This flip-flop with neon lamps was found in a 1969 publication that deals precisely with neon lamps. Observe the high supply voltage.
This stereo preamp uses only two germanium transistors. The circuit was found in old documentation using...
When the fuse blows, the neon lamp flashes at a frequency determined by the capacitor. This...
Using an operational amplifier at the time, this circuit was found in documentation from the...