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AV selector box

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i want to build an audio/video selector box. one that has like 5 inputs for audio and video and then all route to one output of audio and visual.

that way i can connect all of my components to the selector box and just push switches to use the different components. ive seen these around for about 20 bucks, i was wondering if i could build one for cheaper.

is it really as easy as connecting RCA connectors together with switches to inturrupt the flow?
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