[TowerTalk] OT: Inductor Calculator

[jimlux]

On 2/26/19 9:06 PM, Gedas wrote:
> Once upon a time I found a site that had an awesome online calculator 
> for calculating the inductance of single layer coils where you could 
> specify an insulated wire like #14 THHN along with coil dia, length, etc.
> 
> Does anyone have a URL for that or something similar? TU !
> 


Wheeler formula:

L(uH)  = R^2  * N^2 / (9 * R + 10 * L)

R = coil radius in inches
L = coil length in inches
N = number of turns

Wire gauge and insulation do not change the inductance very much. 
Insulation, in particular will change the self C and the self resonant 
frequency.