Matching brightness across multiple 7-seg LED displays

Steve · 2004-10-06T15:15:57+00:00

I'm driving three 7-seg LED displays from a PIC by mulitplexing them -actually "Charlieplexing":I've got a few of these boards and in some cases one or two of the 7-segdisplays are clearly brighter/duller than the others. Is this an issue withthe display ICs (all the same type), the 2N3704 transistors (all the sametype) that I use, or something else? FWIW, within each display IC, thebrightness of each segment is the same. I know it's not the resistors sinceI they reside on a different PCB that connects to this display, and so thesame resistors are used everytime.Many thanks,Steve

Oct 06, 2004 20 Replies

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Steve 21 years ago

simply

driving

one

Very nice, thanks!

Steve

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Matching brightness across multiple 7-seg LED displays

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