[sdiy] hot rod 2044, was Re: "Reviving" the CEM3396

[Magnus Danielson]

From: "john mahoney" <jmahoney at gate.net>
Subject: [sdiy] hot rod 2044, was Re: "Reviving" the CEM3396
Date: Thu, 2 Sep 2004 12:16:15 -0400
Message-ID: <00dd01c49108$2c46f470$6500a8c0 at BABYUTEST>

> Harry,
> This 3372 trick (thanks, Rainer!) sounds like what you were suggesting
> for the SSM2044, which is also a 4-pole VCF chip (not a multi-mode
> filter like the 2040). Comments?

The SSM 2044 is not the same story as CEM 3372 and SSM 2040!

Those are a bunch of OTAs while the SSM 2044 is a folder-ladder. For the
SSM 2044 would Moog-ladder tricks apply.

In theory you could do the same with a SSM 2044, but it would take 12 good
quality op-amps to get started. I kind of doubt that all the specifics of
SSM 2044 would be available in the modes, just as I doubt the different modes
one can get out of a Moog ladder is as rich as the lowpass mode.

Cheers,
Magnus


> --
> john
> 
> 
> ----- Original Message ----- 
> From: "Rainer Buchty" <rainer at buchty.net>
> 
> 
> > >Also, I've seen the tricks used in the Xpander to get a variety of
> > >filter modes out of the 3372 (15 different modes with combinations
> of
> > >LP, BP, Notch and All Pass), and I was wondering if the same
> circuitry
> > >could be applied to the VCF in the 3396
> > >
> > >http://matrix-12.tripod.com/xpsvc26.jpg
> > >http://matrix-12.tripod.com/xpsvc27.jpg
> >
> > I wonder if it'd work with a 3328 and/or 3379 as well? Or was it
> just
> > the costs of the additional 6 OPs, the 4051, 4053, and passive stuff
> > which kept other synth manufacturers from using this neat circuitry?
> >
> > Rainer
> >
>