[sdiy] Filters

[David Reichert]

Ray,

I'd like to build a circuit something like this but I'm finding the
LM13700s hard to source. Do you perhaps know of a reliable source?

Would I be correct in assuming that replacing these ICs with CA3080s and
using simple Op-Amp buffers would be a futile idea?

Thanks,
Dave

-----Original Message-----
From: owner-synth-diy at dropmix.xs4all.nl
[mailto:owner-synth-diy at dropmix.xs4all.nl] On Behalf Of Ray Wilson
Sent: December 31, 2003 10:30 AM
To: The D.U.G.; synth-diy at dropmix.xs4all.nl
Subject: Re: [sdiy] Filters

Here is a good general purpose filter:

http://www.musicfromouterspace.com/analogsynth/statevariablefilter.html

Cheers

Ray


----- Original Message ----- 
From: "The D.U.G." <dug at dugdesign.com>
To: <synth-diy at dropmix.xs4all.nl>
Sent: Tuesday, December 30, 2003 8:05 AM
Subject: [sdiy] Filters


> Can anybody recommend some good sounding easy to build filters for
> beginners. Either something that has a pcb or is easy to P2P.
>
> I like the Sherman filter bank and the moog filters but I know there
are
> prolly kind complex.
>
> I found the EFM stuff and they seem cheap but nobody ever responded to
me.
>
> d./
>