This is the circuit of an automotive voltage regulator from the 1970s. The circuit is entirely electromechanical based on the closing of a relay contacts according to the voltage.
The integrated circuit used in this application is not currently common and the sensor can be any...
This regulator for switching sources up to 3 A was suggested by the Linear Applications Handbook of...
This filter was found in Exar documentation from the 1980s. The circuit has an attenuation of 60 dB at the...