The circuit in the figure uses two operational amplifiers: an LM101A and an LM102. Diodes admit equivalents and resistors do not have to be accurate. The power supply must be symmetrical.
We found this circuit in a 1965 General Electric manual. The circuit applies to incandescent lamps only and...
This simple circuit was obtained in a Portuguese publication in 1979 but can be easily assembled with...
In fact, it is a night light system that automatically turns on the outside lights when it gets...