Steiner Filter - Simultaneous Outs

logicgate · Joined: Mar 02, 2013 Posts: 11 Location: brazil

I wanted to build a version of this filter but with LP/BP/HP simultaneous outputs.

I reckon I only need to triplicate the core?

Are the numbers in red (image attached) correctly corresponding to the 3P4T switch lugs???

Thanks!

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wackelpeter · Posted: Thu Sep 25, 2014 7:29 am Post subject:

maybe you want to Combine Yves' design with one of Ken Stone's version of the Steiner Filter...
Ken Stone built it with 3 different input stages hp,lp,bp and an input where the signal is spread to all 3 filter sections... then you can mix the signals into each filter section and select how much of the signal is applied to each section and at the Output you have a mix of all the Signal fed into the filter...
you can also feed different signals into the filter at once...
is it that what you're looking for?

yusynth · Joined: Nov 24, 2005 Posts: 1314 Location: France

A Steiner VCF which is based on a Sallen and Key architecture in which you can only have separate LP,HP,BP inputs for a single output.
If you are looking for a filter with a single input point and three distinct outputs which are LP, BP and HP respectively then you must pick a completely different filter architecture such as a State Variable filter (Oberheim SEM filter, Elektor formant 12dB VCF etc…)

If you triplicate the core then yes it can be done but it is a very complicated way compared to the SVF architecture.