This flip-flop with neon lamps was found in a 1969 publication that deals precisely with neon lamps. Observe the high supply voltage.
We found this shield circuit in the SGS Integrated Circuits Manual of 1982. The circuit is...
This circuit with transistors and a crystal microphone appeared in Radio Electronics magazine in...
This circuit amplifies the signals in the UHF band starting at 470 MHz, reaching just over 900...