Math expression for parametric EQ project

[Cosmic Antagonist]

Hi all,

I would like to build a clone of UREI 545 or 546 parametric EQ but with another bands. Therefore I looking for math expressions to modify the Q, and the frequencies. Maybe I can get help here.Thanks
Leslie

 

[Cosmic Antagonist]

Maybe the schematic help:
Urei 545 Parametric Equalizer Schematic

546 not exactly same:
http://www.jblproservice.com/pdf/Vintage%20JBL-UREI%20Electronics/UREI-546.pdf

I would like to build 6-10 band parametric EQ instead of 4 band like original UREI.