[sdiy] Wanted: non mathematical description of the functionof RC-filters

[David G Dixon]

> I like the second example, but the first is problematic. The 
> implication when an analogy is made between a sieve and an 
> audio filter is that there is a binary relationship. With a 
> sieve, either a particle fits through the holes or it 
> doesn't. With an audio filter, it's not so black and white. 
> Filters have a slope, and this allows frequencies from input 
> to appear on the output at reduced amplitudes.

Yes, I was thinking the same thing (and mineral processing is one of my
professional concerns).

All this just reinforces the opinion I expressed earlier: electronics is
math, and trying to deny it just causes more complications.  RC filters
don't behave like sieves; they behave more or less exactly as predicted by
current nodal balances.  Why not just use that the mathematical equation
itself as the analogy.