Found in American documentation this circuit uses transistors of the time. The circuit can be made with current components. It works as a trigger working with 600 ohm signals.
This circuit was found in Motorola documentation from the 1980s. PUTs are not common components...
Found in an Electronic Design from the 90s, this circuit does not need sinks for its components. The...
This low-noise circuit was obtained in a 1969 British documentation. The circuit uses components...