delara news Delaware Amateur Radio Association, Delaware OH   VOL 37 NUMBER 6

Tech

Dan, KB6NU

I got this from the slowspeedwire Yahoo group: IEEE Spectrum published an article earlier this week that describes how the original flip-flop circuit was designed and built. According to the article, Re-creating the First Flip-Flop, the circuit was first invented in 1918 and used as a trigger relay for radio designs. An article in the December 1919 issue of The Radio Review popularized the circuit, which used two vacuum tubes!