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电视机采用室外天线时,都应安装避雷器,遇雷雨天气还要停止收看并将电视天线接地。一旦疏忽或家中无人时,如没有采取接地措施就可能造成事故。为此,我采用如图所示的电气线路,实现了自动转换。当打开电视机时,继电器J动作(我采用12VJRX-13F-C型),电视机室外天线经继电器常开触点接到电视机外接天线插口,实现了正常收看。当看完电视关机后,继电器失电释放,电视机室外天线经继电器常闭触点直接接地,常开触电断开了电视机外接天线插口。实现了自动切换,在大雷雨或无人在家时,自动保护了电视机。注意事项:
TV outdoor antenna, the arrester should be installed in case of thunderstorms, but also to stop watching and television antenna ground. In the event of negligence or no one in the house, an accident may result if the earthing measures are not taken. To this end, I use the electrical circuit as shown, to achieve automatic conversion. When turning on the TV, the relay J action (I use 12VJRX-13F-C type), TV outdoor antenna through the relay normally open contact to the TV external antenna jack, to achieve the normal viewing. When watching the TV off, the relay is discharged, the TV outdoor antenna directly connected to the ground by the relay normally closed contacts, normally open the power to disconnect the TV antenna jack. Automatic switching is achieved, automatically protecting the TV during heavy thunderstorms or unattended home. Precautions: