Build the IR Circuits | LEARN.PARALLAX.COM
infrared - Understanding voltage and current of a phototransistor w/ collector resistor - Electrical Engineering Stack Exchange
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Extend IR Led Range - Raspberry Pi Forums
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Driving an IR LED: constant current source or not – Arduino, ESP8266, ESP32 & Raspberry Pi stuff
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IR Emitter LED 940nm 5mm (5-Pack) - ProtoSupplies
Infrared 830nm 20mW Focusable Line Laser Diode Module IR LED Driver 3-5V | eBay
How to control IR led using ESP8266 (out pint at 3.3v) and MOSFET to obtain high IR range? - Electrical Engineering Stack Exchange
Infrared LEDs
