[sdiy] Compact VCF

[rdrake]

a second vote for Ken's version of the steiner-parker:

http://www.cgs.synth.net/
http://www.cgs.synth.net/modules/cgs35_syntha_vcf.html

this is one of my all-time favorite modules.

the e4m documents are still available, tho:

http://www.ele4music.com/projects.html


The Steiner-Parker filter (Ken Stone makes a CGS clone) 
would be a good choice... His design crushed the circuit 
onto a very small board. 

I'd suggest the VCF1e design from Tom Gamble's EFM 
(Electronics for Music) however I think all the 
schematics may have been removed from the site (the 
modules are discontinued so check for yourself). =20 
This design was based on the National Semiconductor 
datasheet for the LM13600 / 13700 example of a lowpass 
VCF. =20 

If you use a resonance pot instead of voltage 
control... 
this VCF could be done with a single LM13600 package 
and maybe two transistors. 

It would not track a keyboard CV as is, but otherwise 
would satisfy all VCF functions nicely. 

H^) harry 



--- Karl Ekdahl <_nial_ at yahoo.com> wrote: 
> Hi all. 
>=20 
> I'm currently building on a portable synthesizer and 
> i 
> need a *small* VCF to fit in. Since i've got a zero 
> budget (mark my words), i'd like something based 
> around ordinary parts and possibly one or two 
> CA3080's. I don't need anything fancy, just a 
> regular 
> lowpass with resonance and cutoff. The best 
> alternative i've found so far is Ren=E9 Schmitz MS20 
> clone, any other suggestions? 
>=20 
> Thanks 
>=20 
> Karl 
>=20 
> H=F6strusk och gr=E5 moln - k=F6p en resa till solen p=E5 
> Yahoo! Resor p=E5 adressen 
http://se.docs.yahoo.com/travel/index.html 

 
 

 

>----- ------- Original Message ------- -----
>From: harrybissell at prodigy.net
>To: _nial_ at yahoo.com, synth-diy at dropmix.xs4all.nl
>Sent: Mon, 1 Mar 2004 -0800 (PST) 08:59:06
>