This transistorized shift register was found in a 1970s RCA documentation. The used transistors can supply 27 V loads with a 3A current of 3 A.
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...