The 2N3819 is covered by this 26.3 KB PDF, a brief document that is catalogued as a schematic but expected to be a component datasheet. No maker or revision appears in the name. Technicians use it to confirm the pinout, which matters because lead order can differ between suppliers of the same number, and to read rated limits and characteristics when hunting for a substitute. Check the package and printed marking on the actual part before trusting the pin layout shown.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @cyberlanelectonik. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.