This circuit is from a Radio Electronics from April 1964. The circuit uses power transistors of the time, which must be mounted on a good heat radiator. Modern equivalents can be used.
This fiber optic receiver was obtained from a 1978 documentation. We can use any modern...
This IR light sensor circuit was found in the July 1992 issue of Radio Electronics magazine. It is...
This simple oscillator with just one transistor has a frequency determined by the characteristics of the...