this is a really helpful thread, although im struggling to get my head around what the different chip are that have been used. like you i have used a max 7219 chip and have got the prototyping board all sorted out using 2 or 3 smaller seven segments. Now im trying to move onto the larger displays and they are not bright enough. What were the chips that you have used to allow for a greater voltage to power the display? any help would be greatly appreciated. cheers
I just finished building this out and noticed a couple of issues/items. See attached for image of layout marked up with notes1) I needed a pull-up resistor (array) between the max7219 SEGs and 2981. Without this it didn't work at all. I
2) The cathode 2803 (bottom right in your pic) I had to plug it's ground into the +15v ground. Using the +5 ground (from the arduino) didn't work
3) iset for the 7219 doesn't seem to do anything. I can run all of this without even a resistor in there
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