After receiving a PhD from Yale in 1896 with a dissertation on radio waves, he developed an improved wireless telegraph receiver. By 1902, he had founded the De Forest Wireless Telegraph Company ...
In 1906 De Forest produced his Audion, reputedly the first triode, which was used as a detector, then an amplifier, and finally a transmitter. A better circuit was needed and in 1913 Armstrong ...
After receiving a PhD from Yale in 1896 with a dissertation on radio waves, he developed an improved wireless telegraph receiver. By 1902, he had founded the De Forest Wireless Telegraph Company ...