Video Activated Relay Circuit

If you want the tuner you need to build the tuner by yourself ? The relay contactor output was connecting to electronic circuit by under control. What is that mean? Can You directly connect the relay to a socket ? and the TV can straight away plug in to the socket? For the electronic circuit diagram which is only DC voltage , but i think the tv need AC , Yes?So,do you need to put a transfomer ?
Tag : Relay
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