How to design a coil for a specific inductance that you need, including how to calculate the inductance and where to find an online inductance calculator. This goes through all the parameters: number of turns, area, length and relative permeability as well as mentioning some other factors like capacitance, frequency and coupling.
The webpage with the inductance calculator is here:
http://rimstar.org/science_electronics_projects/coil_design_inductance.htm
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James Padden
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See also:
How to Make Capacitors - Low Voltage Homemade/DIY Capacitors
https://www.youtube.com/watch?v=GveI9gXIsHw&list=PLFsZmHTZL-zmfXxstlxuJgRE9bOGobEVu
How to Make Tesla Coil - Small Spark Gap Tesla Coil
https://www.youtube.com/watch?v=0SaEPW_iMF8&list=PLFsZmHTZL-zmfXxstlxuJgRE9bOGobEVu
How to Make/Build a Crystal Radio
https://www.youtube.com/watch?v=VqdcU9ULAlA&list=PLFsZmHTZL-zlSltC6ELZW9PK4ks7wgPRz
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