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From the post:

>In his regular browsing on AliExpress, [Ben Jeffrey] came across something he didn’t understand—a $5 fiber optic to RF cable TV adapter. It was excessively cheap, and even more mysteriously, this thing didn’t even need power. He had to know how it worked, so he bought one and got down to tinkering with it.

Archive: https://archive.today/9cATU From the post: >>In his regular browsing on AliExpress, [Ben Jeffrey] came across something he didn’t understand—a $5 fiber optic to RF cable TV adapter. It was excessively cheap, and even more mysteriously, this thing didn’t even need power. He had to know how it worked, so he bought one and got down to tinkering with it.
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Would it be feasible to make an array of those photo diodes, maybe use mirrors to concentrate sun light, and generate free electricity? Possibly have that last a lot longer than a typical solar cell?