Doepfer

Hi all. 
Up untill the other day I haven't bothered using a chromatic tuner 
for my oscillators. When I did use one I found an interesting 
phenomenon. when tuning to any note my a-110 was so flat that the 
potentiometer did not allow it to be tuned up as far as it needed to 
go. Do you think that this could be an artifact of multing my cv 
signal before sending to my a-110 and a-111 (the only osc modules I 
have)?

It really hasn't mattered when I use single osc sounds or when 
syncing the oscillators, but for what I was doing it was 
important... I really don't want to have to tune all my other 
insturments down just to accomodate one oscillator.

Thanks, 
Ben

--- In Doepfer_a100@yahoogroups.com, "kali_the_black <poictesme@e...>" 
<poictesme@e...> wrote:
> Do you think that this could be an artifact of multing my cv 
> signal before sending to my a-110 and a-111 (the only osc modules I 
> have)?

Yes that's what I think.

Joe

I don't remember off hand, but it's a pretty serious tuning 
difference. I thought that the drop in voltage caused by using 
multiples was enough to make a difference in tuning across a range, 
but not the same difference across the board.
I'll check that out when I get home tonight... 

Is there a calibration for the tuning inside the module that can be 
adjusted? 

thanks.
ben



--- In Doepfer_a100@yahoogroups.com, "Joe Buechler 
<buechlerjoe@t...>" <buechlerjoe@t...> wrote:
> --- In Doepfer_a100@yahoogroups.com, "kali_the_black 
<poictesme@e...>" 
> <poictesme@e...> wrote:
> > Do you think that this could be an artifact of multing my cv 
> > signal before sending to my a-110 and a-111 (the only osc modules 
I 

> > have)?
> 
> Yes that's what I think.
> 
> Joe

Hi Ben,

> Is there a calibration for the tuning inside the module that can be 
> adjusted? 

If you need to go to that extent, the full module set-up procedure is 
described in the A-110 Service Manual, which is available on 
Doepfer's website (go to th 110 module description). From memory it's 
pretty straightforward: let it warm up; adjust the scale so that 1V 
jumps double the frequency; set the absolute frequency so that 0V 
input gives the correct pitch. There's also an adjustment for 
temperature, but I think you have to temporarily de-solder something 
to do it.

Tim

It will be a simple test to use the tuner again, with one VCO, 
without the multiples. That will answer the question.

A voltmeter measurement of the raw CV, and then the CV patched thru an 
A180 multiples, is also quite revealing, even if the voltage isn't 
"split"

Joe

--- In Doepfer_a100@yahoogroups.com, "kali_the_black <poictesme@e...>" 
<poictesme@e...> wrote:
> I don't remember off hand, but it's a pretty serious tuning 
> difference. I thought that the drop in voltage caused by using 
> multiples was enough to make a difference in tuning across a range, 
> but not the same difference across the board.
> I'll check that out when I get home tonight... 
> 
> Is there a calibration for the tuning inside the module that can be 
> adjusted? 
> 
> thanks.
> ben
> 
> 
> 
> --- In Doepfer_a100@yahoogroups.com, "Joe Buechler 
> <buechlerjoe@t...>" <buechlerjoe@t...> wrote:
> > --- In Doepfer_a100@yahoogroups.com, "kali_the_black 
> <poictesme@e...>" 
> > <poictesme@e...> wrote:
> > > Do you think that this could be an artifact of multing my cv 
> > > signal before sending to my a-110 and a-111 (the only osc 
modules 

> I 
> > > have)?
> > 
> > Yes that's what I think.
> > 
> > Joe