This good power amplifier, a few tens of watts, is part of an article in the December 1972 Radio Electronics magazine. The power supply must be symmetrical with at least 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...