batteries - 9V powering to the safest maximum brightness of 4 IR LEDs in series - Electrical Engineering Stack Exchange
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uxcell 30pcs 5mm 940nm Infrared Receiver Diode DC1.2-1.3V LED IR Receiver Light Emitting Diodes Black Round Head: Amazon.com: Industrial & Scientific
LED as Zener diode. Design Note 37 – Hobby Projects
Light-Emitting Diodes (LEDs) - SparkFun Learn
Gikfun 5mm 940nm LEDs Infrared Emitter and IR Receiver Diode for Arduino (Pack of 20pcs) EK8443
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![Super-bright 5mm IR LED [940nm] : ID 387 : $0.75 : Adafruit Industries, Unique & fun DIY electronics and kits](http://www.adafruit.com/images/480x360/387-01.jpg "Super-bright 5mm IR LED [940nm] : ID 387 : $0.75 : Adafruit Industries, Unique & fun DIY electronics and kits")
Super-bright 5mm IR LED [940nm] : ID 387 : $0.75 : Adafruit Industries, Unique & fun DIY electronics and kits
5mm LED - Infrared 850nm 50 Degree Viewing Angle
The application of infrared LED - LEDinside
TIDA-010014 reference design | TI.com
Infrared 850 nm IR LED Strip Light – Waveform Lighting
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infrared - Understanding voltage and current of a phototransistor w/ collector resistor - Electrical Engineering Stack Exchange
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