This circuit was suggested by Motorola in a 1969 publication. It makes use of components of the time, but both the FET and the bipolar may be general purpose current types.
This circuit was found in an American 80's documentation. The transistor is of germanium of the...
The circuit shown in the figure was found in a 1977 documentation, which can provide a good gain...
The circuit is from the Texas Instruments component datasheet. With it currents up to 2.7 A can be...