Make: Volume 44

Plasma Arc Speaker

Written by John Iovine

Create a high-voltage loudspeaker that makes sound waves by vibrating an electric arc

Hep Svadja

JOHN IOVINE is a science and electronics tinkerer and author who owns and operates Images SI Inc., a small science company. He resides in Staten Island, N. Y., with his wife and two children, their dog. Chansey, and their cat, Squeaks.

WHAT DO THE WORLD’S MOST EXPENSIVE SPEAKERS, THE SUN, AND LAMPS FROM THE 1890S HAVE IN COMMON? Plasma, the fourth state of matter, of course! After building this little plasma ...