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batteries - 9V powering to the safest maximum brightness of 4 IR LEDs in series - Electrical Engineering Stack Exchange
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Infrared LEDs
The specification of the IR LED (SFH 4544 Infrared Emitter 940 nm by... | Download Scientific Diagram
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IR Sensor | Basics, Types, Circuit, Working, Projects, FAQs
Driving an Infrared Led directly from an Arduino Pin
![Super-bright 5mm IR LED [940nm] : ID 387 : $0.75 : Adafruit Industries, Unique & fun DIY electronics and kits](https://cdn-shop.adafruit.com/970x728/387-01.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
The Forward Voltages of Different LEDs | CircuitBread
