This circuit, found in a 1958 magazine, is for reference only, since the components are not easy to find today. The transistors are germanium types and power supply is made by common cells.
This circuit is from the SGS manual of linear integrated circuits of 1982. The circuit is based on the...
Found in a Popular Electronics from the 90s, this circuit is suitable for communication between rider...
Indicated as a joke or challenge this circuit shows how it is possible to control two lamps using...