ERROR!!!! The correction is that whenever the capacitor is discharged, the current it at maximum. At 1:45, 2:37 and 2:49, I remove the arrows to indicate that the current is zero while the capacitor is discharged. I shouldn't have removed them. In fact the arrows are moving in the same direction before and after those points and the arrows are thickest, meaning maximum current! How can it possibly be maximum, then zero, then maximum?! My bad. It's shown better in the animations starting at 3:16.

How to select a coil and capacitor for an LC circuit, using a crystal radio as an example. This also shows about the resonance of the parallel LC circuit.

This video was made possible in part by these Patreon supporters:
Jonathan Rieke
Printable Science

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See also:

How to Design a Coil for Specific Inductance
   • How to Design a Coil for Specific Ind...  

How to Make Capacitors - Low Voltage Homemade/DIY Capacitors
   • How to Make Capacitors - Low Voltage ...  

How to Make/Build a Crystal Radio
   • How to Make/Build a Crystal Radio  

Webpage with inductance capacitor for designing coils:
http://rimstar.org/science_electronic...

Webpage with LC resonance calculators:
http://rimstar.org/science_electronic...

Where to buy a variable capacitor:
http://www.midnightscience.com
http://www.scitoyscatalog.com/categor... (their variable capacitor is 0 to 160pF and is for if your coil has a ferrite core and is smaller than the one in this video)

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A Darker Heart - music by audionautix.com