Doepfer

Dear Dieter,

Thanks, found the pot (p8), and am playing around to find setting(s)
I like. It's an awesome filter by the way.

Cheers Martin


>
> Martin,
> 
> there is a trimming potentiometer on the A-108 board that is used to
adjust
> the resonance so that self-oscillation just appears at the full
clockwise
> position of the resonance control. This trimming potentiometer is
adjusted
> for the default feedback (48dB output). If another output is used for
> feedback the levels and phase relations are a bit different and you
obtain a
> different resonance behaviour as the setting of the trimming 
potentiometer
> is optimized for the default 48dB feedback. This is why you have to
amplify
> the signal. You could try to re-adjust the trimming potentiometer
for the
> 24dB feedback loop but then the setting is not optimal for the
default 48dB
> feedback loop.
> 
> Best wishes
> Dieter Doepfer
> 
> > -----Ursprüngliche Nachricht-----
> > Von: Doepfer_a100@yahoogroups.com
> > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von marrtin606
> > Gesendet: Mittwoch, 31. Mai 2006 21:01
> > An: Doepfer_a100@yahoogroups.com
> > Betreff: [Doepfer_a100] Re: resonance for a108 when feeding 24db
output
> > into feedback input?
> >
> >
> > Dear Ingo, Bakis,
> >
> > you're of course right I don't need the feedback to get some form of
> > resonance - but the point was to understand why i couldn;t get
> > resonance using only 4 poles.
> >
> > I'm pretty sure the feedback is internally patched to the 48db -
> > apart from the manual and schematics suggesting this, you can also
> > try this by directly patching the 48db out to the feedback in: you get
> > just the same as when nothing is plugged into the feedback in.
> >
> > > if you want, of course, you can patch the res input
> > > with any of the filter outputs, for different
> > > resonance behaviour.
> > > regards,
> > > Bakis.
> > >
> >
> > That was precisely what i was trying to do, but didn't get much
> > resonance. And that surprised me, because 4 poles/24db should be
> > sufficient for that.
> >
> > I found out now that if I amplify the 24db signal a bit before feeding
> > back (with a vca or externally), I also can get into resonance using
> > only 4 poles. I'm still curious to hear what other 108 users find!
> >
> > Cheers Martin
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >
> >
>