Found in Ferranti's 1969 documentation this circuit has a maximum operating frequency of 7.5 MHz. The circuit can be designed with modern transistors.
The purpose of this circuit, found in a documentation for radio amateurs in 1974, is to amplify noise...
Found in an Elektor from the 90s, this circuit simulates a rotary switch that provides a BCD...
Found in a 1970 American publication, this circuit uses transistors of the time. These transistors...