| 摘要 |
Electrical appliances, particularly A.C. operated appliances, are turned on and off from remote locations by shining a beam of light, using a flashlight or the like on a photoelectric transducer/semiconductor switching device interconnected between a power line and the appliance, the switching device being bi-stable, activatable for either switch-on or switch-off operations by a signal from a single photoelectric transducer, and further comprises delay means responsive to the occurrence of a switch-on or switch-off operation to prevent a subsequent switching operation until a number of seconds have elapsed to allow for variations of human response in handling of the activating light beam, thereby preventing on and off chattering.
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