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Basic Light Emitting Diode guide - DP
Light-Emitting Diodes (LEDs) - learn.sparkfun.com
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Light-Emitting Diodes (LEDs) - learn.sparkfun.com
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If it is recommended to use 20mA with my LEDs, what would happen if I use 30mA or even 40mA? - Quora
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Light-Emitting Diodes (LEDs) - learn.sparkfun.com
