This circuit, for frequencies up to 100 kHz, was found in American documentation from 1970. The circuit can serve as a reference for projects with modern equivalent components.
We found this automotive alarm circuit in a 90's Popular Electronics circuit. The circuit emits a...
This is one of the many applications of the 555. We found it in the November 1992 Radio...
This circuit is from an American 1967 documentation and can be implemented with modern equivalent...