[TCML] Dr. Resonance inductors - 1/16th of an inch?

[David Dean]

Hi Stephen

Can you tell me where that formula came from? I had not seen that one before. 
Also you say  d is coil diameter in inches, is that mean diameter or total 
diameter?

later
deano

On Friday 06 March 2009 03:02:00 am Stephen Hiscock wrote:
> I believe inductance is calculated by
> L= (d^2 * n^2)/(18*d+40*l)  (MicroHenries)
> where:
> L is inductance in micro Henrys,
> d is coil diameter in inches,
> l  is coil length in inches, and
> n is number of turns.