thank you,
so you confirm it is the clock noise.
in the text they sayed : e.g. to
control an external clock suppression filter as the A-188-2 is not
equipped
with such a filter (same as for the A-188-1).
so it is possible to supress this clock noise, do you know how i can do
Is there a specific module wich permit to avoid this clock noise

--- In Doepfer_a100@yahoogroups.com , "P. Hendricks" <ph@...> wrote:
>
> you may want to read the description of the module, everything you
state
> seems normal for 188 modules, that's how they were designed:
>
> from: http://www.doepfer.de/A1882.htm
>
> The A-188-2 uses the same high speed VCO (HSVCO) for the BBD clock as
the
> A-188-1. The clock and consequently the delay time can be controlled
> manually (delay control) and by the two control voltage inputs CV1 and
CV2.
> The sensitivity of CV1 is approximately 1V/oct. CV2 is equipped with a
> polarizer (the new type of potentiometers with center detent too). The
HSVCO
> has a clock output available that is normalled to the clock input
socket.
> These sockets can be used to link different BBD modules and to run
them with
> the same clock. But even other applications with frequency dividers
(e.g.
> A-163) or PLL (e.g. A-196) are conceivable. A voltage composed of the
manual
> delay control, CV1 and CV2 is available at the CV out socket, e.g. to
> control an external clock suppression filter as the A-188-2 is not
equipped
> with such a filter (same as for the A-188-1).
>
> Important note (especially for A-188-1 users): The A-188-1 uses single
BBD
> circuits, which can be adjusted to minimize the clock noise as the
outputs
> of the used BBD circuits are symmetrical (for details please refer to
> A1881_adjustment.pdf, trimming potentiometer P10). By way of contrast
the
> BBD circuit used in the A-188-2 (MN3011) has six asymmetrical outputs
that
> cannot be adjusted to minimize the clock noise. In addition the clock
noise
> of the six outputs adds up. From there the clock noise of the A-188-2
is
> more intense than of the A-188-1. This is caused by the properties of
the
> MN3011 but not a mistake of the module ! If you feel that the clock
noise is
> too much you have the right to return the unused module within 14 days
(i.e.
> the module has no scratches or prints, e.g. from srewing into the
frame).
> On 5/5/07 12:51 PM, "patate_le_mage" patate.pat@... wrote:
>
> > Hello everybody,
> > my english is not very good but i try to explain my problems.
> > when i use the A-188-2, if i try to use the delay knob in his first
> > half, all the output give a high frequency ( depend on the delay )
> > sound and i can't suppress it without going thru a LP-VCF wich
> > drastically modify my sound, A notch filter does'nt supress it
because
> > it's not a sinus sound. Is this sound the clock sound wich is
describe
> > in the module's presentation
> > My second problem is when i try to use the clock in : what kind of
> > signal have i to put in, is it only to chain BBD modules
> > Third, i haven't really understood the use of the CV out on this
> > module : what exactly is going out.
> > thanks for your answer.
> >
> > Patrick Maurel
>