This an old commercial receiver found in a year 1958 magazine. The circuit uses some transformer available that timer and the transistors are germanium types. The circuit is intended to receive MW stations.
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...