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Build the IR Circuits | LEARN.PARALLAX.COM
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multimeter - How can I know if an IR LED (emitter) is working, other than using a smartphone camera? - Electrical Engineering Stack Exchange
Simplest Way to Test IR LED - Including IR Emitter and IR Receiver LED - Instructables
2PC ORDRO LN-3 Studio IR LED Light USB Port Infrared Illuminator for DSLR Camera | eBay
