Doepfer

In case you want to make more tweaks to your A-124, check out Nick Keller's DIY/Modification-page at Analoguehaven:

http://www.analoguehaven.com/usercomm/diy/#vcf

Have fun!

Pierre Serné / PatchPierre
http://patchpierre.blogspot.com


--- In Doepfer_a100@yahoogroups.com, "ctujoao" <ctujoao@...> wrote:
>
> 
> Thanks for the answer. 
> Of course these measurement don't make sense. I didn't even click. 
> Could have I misread milli and micro, certainly so. 
> 
> VCAs, and control, I'll read more about that then. 
> 
> I could not resist, since it's my lesson of the  day: 
> 
> http://groups.yahoo.com/group/Doepfer_a100/photos/album/1096362407/pic/2138570574/view
> 
> 
> 
> 
> --- In Doepfer_a100@yahoogroups.com, <yahoo@> wrote:
> >
> > For all these modifications VCAs are requried. One VCA for the CV control of
> > the feedback path and two opposite controlled VCAs for the LP/HP panning
> > (nothing but the A-134 with the two inputs wired to the LP and HP outputs).
> > One cannot simply add a voltage somewhere in the circuit to obtain CV
> > control.
> > 
> > If your module consume 165...350mA something is completely wrong! Usually
> > the A-124 takes less than 30mA.
> > 
> > Best wishes
> > Dieter Doepfer
> > 
> > 
> > > -----Ursprüngliche Nachricht-----
> > > Von: Doepfer_a100@yahoogroups.com
> > > [mailto:Doepfer_a100@yahoogroups.com]Im Auftrag von ctujoao
> > > Gesendet: Donnerstag, 14. Februar 2013 23:40
> > > An: Doepfer_a100@yahoogroups.com
> > > Betreff: [Doepfer_a100] A-124 tweak tic tic.
> > >
> > >
> > > Hello there,
> > >
> > > Love the A-124. But now, how to make it even better?
> > >
> > > I got the self oscillation modifications done. Work best with a
> > > pot added that let all the screaming goodness slowly coming in.
> > >
> > > You can tap the HP or LP on each leg of the mix potentiometer.
> > > I've personally replace the "cv1" in - never used, always goes
> > > for cv2 with attenuation- with an "LPout".
> > >
> > > One thing that would be nice would be to CV control the
> > > crossfader between HP/LP, but that sounds like a lot of work, and
> > > with the extra out mention before, I can do that downstream.
> > >
> > > Then, there's the resonance... And how to get control over that
> > > wild thing.
> > >
> > > The signal that flows between the legs of the potentiometer is
> > > weird; it lives at around 5.8V when the pot is CCW, and at 5.4V
> > > when CW. However there's significantly more current going through
> > > (form 165mA to 350mA).
> > > I've got no idea how that work, could someone point out where to start?
> > >
> > > And since I'm not a messiah, but a very naughty boy, I added a
> > > jack in the signal path at the potentiometer, just to see: when
> > > an LFO, env...  is added in parallel with the original signal
> > > flowing through the pot, you can swipe the resonance wildly (full
> > > res to actually no sound, like silencing the filter, no gain)
> > > Same thing: if someone wise can explain, I'll be grateful.
> > >
> > > THanks.
> > >
> > >
> > >
> > >
> > > ------------------------------------
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> >
>