What’s the weirdest computer you can think of? This one’s weirder. [Dr. Cockroach] figured out a way to create an inverting NOT gate from just one LED and two resistors (one being a photo-resistor).
The circuit uses an IA2505 high-efficiency, low-cost, four-channel LED driver current source, designed for flash and backlighting LEDs. The circuit’s LED current can be set from 5 mA to 80 mA on each ...
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