[sdiy] Ladder filters using different different filter topologies.

Ben Riggs benalog1977 at gmail.com
Wed May 6 13:07:00 CEST 2020


And I just realised I missed where Aaron pointed me to them last year.. sorry Aaron.

> On 6 May 2020, at 6:04 pm, Ben Riggs <benalog1977 at gmail.com> wrote:
> 
> Hi List,
> 
> Ive resurrected an old post of mine because I stumbled across the document I was looking for. Strange because I was searching for something unrelated and it popped up. It was actually linked on Donald Tillmans blog:
> http://www.till.com/blog/archives/2005/03/ladder_filter_v.html <http://www.till.com/blog/archives/2005/03/ladder_filter_v.html>
> 
> The actual one that I was looking for all those months ago was this one:
> http://www.pat2pdf.org/patents/pat6084470.pdf <http://www.pat2pdf.org/patents/pat6084470.pdf>
> 
> I actually built a circuit not too dissimilar to the Alisa-1337 that Sam HOSHUYAMA pointed me towards, and strangely enough is not too dissimilar to Fig.17 in the patent, except with a variable gain cell between the bases of the first filter stage. Mine had I bit more fruit though with 4Pole and VC resonance.
> 
> Ben.
> 
>> On 8 Feb 2019, at 3:25 pm, Ben Riggs <benalog1977 at gmail.com <mailto:benalog1977 at gmail.com>> wrote:
>> 
>> Hi SDIY Peeps,
>> 
>> The last week I’ve been musing about filter designs, and (by default) to solve the CV bleed through I keep thinking ladder design. Then I keep remembering a document that I can’t reference that had different filter topologies based about the ladder design.
>> 
>> Can anyone help finding the document?
>> 
>> Cheers,
>> Ben.
> 

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