This circuit is from 1964 documentation but can be easily implemented based on current components. Input waveforms and detection are shown next to the diagram.
The New Microchip development board is targeted to designers who work with 16- and 32-bit PICs....
Found a documentation on PCs from 1996, this circuit can be used as a shield. The relay is rated at...
This circuit is from a Japanese magazine of 1973. The circuit is designed to withdraw the power...