Found in American documentation from 1969, this circuit switches signals with a FET of the time. The circuit can be implemented with modern equivalent transistors.
This circuit was obtained from a 1968 documentation and can be adapted to use current equivalent...
Two tone siren (CB9085E) This circuit was found in a 1980’s Radio Electronics. The signal must be...
This circuit, from the 1990 Motorola Dataar Databook, can use any LM139 series comparator. The circuit...