In SX Microcontrollers, SX/B Compiler and SX-Key Tool, JonnyMac wrote:

I would suggest the circuit above which does saturate the transistor -- that way you can turn the LEDs full on or dim them with any number of PWM techniques.  Use a 1K series resistor and a 2N3904 and you'll be set.  Select the current limiters based on the LED forward voltage plus about 0.3v for Vce.

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