[sdiy] SSM chip reissue

[Jay Schwichtenberg]

Tom,

 

Good question on the 2164.

 

I really haven't explored it in detail yet. I've seen LPF, SVF and Obie
Xpander filter topologies out there. Heard of all-pass topologies but
haven't looked at them yet. Haven't heard about any high pass filters yet.
Just need time to sit down with some books and do some math to figure it
out.

 

Thanks

Jay S.

 

From: Tom Wiltshire [mailto:tom at electricdruid.net] 
Sent: Sunday, April 23, 2017 11:53 AM
To: Jay Schwichtenberg
Cc: synth-diy at synth-diy.org
Subject: Re: [sdiy] SSM chip reissue

 

SSM2044 is designed as a lowpass-only chip, yes.

 

That's not to say you couldn't start tapping differential signals from the
caps and build a pole-mixing filter with it like Oberheim did with the
CEM3372 (also "lowpass only") but it would use a lot of parts and it's much
easier to start with something like the SSM2164 if that's the purpose.

 

Talking of which, why not use the 2164 instead of the CA3280? You can use it
for filters, VCAs, and VCOs, and it's got the exponential reposnse built in,
unlike the CA3280.

 

Tom

 

On 23 Apr 2017, at 19:17, "Jay Schwichtenberg" <jschwich53 at comcast.net>
wrote:





I'm not familiar with the original chip and from the data sheet they only
show a low pass implementation. Does this chip only support low pass?

 

If people are doing old chips I'd like to see a super CA3280 made. You can
use CA3280s for filters, vcas and vcos verses having special chips for those
functions.

 

Jay S.

 

From: Synth-diy [mailto:synth- <mailto:diy-bounces at synth-diy.org>
diy-bounces at synth-diy.org] On Behalf Of Justin Herrmann
Sent: Saturday, April 22, 2017 10:06 PM
To:  <mailto:synth-diy at synth-diy.org> synth-diy at synth-diy.org
Subject: [sdiy] SSM chip reissue

 

Apparently some SSM chips are going to be released, new and improved, so to
speak:
<http://www.matrixsynth.com/2017/04/ssm-chip-production-to-return-as-ssi.htm
l?m=1>
http://www.matrixsynth.com/2017/04/ssm-chip-production-to-return-as-ssi.html
?m=1

Justin

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