[sdiy] Other resonator designs

[David G. Dixon]

> If you do build the triple wilson SVF, you might want to do a
> schematic/PCB for all three filters on one board, rather than use
> three MFOS boards. The MFOS SVF design uses 2 LM13700's, but half of
> one of them isn't used, which makes three wasted VCAs in total.

Of course, Tom, that goes without saying!  ;-)

(Perhaps you haven't seen any of my layouts, but I tend to get very upset if
there is more than a square centimeter or so of board space wasted -- I take
it as a personal challenge to stuff as many components onto as small a board
space as possible (e.g., my Dual Irwin-Gallo 2164-VCA board is 2.1" x 4.4",
and my Triple Wilson LFO board is 2.1" x 5.3"), and I never leave a spare
opamp or OTA unused.  Plus, I have vowed never to buy a board -- it's
strictly homebrew PCBs for me!)