This circuit is from the Motorola Linear Databook of 1990 and can be implemented with other operational amplifiers. The power supply must be symmetrical.
This circuit was found in an English magazine Radio & Electronics Constructor of February 1977....
This circuit is from a 1976 documentation. The diodes can be 1N34 or equivalent, and the power...
This circuit is from a Maxim manual and can be used to power shields from batteries. The circuit...