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I soldered in a 20 amp diode(20A10) as a reverse shunt; it's what I had laying around.? Note that the markings on the sBitx circuit board where the power comes in are reversed.? That plus sign on the board should be a negative.? I know the solder job looks bad but I did put a lot of heat to it.? I just couldn't get it shiny.? What is good about this diode is it can trip the circuit breaker on my 20 amp Astron before I even turn the sBitx power on.? I still went ahead and added a 10 amp blade fuse to the external power pigtail for extra protection.
AE9J