We obtained this circuit in a Maxim documentation from the 90s. The circuit is based on the MAX627. This circuit provides an output voltage of 12 V from an input of 4.5 to 12 V.
Found in American documentation from 1969, this circuit switches signals with a FET of the time....
This 741 operational circuit can be found with slight variations in this section and on this site....
September 2017 - Mouser Electronics already has the AP431S adjustable regulator from Diodes...