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Re: A-124 tweak tic tic.

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  • NetPierre
    In case you want to make more tweaks to your A-124, check out Nick Keller s DIY/Modification-page at Analoguehaven:
    Message 1 of 4 , Feb 20, 2013
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      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
      > >
      > >
      > > > -----Urspr√ľngliche 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
      > > >
      > > >
      > > >
      > >
      >
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