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 with the operational amplifier CA3130 was found in a documentation from 1977. The...
This circuit was obtained from Electronics Now magazine, July 1995. The triac depends on the...
Suggested by Motorola in a 1992 documentation, this circuit works as a remote volume control,...