| http://www.w3.org/ns/prov#value | - In general, the brightness of light emitted from an LED is a function of the current flowing through the LED. Control circuit 900 controls the amount of current flowing through LED 902 by generating a pulse-width modulated signal 904 that is provided through a resistor 906 (e.g., 10 k??) to the base of a current-sourcing transistor 908.
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