# L-C Filter
Equations

This
page contains the basic equations for an L-C filter. The filter is comprised of
the inductor (L) and capacitor (C). A web calculator is provided so you can
compute the cut-off frequency and characteristic impedance of your own filter.

## Cut-Off
Frequency

F
= 1/(2*PI()*SQRT(L*C))

## Characteristic
Impedance

Z
= SQRT(L/C)

## Web Calculator

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Written 11/14/05

Last updated 6/20/06