[sdiy] Korg 35 chip

[David G. Dixon]

I don't know (yet), but I'll figure something out.  I gotta look at the
transfer functions, and see if there is an equivalent topology which uses
integrators (or maybe I'm smoking crack...)

> Hi David,
> 
> For the OTA type MS20 filter, how would you get around the 2164 "output
> should go to a virtual earth point" issue?
> 
> Regards,
> Stewart.
> 
> 
> David G. Dixon wrote:
> >> It's the world's dirtiest Sallen & Key low pass filter design - I can't
> >> believe how noisy the filter resonance gets on this thing.
> >>
> >> I had the opportunity to play with a later OTA-based MS-20 today - the
> >> gulf between the two filter designs is enormous!
> >>
> >
> > Which one do you prefer?
> >
> > Now that I've finished my 2164 4P LPF (panelizing it tonight!), I'm
> thinking
> > that my next project will be a clone of the later MS-20 HP-LP filter,
> only
> > with 2164 VCAs (and, thus, no expo converter) instead of OTAs.
> >
> > I might do something with the older MS-20 filter, but I haven't decided.
> >
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> >