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World's Smallest Tesla Coil

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Calculated at checkout

Product Description

Generate Bolts of Lightning
Crashing Against the Inner Walls of a 5" Lamp!

Great for science fairs and small HV experiments, an attention-getting office or bar action decoration, a conversation piece, or other special effects prop. Produces an adjustable repetition of high voltage open-air spark discharges of up to several cm.

This item is assembled and ready to use.
It is also available as a kit with plans and all parts, requiring assembly.
Or as plans (paper or downloadable versions), with parts and assembly required.


Unit is built into a 3 x 2 x 1" plastic box and is powered by a three wire grounded line cord operating from 110 vac. As a safety measure the output winding is directly connected to the earth grounded green lead of the power cord. This prevents any accidental contact to the 115 vac that could occur by accident or by a circuit fault.

Power and repetition rate are controlled by a combination potentiometer and switch. Output voltage pulses are up to 40 kv at .2 Joules and can be adjusted from a slow to fast pulse rate. Sparks are very audible and visual for the small size of this unit.

Hazards: 115-vac line powered, requiring caution in assembling and testing. Output will produce moderate electric shocks but is not dangerous if assembly is correctly followed.

  • Generate Up To 40 KV Discharges
  • Experiment With HV Effects
  • Plasma In A Jar, St Elmo's Fire, Corona Etc.
  • Output Discharge Control
  • Small Size 3 in.x 2 in. x 1.5 in.
  • 115V Line Direct Operation

International customers using 220V wall power will require a stepdown transformer, like our TR220/110/50

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