This circuit is from an American 1967 documentation and can be implemented with modern equivalent transistors. The circuit serves as a Q multiplier.
July 2017 - Mouser Electronics announced the availability of its new ISO771x digital isolators...
April 2017 - TDK chip-on-ceramic components can be obtained from Mouser Electronics for 2.4 GHz...
The sensor component used in this project is not common today as it is an 80's design. The circuit...