[sdiy] SSM2040 Filter Bank

[Scott Bernardi]

I was playing with the idea of filter banks too, and did some design work. The idea
was to hook them up like "parametric filters" - where the filter response could be
added or subtracted from the input (boost/cut). I've got a control structure where you
can have a master frequency adjust & CV (that all channels track), plus each
individual channel independently.
I haven't built it yet, but you can look at the design on
http://home.attbi.com/~sbernardi/elec/og2/og3_filterbank.html

Keith Winstanley wrote:

> Hi all,
>
> I have just got hold of a bank of four Digisound State Variable
> Filters each using the SSM2040 and giving me 12/24db lowpass and highpass
> 2nd and 4th order bandpass and notch filtering via a selector.
> Two of the SSMs have been stripped out and TBH the panel is a bit of a mess;
> sticky labels and Letraset covered in very crinkly sticky back plastic,
> most of the knobs have gone.
>
> I am going to renovate using new pots and presets with Schaeffer panels and
> I am trying to decide whether to built it back as a four filter bank or whether
> tomake up to four separate modules. Building a bank would mean buying two
> more ssm2040s or I could stick to two separate modules.
>
> Are there any advantages keeping the filters as a bank of filters and does anyone-
>
> know of any interesting configuration I could include or do I keep fully modular?-
>
> Maybe some sort of switch to sync all filter responses???
>
> I am not decided what I want to do so I thought I would see if anyone have any
> useful ideas/opinions/suggestions??
>
> regards...
>
> Keith
>
> http://home.freeuk.net/lowpass

--
Scott Bernardi
sbernardi at attbi.com