This interesting circuit was found on the Internet and is based on the 555. The circuit uses power MOSFETs that determine its output. No information about the transformer was provided.
This simple circuit for headphones or small speakers was found in documentation from the 90s. The...
In the figure we have the way to implement a monostable with a comparator 139, 239 or 339. The...
This circuit was obtained from a 1977 documentation. The circuit does not require a symmetrical power...