His solution makes it extra cheap by using so-called passive PoE ... It’s also ridiculously cheap, with a PoE injector adapter (RJ-45 plug & 2.1×5.5 mm power jack to RJ-45 jack) going for ...
See one power-over-Ethernet product and you’ve seen ‘em all, right? Not quite. Here is a Tycon Passive PoE injector teardown.
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