Induction Coil, High Voltage, 80 mm Spark

This induction coil (Heinrich D. Ruhmkorff principle) supplies a pulse-shaped high voltage of approx. 50–80 kV AC or DC (selectable) with an input of 6–12 V DC. The principle is based on a step-up transformer comprised of a primary coil, up to a few hundred of turns, and a secondary coil, hundreds of thousands of turns, permanently sealed and embedded in polymer insulating layers. To operate the coil continually, a magnetically activated vibrating interrupter is incorporated. The use of a quenching capacitor in this coil’s design prevents arcing at the interrupter contacts and minimizes other undesirable effects affecting its performance.
A pair of point electrodes and a flat disc type are supplied with the instrument. Electrodes feature insulating acrylic handles for adjustment of the spark gap. The spark gap (tip to disc) is max. approx. 80 mm.

This induction coil can be used in a variety of physics experiments such as visualizing the electrostatic lines of force, powering spark-gap EMR transmitter demo, energizing spectrum tubes, Crookes tubes, and so on.

Can be used with a 6-12 V DC laboratory power supply or a battery pack. Note that operation with electronically stabilized power supplies is not recommended, as these could be damaged by the kickback pulse of the induction coil.

Dimensions (w × d × h): 30 × 10 × 20 cm. Weight: 3 kg.