Tapped 4pole Filter

[Harry Bissell]

Thanks for the schematic. This is exactly what I tried to simulate on
Electronics Workbench. My results showed that changing the resonant feedback
point didn't work. As you move to lower rungs (6-12db) the cutoff frequency
changes (higher) and the amount of resonance becomes less (and at a higher
frequency)  I kept the resonant feedback from the 4th stage, and used a second
diff-amp to "tap" the filter. This works well. Did anyone ever build this
filter as posted? I'd like to find out if my simulation agrees with reality
(often not the case...) I'll post my 3320 tapped filter later... for a Pro-One
its a really simple mod.  :-) Harry

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