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.
In the figure we have a stereo decoder from the 70's with pilot lamp for signal indication. The...
This circuit was found in an Elektor from the 90s. It makes use of digital CMOS integrated devices...
We found this mains-powered switch circuit in Electronics Now magazine from July 1994. It could be...