Doepfer

--- In Doepfer_a100@yahoogroups.com, "stuadh" <stuadh@...> wrote:
>
> Dear Dieter,
> 
>   I now have the Quantizers back from the shop, but they are still
> out.  Both scales (All) track accurately (using a MIDI Keyboard and
> Kenton Pro 2000 as the CV source) but the CV outs change at the wrong
> points when in chord or quint.  For example, on one, the major chord
> flips on the root, the third and the sixth (not the fifth).  Also, the
> output of one quantizer is almost one semitone below the other (all
> other things in the signal path being the same).
> 
>   To this end, I need to try myself.  Based on the Version 1 board and
> with respect to your instructions, below, can you explain where P1,
> P2, P3 and P4 are, please.
> 
> Next to the TL062CN chip = P
> The small Pot next to IC6 = P
> The pot (of the pair) closest to the CV and Trig out Sockets = P
> The pot (of the pair) closest to TS274CN chip = P
> 
> Many thanks,
> 
> Stuadh
> 
> 
> 
> 
> > >
> > > Yours Aye
> > >
> > > Stuadh
> > 
> > Short form:
> > 
> > The scale of the CV outputs is adjusted by P4 (one potentiometer for
> both
> > outputs). E.g. an A-176 can be used to generate a manually
controlled CV
> > input voltage for the A-156. When the corresponding CV input
voltage is
> > increased the CV out has to change according to the setting of the
> > quantization switches. The easiest is to use the quint setting and
then
> > check the octave intervals which have to be exactly 1.00V.
> > 
> > The scale inputs are adjusted P1 (CV In 1), P2 (CV In 2) and P3
> (Transpose
> > CV In). E.g. an A-176 can be used to generate the corresponding CV
input
> > voltage. The voltage output of the A-176 can be set to a multiple of
> 1.00V
> > (e.g. 4.00V or 5.00V) and the voltage has to be measured
> simultaneously e.g.
> > by a digital multimeter. P1 (or P2 or P3) has to be adjusted so
that the
> > corresponding CV output reads the same voltage as the input (i.e.
> 4.00V or
> > 5.00V). The finest quantization (semitone) has to be used for this
> > adjustment. Otherwise the steps are too coarse for this adjustment.
> > 
> > Best wishes
> > Dieter Doepfer


Dieter,

  I have set up the first Quantizer without difficulty, but working on
the second has shown that the output voltage is unstable (it warbles
almost as mouch as one semi-tone.  I've switched out the TL062CN and
the main processor chip (PIC16F73).  I don't have the other two chips
handy to try changing.  Is this a return to Doepfer case, or is there
something else I can try?  The problem manifests on quantizers 1 and 2
 (on the same module).  

Yours Aye

Stuadh
> >
>