# [TCML] Dr. Resonance inductors

Jim Mora wavetuner at gmail.com
Fri Mar 6 17:11:19 MST 2009

```Hi Jim,

I ran the online air core inductor calculator for 12" diameter 12" long.
Here's the output for a 1H choke and #24 wire:

Turns=2190
Turns per layer= 563.4
Number of layers=3.89
Outer diameter=12.17 (reasonable)
Wire Length=6916 Feet

Lets try a 24" long x 12 diameter:

Turns=2852
Per layer=1126
# of layers=2.53
Outer dia=12.13
Length=8985ft
DC ohms=231

Hmm,, lets up the diameter to 18" @ 12" long

Turns=1574
/layer=563
Outer dia=18.13
Length=7434ft
191 ohm dc

That still will make a big Marx generator! The geometry would probably want
to be more like 24" long so it could be angled up. 10 stages would be
probably be >20feet high.

This seems reasonable I guess for a DC charging inductor if the layers are
covered in Kapton tape over hanging the ends and it is polyamide or equiv
insulated magnet wire. I tried designing this before and failed. This seems
doable! Back to Richie's site!!

BTW, I have come up with a very cool water resistor I'll share on a separate
post.
Jim Mora

-----Original Message-----
From: tesla-bounces at pupman.com [mailto:tesla-bounces at pupman.com] On Behalf
Of jimlux
Sent: Thursday, March 05, 2009 8:49 PM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Dr. Resonance inductors

Lau, Gary wrote:
> Assuming a single-layer close-wound air core solenoid made from 30AWG
> magnet wire, a 1H inductor would be huge!  12.33" diameter x 36"
> long.

But I'll bet if you made it 12" in diameter, and 12" long, with 3
layers, it would be a lot higher inductance.. maybe as much as 9 times
higher.

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```