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Not for nothing, what is that schematic from? Does anyone remember their highschool analog electronics? That is about as basic as a differential amplifier gets, like page 4 in any electronics 101 type book. Also - isn't this what A1ex of Magic Lantern / CHDK fame did with Canons back in '13...

You should have bought more, because today you're not getting that for "shouldn't cost more than $15" in late 2019 with a Chinese trade tariff war going on. Hmm. Here. It's twice what you want to pay for it: $29.99 https://www.amazon.com/Magnetic-Round-Flash-Light-Accessories/dp/B07SLL6147...