> It does not increase the storage of the filter capacitor

I see how that works

My first thought when I saw the circuit was "gyrator"

I remember once reading in a circuit description of a graphic
equaliser that the effects of small capacitors were being "multiplied"
to simulate inductors, which had at one time been common in such
circuits. Even in the 70's I had several schematics using quite bulky
inductors in active filters. The gyrator op-amp design I did and do
use is much smaller and cheaper

It seems though that "gyrator" is not truly capacitance multiplication
but might be confused with such in some applications

http://en.wikipedia.org/wiki/Gyrator

Joe


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