Found in an American documentation from the 90s, this circuit has a configuration that has been extensively explored in other articles on this site. The FET can be the MPF102 or equivalent.
This circuit has already been presented from other manufacturers' manuals. This one, specifically, is from...
Other settings like this can be found on this website. This makes use of old operational...
This simple 555 component tester was found in the November 1992 issue of Radio Electronics...