This noise generator for the audio band was found in a British publication from the 1970s. The circuit can be implemented with modern equivalent transistors.
This thermostat was found in a 1997 publication. It can be powered by 6 V with the use of a...
This switched-mode circuit was found in the April 1976 issue of Radio Electronics magazine. The...
This circuit was obtained from an old American publication. Transistors are germanium types of the...