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

Yep, that's a bit much for a guy who had trouble turning on a LED..hehhe. So I should use the 1k resistor going into the 2n3904.  If I'm using the SX Tech board and the Vdd, would ok?  The LED's say the forward voltage is 3.0-3.2v.  I'm just started to get into electronics and don't have a clue on how to calculate the proper voltage.

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