Doepfer

Regarding an LPF at the output of the BBD module, I've tried that, 
and exactly like you mentioned, you filter out too many of the 
goodies, so it's useless.  It's just a matter of modifying DELAY 
CLOCK until it goes away.

--- In Doepfer_a100@yahoogroups.com, "Adam-V" <adam-v@...> wrote:
>
> Hi,
> 
> You might need to expand on a the first problem little further. 
When
> you say using an envelope as a clock source, presumably you are
> modulating the HSVCO with an envelope, not clocking the BBD with an
> envelope generator?
> 
> Regarding the high pitched noise, it sounds like you are describing
> clock noise which is quite normal and does require a LPF to be 
placed
> at the output of the BBD module in order to remove it. The obvious
> drawback of this is the potential loss of high end audio 
frequencies. 
> 
> Cheers,
> Adam-V
> --- In Doepfer_a100@yahoogroups.com, "regimental1200"
> <regimental1200@> wrote:
> >
> > I meant 4096 stages, not 2096
> > 
> > --- In Doepfer_a100@yahoogroups.com, "regimental1200" 
> > <regimental1200@> wrote:
> > >
> > > I get a similar problem all the time!!!!
> > > 
> > > Happens on a very intermittant basis.  While using an envelope 
as 
> > > clock source, I smack a key and can get that typical repeating 
and 
> > > pitch shifting "Daaaaaaaa-daaaaaaaa-daaaa-da-da-da-da da" 
noise, 
> > and 
> > > then when it feels like it, it stops responding.
> > > 
> > > Also, depending on how I have the delay clock knob position, 
I'll 
> > > get this extremely high resonant noise.  Sometimes it's more 
> > subtle 
> > > like the frequency it's producing is so high that it's not in 
the 
> > > audible spectrum, but its enough to hurt my ears.  I fear that 
> > I've 
> > > even damaged a bit of my high-end with this....
> > > 
> > > Is this a defect in the unit, or is that the clock noise that 
the 
> > > manual talks about generally requiring an LPF?  And if it is, 
> > where 
> > > exactly should the LPF be inserted?
> > > 
> > > 
> > > --- In Doepfer_a100@yahoogroups.com, <hardware@> wrote:
> > > >
> > > > > Hi all,
> > > > >
> > > > > My tapped bbd module suddenly has a limited range, it can 
now 
> > > only
> > > > > do short delaytimes, probably 25-40% of the range it 
should 
> > > have. In
> > > > > other words: it can't produce the aliasing sound anymore. 
The 
> > > first
> > > > > time I fired it up it was ok, second time it had this 
problem. 
> > > Any
> > > > > ideas?
> > > > >
> > > > > greetings, Anton
> > > > 
> > > > Sounds like a fault. Probably the "heater" of the 
temperature 
> > > controlled
> > > > logarithmic converter of the HSVCO is defective. If you are 
able 
> > > to replace
> > > > an integrated circuit we can send you a new one. As all 
circuits 
> > > are
> > > > equipped with sockets no soldering is required but only 
removing 
> > > the old
> > > > circuit and inserting the new one.
> > > > 
> > > > Please tell me your postal address (directly to me, not to 
the 
> > > Yahoo group)
> > > > and we will send you the spare part if you agree. Otherwise 
> > please 
> > > send the
> > > > module for repair.
> > > > 
> > > > Best wishes
> > > > Dieter Doepfer
> > > > (hardware@)
> > > >
> > >
> >
>