The following contains major spoilers for Transformers #12, on sale now from Skybound Entertainment/Image Comics.

After some testing, the rewound transformer was fitted back into the Royer circuit and with a few modifications the arc was struck. It’s not a finished project yet, and we’re looking forward ...

[Keystone Science] explains how to build one using a flyback transformer from an old CRT ... when HV is applied to the electrodes, an arc is established at the bottom, where they are nearest ...