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Constant current infrared LED emitter circuit

Recently, we have been asked several times about driver circuits for IR LEDs, particularly with good range and coverage. Most of us start off driving infrared leds directly from an Arduino or other MCU using a basic resistor in series with the LED connected to a digital output pin of the MCU.

IRsignaltraceRectifierDiodeIN4148
An oscilloscope snalpshot showing a trace of Ve from the constant current circuit shown below.

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