Uploaded April 2017 | Updated September 2026, 3 weeks ago
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
Support RimstarOrg on Patreon patreon.com/user?u=680159
or make a one-time donation at rimstar.org/donate_support_rimstarorg.htm
Subscribe so that you don't miss new videos as they come out youtube.com/user/rimstarorg?sub_confirmation=1
Go to the main channel page here youtube.com/rimstarorg
See also:
How to Design a Coil for Specific Inductance
youtube.com/watch?v=awyLYgu6ODM&list=PLFsZmHTZL-zmfXxstlxuJgRE9bOGobEVu
How to Make Capacitors - Low Voltage Homemade/DIY Capacitors
youtube.com/watch?v=GveI9gXIsHw&list=PLFsZmHTZL-zmfXxstlxuJgRE9bOGobEVu
How to Make/Build a Crystal Radio
youtube.com/watch?v=VqdcU9ULAlA&list=PLFsZmHTZL-zlSltC6ELZW9PK4ks7wgPRz
Webpage with inductance capacitor for designing coils:
rimstar.org/science_electronics_projects/coil_design_inductance.htm
Webpage with LC resonance calculators:
rimstar.org/science_electronics_projects/lc_circuit_aka_tank_or_resonant_circuit.htm
Where to buy a variable capacitor:
Sorry. The links I had no longer work. If you have any good suggestions then let me know in the comments and I'll put them here.
The following one's store has said it's down for maintenance for a while now but maybe keep trying.
scitoyscatalog.com/category/R.html (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)
Follow behind-the-scenes on:
Twitter twitter.com/#!/RimStarz
Google+ plus.google.com/116395125136223897621
Facebook facebook.com/rimstarorg
rimstar.org
A Darker Heart - music by audionautix.com
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
Support RimstarOrg on Patreon patreon.com/user?u=680159
or make a one-time donation at rimstar.org/donate_support_rimstarorg.htm
Subscribe so that you don't miss new videos as they come out youtube.com/user/rimstarorg?sub_confirmation=1
Go to the main channel page here youtube.com/rimstarorg
See also:
How to Design a Coil for Specific Inductance
youtube.com/watch?v=awyLYgu6ODM&list=PLFsZmHTZL-zmfXxstlxuJgRE9bOGobEVu
How to Make Capacitors - Low Voltage Homemade/DIY Capacitors
youtube.com/watch?v=GveI9gXIsHw&list=PLFsZmHTZL-zmfXxstlxuJgRE9bOGobEVu
How to Make/Build a Crystal Radio
youtube.com/watch?v=VqdcU9ULAlA&list=PLFsZmHTZL-zlSltC6ELZW9PK4ks7wgPRz
Webpage with inductance capacitor for designing coils:
rimstar.org/science_electronics_projects/coil_design_inductance.htm
Webpage with LC resonance calculators:
rimstar.org/science_electronics_projects/lc_circuit_aka_tank_or_resonant_circuit.htm
Where to buy a variable capacitor:
Sorry. The links I had no longer work. If you have any good suggestions then let me know in the comments and I'll put them here.
The following one's store has said it's down for maintenance for a while now but maybe keep trying.
scitoyscatalog.com/category/R.html (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)
Follow behind-the-scenes on:
Twitter twitter.com/#!/RimStarz
Google+ plus.google.com/116395125136223897621
Facebook facebook.com/rimstarorg
rimstar.org
A Darker Heart - music by audionautix.com
