Found in a 1968 EEE, this circuit uses transistors from that time. The output is 300 ns. Transistors can be replaced with modern equivalents.
This simple metronome, from 1985 documentation uses only transistors and has two settings. For...
This circuit is suitable for modulating AM transmitters. The circuit is from a 1977 radio amateur...
This flasher was found in an old Hands On, but uses common components. The optocoupler can be...