This high quality circuit with complementary symmetry was found in an Electronics World of 1966. It can be made with modern transistors like the BD or TIP series.
This detector is from the 1990 Motorola Dataar Databook, but can be adapted to work with more...
S1 changes the selection of the input signals in the circuit shown here. Other type of circuits,...
This High Side Current Sensor was found in a 2005 Linear Technology manual. The current sensing...