This integrated amplifier was used in televisions from the 70s, with good sensitivity characteristics. The circuit was powered with 9 V.
This circuit was found in a 1967 US documentation. The FET is general purpose and the 6V zener....
This High Side Current Sensor was found in a 2005 Linear Technology manual. The current sensing...
Found in American documentation from the 90's, this circuit is very current and can be implemented with...