 to an A-151 socket
> that is not addressed.
> 
> Remark: an open input is not the same as a grounded input (0 V) !
> 
> Best wishes
> Dieter Doepfer
>