This circuit was found in documentation from the 1980s. It is powered by the audio signal that must be cut. Transformers are the critical components and transistors are 2N2222.
This circuit, found in a 1958 magazine, is for reference only, since the components are not easy...
We found this mains-powered switch circuit in Electronics Now magazine from July 1994. It could be...
This interesting and powerful circuit was found in a 2003 documentation. It supplies several tens...