Doepfer

afaik all analogue frequency shifters, no matter which brand,
share the same problem. please somebody correct me if i'm wrong.
the modulator signal cannot be suppressed for 100%, there is
always a portion of the modulator signal intruding the shifted
output. with careful calibration this bleedthru can be minimized,
but not totally eliminated. some designs have a sort of automatic
noise gate (bode used the term "squelch"), which mutes the output
when the input signal level drops below a certain threshold,
consequently cutting out the bleedthru and other unwanted
artifacts during signal intermissions.
this trick can be done easily by using an a119, a vca and maybe
a slew limiter or envelope to get smoother transitions between
"on" and "off".

best wishes

ingo



--- In Doepfer_a100@yahoogroups.com, "partlydrone" <partlydrone@...>
wrote:
>
> Not sure that's true.
> 
> Anyway, found the callibration instructions, will have a fun time with
> these in the next week or so. Looks like it can be done without an
> oscilloscope, which is good because mine is for some reason missing
> its leads at the mo...
> 
> http://www.doepfer.de/service/A126_adjustment.pdf
> 
> --- In Doepfer_a100@yahoogroups.com, "selfoscillate"
> <synaptic_music@> wrote:
> >
> > --- In Doepfer_a100@yahoogroups.com, "partlydrone" <partlydrone@>
> > wrote:
> > >
> > > Hi there, I've just been playing with my new a126 VC Frequency
> > > Shifter, and I notice now that the initial rush of joy subsides that
> > > the oscillator bleeds through to the output, quite loudly. Is this
> > > normal, or can it be fixed with some recallibration, twiddling a few
> > > potentiometers? A question for the great Dieter I guess...
> > >
> > 
> > yes, it is normal behaviour that the oscillator bleeds through,
> > you find that on all frequency shifters.
> >
>