This precision reference circuit was found in documentation from the 1980s. It applies to other operational amplifiers. The power supply must be symmetrical.
This circuit from the 80's makes use of two transconductance operationals of the time. Modern...
This circuit was obtained in a documentation from the National Bureau of Standards of 1968. The...
In the figure we have a diagram of a thermostat using an NTC and an operational amplifier 741. The...