Hi there,
recently I am studying on the art of electronics (3rd edition), just to expand my knowledge (I usually use the book as a reference when I have a specific problem to solve).
Anyway I see that on the FET chapter, around 30 pages are dedicated specifically to JFET and circuits regarding them. Perhaps I'm too much a noob, but when I think about FETs I most certainly do not think of JFETs, and also it seems to me that JFETs are not used that much as discrete components, especially when compared to the past (this opinion derives from reading here and there on the internet).
So my question is: are all of these circuits really useful to learn or study? Do they have a specific didactic purpose?
Thanks!