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.
The circuit below is found in the manuals of several manufacturers in the LM123 series of...
The integrated circuit used in this 70's project is unusual, being the critical element of an...
We found this circuit in Radio Electronics magazine from May 1967. The circuit has the tuned...