RLC filters. How to determine band pass filter?
A "parallel" band pass filter constructed from R,L and C has a centre frequency determined largely by the formula below: -

Fc = \$\dfrac{1}{2\pi\sqrt{LC}}\$

Given the following circuit: -



The impedance reaches a maximum at resonance and current I will only flow thru the resistor at resonance. Clearly, if R is big less current flows and if the frequency is moved away from Fc then the impedance drops rapidly. This type of circuit is used to let one frequency through (Fc) and rapidly attenuate frequencies that are not at resonance.

More typically the parallel RLC circuit looks like this (because it takes into account the biggest losses that tend to occur in the inductor): -



Now the frequency of resonance is slightly shifted from the previous formula to take into account R: -

Fc = \$\dfrac{1}{2\pi}\sqrt{\dfrac{1}{LC} - \dfrac{R^2}{L^2}}\$

The resistance in series with the coil (L) also reduces the Q of the circuit which makes the filter less peaky.

There is a lot more to these types of circuits and I'd take a look here - wiki page for RLC circuits (includes series RLC).