This circuit appears on this site from different sources. This is from documentation from the 1980s. The operating system used is uncommon and can be replaced by a more modern equivalent.
November 2016 - Texas Instruments' new ISO773x triple channel digital isolators with 5,000 V...
This FET stage circuit was obtained from old American documentation but can be applied to any FET....
We found this circuit in documentation from Linear Technology of the 80s. The circuit uses...