The circuit is from 80s Siliconix documentation. The integrated circuit is from the company and is not common today. It can be used operational equivalent more common in our times.
This circuit was found in an American 80's documentation. The operational may be a modern type...
This circuit was found in a French magazine Toute LÉlectronique from 1978. Transistors are not...
This is basically the same circuit as the previous one, but using PNP transistors. In the original...