RG's Parametric EQ Article

[aziltz]

Has anyone worked through the math on this one?  http://www.geofex.com/article_folders/eqs/paramet.htm#variable_l

RG is saying that 0.15u for C1 and 0.02u for C2 will give you a range of 100Hz to 450Hz.

I'm off by 3 orders of magnitude.  I'm getting 100k-450k...  Just from calculating the gyrator inductance and then the center frequencies.



I'm trying to design a 5-Band Parametric EQ.  I know what frequencies I kinda want, and I'm trying to match it up with common capacitor values.

[aziltz]

NVM, I've figured it out.


Not all the equations for the center frequency on that page have the SQRT(LC) in them.  Some are label only LC and I was using that.


RG, you might want to quick-edit that at some point.