Published with a power amplifier in the January 1985 issue of Radio Electronics, this circuit indicates overexcitation by a strong signal that causes distortion.
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...