This circuit was found in a 1967 US documentation. The circuit applies to modern general purpose transistors. The circuit has no offset. The power supply must be symmetrical.
This detector is from the 1990 Motorola Dataar Databook, but can be adapted to work with more...
The operational amplifier used in this circuit from a documentation from the 70s is no longer easy...
This configuration can be found in other articles in this section. This was obtained in a 2000...