[sdiy] CEM3340 question

[Tom Wiltshire]

LIke Werner, I’d expect to see some external scanner/crossfader circuit of some type. All the waveform outputs on the 3340 are available simultaneously, so this is not too hard to do.




> On 3 Dec 2020, at 09:57, Werner Flügel <werner.fluegel at b-tu.de> wrote:
> 
> 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.Flügel
> 
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