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 is a traditional configuration with the 741 Operational Amplifier and its gain is...
This simple digital frequency meter using CMOS circuits reaches 5 MHz frequency. Input signals are...
In this circuit of an American publication of 1978, the integrated circuit may be the 4001 and the...