DC Phantom
Simple DC signalling can be achieved on a telecommunications line in a similar way to phantom powering of microphones. A switch connected to the transformer centre-tap at one end of the line can operate a similarly connected relay at the other end. The return path is through the ground connection. This arrangement can be used for remotely controlling equipment.
Read more about this topic: Phantom Circuit
Famous quotes containing the word phantom:
“Art has a double face, of expression and illusion, just like science has a double face: the reality of error and the phantom of truth.”
—René Daumal (1908–1944)
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