[sdiy] CEM3340 question

Matthias Herrmann matthias.herrmann at fonik.de
Thu Dec 3 11:12:56 CET 2020

Indeed. Jürgen Haible and Don Tillman designed a scanner (the nine-channel version is still online), and Don's version has already been converted to 4 channels with schematics online, so this would have been an easy grab for B.


> Am 03.12.2020 um 10:29 schrieb Joel B:
> > The Behringer Neutron uses two 3340s but it has a feature that I�m not
> seeing in the CEM3340 data sheet - voltage controlled wave shape - you can
> sweep between four different shapes. It�s a little glitchy unless you
> modulate at a fairly low frequency. Yet when I look at what is available
> otherwise, especially in Eurorack format using this chip, nothing has that
> feature.
> >
> > How did Behringer implement that?
> >
> Hello,
> I don't know how Behringer did that, but I assume that it's not a part
> of the 3340. I remember a circuit Juergen Haible used, an interpolating
> scanner, for sweeping between four filter outputs (a 2240 clone and an
> Oberheim SEM-VCF IIRC). Unfortunately the legacy sites (jhaible.com and
> jhaible.info) doesn't have the files, both bring a 404 error for the
> JH4, which had that circuit.
> --
> mfG.
> W.Fl�gel
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