[sdiy] Sallen Key with input mixing to generate all shapes

Andrew Simper andy at cytomic.com
Mon Dec 22 04:31:11 CET 2014

On 22 December 2014 at 10:53, Tim Parkhurst <tim.parkhurst at gmail.com> wrote:
> Ken Stone's take on the Steiner-Parker Synthacon filter does this too.
> http://www.cgs.synth.net/modules/cgs35_syntha_vcf.html
> Cheers,
> Tim (and a notch filter in a pear treeeeeeee) Servo
> ---
> "Sire, the church of God is an anvil that has worn out many hammers." - H.L. Hastings

Tim, this isn't the same thing, this is the regular MS20 type mixing
so you only get a one pole high pass this way, and no notch / peak are
possible from summing and differencing the low and high pass. The
system I've outlined allows for all the same responses and summings
you can do with an SVF.


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