| 摘要 |
<p>The present invention relates to a back-up system for the supply of electric voltage in television systems to main and secondary amplifiers in case of electric faults by way of switching means, e.g. a relay, triak, a transistor, etc. Said switching means are automatically actuated when an electric fault occurs causing change of direction. The switching means are advantageously located within the trunk and connected to an in/out supply socket or other suitable means. Several systems for the connection of the switching means to the electric source are described <IMAGE></p> |
