Doepfer

The ring mod on my nord modular also can be modulated from no 
modulation, through amplitude mudlation and then to ring modulation 
with a single "knob", and this change can be "voltage" controlled. I 
mentioned once before on this list how useful that feature was.  I 
have rigged up a similar response in the analog world using a PAIA 
balanced modulator and several Doepfer modules.  The basic idea is 
that a bipolar modulating signal is given a positive bias so that it 
is all positive.  When a vca for the control voltage is opened, the 
control voltage goes from no modulation to amplitude modulation.  
When the bias signal is gradually eliminated, the modulation goes 
from straight am to ring modulation. 

Now, if I am doing this correctly, these are two separate processes 
which the Nord combines in a single control.  When you go from from 
straight to AM to RM, I would assume the bias starts to be removed 
when the control reaches the halfway "am" mark.

If I recall correctly from the days of my long lost and misspent 
youth, the Buchla 200 had a similar feature in its ring modulator.  
Maybe one of the more technical folk on this list can confirm if it 
was done in the way I have outlined above.  (Peter, are you there?)


SHM

--- In Doepfer_a100@yahoogroups.com, pH <ph@c...> wrote:
> On 2/13/05 4:25 PM, "Josue Arias" <josue.arias@g...> wrote:
> 
> > 
> > Yeah, my serge ring goes from VCA thru AM to Ringmodulator with 
a pot, is
> > Great
> 
> 
> and I think the Doepfer RM is one of the weaker modules, that IC 
just isn't
> very good for it, IMHO. I have many ring mods (10+)  and the 
Doepfer is the
> one I never use, not that it isn't useful but if you have better...
> Ken Stone's Real ring mod is my favorite, but it is also basic
> http://www.cgs.synth.net/modules/cgsrr.html
> 
> most current  others(AS, Technosaurus, Blacet) use the AD633, and 
I have
> some that use the AD533. BTW: What does the EH Frequency Analyzer 
use?
> The  MC1496 just isn't that good--that's what the doepfer uses and 
the DOD
> gonkulator.
> So a different take on it would welcomed. Or something unique but 
similar
> would be even better. Maybe a weird waveshaper/ring mod/VCA?
> 
> And will there be a A-200 series? seems odd that there's such need 
to keep
> it all "100" like "101-2," 101-3" etc....
> best,
> phil