Analog filters, whether active or passive, always follow a standard transfer function, normally in the complex s-domain alias LaPlace notation.

I was not able to find a comprehensive list of all the general transfer functions, so I decided to create one myself.

I offer it here for you to use as you wish in your personal work and designs, or to pin it on the wall, or...

If you want to use the equations in your own document, each one is available in .odf format (open document formula). PM me.

I appreciate feedback, I've carefully checked the equations for errors, but many eyes see better than just two.

**UPDATE 2:**

The PDF has been updated and now includes band-pass and band-stop functions as well (peak/notch only).

A new spreadsheet is included (.ZIP) if you want to play with second-order gain, cutoff frequency, damping ratio etc.

Cheers.