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kentken said:Bellow is my Sch of my project.
Are the 2n3904 the best choise?
Is there a array that would work better?
What is the lowest value for the display resistors?(max brightness)
kentken said:Nigel, Do I really need the ULN2003 to sink the current, or will the Pic handle it?
I would suggest PNP transistors would be a far better bet, with emitters to +ve, and resistors in series with the bases. This would give you more voltage to the displays (approaching 20% more) - you would need to alter your code to make them active low, rather than active high.
kentken said:So,
3v/100ma=30 ohm
3v/150ma=20 ohm
Is this right?
kentken said:Below is a layout with PNP's. If this is the way to go, please take a look.
What should the values on the R2's and the R1's be?