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 was found in the July 1994 issue of Electronics Now magazine. The relay can be rated...
This circuit appeared in the September 1973 issue of Radio Electronics magazine and was...
This circuit is from a Radio Electronics from March 1970. The integrated circuit used is one of...