This receiver uses old transistors that are equivalent to BC548 and BC558. The photo diode is of any type. The receiver can be used on a highly sensitive audio link.
Other operational amplifiers of the same the series, such as the MC34072, MC34074, MC35071,...
This circuit is from documentation from 1965. However, it can be created with modern transistors. Power...
This two-transistor delay circuit from the 1960s was found in documentation from the time....