The circuit shown has a voltage gain of 500 times and can use equivalent FETs like the BF245. The circuit is suggested by National Semiconductor in its 1994 Linear Applications Handbook.
Using an operational that is not common today, but which admits a modern equivalent, we found this...
This precision full-wave rectifier used in instrumentation was found in a technical documentation from the...
The integrated circuit used in this project is unusual and it includes internal transistors that...