[TowerTalk] Fwd: Inductor Design and Voltage Breakdown

[Jim Brown]

On Fri,7/31/2015 6:15 AM, Jim Lux wrote:
> A quick run through Wheeler's equation says that a 3" diameter coil 2" 
> long with 18 turns (basically closewound) will be 21.8 uH
> [L (mh) = (R^2 x N^2) / 9R + 10B] 

Thanks, Jim. All comments appreciated. Do you know of any good 
calculators online that run through the equations for single layer coils 
like this?  N6BV pointed me to http://www.zerobeat.net/G4FGQ/ which 
yielded a DOS program called SOLNOID3.EXE that computes things like 
self-resonance, dissipation, and so on. I had to resurrect an old 
computer to run it. Many years ago, I wrote a QPro calc for the classic 
equations in the Handbook, which I found to correlate nicely with what I 
built.

73, Jim