[sdiy] Seeking examples for Wed lecture

[HOSHUYAMA]

Hello, Aaron and Yves,

MS20 filter schematic:
  http://machines.hyperreal.org/manufacturers/Korg/MS-synths/schematics/

4-pole Sallen-Key VCF:
  http://img204.imageshack.us/img204/793/vcfadsrsmall4df.jpg

> the S&K filter :
> http://www5b.biglobe.ne.jp/~houshu/synth/VcSvf01a.gif

Actually, this is not tested.  It's more like state variable 
filter like ARP4023.
(FYI:  Derivation of 4023 from normal SVF:   http://houshu.at.webry.info/200602/article_1.html )

Best,

Sam Hoshuyama
Saitama, JAPAN

Yves Usson <yves.usson at imag.fr> wrote:
> Hi Aaron
> 
> Concerning examples of Sallen-Key OTA filters, Osamu Oshuyama as some  
> interesting desin on his
> site :
> http://www5b.biglobe.ne.jp/~houshu/synth/
> 
> the S&K filter :
> http://www5b.biglobe.ne.jp/~houshu/synth/VcSvf01a.gif
> 
> Cheers
> 
> Le 28 f騅r. 06, 〓07:26, Aaron Lanterman a 馗rit :
> 
> >
> > I'm going to show Rene's "late" MS-20 style LPF - but I'm also looking  
> > for the original LM13700 based one (along with the HPF) somewhere...  
> > all I can find is schematics of the "old" MS-20 style filter, with the  
> > weird Korg-35 chip...
> >
> > ...also I swore I had downloaded a Korg Delta schematic from  
> > somewhere, but I can't find it now - it was interesting since it was  
> > like two LPF Sallen-Keys in series, forming a 4-pole... can anyone  
> > point me to it?
> >
> > ...any other good Sallen-Key OTA-based examples out there? Maybe a  
> > Sallen-Key OTA actual bandpass filter?
> >
> > (there's pleanty of state variable examples, no problem there)
> >
> > For Sallen-Key vactrols, you of course can already guess what I'm  
> > going to use. ;)
> >
> > - Aaron
> >
> > ----------------------------------------------------------------------- 
> > ------
> >
> > Dr. Aaron Lanterman, Asst. Prof.       Voice:  404-385-2548
> > School of Electrical and Comp. Eng.    Fax:    404-894-8363
> > Georgia Institute of Technology        E-mail: lanterma at ece.gatech.edu
> > Mail Code 0250                         Web:     
> > users.ece.gatech.edu/~lanterma
> > Atlanta, GA 30332                      Office: GCATT 334B
> >
> >
> >
> -------------------------------------------------
> Yves Usson
> email :       yves.usson at yusynth.net
> web site :    http://yusynth.net
> 
> 
>