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.
Found in a 1968 Mullard manual, this circuit measures temperature by infrared radiation. The...
Found in a 1970s RCA documentation, this circuit generates signals according to the component...
This Harris circuit from the 90's is intended for recording old EPROM memories. The circuit uses...