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.
We found this circuit in the 1994 National Semiconductor Linear Applications Handbook. The circuit is...
This circuit is from an American manual from 1974. It uses a diac (Q1) and the SCR can be the...
This semi-proportional temperature control was found in old American documentation. The components are...