This circuit switches off a load in case of excess current acting as a fuse. The circuit is from a Radio Electronics from January 1965.
This conventional window comparator configuration was found in an old documentation. It is valid...
This sonic relay or vox was found in a Popular Electronics from the 90's. The power MOSFET can be of...
This high voltage circuit was found in a 1970 documentation. The integrated one is of the time and...