Infrared LED driver - constant current

Mario DeFacendis
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Constant current (emitter follower) circuit to driver an infrared LED. Good when power source is a battery.
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Infrared LED driver
Infrared LED driver

Mario DeFacendis

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Open Web Foundation Contributor License Agreement 1.0 / OWF-CLA 1.0

Published: November 8, 2013 Concept

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Component (6)
Qty
Description
2N2222A

Q1

1
2N2222
6.8 Ω Resistor

R2

1
22 Ω Resistor 1/4 W
QED222

D1

1
PLASTIC IR EMITTING DIODE 890nm
1N4148

D2, D3

2
1N4148 Diode

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