This meter has a 0.001% tolerance and was found in an old American publication. The circuit has a selectable output.
This flip-flop with neon lamps was found in a 1969 publication that deals precisely with neon...
We found this circuit in April 1979 Radio Electronics magazine. The circuit is based on the 555...
This 1968 Hughes circuit uses period components and operates at 8 Hz. Current equivalent...