The presented circuit was found in the National Semiconductor FET Databook. The setting applies to other operational amplifiers and other FETs. The power supply must be symmetrical.
This electronic Morse Key for telegraph message transmission was found in an American 1980s...
This PWM control circuit was found in an old documentation, but appears elsewhere on this site...
Found in a 90s Radio Electronics, this circuit uses an AD590 or AD592 for remote temperature...