This is one of the channels of an amplifier suggested by Westinghouse in 1970s documentation. The circuit uses components from the era and no information about the transformer is given.
Found in American documentation from the 1980s, this circuit makes use of components of the time,...
This circuit blocks 60 Hz signals and can be used in filters for audio equipment. The operational...
This circuit is from 1983 documentation. The author shows us an experimental circuit of a siren...