This circuit was found in documentation from the 90s. The operational amplifier is NE5514, which is uncommon today. The configuration can be adapted to use modern components.
This Motorola circuit uses only one transistor. The circuit is from 1965 documentation. The...
This circuit was found in an English publication from 1989. The integrated circuits are of the...
This circuit can be used in bridge of sensitive measures. We found it in a documentation from the...