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 is from a 1966 American documentation. The circuit uses a photo-FET, an unusual...
We found this circuit in documentation from the 1970s; The circuit uses Japanese transistors of...
The 4028 CMOS IC not only contains the complete decade counter, but also the 7-segment decoder...