In fact, it is a night light system that automatically turns on the outside lights when it gets dark and turns them off at dawn. The circuit only applies to incandescent lamps.
The integrated circuit used in this project is not common today, but it can be implemented with more...
Found in an American publication from 1969, this circuit can be adapted to be used as a shield....
This current meter with many scales was found in a 80s American documentation. The operational amplifier...