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LED Resistor Value Calculator – Kitronik Ltd
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LED Resistor Calculator
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You Can Power a Calculator With Some LEDs | WIRED
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LED Driver Calculator - uPowerTek
LED resistor calculator for windows v1.0 (download) | electronicsblog.net
Amazon.com : LED Back-Light Calculator Desktop SMT-200 / Added Sound Function (White) : Office Products
File:Vintage Casio Biolator Pocket LED Calculator, Model H-801, Made in Japan, Circa 1975 (9273200144).jpg - Wikimedia Commons
