Lee de Forest (1873-1961)


Electronics changed this world. How much? You should be able to figure out. Do you know who invented electronics? This question is the same as who Lee de Forest was. He was born six years before Einstein and died six years after Einstein. Who then changed this world more profoundly?

It was known before 1900 that electric current flows from anode to cathode in a vacuum tube if the cathode is heated. In 1906, de Forest put a grid between them and found out the grid voltage can change the current. This device could amplify weak signals and opened the way for electronics. You may be interested to know how this discovery led to present-day consumer electronics. Click here for a story.

Y. S. Kim (2006.4.12)
copyright@2006 by Y. S. Kim, unless otherwise specified.