Despite being found in a 1980 publication, this circuit uses components that can still be found easily. The circuit feeds an array of LEDs that run randomly, stopping at one.
This simple continuity tester consists of an oscillator found in the 1983 Electronics Experimenter Special...
This circuit was found in Radio Electronics magazine from October 1964. The circuit uses two...
This single integrated circuit receiver was found in the 1992 edition of the Electronics...