This circuit was found in an ancient American documentation. The power supply is not given, but we have the voltages used. The relay is sensitive type for high voltage.
This circuit is from Motorola's 1990 Linear Databook. We can implement it with other operational...
August 2017 - Mouser Electronics already has to supply the new Darlington MAAM-011206 Broadband...
This proximity sensor circuit is from an 80's documentation. The used integrated circuits are...