The Maxim DS1660 is bipolar +/- 5 volt. Will this work? I read the
Max5160 datasheet could it be used with an op amp for feedback
control?
--- In
korgpolyex@yahoogroups.com, "korgpolyex800"
<korgpolyex800@...> wrote:
>
> Thanks for that Dave,
>
> The problem I'm having right now is choosing the right digital
> potentiometer for the job. The versions that I got as samples from
> Maxim are only 5Volt operation. No good for the Poly because the
audio
> is 10V (-5<->+5).
>
> Analog devices does one that is 10-30V but then the logic control is
> difficult because it would "see" logic zero only at -5 volts which
> doesn't match up the Poly either.
>
> I have the same problem with the FM mod too because you want to be
> able vary the amount of DCO that is injected into the VCF. Once
again,
> the range is -5<->+5.
>
> So I am kinda scratching my head right now.
>
> Mike.
>
>
> --- In korgpolyex@yahoogroups.com, "David Mochen" <davidmochen@>
wrote:
> >
> > Hi
> >
> > Just a small note... Atom's great design has been tweaked a bit by
> this guy Olaf, who replaced the 50k cutoff pot with a 100k pot for a
> broader response. I am using 100k on my Poly and the sweeping range
is
> very very sweet. You might want to try 50k and 100k for your
aTomaHawk
> board :)
> >
> > Of course Mike, you might as well want to add a switch for
toggling
> on/off MoogSlayer. Olaf did this also via a hardware switch...
> >
> > thanks galore
> >
> > Dave
> >
> > ps: glad that the aTomaHawk moniker caught on! :D
> >
> > ----- Original Message -----
> > From: korgpolyex800
> > To: korgpolyex@yahoogroups.com
> > Sent: Monday, March 17, 2008 2:21 PM
> > Subject: [korgpolyex] Moog Slayer mod - question
> >
> >
> > Hi Atom,
> >
> > I am working on the new aTomaHawk board mod kit and have a
question
> > for you.
> >
> > Is the only reason you replaced VR2 with a pot so that you could
> > control VCF cutoff via a knob instead of via the VCF cutoff
parameter?
> >
> > Because it appears to me that providing cut off control via the
> > existing circuitry will work just fine. The goal is to provide
a knob
> > to control control cut off.
> >
> > Then, you replaced VR5 so that you could really push the
resonance
> > into self oscillation. That will definitely need a digital
> > potentiometer put in its place. However, I am wondering why you
use a
> > log pot. I would have thought that the resonance response on the
> > filter chip would have been linear. And you ground one side
which is
> > completely different to the way the trimmer is set up. Why?
> >
> > Thanks for your help,
> >
> > Mike.
> >
>