[sdiy] Filters

[harrybissell]

well hate to stick my big nose in there but...

You can get NJM13600 and NJM13700 from Mouser

You can substitute the 3080 for the 13600 or 13700... as long as the design
does
not use the Diode Bias inputs... or use the darlington buffers. In Ray's
design he
did not use either.

The 13600 and 13700 are interchangable IF you don't use the internal
buffers... even if you
DID they are still pin compatible and may indeed work just fine.

The CA3280 is prlly the best OTA available... it has the Diode Bias input
but no onboard
buffers... it is expensive ($3-5) and harder to find.

Enjoy.

H^) harry

David Reichert wrote:

> 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./
> >