I am interested in playing around with this 4 way crossover from tubecad.com but I got stuck on a formula.
To calculate the parts values he gives the following formulas:
I get how to calculate the capacitor values. But what is the "q" looking symbol in the formulas for calculation of the inductor values?
Here is the whole article: https://www.tubecad.com/2017/11/blog0403.htm
Thanks!
To calculate the parts values he gives the following formulas:
I get how to calculate the capacitor values. But what is the "q" looking symbol in the formulas for calculation of the inductor values?
Here is the whole article: https://www.tubecad.com/2017/11/blog0403.htm
Thanks!
It must be a π that got distorted somehow.
The author treats the bandpass filters as cascaded first-order filters, and you always get factors of 2πf in the expressions for first-order filters. For some reason a numerical approximation 1000 000/(2π) ~= 159155 is used for the capacitances but not for the inductances.
The author treats the bandpass filters as cascaded first-order filters, and you always get factors of 2πf in the expressions for first-order filters. For some reason a numerical approximation 1000 000/(2π) ~= 159155 is used for the capacitances but not for the inductances.
