Step 4Solder the Cathodes
Not much to say here just solder the 4 rows & make sure to avoid any bridges in the wires. You should have 4 rows that have only 3 connections to it, one from each group with one group not attached. I tried to make the schematic as close to the wiring as possible, so that might make what I'm talking about a little easier to understand. It's is the last picture on this step.
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