[sdiy] Looking for 2164 12db/oct slopes bandpass filter design.. more detailed..

The Old Crow oldcrow at oldcrows.net
Mon Mar 10 23:49:20 CET 2014

   I just got done proofing the production version of my MOTM-480 CS-80 
filter MkII, which uses V2164s in place of the late and lamented 
CA3280s.  It is much quieter while using fewer parts.  I'll have DIY 
info for the 5U/MU-panel bare boards out soon.

   There is a thread on muff's about it, 

(thanks to Tom Wiltshire, David Dixon, Olivier Gillet and Robert Rich 
for suggestions and remarks over the past year!)


On 3/10/2014 9:48 AM, Neil Johnson wrote:
> Jean-Pierre Desrochers wrote:
>> I'm looking for a 2164 based  bandpass filter design
>> Built with one separate 2 poles lowpass (12db/oct) (2164 section #1+2)
>> In series with one separate 2 poles highpass (12db/oct) (2164 section #3+4).
>> These 2 blocks in series  make it possible to feed 2 separate & different
>> cutoff CV's
> This is, amongst other things, similar to the Yamaha CS-80 voice
> structure.  See point #2 here:
>    http://users.ece.gatech.edu/~lanterma/ems11/projectideas_sp11.html
> Neil

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