Switches that auto-detect if there's something attached to one side

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i'm looking double-throw "switch" (or switching circuit) determines side gets power based on if connected.  common example of in consumer electronics stereo systems (and iphones, etc) default play on exterior speakers unless plugged headphone jack.

i expect there's existing chip or device can buy this, have no idea search for.  alternately if can reasonably built (i imagine there's way transistors, diodes, , double throw relay) work.

i'd using switch 12v dc system has reasonably high maximum amperage (somewhere around 30a).

in case of audio input switch in jack socket detecting. there no chip.


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