This classic windscreen wiper interval setup was found in American documentation from the 90s. The circuit can be found with variations at other points on this site.
This simple megaphone is from old documentation, but uses still current components. The circuit is...
The circuit used is the 4093 configured as an inverter in this application from Radio Electronics from...
This AC motor driver circuit was found in Motorola's 1968 documentation. No information was given...