I would use what Maxim suggest for the displays and would not bother with mods to drive common anodes.
As for the capacitance, well, few centimeters more will not do an harm. Do not worry about that. A 20 meter or more sure is of concern.
Ioannis
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Re: HW-179 8-Digit 7-Segment LED Display (MAX7219 Driver)
I would use what Maxim suggest for the displays and would not bother with mods to drive common anodes.
As for the capacitance, well, few centimeters more will not do an harm. Do not worry about that. A 20 meter or more sure is of concern.
Ioannis
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