This automotive circuit was obtained from an 80's schematic from the integrated circuit factory itself. The voltage regulator is still common, but the operational amplifier is of the time.
This circuit was found in the Spanish magazine that no more existis Mundo Electrónico, in a...
A high level on the input of this circuit causes the trim voltage adjusted output voltage to drop to 1.2...
This circuit is from old documentation, but the regulator may be 78xx series equivalent and the...