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Crystal Radio Web Site

Single Layer Air Coil Inductance Calculator
d = Coil diameter (in), n = Number of turns, l = Coil length (in)

Solve 
 Vary Low - High
Coil Diameter (d)
Number of turns (n)
Coil Length (l)
     
Inductance 

Estimated Wire Turns:
(per inch)
(per cm) 		    

Notes:
1) For broadcast band you want inductance between 250uH and 300uH (280uH)
2) This calculator will get you close and is not intended as a final formula
Crystal Radio




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Original Calculator written by Ralph Reiter
Use granted by Ralph Reiter on a "as-is" basis
Altered with permission by Darryl Boyd
Copyrighted  March, 2001 by Darryl Boyd