Device controller and control arrangement

摘要

A controller 1 and a control arrangement are disclosed in which the controller 1 serves to intermittently interrupt an AC supply to a device 7 thereby to encode a control signal in the supply. A detector 5 receives the AC supply, decodes the control signal and controls the device 7 in dependence thereupon. Hence only the AC supply lines are needed to supply both power and the control signal. The device may in particular be an aircraft light.