This circuit was published in Radio Electronics magazine in June 1959. The circuit uses an inverter with transformer to generate the high voltage of the Geiger tube.
Found in a 90’s Popular Electronics, this circuit uses a component that can be difficult to obtain...
This VCO makes use of components from the 1980s. The circuit can be implemented with modern...
This circuit is intended to measure the Idss current of a junction FET under test. The limiting...