Bipolar transistors are types of general use like BC548, while the power MOSFET can be of any type depending on the current and voltage in the load. The circuit is from old documentation.
.
This circuit was found in a Popular Electronics of the 1990s. Its purpose is to expand the scale of...
This circuit can be used as an input shield by removing the signal directly from the second port,...
In figures 1 and 2 we have two current drains that can be made with operational amplifiers and...