This circuit was found in a 1967 EEE. The components are from that time, but the circuit can be implemented with modern equivalent components.
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...