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500,000 Volt Medium Power Table Top Tesla Coil (Paper Plans)

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Product Description



Intended for Special Display Experiments

Produces Intense 18 to 30" Discharges at 500,000 Volts!

This is a spark driven Tesla coil generating very visual and audible sparks into open air without a return contact. It operates from a standard 115V wall outlet requiring less than six amps.

Paper plans: 28 pages with schematics and color photos (also available as downloadable plans for roughly half the price.


This Tesla coil can be operated on a tabletop. It is built as a two-level assembly consisting of a top and bottom section. The top supports the vertical mounted secondary output coil and the flat Archimedean spiraled primary along with a tunable clip lead. The bottom supports the transformers, capacitor and spark gap assembly attached by machine screws and nuts.

A metal control panel is connected to earth ground along with the secondary output coil return, reducing line voltage shock hazards. The spark gap is air cooled with a high output muffin fan and uses three pure tungsten electrodes rarely requiring cleaning or dressing. Hardware is all brass where required with the primary coil being all copper tubing.

The kit contains a pre-wound and fully prepared secondary coil and all parts to complete the unit, including a 12 x 3 inch toroidal terminal which greatly adds to the performance and overall appearance of the completed system.

Our BTC40 used in laser guiding of HV discharge, photo complements of the Optical Society of America (© 2012 OSA, Optics Express Vol. 20 No. 12):


Power enough for most R&D experiments. Kit and assembled units include wound coil (so you don't have to do the winding), multi-section spark gap, and 12" toroid terminal. Individual parts also available.

Assembly: Mostly mechanical assembly with some soldering

Applications: Use as a science project, museum display, special effects prop, and for electrical research of high frequency electricity.

  • Air-Cooled Tungsten Spark Gap
  • Choice of 115/220 Operation
  • Parts Individually Available
  • Size: 30" high x 16" sq. base, 45 pounds weight

Attention Museums!

This Tesla coil is built using transparent polycarbonate to reveal the inner wiring. This is truly a spectacular looking device!

TR220/110/1500 - Optional 220V 1500W Stepdown Transformer for overseas customers

Please note that the BTC40 is a heavy/bulky item and shipping may exceed the amount shown -- we will notify you of the exact amount & get your confirmation before we ship your order.

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