This small audio amplifier circuit in complementary symmetry was found in the 1974 Mullard Databook. The output pair can also be the BD135 and 136.
This circuit was found in a 1982 Maplin documentation. The configuration applies to almost any JFET....
This circuit is a sensor for photodiodes that can be used in optical couplers, encoders and other...
This circuit was found in an American publication from the 60's. The transistor is made of...