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, found in a 1994 documentation, uses 20 A 2N5448 triacs or equivalent and should be...
This conventional power supply circuit with the LM317 was found in a 1987 publication and its...
This automotive circuit was obtained from an 80's schematic from the integrated circuit factory...