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Energy

Trombly-Kahn Toroidal Converter

Closed-path toroidal coil exhibiting anomalous EM induction

$165 plan
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// Blueprint rendering available after purchase
Technical Specifications
Classification Scalar EM — Energy
Topology Closed toroidal winding
Core Silicon steel toroid or air core
Mechanism Curl-free vector potential (A-field)
Drive Variable speed rotary actuator
Shielding mu-metal + Faraday enclosure
Difficulty 3 / 5
Est. Build Cost $350–$750
Est. Build Time 4–7 weeks

Overview

The Trombly-Kahn device is based on Adam Trombly's work with a toroidal conductor topology where the coil path is entirely closed within a torus — conventional EM theory predicts zero flux linkage and zero output. Trombly and Kahn documented measurable current output in such geometries, attributed to the curl-free but non-zero vector potential (A-field) acting on conduction electrons in the conductor. This effect is related to the Aharonov-Bohm phenomenon. The build plan covers precision toroidal winding, shielding requirements, measurement methodology to isolate stray induction artifacts, and the specific rotational drive geometry used in Trombly's later demonstrations. Careful construction and rigorous measurement control are essential; stray flux pickup is the most common false-positive failure mode.

Intended Research Use

Curl-free A-field experiments, Aharonov-Bohm analog studies, closed-path EMF anomalies, homopolar generator variants.

Bill of Materials (16 components)

#Component
01 Silicon steel toroidal core, 150mm OD (×2)
02 26 AWG magnet wire, 250m spool
03 Mu-metal shielding foil, 300×300mm (×3 sheets)
04 Variable speed motor (DC, 0–3000 RPM)
05 Optical encoder (RPM measurement)
06 High-impedance voltmeter (>10MΩ input)
07 Lock-in amplifier or low-noise preamp
08 Copper grounding strap
09 Precision rotary bearing assembly
10 Faraday cage enclosure
11 Oscilloscope (low-noise, 100MHz)
12 FFT analysis software
13 BNC shielded cables, 1m (×6)
14 Phenolic standoffs and mounts
15 24V DC motor controller
16 Precision LCR meter

Get Build Plan

Complete plan PDF including all specs, winding geometry, drive circuit schematics, measurement protocols, and Gerber files where applicable.

$165 one-time
Purchase plan — Stripe
Also available: Component kit $680 — members get 10% off
Save 10% with Membership
Complete build documentation (PDF)
Winding specs + circuit schematics
Measurement + verification protocols
Sourcing guide for all BOM items
Lifetime access, no subscription
Build Difficulty
Intermediate — requires basic RF electronics experience.

Est. cost: $350–$750
Est. time: 4–7 weeks