[sdiy] "Reviving" the CEM3396

[rizacan]

Tim Parkhurst wrote:

>Well, I guess there's really no need to 'revive' the 3396 if there are over
>3,000 of them floating around. ;) Glad to hear Paul S has a good stock. By
>the way, I've bought more than a dozen chips from Paul, and the price /
>service was great. And no, I'm not on the MOTM payroll.
>
>Yes, the 3396 doesn't process external waves well, but that's not really
>what it was designed for. Drive it with a simple square wave and it's pretty
>happy. Set up properly, the 3396 offers a PWM square and a voltage
>controlled Tri-Saw wave. I keep pointing to the Matrix 6 as a completely
>stunning example of what can be done with the 3396. Yes, it's not all things
>to all people, but you've got to admit it does an amazing amount of stuff
>especially for its size and price (even when new). As far as the VCF is
>concerned, yes it's just a standard 24dB low pass, but it definitely has
>some 'guts.' 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
>
It can be appllied to CEM3396 but then you can not use  CEM3396's VCA. 
Also the  filter resonance
became problematic. Because  for 3 Poll lowpass filter it is neccesery 
more feedback to oscilate(8 times) then 4Poll lowpass .
For this reason CEM3396's filter may not oscilate at 3Poll 
configuration(It's max feedback amount is less then 8)

>http://matrix-12.tripod.com/xpsvc26.jpg
>http://matrix-12.tripod.com/xpsvc27.jpg
>
>Anyway, this is probably all just a moot point anyway, but I suppose the
>3320 or the 3372 would be the next on my 'wish list', followed closely by
>one of the VCO chips. Is there really a big difference between the 3320 and
>3372 VCFs? Just wondering since there are those who proclaim the 3320 as the
>'best' Curtis VCF.
>
>Cheers!
>
>
>Tim (If nobody hears a cow, does it go 'moot'?) Servo
>
>"Imagination is more important than knowledge." - Albert Einstein
>
>
>
>
>  
>
>>-----Original Message-----
>>From: Harry Bissell Jr [mailto:harrybissell at prodigy.net]
>>Sent: Wednesday, September 01, 2004 2:13 PM
>>To: Paul Schreiber; Tim Parkhurst; 'Rainer Buchty'; karl dalen
>>Cc: synth-diy at dropmix.xs4all.nl
>>Subject: Re: [sdiy] "Reviving" the CEM3396
>>
>>HAH !!!
>>
>>wide or skinny ???   :^P
>>
>>Actually I'm playing with these chips and I think
>>there are more fun CEMs.  The filter is pretty much
>>fixed internally (not as flexible as the CEM3320)...
>>The waveshapers are nice but basically they are
>>DCOs.  The pulse width comparator has no hysteresis...
>>so if you try and run external waves through it... you
>>might get some static if you remain in the linear
>>region.
>>
>>The mixing etc is pretty cool. But for a CEM slated
>>for resurrection, I'd chose some others
>>
>>H^) harry
>>
>>--- Paul Schreiber <synth1 at airmail.net> wrote:
>>
>>    
>>
>>>>My picks for Curtis chips to resurrect would be
>>>>        
>>>>
>>>(in order of potential
>>>      
>>>
>>>>usefulness): 3396 (waveshaper/VCF/VCA), 3372
>>>>        
>>>>
>>>(VCF/VCA) and 3374 (dual VCO).
>>>
>>>
>>>Well, I have over 450 in stock for shipment, and
>>>know where 3000 more are :)
>>>
>>>Paul S.
>>>
>>>
>>>      
>>>
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