This circuit uses a contactor having been found in a 1987 publication. More modern equivalent devices may be used. The circuit has neon indicator lamps.
This circuit from an 80's publication also features low input capacitance. FET can be a modern...
This circuit was obtained from an American documentation from the 1980s. The T1 triggering...
The integrated circuit used in this project is not common today, but it can be implemented with more...