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    Circuit to control laser diode by an Arduino

    Hey all, I've been lurking for a few weeks but this is my first post so go easy on me :) I'd like to use an Arduino (uno) and an optocoupler to TTL/PWM switch a ir LD (808 nm, 280 mA) which gets a constant current from an LM317. From my lurking here (thanks folks for all the excellent info)...




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