Inductors, capacitors and tuned circuits
You pretty much don't have radio without inductors, capacitors and the tuned circuits they form when connected.
Demonstrating Capacitance, Inductance, Reactance and Frequency
Lower capacitance from a two gang variable capacitor
What to do if they stop making variable capacitors
Calculate tuned circuit values in your head
The best way to connect a trimmer capacitor in an RF circuit
Testing a parallel tuned circuit
Two tricks with tuned circuits
Experiments with a biscuit tin cavity filter for UHF
Testing materials for RF properties with a simple receiver
You can learn more about inductors, capacitors and tuned circuits via the following references:
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