my A-185-2 has a difference of 2cents ( tonal) between the different
switches.
this seems to be too mutch for me to name it "precision" Adder.
I hoped that i can trim this difference away.

when i think that 1 Volt is divided by 12 to get semitones,
2 cents (of a Semitone) is not much in Volts.
I think this 0,1% matching is then not enough.

The Module is _very_ useful for me.
Matching to 0,01% and paying finally a littlebit more would be the
better Deal at the end,
IMHO.


thanks
H.

--- In Doepfer_a100@yahoogroups.com , <hardware@...> wrote:
>
> > Hi,
> > as sayed in the title i like to calibrate my A-185-2 precission adder.
> > It is not exactly 1V and not all Voltage adders are exactly 1V.
> > ( no, this is no critsm )
> >
> > I must calibrate my VCOs and i like to have the precision adder as a
> > reference.
> > I see there are only two trimmers.
> > some explanations would be appreciated.
> > thanks
>
> P2 on top right edge of the pcb is used to adjust the 1V coming from the
> switches if nothing is connected to the sockets.
> P1 in the lower section of the pcb is used to adjust the overall
> amplification. There is no trimming potentiometers for each inputs
as the
> resistors in the input stages are manually selected to 0.1% by our
> manufacturer. Consequently the difference between the different inputs
> should be less than 0.1%.
>
> Best wishes
> Dieter Doepfer
>