[sdiy] CEM VCF transconductance stage difference!

[Scott Nordlund]

I vaguely recall reading somewhere (can't really back this up...) that the VCF portions of the 3378/79/88/89 were based on the 3328, so the design may have gotten around a lot more than the 3328 chip itself.

----------------------------------------
> Date: Tue, 30 Dec 2008 01:26:21 +0000
> From: dalenkarl at yahoo.se
> Subject: RE: [sdiy] CEM VCF transconductance stage difference!
> To: tim102 at tstinchcombe.freeserve.co.uk
> CC: synth-diy at dropmix.xs4all.nl
>
> Tim!
>
>> However the 3328 remains as an oddity, in that it is also a dedicated filter
>>chip, but without the inter-stage buffering - maybe it was just cheaper than the 3320?
>
> I would guess a yes on that!
>
>>It is interesting to me (as someone late on the synth scene) that the 3320
>>seems to have outlasted the 3328, at least as it appears to me, as there are
>>still lots of filters around based on it (e.g. many of the Doepfer ones).
>
> One speculation on this may be that the 3320 was his first VCF design,
> and also became a contender to Dave Rossums even earlier 2044 design.
>
> Being the first VCF's on a rising market P1,P5,OB8 etc, 3320 and Polysix
> 2044,etc. Volumes would have been quite large, way larger then the 3328
> wich would have been sort of late follow'er up to the 3320. There are at
> least 4 or even 5 years between these two VCF designs and the only synths
> i know using the 3328 are the Bitt 99/01 and Mirage so the manufacturing
> volumes would have been larger for the 3320 i suppose!
>
> Regarding to the P5 and P10 schematics 3320 was used at least around 1980.
> P1 was manufactured in volumes of more then 10k units! It would have been
> interessting to know wich CEM chip sold the most?
>
>>Still, my idea might be intact - it will be interesting to see if anyone
>>else refutes it over the next few days!
>
> Indeed, so far it's supricingly silent! :-)
>
> Btw, are there any other Curtis patents around?
>
> Reg
> KD
>
>
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