bountyhunter
Well-Known Member
I remember a specific failure mode on the "floating" 317 circuits with HV involved. There's usually some capacitors some where and at turn on they can force too much voltage across the LM317. Remember having this argument with the marketing idiots at NSC. I wanted to take the "HV floating" apps off the data sheet but nobody ever listened.Actually I think I have found a partial answer - a floating LM317 regulator with a zener between it's input and output