# How do you calculate the value of the inductor and capacitor in a parallel LC circuit?

There is a parallel LC circuit with unknown values for the inductor and the capacitor. How exactly can I identify the value of the inductor and capacitor?

I know I can apply an sinusoidal function to the circuit and calculate the product of LC by identifying the resonance frequency. However I cannot figure out how exactly one could identify the value of the individual components in the parallel LC circuit. I can only use an oscilloscope and a signal generator.

Note: I cannot remove any components from the LC circuit as it is in a "black-box."

• asdf_man: If all that's in the black box is the parallel LC circuit, then connecting a capacitor across the two wires going into/coming out of the black box is equivalent to connecting the capacitor in parallel with the LC circuit. – EM Fields May 21 '14 at 19:06

4. ${f_2 \over f_1} = \sqrt{ C \over {C + C_x}}$. The only unknown in this is C. You can calculate it.