Found in ancient documentation, this circuit uses a high voltage transistor of the time. Observe the supply voltage of the neon lamp used.
This circuit was found in an Elektor from the 90s. The circuit uses common components even today,...
This useful instrument has dual function, operating both as signal injector and continuity tester. The...
This circuit was found in a 1962 publication. At the time there were high voltage batteries like the...