This flip-flop with neon lamps was found in a 1969 publication that deals precisely with neon lamps. Observe the high supply voltage.
This very simple oscillator, with only one transistor, was found in a Japanese magazine in 1967....
This simple circuit can use any general-purpose transistor. The power supply must be isolated. The circuit...
The integrated circuit used in this application is uncommon today. The circuit converts...