This circuit acts on a relay disconnecting the load when the input voltage exceeds the set limit. The transformer is 12 V secondary according to the relay used.
This circuit was found at Electronics Now. It can be used as a shield detector for dial signals in an...
This circuit changes the wave shape of a square signal according the values of C1 and R1. Other...
The circuit shown is from the 1994 Linear Applications Handbook by National Semiconductor. Other...