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OK, I think that I understand.
The board can be populated at one spot with either a 12v output DC-DC for mosfet drive, or a 15v module for IGBT driver.
The second spot is for a 5v output module in each case.
For testing, I sometimes use old laptop/TV powerpack/charger modules.
They are mostly quite well isolated, but one has to check to be certain.
Just be careful with cell phone chargers as they more commonly lack full isolation.
Sometimes they are big and ugly, but allow testing and further refining to continue until you can get the proper module.
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