My Aithre EX3.0 needs 5V supply voltage. I am not sure how to supply this. I have done some basic research and found resistors and zener diodes used as step down converters in low current applications, but, with my limited electrical skills (read, none) I don't feel comfortable doing custom wiring unless it is tried an true. There are little step down converters available, but, again, how reliable are these coming from Amazon and Walmart? Obviously outside my comfort zone.