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Circuit with 2 power source

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find_beat

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I have a circuit that can be powered by 2 different power source.

1. Using Apple Lightning Cable
2. Using a micro USB cable

Only 1 suppose to be plug in at a time. What component/circuit design can I use to prevent someone from plugging 2 source at the same time?

Thanks
 
Use a relay. That would make it easy to make it a master/slave supply (only when master supply is dead/turned off, the slave supply is allowed to connect)
 
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